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libvirt/tools/virsh.c
Jiri Denemark a4743860f8 virsh: Remove bogus stat on log file 
Let's just open the file right away and deal with errors. Moreover,
there's no reason to forbid logging to, e.g., a pipe.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
2014-06-26 00:43:38 +02:00

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/*
* virsh.c: a shell to exercise the libvirt API
*
* Copyright (C) 2005, 2007-2014 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*
* Daniel Veillard <veillard@redhat.com>
* Karel Zak <kzak@redhat.com>
* Daniel P. Berrange <berrange@redhat.com>
*/
#include <config.h>
#include "virsh.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#include <getopt.h>
#include <sys/time.h>
#include "c-ctype.h"
#include <fcntl.h>
#include <locale.h>
#include <time.h>
#include <limits.h>
#include <sys/stat.h>
#include <inttypes.h>
#include <strings.h>
#include <signal.h>
#include <libxml/parser.h>
#include <libxml/tree.h>
#include <libxml/xpath.h>
#include <libxml/xmlsave.h>
#if WITH_READLINE
# include <readline/readline.h>
# include <readline/history.h>
#endif
#include "internal.h"
#include "virerror.h"
#include "base64.h"
#include "virbuffer.h"
#include "viralloc.h"
#include "virxml.h"
#include <libvirt/libvirt-qemu.h>
#include <libvirt/libvirt-lxc.h>
#include "virfile.h"
#include "configmake.h"
#include "virthread.h"
#include "vircommand.h"
#include "virkeycode.h"
#include "virnetdevbandwidth.h"
#include "virbitmap.h"
#include "conf/domain_conf.h"
#include "virtypedparam.h"
#include "virstring.h"
#include "virsh-console.h"
#include "virsh-domain.h"
#include "virsh-domain-monitor.h"
#include "virsh-host.h"
#include "virsh-interface.h"
#include "virsh-network.h"
#include "virsh-nodedev.h"
#include "virsh-nwfilter.h"
#include "virsh-pool.h"
#include "virsh-secret.h"
#include "virsh-snapshot.h"
#include "virsh-volume.h"
/* Gnulib doesn't guarantee SA_SIGINFO support. */
#ifndef SA_SIGINFO
# define SA_SIGINFO 0
#endif
static char *progname;
static const vshCmdGrp cmdGroups[];
/* Bypass header poison */
#undef strdup
void *
_vshMalloc(vshControl *ctl, size_t size, const char *filename, int line)
{
char *x;
if (VIR_ALLOC_N(x, size) == 0)
return x;
vshError(ctl, _("%s: %d: failed to allocate %d bytes"),
filename, line, (int) size);
exit(EXIT_FAILURE);
}
void *
_vshCalloc(vshControl *ctl, size_t nmemb, size_t size, const char *filename,
int line)
{
char *x;
if (!xalloc_oversized(nmemb, size) &&
VIR_ALLOC_N(x, nmemb * size) == 0)
return x;
vshError(ctl, _("%s: %d: failed to allocate %d bytes"),
filename, line, (int) (size*nmemb));
exit(EXIT_FAILURE);
}
char *
_vshStrdup(vshControl *ctl, const char *s, const char *filename, int line)
{
char *x;
if (VIR_STRDUP(x, s) >= 0)
return x;
vshError(ctl, _("%s: %d: failed to allocate %lu bytes"),
filename, line, (unsigned long)strlen(s));
exit(EXIT_FAILURE);
}
/* Poison the raw allocating identifiers in favor of our vsh variants. */
#define strdup use_vshStrdup_instead_of_strdup
int
vshNameSorter(const void *a, const void *b)
{
const char **sa = (const char**)a;
const char **sb = (const char**)b;
return vshStrcasecmp(*sa, *sb);
}
double
vshPrettyCapacity(unsigned long long val, const char **unit)
{
if (val < 1024) {
*unit = "B";
return (double)val;
} else if (val < (1024.0l * 1024.0l)) {
*unit = "KiB";
return (((double)val / 1024.0l));
} else if (val < (1024.0l * 1024.0l * 1024.0l)) {
*unit = "MiB";
return (double)val / (1024.0l * 1024.0l);
} else if (val < (1024.0l * 1024.0l * 1024.0l * 1024.0l)) {
*unit = "GiB";
return (double)val / (1024.0l * 1024.0l * 1024.0l);
} else {
*unit = "TiB";
return (double)val / (1024.0l * 1024.0l * 1024.0l * 1024.0l);
}
}
/*
* Convert the strings separated by ',' into array. The returned
* array is a NULL terminated string list. The caller has to free
* the array using virStringFreeList or a similar method.
*
* Returns the length of the filled array on success, or -1
* on error.
*/
int
vshStringToArray(const char *str,
char ***array)
{
char *str_copied = vshStrdup(NULL, str);
char *str_tok = NULL;
char *tmp;
unsigned int nstr_tokens = 0;
char **arr = NULL;
size_t len = strlen(str_copied);
/* tokenize the string from user and save its parts into an array */
nstr_tokens = 1;
/* count the delimiters, recognizing ,, as an escape for a
* literal comma */
str_tok = str_copied;
while ((str_tok = strchr(str_tok, ','))) {
if (str_tok[1] == ',')
str_tok++;
else
nstr_tokens++;
str_tok++;
}
/* reserve the NULL element at the end */
if (VIR_ALLOC_N(arr, nstr_tokens + 1) < 0) {
VIR_FREE(str_copied);
return -1;
}
/* tokenize the input string, while treating ,, as a literal comma */
nstr_tokens = 0;
tmp = str_tok = str_copied;
while ((tmp = strchr(tmp, ','))) {
if (tmp[1] == ',') {
memmove(&tmp[1], &tmp[2], len - (tmp - str_copied) - 2 + 1);
len--;
tmp++;
continue;
}
*tmp++ = '\0';
arr[nstr_tokens++] = vshStrdup(NULL, str_tok);
str_tok = tmp;
}
arr[nstr_tokens++] = vshStrdup(NULL, str_tok);
*array = arr;
VIR_FREE(str_copied);
return nstr_tokens;
}
virErrorPtr last_error;
/*
* Quieten libvirt until we're done with the command.
*/
static void
virshErrorHandler(void *unused ATTRIBUTE_UNUSED, virErrorPtr error)
{
virFreeError(last_error);
last_error = virSaveLastError();
if (virGetEnvAllowSUID("VIRSH_DEBUG") != NULL)
virDefaultErrorFunc(error);
}
/* Store a libvirt error that is from a helper API that doesn't raise errors
* so it doesn't get overwritten */
void
vshSaveLibvirtError(void)
{
virFreeError(last_error);
last_error = virSaveLastError();
}
/*
* Reset libvirt error on graceful fallback paths
*/
void
vshResetLibvirtError(void)
{
virFreeError(last_error);
last_error = NULL;
}
/*
* Report an error when a command finishes. This is better than before
* (when correct operation would report errors), but it has some
* problems: we lose the smarter formatting of virDefaultErrorFunc(),
* and it can become harder to debug problems, if errors get reported
* twice during one command. This case shouldn't really happen anyway,
* and it's IMHO a bug that libvirt does that sometimes.
*/
void
vshReportError(vshControl *ctl)
{
if (last_error == NULL) {
/* Calling directly into libvirt util functions won't trigger the
* error callback (which sets last_error), so check it ourselves.
*
* If the returned error has CODE_OK, this most likely means that
* no error was ever raised, so just ignore */
last_error = virSaveLastError();
if (!last_error || last_error->code == VIR_ERR_OK)
goto out;
}
if (last_error->code == VIR_ERR_OK) {
vshError(ctl, "%s", _("unknown error"));
goto out;
}
vshError(ctl, "%s", last_error->message);
out:
vshResetLibvirtError();
}
/*
* Detection of disconnections and automatic reconnection support
*/
static int disconnected = 0; /* we may have been disconnected */
/*
* vshCatchDisconnect:
*
* We get here when the connection was closed. We can't do much in the
* handler, just save the fact it was raised.
*/
static void
vshCatchDisconnect(virConnectPtr conn ATTRIBUTE_UNUSED,
int reason,
void *opaque ATTRIBUTE_UNUSED)
{
if (reason != VIR_CONNECT_CLOSE_REASON_CLIENT)
disconnected++;
}
/* Main Function which should be used for connecting.
* This function properly handles keepalive settings. */
virConnectPtr
vshConnect(vshControl *ctl, const char *uri, bool readonly)
{
virConnectPtr c = NULL;
int interval = 5; /* Default */
int count = 6; /* Default */
bool keepalive_forced = false;
if (ctl->keepalive_interval >= 0) {
interval = ctl->keepalive_interval;
keepalive_forced = true;
}
if (ctl->keepalive_count >= 0) {
count = ctl->keepalive_count;
keepalive_forced = true;
}
c = virConnectOpenAuth(uri, virConnectAuthPtrDefault,
readonly ? VIR_CONNECT_RO : 0);
if (!c)
return NULL;
if (interval > 0 &&
virConnectSetKeepAlive(c, interval, count) != 0) {
if (keepalive_forced) {
vshError(ctl, "%s",
_("Cannot setup keepalive on connection "
"as requested, disconnecting"));
virConnectClose(c);
return NULL;
}
vshDebug(ctl, VSH_ERR_INFO, "%s",
_("Failed to setup keepalive on connection\n"));
}
return c;
}
/*
* vshReconnect:
*
* Reconnect after a disconnect from libvirtd
*
*/
static void
vshReconnect(vshControl *ctl)
{
bool connected = false;
if (ctl->conn) {
int ret;
connected = true;
virConnectUnregisterCloseCallback(ctl->conn, vshCatchDisconnect);
ret = virConnectClose(ctl->conn);
if (ret < 0)
vshError(ctl, "%s", _("Failed to disconnect from the hypervisor"));
else if (ret > 0)
vshError(ctl, "%s", _("One or more references were leaked after "
"disconnect from the hypervisor"));
}
ctl->conn = vshConnect(ctl, ctl->name, ctl->readonly);
if (!ctl->conn) {
if (disconnected)
vshError(ctl, "%s", _("Failed to reconnect to the hypervisor"));
else
vshError(ctl, "%s", _("failed to connect to the hypervisor"));
} else {
if (virConnectRegisterCloseCallback(ctl->conn, vshCatchDisconnect,
NULL, NULL) < 0)
vshError(ctl, "%s", _("Unable to register disconnect callback"));
if (connected)
vshError(ctl, "%s", _("Reconnected to the hypervisor"));
}
disconnected = 0;
ctl->useGetInfo = false;
ctl->useSnapshotOld = false;
}
/*
* "connect" command
*/
static const vshCmdInfo info_connect[] = {
{.name = "help",
.data = N_("(re)connect to hypervisor")
},
{.name = "desc",
.data = N_("Connect to local hypervisor. This is built-in "
"command after shell start up.")
},
{.name = NULL}
};
static const vshCmdOptDef opts_connect[] = {
{.name = "name",
.type = VSH_OT_DATA,
.flags = VSH_OFLAG_EMPTY_OK,
.help = N_("hypervisor connection URI")
},
{.name = "readonly",
.type = VSH_OT_BOOL,
.help = N_("read-only connection")
},
{.name = NULL}
};
static bool
cmdConnect(vshControl *ctl, const vshCmd *cmd)
{
bool ro = vshCommandOptBool(cmd, "readonly");
const char *name = NULL;
if (ctl->conn) {
int ret;
virConnectUnregisterCloseCallback(ctl->conn, vshCatchDisconnect);
ret = virConnectClose(ctl->conn);
if (ret < 0)
vshError(ctl, "%s", _("Failed to disconnect from the hypervisor"));
else if (ret > 0)
vshError(ctl, "%s", _("One or more references were leaked after "
"disconnect from the hypervisor"));
ctl->conn = NULL;
}
VIR_FREE(ctl->name);
if (vshCommandOptStringReq(ctl, cmd, "name", &name) < 0)
return false;
ctl->name = vshStrdup(ctl, name);
ctl->useGetInfo = false;
ctl->useSnapshotOld = false;
ctl->readonly = ro;
ctl->conn = vshConnect(ctl, ctl->name, ctl->readonly);
if (!ctl->conn) {
vshError(ctl, "%s", _("Failed to connect to the hypervisor"));
return false;
}
if (virConnectRegisterCloseCallback(ctl->conn, vshCatchDisconnect,
NULL, NULL) < 0)
vshError(ctl, "%s", _("Unable to register disconnect callback"));
return true;
}
#ifndef WIN32
static void
vshPrintRaw(vshControl *ctl, ...)
{
va_list ap;
char *key;
va_start(ap, ctl);
while ((key = va_arg(ap, char *)) != NULL) {
vshPrint(ctl, "%s\r\n", key);
}
va_end(ap);
}
/**
* vshAskReedit:
* @msg: Question to ask user
*
* Ask user if he wants to return to previously
* edited file.
*
* Returns 'y' if he wants to
* 'f' if he forcibly wants to
* 'n' if he doesn't want to
* -1 on error
* 0 otherwise
*/
int
vshAskReedit(vshControl *ctl, const char *msg)
{
int c = -1;
if (!isatty(STDIN_FILENO))
return -1;
vshReportError(ctl);
if (vshTTYMakeRaw(ctl, false) < 0)
return -1;
while (true) {
/* TRANSLATORS: For now, we aren't using LC_MESSAGES, and the user
* choices really are limited to just 'y', 'n', 'f' and '?' */
vshPrint(ctl, "\r%s %s", msg, _("Try again? [y,n,f,?]:"));
c = c_tolower(getchar());
if (c == '?') {
vshPrintRaw(ctl,
"",
_("y - yes, start editor again"),
_("n - no, throw away my changes"),
_("f - force, try to redefine again"),
_("? - print this help"),
NULL);
continue;
} else if (c == 'y' || c == 'n' || c == 'f') {
break;
}
}
vshTTYRestore(ctl);
vshPrint(ctl, "\r\n");
return c;
}
#else /* WIN32 */
int
vshAskReedit(vshControl *ctl, const char *msg ATTRIBUTE_UNUSED)
{
vshDebug(ctl, VSH_ERR_WARNING, "%s", _("This function is not "
"supported on WIN32 platform"));
return 0;
}
#endif /* WIN32 */
int vshStreamSink(virStreamPtr st ATTRIBUTE_UNUSED,
const char *bytes, size_t nbytes, void *opaque)
{
int *fd = opaque;
return safewrite(*fd, bytes, nbytes);
}
/* ---------------
* Commands
* ---------------
*/
/*
* "help" command
*/
static const vshCmdInfo info_help[] = {
{.name = "help",
.data = N_("print help")
},
{.name = "desc",
.data = N_("Prints global help, command specific help, or help for a\n"
" group of related commands")
},
{.name = NULL}
};
static const vshCmdOptDef opts_help[] = {
{.name = "command",
.type = VSH_OT_DATA,
.help = N_("Prints global help, command specific help, or help for a group of related commands")
},
{.name = NULL}
};
static bool
cmdHelp(vshControl *ctl, const vshCmd *cmd)
{
const char *name = NULL;
if (vshCommandOptString(cmd, "command", &name) <= 0) {
const vshCmdGrp *grp;
const vshCmdDef *def;
vshPrint(ctl, "%s", _("Grouped commands:\n\n"));
for (grp = cmdGroups; grp->name; grp++) {
vshPrint(ctl, _(" %s (help keyword '%s'):\n"), grp->name,
grp->keyword);
for (def = grp->commands; def->name; def++) {
if (def->flags & VSH_CMD_FLAG_ALIAS)
continue;
vshPrint(ctl, " %-30s %s\n", def->name,
_(vshCmddefGetInfo(def, "help")));
}
vshPrint(ctl, "\n");
}
return true;
}
if (vshCmddefSearch(name)) {
return vshCmddefHelp(ctl, name);
} else if (vshCmdGrpSearch(name)) {
return vshCmdGrpHelp(ctl, name);
} else {
vshError(ctl, _("command or command group '%s' doesn't exist"), name);
return false;
}
}
/* Tree listing helpers. */
static int
vshTreePrintInternal(vshControl *ctl,
vshTreeLookup lookup,
void *opaque,
int num_devices,
int devid,
int lastdev,
bool root,
virBufferPtr indent)
{
size_t i;
int nextlastdev = -1;
int ret = -1;
const char *dev = (lookup)(devid, false, opaque);
if (virBufferError(indent))
goto cleanup;
/* Print this device, with indent if not at root */
vshPrint(ctl, "%s%s%s\n", virBufferCurrentContent(indent),
root ? "" : "+- ", dev);
/* Update indent to show '|' or ' ' for child devices */
if (!root) {
virBufferAddChar(indent, devid == lastdev ? ' ' : '|');
virBufferAddChar(indent, ' ');
if (virBufferError(indent))
goto cleanup;
}
/* Determine the index of the last child device */
for (i = 0; i < num_devices; i++) {
const char *parent = (lookup)(i, true, opaque);
if (parent && STREQ(parent, dev))
nextlastdev = i;
}
/* If there is a child device, then print another blank line */
if (nextlastdev != -1)
vshPrint(ctl, "%s |\n", virBufferCurrentContent(indent));
/* Finally print all children */
virBufferAddLit(indent, " ");
if (virBufferError(indent))
goto cleanup;
for (i = 0; i < num_devices; i++) {
const char *parent = (lookup)(i, true, opaque);
if (parent && STREQ(parent, dev) &&
vshTreePrintInternal(ctl, lookup, opaque,
num_devices, i, nextlastdev,
false, indent) < 0)
goto cleanup;
}
virBufferTrim(indent, " ", -1);
/* If there was no child device, and we're the last in
* a list of devices, then print another blank line */
if (nextlastdev == -1 && devid == lastdev)
vshPrint(ctl, "%s\n", virBufferCurrentContent(indent));
if (!root)
virBufferTrim(indent, NULL, 2);
ret = 0;
cleanup:
return ret;
}
int
vshTreePrint(vshControl *ctl, vshTreeLookup lookup, void *opaque,
int num_devices, int devid)
{
int ret;
virBuffer indent = VIR_BUFFER_INITIALIZER;
ret = vshTreePrintInternal(ctl, lookup, opaque, num_devices,
devid, devid, true, &indent);
if (ret < 0)
vshError(ctl, "%s", _("Failed to complete tree listing"));
virBufferFreeAndReset(&indent);
return ret;
}
/* Common code for the edit / net-edit / pool-edit functions which follow. */
char *
vshEditWriteToTempFile(vshControl *ctl, const char *doc)
{
char *ret;
const char *tmpdir;
int fd;
char ebuf[1024];
tmpdir = virGetEnvBlockSUID("TMPDIR");
if (!tmpdir) tmpdir = "/tmp";
if (virAsprintf(&ret, "%s/virshXXXXXX.xml", tmpdir) < 0) {
vshError(ctl, "%s", _("out of memory"));
return NULL;
}
fd = mkostemps(ret, 4, O_CLOEXEC);
if (fd == -1) {
vshError(ctl, _("mkostemps: failed to create temporary file: %s"),
virStrerror(errno, ebuf, sizeof(ebuf)));
VIR_FREE(ret);
return NULL;
}
if (safewrite(fd, doc, strlen(doc)) == -1) {
vshError(ctl, _("write: %s: failed to write to temporary file: %s"),
ret, virStrerror(errno, ebuf, sizeof(ebuf)));
VIR_FORCE_CLOSE(fd);
unlink(ret);
VIR_FREE(ret);
return NULL;
}
if (VIR_CLOSE(fd) < 0) {
vshError(ctl, _("close: %s: failed to write or close temporary file: %s"),
ret, virStrerror(errno, ebuf, sizeof(ebuf)));
unlink(ret);
VIR_FREE(ret);
return NULL;
}
/* Temporary filename: caller frees. */
return ret;
}
/* Characters permitted in $EDITOR environment variable and temp filename. */
#define ACCEPTED_CHARS \
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-/_.:@"
int
vshEditFile(vshControl *ctl, const char *filename)
{
const char *editor;
virCommandPtr cmd;
int ret = -1;
int outfd = STDOUT_FILENO;
int errfd = STDERR_FILENO;
editor = virGetEnvBlockSUID("VISUAL");
if (!editor)
editor = virGetEnvBlockSUID("EDITOR");
if (!editor)
editor = "vi"; /* could be cruel & default to ed(1) here */
/* Check that filename doesn't contain shell meta-characters, and
* if it does, refuse to run. Follow the Unix conventions for
* EDITOR: the user can intentionally specify command options, so
* we don't protect any shell metacharacters there. Lots more
* than virsh will misbehave if EDITOR has bogus contents (which
* is why sudo scrubs it by default). Conversely, if the editor
* is safe, we can run it directly rather than wasting a shell.
*/
if (strspn(editor, ACCEPTED_CHARS) != strlen(editor)) {
if (strspn(filename, ACCEPTED_CHARS) != strlen(filename)) {
vshError(ctl,
_("%s: temporary filename contains shell meta or other "
"unacceptable characters (is $TMPDIR wrong?)"),
filename);
return -1;
}
cmd = virCommandNewArgList("sh", "-c", NULL);
virCommandAddArgFormat(cmd, "%s %s", editor, filename);
} else {
cmd = virCommandNewArgList(editor, filename, NULL);
}
virCommandSetInputFD(cmd, STDIN_FILENO);
virCommandSetOutputFD(cmd, &outfd);
virCommandSetErrorFD(cmd, &errfd);
if (virCommandRunAsync(cmd, NULL) < 0 ||
virCommandWait(cmd, NULL) < 0) {
vshReportError(ctl);
goto cleanup;
}
ret = 0;
cleanup:
virCommandFree(cmd);
return ret;
}
char *
vshEditReadBackFile(vshControl *ctl, const char *filename)
{
char *ret;
char ebuf[1024];
if (virFileReadAll(filename, VSH_MAX_XML_FILE, &ret) == -1) {
vshError(ctl,
_("%s: failed to read temporary file: %s"),
filename, virStrerror(errno, ebuf, sizeof(ebuf)));
return NULL;
}
return ret;
}
/*
* "cd" command
*/
static const vshCmdInfo info_cd[] = {
{.name = "help",
.data = N_("change the current directory")
},
{.name = "desc",
.data = N_("Change the current directory.")
},
{.name = NULL}
};
static const vshCmdOptDef opts_cd[] = {
{.name = "dir",
.type = VSH_OT_DATA,
.help = N_("directory to switch to (default: home or else root)")
},
{.name = NULL}
};
static bool
cmdCd(vshControl *ctl, const vshCmd *cmd)
{
const char *dir = NULL;
char *dir_malloced = NULL;
bool ret = true;
char ebuf[1024];
if (!ctl->imode) {
vshError(ctl, "%s", _("cd: command valid only in interactive mode"));
return false;
}
if (vshCommandOptString(cmd, "dir", &dir) <= 0) {
dir = dir_malloced = virGetUserDirectory();
}
if (!dir)
dir = "/";
if (chdir(dir) == -1) {
vshError(ctl, _("cd: %s: %s"),
virStrerror(errno, ebuf, sizeof(ebuf)), dir);
ret = false;
}
VIR_FREE(dir_malloced);
return ret;
}
/*
* "pwd" command
*/
static const vshCmdInfo info_pwd[] = {
{.name = "help",
.data = N_("print the current directory")
},
{.name = "desc",
.data = N_("Print the current directory.")
},
{.name = NULL}
};
static bool
cmdPwd(vshControl *ctl, const vshCmd *cmd ATTRIBUTE_UNUSED)
{
char *cwd;
bool ret = true;
char ebuf[1024];
cwd = getcwd(NULL, 0);
if (!cwd) {
vshError(ctl, _("pwd: cannot get current directory: %s"),
virStrerror(errno, ebuf, sizeof(ebuf)));
ret = false;
} else {
vshPrint(ctl, _("%s\n"), cwd);
VIR_FREE(cwd);
}
return ret;
}
/*
* "echo" command
*/
static const vshCmdInfo info_echo[] = {
{.name = "help",
.data = N_("echo arguments")
},
{.name = "desc",
.data = N_("Echo back arguments, possibly with quoting.")
},
{.name = NULL}
};
static const vshCmdOptDef opts_echo[] = {
{.name = "shell",
.type = VSH_OT_BOOL,
.help = N_("escape for shell use")
},
{.name = "xml",
.type = VSH_OT_BOOL,
.help = N_("escape for XML use")
},
{.name = "str",
.type = VSH_OT_ALIAS,
.help = "string"
},
{.name = "hi",
.type = VSH_OT_ALIAS,
.help = "string=hello"
},
{.name = "string",
.type = VSH_OT_ARGV,
.help = N_("arguments to echo")
},
{.name = NULL}
};
/* Exists mainly for debugging virsh, but also handy for adding back
* quotes for later evaluation.
*/
static bool
cmdEcho(vshControl *ctl, const vshCmd *cmd)
{
bool shell = false;
bool xml = false;
int count = 0;
const vshCmdOpt *opt = NULL;
char *arg;
virBuffer buf = VIR_BUFFER_INITIALIZER;
if (vshCommandOptBool(cmd, "shell"))
shell = true;
if (vshCommandOptBool(cmd, "xml"))
xml = true;
while ((opt = vshCommandOptArgv(cmd, opt))) {
char *str;
virBuffer xmlbuf = VIR_BUFFER_INITIALIZER;
arg = opt->data;
if (count)
virBufferAddChar(&buf, ' ');
if (xml) {
virBufferEscapeString(&xmlbuf, "%s", arg);
if (virBufferError(&xmlbuf)) {
vshPrint(ctl, "%s", _("Failed to allocate XML buffer"));
return false;
}
str = virBufferContentAndReset(&xmlbuf);
} else {
str = vshStrdup(ctl, arg);
}
if (shell)
virBufferEscapeShell(&buf, str);
else
virBufferAdd(&buf, str, -1);
count++;
VIR_FREE(str);
}
if (virBufferError(&buf)) {
vshPrint(ctl, "%s", _("Failed to allocate XML buffer"));
return false;
}
arg = virBufferContentAndReset(&buf);
if (arg)
vshPrint(ctl, "%s", arg);
VIR_FREE(arg);
return true;
}
/*
* "quit" command
*/
static const vshCmdInfo info_quit[] = {
{.name = "help",
.data = N_("quit this interactive terminal")
},
{.name = "desc",
.data = ""
},
{.name = NULL}
};
static bool
cmdQuit(vshControl *ctl, const vshCmd *cmd ATTRIBUTE_UNUSED)
{
ctl->imode = false;
return true;
}
/* ---------------
* Utils for work with command definition
* ---------------
*/
const char *
vshCmddefGetInfo(const vshCmdDef * cmd, const char *name)
{
const vshCmdInfo *info;
for (info = cmd->info; info && info->name; info++) {
if (STREQ(info->name, name))
return info->data;
}
return NULL;
}
/* Validate that the options associated with cmd can be parsed. */
static int
vshCmddefOptParse(const vshCmdDef *cmd, uint32_t *opts_need_arg,
uint32_t *opts_required)
{
size_t i;
bool optional = false;
*opts_need_arg = 0;
*opts_required = 0;
if (!cmd->opts)
return 0;
for (i = 0; cmd->opts[i].name; i++) {
const vshCmdOptDef *opt = &cmd->opts[i];
if (i > 31)
return -1; /* too many options */
if (opt->type == VSH_OT_BOOL) {
if (opt->flags & VSH_OFLAG_REQ)
return -1; /* bool options can't be mandatory */
continue;
}
if (opt->type == VSH_OT_ALIAS) {
size_t j;
char *name = (char *)opt->help; /* cast away const */
char *p;
if (opt->flags || !opt->help)
return -1; /* alias options are tracked by the original name */
if ((p = strchr(name, '=')) &&
VIR_STRNDUP(name, name, p - name) < 0)
return -1;
for (j = i + 1; cmd->opts[j].name; j++) {
if (STREQ(name, cmd->opts[j].name) &&
cmd->opts[j].type != VSH_OT_ALIAS)
break;
}
if (name != opt->help) {
VIR_FREE(name);
/* If alias comes with value, replacement must not be bool */
if (cmd->opts[j].type == VSH_OT_BOOL)
return -1;
}
if (!cmd->opts[j].name)
return -1; /* alias option must map to a later option name */
continue;
}
if (opt->flags & VSH_OFLAG_REQ_OPT) {
if (opt->flags & VSH_OFLAG_REQ)
*opts_required |= 1 << i;
continue;
}
*opts_need_arg |= 1 << i;
if (opt->flags & VSH_OFLAG_REQ) {
if (optional)
return -1; /* mandatory options must be listed first */
*opts_required |= 1 << i;
} else {
optional = true;
}
if (opt->type == VSH_OT_ARGV && cmd->opts[i + 1].name)
return -1; /* argv option must be listed last */
}
return 0;
}
static vshCmdOptDef helpopt = {
.name = "help",
.type = VSH_OT_BOOL,
.help = N_("print help for this function")
};
static const vshCmdOptDef *
vshCmddefGetOption(vshControl *ctl, const vshCmdDef *cmd, const char *name,
uint32_t *opts_seen, int *opt_index, char **optstr)
{
size_t i;
const vshCmdOptDef *ret = NULL;
char *alias = NULL;
if (STREQ(name, helpopt.name)) {
return &helpopt;
}
for (i = 0; cmd->opts && cmd->opts[i].name; i++) {
const vshCmdOptDef *opt = &cmd->opts[i];
if (STREQ(opt->name, name)) {
if (opt->type == VSH_OT_ALIAS) {
char *value;
/* Two types of replacements:
opt->help = "string": straight replacement of name
opt->help = "string=value": treat boolean flag as
alias of option and its default value */
sa_assert(!alias);
if (VIR_STRDUP(alias, opt->help) < 0)
goto cleanup;
name = alias;
if ((value = strchr(name, '='))) {
*value = '\0';
if (*optstr) {
vshError(ctl, _("invalid '=' after option --%s"),
opt->name);
goto cleanup;
}
if (VIR_STRDUP(*optstr, value + 1) < 0)
goto cleanup;
}
continue;
}
if ((*opts_seen & (1 << i)) && opt->type != VSH_OT_ARGV) {
vshError(ctl, _("option --%s already seen"), name);
goto cleanup;
}
*opts_seen |= 1 << i;
*opt_index = i;
ret = opt;
goto cleanup;
}
}
if (STRNEQ(cmd->name, "help")) {
vshError(ctl, _("command '%s' doesn't support option --%s"),
cmd->name, name);
}
cleanup:
VIR_FREE(alias);
return ret;
}
static const vshCmdOptDef *
vshCmddefGetData(const vshCmdDef *cmd, uint32_t *opts_need_arg,
uint32_t *opts_seen)
{
size_t i;
const vshCmdOptDef *opt;
if (!*opts_need_arg)
return NULL;
/* Grab least-significant set bit */
i = ffs(*opts_need_arg) - 1;
opt = &cmd->opts[i];
if (opt->type != VSH_OT_ARGV)
*opts_need_arg &= ~(1 << i);
*opts_seen |= 1 << i;
return opt;
}
/*
* Checks for required options
*/
static int
vshCommandCheckOpts(vshControl *ctl, const vshCmd *cmd, uint32_t opts_required,
uint32_t opts_seen)
{
const vshCmdDef *def = cmd->def;
size_t i;
opts_required &= ~opts_seen;
if (!opts_required)
return 0;
for (i = 0; def->opts[i].name; i++) {
if (opts_required & (1 << i)) {
const vshCmdOptDef *opt = &def->opts[i];
vshError(ctl,
opt->type == VSH_OT_DATA || opt->type == VSH_OT_ARGV ?
_("command '%s' requires <%s> option") :
_("command '%s' requires --%s option"),
def->name, opt->name);
}
}
return -1;
}
const vshCmdDef *
vshCmddefSearch(const char *cmdname)
{
const vshCmdGrp *g;
const vshCmdDef *c;
for (g = cmdGroups; g->name; g++) {
for (c = g->commands; c->name; c++) {
if (STREQ(c->name, cmdname))
return c;
}
}
return NULL;
}
const vshCmdGrp *
vshCmdGrpSearch(const char *grpname)
{
const vshCmdGrp *g;
for (g = cmdGroups; g->name; g++) {
if (STREQ(g->name, grpname) || STREQ(g->keyword, grpname))
return g;
}
return NULL;
}
bool
vshCmdGrpHelp(vshControl *ctl, const char *grpname)
{
const vshCmdGrp *grp = vshCmdGrpSearch(grpname);
const vshCmdDef *cmd = NULL;
if (!grp) {
vshError(ctl, _("command group '%s' doesn't exist"), grpname);
return false;
} else {
vshPrint(ctl, _(" %s (help keyword '%s'):\n"), grp->name,
grp->keyword);
for (cmd = grp->commands; cmd->name; cmd++) {
if (cmd->flags & VSH_CMD_FLAG_ALIAS)
continue;
vshPrint(ctl, " %-30s %s\n", cmd->name,
_(vshCmddefGetInfo(cmd, "help")));
}
}
return true;
}
bool
vshCmddefHelp(vshControl *ctl, const char *cmdname)
{
const vshCmdDef *def = vshCmddefSearch(cmdname);
if (!def) {
vshError(ctl, _("command '%s' doesn't exist"), cmdname);
return false;
} else {
/* Don't translate desc if it is "". */
const char *desc = vshCmddefGetInfo(def, "desc");
const char *help = _(vshCmddefGetInfo(def, "help"));
char buf[256];
uint32_t opts_need_arg;
uint32_t opts_required;
bool shortopt = false; /* true if 'arg' works instead of '--opt arg' */
if (vshCmddefOptParse(def, &opts_need_arg, &opts_required)) {
vshError(ctl, _("internal error: bad options in command: '%s'"),
def->name);
return false;
}
fputs(_(" NAME\n"), stdout);
fprintf(stdout, " %s - %s\n", def->name, help);
fputs(_("\n SYNOPSIS\n"), stdout);
fprintf(stdout, " %s", def->name);
if (def->opts) {
const vshCmdOptDef *opt;
for (opt = def->opts; opt->name; opt++) {
const char *fmt = "%s";
switch (opt->type) {
case VSH_OT_BOOL:
fmt = "[--%s]";
break;
case VSH_OT_INT:
/* xgettext:c-format */
fmt = ((opt->flags & VSH_OFLAG_REQ) ? "<%s>"
: _("[--%s <number>]"));
if (!(opt->flags & VSH_OFLAG_REQ_OPT))
shortopt = true;
break;
case VSH_OT_STRING:
/* xgettext:c-format */
fmt = _("[--%s <string>]");
if (!(opt->flags & VSH_OFLAG_REQ_OPT))
shortopt = true;
break;
case VSH_OT_DATA:
fmt = ((opt->flags & VSH_OFLAG_REQ) ? "<%s>" : "[<%s>]");
if (!(opt->flags & VSH_OFLAG_REQ_OPT))
shortopt = true;
break;
case VSH_OT_ARGV:
/* xgettext:c-format */
if (shortopt) {
fmt = (opt->flags & VSH_OFLAG_REQ)
? _("{[--%s] <string>}...")
: _("[[--%s] <string>]...");
} else {
fmt = (opt->flags & VSH_OFLAG_REQ) ? _("<%s>...")
: _("[<%s>]...");
}
break;
case VSH_OT_ALIAS:
/* aliases are intentionally undocumented */
continue;
}
fputc(' ', stdout);
fprintf(stdout, fmt, opt->name);
}
}
fputc('\n', stdout);
if (desc[0]) {
/* Print the description only if it's not empty. */
fputs(_("\n DESCRIPTION\n"), stdout);
fprintf(stdout, " %s\n", _(desc));
}
if (def->opts && def->opts->name) {
const vshCmdOptDef *opt;
fputs(_("\n OPTIONS\n"), stdout);
for (opt = def->opts; opt->name; opt++) {
switch (opt->type) {
case VSH_OT_BOOL:
snprintf(buf, sizeof(buf), "--%s", opt->name);
break;
case VSH_OT_INT:
snprintf(buf, sizeof(buf),
(opt->flags & VSH_OFLAG_REQ) ? _("[--%s] <number>")
: _("--%s <number>"), opt->name);
break;
case VSH_OT_STRING:
/* OT_STRING should never be VSH_OFLAG_REQ */
snprintf(buf, sizeof(buf), _("--%s <string>"), opt->name);
break;
case VSH_OT_DATA:
snprintf(buf, sizeof(buf), _("[--%s] <string>"),
opt->name);
break;
case VSH_OT_ARGV:
snprintf(buf, sizeof(buf),
shortopt ? _("[--%s] <string>") : _("<%s>"),
opt->name);
break;
case VSH_OT_ALIAS:
continue;
}
fprintf(stdout, " %-15s %s\n", buf, _(opt->help));
}
}
fputc('\n', stdout);
}
return true;
}
/* ---------------
* Utils for work with runtime commands data
* ---------------
*/
static void
vshCommandOptFree(vshCmdOpt * arg)
{
vshCmdOpt *a = arg;
while (a) {
vshCmdOpt *tmp = a;
a = a->next;
VIR_FREE(tmp->data);
VIR_FREE(tmp);
}
}
static void
vshCommandFree(vshCmd *cmd)
{
vshCmd *c = cmd;
while (c) {
vshCmd *tmp = c;
c = c->next;
if (tmp->opts)
vshCommandOptFree(tmp->opts);
VIR_FREE(tmp);
}
}
/**
* vshCommandOpt:
* @cmd: parsed command line to search
* @name: option name to search for
* @opt: result of the search
* @needData: true if option must be non-boolean
*
* Look up an option passed to CMD by NAME. Returns 1 with *OPT set
* to the option if found, 0 with *OPT set to NULL if the name is
* valid and the option is not required, -1 with *OPT set to NULL if
* the option is required but not present, and assert if NAME is not
* valid (which indicates a programming error). No error messages are
* issued if a value is returned.
*/
static int
vshCommandOpt(const vshCmd *cmd, const char *name, vshCmdOpt **opt,
bool needData)
{
vshCmdOpt *candidate = cmd->opts;
const vshCmdOptDef *valid = cmd->def->opts;
int ret = 0;
/* See if option is valid and/or required. */
*opt = NULL;
while (valid) {
assert(valid->name);
if (STREQ(name, valid->name))
break;
valid++;
}
assert(!needData || valid->type != VSH_OT_BOOL);
if (valid->flags & VSH_OFLAG_REQ)
ret = -1;
/* See if option is present on command line. */
while (candidate) {
if (STREQ(candidate->def->name, name)) {
*opt = candidate;
ret = 1;
break;
}
candidate = candidate->next;
}
return ret;
}
/**
* vshCommandOptInt:
* @cmd command reference
* @name option name
* @value result
*
* Convert option to int
* Return value:
* >0 if option found and valid (@value updated)
* 0 if option not found and not required (@value untouched)
* <0 in all other cases (@value untouched)
*/
int
vshCommandOptInt(const vshCmd *cmd, const char *name, int *value)
{
vshCmdOpt *arg;
int ret;
ret = vshCommandOpt(cmd, name, &arg, true);
if (ret <= 0)
return ret;
if (virStrToLong_i(arg->data, NULL, 10, value) < 0)
return -1;
return 1;
}
static int
vshCommandOptUIntInternal(const vshCmd *cmd,
const char *name,
unsigned int *value,
bool wrap)
{
vshCmdOpt *arg;
int ret;
if ((ret = vshCommandOpt(cmd, name, &arg, true)) <= 0)
return ret;
if (wrap) {
if (virStrToLong_ui(arg->data, NULL, 10, value) < 0)
return -1;
} else {
if (virStrToLong_uip(arg->data, NULL, 10, value) < 0)
return -1;
}
return 1;
}
/**
* vshCommandOptUInt:
* @cmd command reference
* @name option name
* @value result
*
* Convert option to unsigned int, reject negative numbers
* See vshCommandOptInt()
*/
int
vshCommandOptUInt(const vshCmd *cmd, const char *name, unsigned int *value)
{
return vshCommandOptUIntInternal(cmd, name, value, false);
}
/**
* vshCommandOptUIntWrap:
* @cmd command reference
* @name option name
* @value result
*
* Convert option to unsigned int, wraps negative numbers to positive
* See vshCommandOptInt()
*/
int
vshCommandOptUIntWrap(const vshCmd *cmd, const char *name, unsigned int *value)
{
return vshCommandOptUIntInternal(cmd, name, value, true);
}
static int
vshCommandOptULInternal(const vshCmd *cmd,
const char *name,
unsigned long *value,
bool wrap)
{
vshCmdOpt *arg;
int ret;
if ((ret = vshCommandOpt(cmd, name, &arg, true)) <= 0)
return ret;
if (wrap) {
if (virStrToLong_ul(arg->data, NULL, 10, value) < 0)
return -1;
} else {
if (virStrToLong_ulp(arg->data, NULL, 10, value) < 0)
return -1;
}
return 1;
}
/*
* vshCommandOptUL:
* @cmd command reference
* @name option name
* @value result
*
* Convert option to unsigned long
* See vshCommandOptInt()
*/
int
vshCommandOptUL(const vshCmd *cmd, const char *name, unsigned long *value)
{
return vshCommandOptULInternal(cmd, name, value, false);
}
/**
* vshCommandOptULWrap:
* @cmd command reference
* @name option name
* @value result
*
* Convert option to unsigned long, wraps negative numbers to positive
* See vshCommandOptInt()
*/
int
vshCommandOptULWrap(const vshCmd *cmd, const char *name, unsigned long *value)
{
return vshCommandOptULInternal(cmd, name, value, true);
}
/**
* vshCommandOptString:
* @cmd command reference
* @name option name
* @value result
*
* Returns option as STRING
* Return value:
* >0 if option found and valid (@value updated)
* 0 if option not found and not required (@value untouched)
* <0 in all other cases (@value untouched)
*/
int
vshCommandOptString(const vshCmd *cmd, const char *name, const char **value)
{
vshCmdOpt *arg;
int ret;
ret = vshCommandOpt(cmd, name, &arg, true);
if (ret <= 0)
return ret;
if (!*arg->data && !(arg->def->flags & VSH_OFLAG_EMPTY_OK)) {
return -1;
}
*value = arg->data;
return 1;
}
/**
* vshCommandOptStringReq:
* @ctl virsh control structure
* @cmd command structure
* @name option name
* @value result (updated to NULL or the option argument)
*
* Gets a option argument as string.
*
* Returns 0 on success or when the option is not present and not
* required, *value is set to the option argument. On error -1 is
* returned and error message printed.
*/
int
vshCommandOptStringReq(vshControl *ctl,
const vshCmd *cmd,
const char *name,
const char **value)
{
vshCmdOpt *arg;
int ret;
const char *error = NULL;
/* clear out the value */
*value = NULL;
ret = vshCommandOpt(cmd, name, &arg, true);
/* option is not required and not present */
if (ret == 0)
return 0;
/* this should not be propagated here, just to be sure */
if (ret == -1)
error = N_("Mandatory option not present");
else if (!*arg->data && !(arg->def->flags & VSH_OFLAG_EMPTY_OK))
error = N_("Option argument is empty");
if (error) {
vshError(ctl, _("Failed to get option '%s': %s"), name, _(error));
return -1;
}
*value = arg->data;
return 0;
}
/**
* vshCommandOptLongLong:
* @cmd command reference
* @name option name
* @value result
*
* Returns option as long long
* See vshCommandOptInt()
*/
int
vshCommandOptLongLong(const vshCmd *cmd, const char *name,
long long *value)
{
vshCmdOpt *arg;
int ret;
ret = vshCommandOpt(cmd, name, &arg, true);
if (ret <= 0)
return ret;
if (virStrToLong_ll(arg->data, NULL, 10, value) < 0)
return -1;
return 1;
}
static int
vshCommandOptULongLongInternal(const vshCmd *cmd,
const char *name,
unsigned long long *value,
bool wrap)
{
vshCmdOpt *arg;
int ret;
if ((ret = vshCommandOpt(cmd, name, &arg, true)) <= 0)
return ret;
if (wrap) {
if (virStrToLong_ull(arg->data, NULL, 10, value) < 0)
return -1;
} else {
if (virStrToLong_ullp(arg->data, NULL, 10, value) < 0)
return -1;
}
return 1;
}
/**
* vshCommandOptULongLong:
* @cmd command reference
* @name option name
* @value result
*
* Returns option as long long, rejects negative numbers
* See vshCommandOptInt()
*/
int
vshCommandOptULongLong(const vshCmd *cmd, const char *name,
unsigned long long *value)
{
return vshCommandOptULongLongInternal(cmd, name, value, false);
}
/**
* vshCommandOptULongLongWrap:
* @cmd command reference
* @name option name
* @value result
*
* Returns option as long long, wraps negative numbers to positive
* See vshCommandOptInt()
*/
int
vshCommandOptULongLongWrap(const vshCmd *cmd, const char *name,
unsigned long long *value)
{
return vshCommandOptULongLongInternal(cmd, name, value, true);
}
/**
* vshCommandOptScaledInt:
* @cmd command reference
* @name option name
* @value result
* @scale default of 1 or 1024, if no suffix is present
* @max maximum value permitted
*
* Returns option as long long, scaled according to suffix
* See vshCommandOptInt()
*/
int
vshCommandOptScaledInt(const vshCmd *cmd, const char *name,
unsigned long long *value, int scale,
unsigned long long max)
{
const char *str;
int ret;
char *end;
ret = vshCommandOptString(cmd, name, &str);
if (ret <= 0)
return ret;
if (virStrToLong_ull(str, &end, 10, value) < 0 ||
virScaleInteger(value, end, scale, max) < 0)
return -1;
return 1;
}
/**
* vshCommandOptBool:
* @cmd command reference
* @name option name
*
* Returns true/false if the option exists. Note that this does NOT
* validate whether the option is actually boolean, or even whether
* name is legal; so that this can be used to probe whether a data
* option is present without actually using that data.
*/
bool
vshCommandOptBool(const vshCmd *cmd, const char *name)
{
vshCmdOpt *dummy;
return vshCommandOpt(cmd, name, &dummy, false) == 1;
}
/**
* vshCommandOptArgv:
* @cmd command reference
* @opt starting point for the search
*
* Returns the next argv argument after OPT (or the first one if OPT
* is NULL), or NULL if no more are present.
*
* Requires that a VSH_OT_ARGV option be last in the
* list of supported options in CMD->def->opts.
*/
const vshCmdOpt *
vshCommandOptArgv(const vshCmd *cmd, const vshCmdOpt *opt)
{
opt = opt ? opt->next : cmd->opts;
while (opt) {
if (opt->def->type == VSH_OT_ARGV) {
return opt;
}
opt = opt->next;
}
return NULL;
}
/* Determine whether CMD->opts includes an option with name OPTNAME.
If not, give a diagnostic and return false.
If so, return true. */
bool
vshCmdHasOption(vshControl *ctl, const vshCmd *cmd, const char *optname)
{
/* Iterate through cmd->opts, to ensure that there is an entry
with name OPTNAME and type VSH_OT_DATA. */
bool found = false;
const vshCmdOpt *opt;
for (opt = cmd->opts; opt; opt = opt->next) {
if (STREQ(opt->def->name, optname) && opt->def->type == VSH_OT_DATA) {
found = true;
break;
}
}
if (!found)
vshError(ctl, _("internal error: virsh %s: no %s VSH_OT_DATA option"),
cmd->def->name, optname);
return found;
}
/* Parse an optional --timeout parameter in seconds, but store the
* value of the timeout in milliseconds. Return -1 on error, 0 if
* no timeout was requested, and 1 if timeout was set. */
int
vshCommandOptTimeoutToMs(vshControl *ctl, const vshCmd *cmd, int *timeout)
{
int rv = vshCommandOptInt(cmd, "timeout", timeout);
if (rv < 0 || (rv > 0 && *timeout < 1)) {
vshError(ctl, "%s", _("invalid timeout"));
return -1;
}
if (rv > 0) {
/* Ensure that we can multiply by 1000 without overflowing. */
if (*timeout > INT_MAX / 1000) {
vshError(ctl, "%s", _("timeout is too big"));
return -1;
}
*timeout *= 1000;
}
return rv;
}
static bool
vshConnectionUsability(vshControl *ctl, virConnectPtr conn)
{
if (!conn ||
virConnectIsAlive(conn) == 0) {
vshError(ctl, "%s", _("no valid connection"));
return false;
}
/* The connection is considered dead only if
* virConnectIsAlive() successfuly says so.
*/
vshResetLibvirtError();
return true;
}
/*
* Executes command(s) and returns return code from last command
*/
static bool
vshCommandRun(vshControl *ctl, const vshCmd *cmd)
{
bool ret = true;
while (cmd) {
struct timeval before, after;
bool enable_timing = ctl->timing;
if ((ctl->conn == NULL || disconnected) &&
!(cmd->def->flags & VSH_CMD_FLAG_NOCONNECT))
vshReconnect(ctl);
if (enable_timing)
GETTIMEOFDAY(&before);
if ((cmd->def->flags & VSH_CMD_FLAG_NOCONNECT) ||
vshConnectionUsability(ctl, ctl->conn)) {
ret = cmd->def->handler(ctl, cmd);
} else {
/* connection is not usable, return error */
ret = false;
}
if (enable_timing)
GETTIMEOFDAY(&after);
/* try to automatically catch disconnections */
if (!ret &&
((last_error != NULL) &&
(((last_error->code == VIR_ERR_SYSTEM_ERROR) &&
(last_error->domain == VIR_FROM_REMOTE)) ||
(last_error->code == VIR_ERR_RPC) ||
(last_error->code == VIR_ERR_NO_CONNECT) ||
(last_error->code == VIR_ERR_INVALID_CONN))))
disconnected++;
if (!ret)
vshReportError(ctl);
if (!ret && disconnected != 0)
vshReconnect(ctl);
if (STREQ(cmd->def->name, "quit") ||
STREQ(cmd->def->name, "exit")) /* hack ... */
return ret;
if (enable_timing) {
double diff_ms = (((after.tv_sec - before.tv_sec) * 1000.0) +
((after.tv_usec - before.tv_usec) / 1000.0));
vshPrint(ctl, _("\n(Time: %.3f ms)\n\n"), diff_ms);
} else {
vshPrintExtra(ctl, "\n");
}
cmd = cmd->next;
}
return ret;
}
/* ---------------
* Command parsing
* ---------------
*/
typedef enum {
VSH_TK_ERROR, /* Failed to parse a token */
VSH_TK_ARG, /* Arbitrary argument, might be option or empty */
VSH_TK_SUBCMD_END, /* Separation between commands */
VSH_TK_END /* No more commands */
} vshCommandToken;
typedef struct _vshCommandParser vshCommandParser;
struct _vshCommandParser {
vshCommandToken(*getNextArg)(vshControl *, vshCommandParser *,
char **);
/* vshCommandStringGetArg() */
char *pos;
/* vshCommandArgvGetArg() */
char **arg_pos;
char **arg_end;
};
static bool
vshCommandParse(vshControl *ctl, vshCommandParser *parser)
{
char *tkdata = NULL;
vshCmd *clast = NULL;
vshCmdOpt *first = NULL;
if (ctl->cmd) {
vshCommandFree(ctl->cmd);
ctl->cmd = NULL;
}
while (1) {
vshCmdOpt *last = NULL;
const vshCmdDef *cmd = NULL;
vshCommandToken tk;
bool data_only = false;
uint32_t opts_need_arg = 0;
uint32_t opts_required = 0;
uint32_t opts_seen = 0;
first = NULL;
while (1) {
const vshCmdOptDef *opt = NULL;
tkdata = NULL;
tk = parser->getNextArg(ctl, parser, &tkdata);
if (tk == VSH_TK_ERROR)
goto syntaxError;
if (tk != VSH_TK_ARG) {
VIR_FREE(tkdata);
break;
}
if (cmd == NULL) {
/* first token must be command name */
if (!(cmd = vshCmddefSearch(tkdata))) {
vshError(ctl, _("unknown command: '%s'"), tkdata);
goto syntaxError; /* ... or ignore this command only? */
}
if (vshCmddefOptParse(cmd, &opts_need_arg,
&opts_required) < 0) {
vshError(ctl,
_("internal error: bad options in command: '%s'"),
tkdata);
goto syntaxError;
}
VIR_FREE(tkdata);
} else if (data_only) {
goto get_data;
} else if (tkdata[0] == '-' && tkdata[1] == '-' &&
c_isalnum(tkdata[2])) {
char *optstr = strchr(tkdata + 2, '=');
int opt_index = 0;
if (optstr) {
*optstr = '\0'; /* convert the '=' to '\0' */
optstr = vshStrdup(ctl, optstr + 1);
}
/* Special case 'help' to ignore all spurious options */
if (!(opt = vshCmddefGetOption(ctl, cmd, tkdata + 2,
&opts_seen, &opt_index,
&optstr))) {
VIR_FREE(optstr);
if (STREQ(cmd->name, "help"))
continue;
goto syntaxError;
}
VIR_FREE(tkdata);
if (opt->type != VSH_OT_BOOL) {
/* option data */
if (optstr)
tkdata = optstr;
else
tk = parser->getNextArg(ctl, parser, &tkdata);
if (tk == VSH_TK_ERROR)
goto syntaxError;
if (tk != VSH_TK_ARG) {
vshError(ctl,
_("expected syntax: --%s <%s>"),
opt->name,
opt->type ==
VSH_OT_INT ? _("number") : _("string"));
goto syntaxError;
}
if (opt->type != VSH_OT_ARGV)
opts_need_arg &= ~(1 << opt_index);
} else {
tkdata = NULL;
if (optstr) {
vshError(ctl, _("invalid '=' after option --%s"),
opt->name);
VIR_FREE(optstr);
goto syntaxError;
}
}
} else if (tkdata[0] == '-' && tkdata[1] == '-' &&
tkdata[2] == '\0') {
data_only = true;
continue;
} else {
get_data:
/* Special case 'help' to ignore spurious data */
if (!(opt = vshCmddefGetData(cmd, &opts_need_arg,
&opts_seen)) &&
STRNEQ(cmd->name, "help")) {
vshError(ctl, _("unexpected data '%s'"), tkdata);
goto syntaxError;
}
}
if (opt) {
/* save option */
vshCmdOpt *arg = vshMalloc(ctl, sizeof(vshCmdOpt));
arg->def = opt;
arg->data = tkdata;
arg->next = NULL;
tkdata = NULL;
if (!first)
first = arg;
if (last)
last->next = arg;
last = arg;
vshDebug(ctl, VSH_ERR_INFO, "%s: %s(%s): %s\n",
cmd->name,
opt->name,
opt->type != VSH_OT_BOOL ? _("optdata") : _("bool"),
opt->type != VSH_OT_BOOL ? arg->data : _("(none)"));
}
}
/* command parsed -- allocate new struct for the command */
if (cmd) {
vshCmd *c = vshMalloc(ctl, sizeof(vshCmd));
vshCmdOpt *tmpopt = first;
/* if we encountered --help, replace parsed command with
* 'help <cmdname>' */
for (tmpopt = first; tmpopt; tmpopt = tmpopt->next) {
if (STRNEQ(tmpopt->def->name, "help"))
continue;
vshCommandOptFree(first);
first = vshMalloc(ctl, sizeof(vshCmdOpt));
first->def = &(opts_help[0]);
first->data = vshStrdup(ctl, cmd->name);
first->next = NULL;
cmd = vshCmddefSearch("help");
opts_required = 0;
opts_seen = 0;
break;
}
c->opts = first;
c->def = cmd;
c->next = NULL;
if (vshCommandCheckOpts(ctl, c, opts_required, opts_seen) < 0) {
VIR_FREE(c);
goto syntaxError;
}
if (!ctl->cmd)
ctl->cmd = c;
if (clast)
clast->next = c;
clast = c;
}
if (tk == VSH_TK_END)
break;
}
return true;
syntaxError:
if (ctl->cmd) {
vshCommandFree(ctl->cmd);
ctl->cmd = NULL;
}
if (first)
vshCommandOptFree(first);
VIR_FREE(tkdata);
return false;
}
/* --------------------
* Command argv parsing
* --------------------
*/
static vshCommandToken ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3)
vshCommandArgvGetArg(vshControl *ctl, vshCommandParser *parser, char **res)
{
if (parser->arg_pos == parser->arg_end) {
*res = NULL;
return VSH_TK_END;
}
*res = vshStrdup(ctl, *parser->arg_pos);
parser->arg_pos++;
return VSH_TK_ARG;
}
static bool
vshCommandArgvParse(vshControl *ctl, int nargs, char **argv)
{
vshCommandParser parser;
if (nargs <= 0)
return false;
parser.arg_pos = argv;
parser.arg_end = argv + nargs;
parser.getNextArg = vshCommandArgvGetArg;
return vshCommandParse(ctl, &parser);
}
/* ----------------------
* Command string parsing
* ----------------------
*/
static vshCommandToken ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3)
vshCommandStringGetArg(vshControl *ctl, vshCommandParser *parser, char **res)
{
bool single_quote = false;
bool double_quote = false;
int sz = 0;
char *p = parser->pos;
char *q = vshStrdup(ctl, p);
*res = q;
while (*p && (*p == ' ' || *p == '\t'))
p++;
if (*p == '\0')
return VSH_TK_END;
if (*p == ';') {
parser->pos = ++p; /* = \0 or begin of next command */
return VSH_TK_SUBCMD_END;
}
while (*p) {
/* end of token is blank space or ';' */
if (!double_quote && !single_quote &&
(*p == ' ' || *p == '\t' || *p == ';'))
break;
if (!double_quote && *p == '\'') { /* single quote */
single_quote = !single_quote;
p++;
continue;
} else if (!single_quote && *p == '\\') { /* escape */
/*
* The same as the bash, a \ in "" is an escaper,
* but a \ in '' is not an escaper.
*/
p++;
if (*p == '\0') {
vshError(ctl, "%s", _("dangling \\"));
return VSH_TK_ERROR;
}
} else if (!single_quote && *p == '"') { /* double quote */
double_quote = !double_quote;
p++;
continue;
}
*q++ = *p++;
sz++;
}
if (double_quote) {
vshError(ctl, "%s", _("missing \""));
return VSH_TK_ERROR;
}
*q = '\0';
parser->pos = p;
return VSH_TK_ARG;
}
static bool
vshCommandStringParse(vshControl *ctl, char *cmdstr)
{
vshCommandParser parser;
if (cmdstr == NULL || *cmdstr == '\0')
return false;
parser.pos = cmdstr;
parser.getNextArg = vshCommandStringGetArg;
return vshCommandParse(ctl, &parser);
}
/* ---------------
* Misc utils
* ---------------
*/
int
vshDomainState(vshControl *ctl, virDomainPtr dom, int *reason)
{
virDomainInfo info;
if (reason)
*reason = -1;
if (!ctl->useGetInfo) {
int state;
if (virDomainGetState(dom, &state, reason, 0) < 0) {
virErrorPtr err = virGetLastError();
if (err && err->code == VIR_ERR_NO_SUPPORT)
ctl->useGetInfo = true;
else
return -1;
} else {
return state;
}
}
/* fall back to virDomainGetInfo if virDomainGetState is not supported */
if (virDomainGetInfo(dom, &info) < 0)
return -1;
else
return info.state;
}
/* Return a non-NULL string representation of a typed parameter; exit
* if we are out of memory. */
char *
vshGetTypedParamValue(vshControl *ctl, virTypedParameterPtr item)
{
int ret = 0;
char *str = NULL;
switch (item->type) {
case VIR_TYPED_PARAM_INT:
ret = virAsprintf(&str, "%d", item->value.i);
break;
case VIR_TYPED_PARAM_UINT:
ret = virAsprintf(&str, "%u", item->value.ui);
break;
case VIR_TYPED_PARAM_LLONG:
ret = virAsprintf(&str, "%lld", item->value.l);
break;
case VIR_TYPED_PARAM_ULLONG:
ret = virAsprintf(&str, "%llu", item->value.ul);
break;
case VIR_TYPED_PARAM_DOUBLE:
ret = virAsprintf(&str, "%f", item->value.d);
break;
case VIR_TYPED_PARAM_BOOLEAN:
str = vshStrdup(ctl, item->value.b ? _("yes") : _("no"));
break;
case VIR_TYPED_PARAM_STRING:
str = vshStrdup(ctl, item->value.s);
break;
default:
vshError(ctl, _("unimplemented parameter type %d"), item->type);
}
if (ret < 0) {
vshError(ctl, "%s", _("Out of memory"));
exit(EXIT_FAILURE);
}
return str;
}
void
vshDebug(vshControl *ctl, int level, const char *format, ...)
{
va_list ap;
char *str;
/* Aligning log levels to that of libvirt.
* Traces with levels >= user-specified-level
* gets logged into file
*/
if (level < ctl->debug)
return;
va_start(ap, format);
vshOutputLogFile(ctl, level, format, ap);
va_end(ap);
va_start(ap, format);
if (virVasprintf(&str, format, ap) < 0) {
/* Skip debug messages on low memory */
va_end(ap);
return;
}
va_end(ap);
fputs(str, stdout);
VIR_FREE(str);
}
void
vshPrintExtra(vshControl *ctl, const char *format, ...)
{
va_list ap;
char *str;
if (ctl && ctl->quiet)
return;
va_start(ap, format);
if (virVasprintf(&str, format, ap) < 0) {
vshError(ctl, "%s", _("Out of memory"));
va_end(ap);
return;
}
va_end(ap);
fputs(str, stdout);
VIR_FREE(str);
}
bool
vshTTYIsInterruptCharacter(vshControl *ctl ATTRIBUTE_UNUSED,
const char chr ATTRIBUTE_UNUSED)
{
#ifndef WIN32
if (ctl->istty &&
ctl->termattr.c_cc[VINTR] == chr)
return true;
#endif
return false;
}
bool
vshTTYAvailable(vshControl *ctl)
{
return ctl->istty;
}
int
vshTTYDisableInterrupt(vshControl *ctl ATTRIBUTE_UNUSED)
{
#ifndef WIN32
struct termios termset = ctl->termattr;
if (!ctl->istty)
return -1;
/* check if we need to set the terminal */
if (termset.c_cc[VINTR] == _POSIX_VDISABLE)
return 0;
termset.c_cc[VINTR] = _POSIX_VDISABLE;
termset.c_lflag &= ~ICANON;
if (tcsetattr(STDIN_FILENO, TCSANOW, &termset) < 0)
return -1;
#endif
return 0;
}
int
vshTTYRestore(vshControl *ctl ATTRIBUTE_UNUSED)
{
#ifndef WIN32
if (!ctl->istty)
return 0;
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &ctl->termattr) < 0)
return -1;
#endif
return 0;
}
#if !defined(WIN32) && !defined(HAVE_CFMAKERAW)
/* provide fallback in case cfmakeraw isn't available */
static void
cfmakeraw(struct termios *attr)
{
attr->c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP
| INLCR | IGNCR | ICRNL | IXON);
attr->c_oflag &= ~OPOST;
attr->c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
attr->c_cflag &= ~(CSIZE | PARENB);
attr->c_cflag |= CS8;
}
#endif /* !WIN32 && !HAVE_CFMAKERAW */
int
vshTTYMakeRaw(vshControl *ctl ATTRIBUTE_UNUSED,
bool report_errors ATTRIBUTE_UNUSED)
{
#ifndef WIN32
struct termios rawattr = ctl->termattr;
char ebuf[1024];
if (!ctl->istty) {
if (report_errors) {
vshError(ctl, "%s",
_("unable to make terminal raw: console isn't a tty"));
}
return -1;
}
cfmakeraw(&rawattr);
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &rawattr) < 0) {
if (report_errors)
vshError(ctl, _("unable to set tty attributes: %s"),
virStrerror(errno, ebuf, sizeof(ebuf)));
return -1;
}
#endif
return 0;
}
void
vshError(vshControl *ctl, const char *format, ...)
{
va_list ap;
char *str;
if (ctl != NULL) {
va_start(ap, format);
vshOutputLogFile(ctl, VSH_ERR_ERROR, format, ap);
va_end(ap);
}
/* Most output is to stdout, but if someone ran virsh 2>&1, then
* printing to stderr will not interleave correctly with stdout
* unless we flush between every transition between streams. */
fflush(stdout);
fputs(_("error: "), stderr);
va_start(ap, format);
/* We can't recursively call vshError on an OOM situation, so ignore
failure here. */
ignore_value(virVasprintf(&str, format, ap));
va_end(ap);
fprintf(stderr, "%s\n", NULLSTR(str));
fflush(stderr);
VIR_FREE(str);
}
static void
vshEventLoop(void *opaque)
{
vshControl *ctl = opaque;
while (1) {
bool quit;
virMutexLock(&ctl->lock);
quit = ctl->quit;
virMutexUnlock(&ctl->lock);
if (quit)
break;
if (virEventRunDefaultImpl() < 0)
vshReportError(ctl);
}
}
/*
* Helpers for waiting for a libvirt event.
*/
/* We want to use SIGINT to cancel a wait; but as signal handlers
* don't have an opaque argument, we have to use static storage. */
static int vshEventFd = -1;
static struct sigaction vshEventOldAction;
/* Signal handler installed in vshEventStart, removed in vshEventCleanup. */
static void
vshEventInt(int sig ATTRIBUTE_UNUSED,
siginfo_t *siginfo ATTRIBUTE_UNUSED,
void *context ATTRIBUTE_UNUSED)
{
char reason = VSH_EVENT_INTERRUPT;
if (vshEventFd >= 0)
ignore_value(safewrite(vshEventFd, &reason, 1));
}
/* Event loop handler used to limit length of waiting for any other event. */
static void
vshEventTimeout(int timer ATTRIBUTE_UNUSED,
void *opaque)
{
vshControl *ctl = opaque;
char reason = VSH_EVENT_TIMEOUT;
if (ctl->eventPipe[1] >= 0)
ignore_value(safewrite(ctl->eventPipe[1], &reason, 1));
}
/**
* vshEventStart:
* @ctl virsh command struct
* @timeout_ms max wait time in milliseconds, or 0 for indefinite
*
* Set up a wait for a libvirt event. The wait can be canceled by
* SIGINT or by calling vshEventDone() in your event handler. If
* @timeout_ms is positive, the wait will also end if the timeout
* expires. Call vshEventWait() to block the main thread (the event
* handler runs in the event loop thread). When done (including if
* there was an error registering for an event), use vshEventCleanup()
* to quit waiting. Returns 0 on success, -1 on failure. */
int
vshEventStart(vshControl *ctl, int timeout_ms)
{
struct sigaction action;
assert(ctl->eventPipe[0] == -1 && ctl->eventPipe[1] == -1 &&
vshEventFd == -1 && ctl->eventTimerId >= 0);
if (pipe2(ctl->eventPipe, O_CLOEXEC) < 0) {
char ebuf[1024];
vshError(ctl, _("failed to create pipe: %s"),
virStrerror(errno, ebuf, sizeof(ebuf)));
return -1;
}
vshEventFd = ctl->eventPipe[1];
action.sa_sigaction = vshEventInt;
action.sa_flags = SA_SIGINFO;
sigemptyset(&action.sa_mask);
sigaction(SIGINT, &action, &vshEventOldAction);
if (timeout_ms)
virEventUpdateTimeout(ctl->eventTimerId, timeout_ms);
return 0;
}
/**
* vshEventDone:
* @ctl virsh command struct
*
* Call this from an event callback to let the main thread quit
* blocking on further events.
*/
void
vshEventDone(vshControl *ctl)
{
char reason = VSH_EVENT_DONE;
if (ctl->eventPipe[1] >= 0)
ignore_value(safewrite(ctl->eventPipe[1], &reason, 1));
}
/**
* vshEventWait:
* @ctl virsh command struct
*
* Call this in the main thread after calling vshEventStart() then
* registering for one or more events. This call will block until
* SIGINT, the timeout registered at the start, or until one of your
* event handlers calls vshEventDone(). Returns an enum VSH_EVENT_*
* stating how the wait concluded, or -1 on error.
*/
int
vshEventWait(vshControl *ctl)
{
char buf;
int rv;
assert(ctl->eventPipe[0] >= 0);
while ((rv = read(ctl->eventPipe[0], &buf, 1)) < 0 && errno == EINTR);
if (rv != 1) {
char ebuf[1024];
if (!rv)
errno = EPIPE;
vshError(ctl, _("failed to determine loop exit status: %s"),
virStrerror(errno, ebuf, sizeof(ebuf)));
return -1;
}
return buf;
}
/**
* vshEventCleanup:
* @ctl virsh command struct
*
* Call at the end of any function that has used vshEventStart(), to
* tear down any remaining SIGINT or timeout handlers.
*/
void
vshEventCleanup(vshControl *ctl)
{
if (vshEventFd >= 0) {
sigaction(SIGINT, &vshEventOldAction, NULL);
vshEventFd = -1;
}
VIR_FORCE_CLOSE(ctl->eventPipe[0]);
VIR_FORCE_CLOSE(ctl->eventPipe[1]);
virEventUpdateTimeout(ctl->eventTimerId, -1);
}
/*
* Initialize debug settings.
*/
static void
vshInitDebug(vshControl *ctl)
{
const char *debugEnv;
if (ctl->debug == VSH_DEBUG_DEFAULT) {
/* log level not set from commandline, check env variable */
debugEnv = virGetEnvAllowSUID("VIRSH_DEBUG");
if (debugEnv) {
int debug;
if (virStrToLong_i(debugEnv, NULL, 10, &debug) < 0 ||
debug < VSH_ERR_DEBUG || debug > VSH_ERR_ERROR) {
vshError(ctl, "%s",
_("VIRSH_DEBUG not set with a valid numeric value"));
} else {
ctl->debug = debug;
}
}
}
if (ctl->logfile == NULL) {
/* log file not set from cmdline */
debugEnv = virGetEnvBlockSUID("VIRSH_LOG_FILE");
if (debugEnv && *debugEnv) {
ctl->logfile = vshStrdup(ctl, debugEnv);
vshOpenLogFile(ctl);
}
}
}
/*
* Initialize connection.
*/
static bool
vshInit(vshControl *ctl)
{
/* Since we have the commandline arguments parsed, we need to
* re-initialize all the debugging to make it work properly */
vshInitDebug(ctl);
if (ctl->conn)
return false;
/* set up the library error handler */
virSetErrorFunc(NULL, virshErrorHandler);
if (virEventRegisterDefaultImpl() < 0)
return false;
if (virThreadCreate(&ctl->eventLoop, true, vshEventLoop, ctl) < 0)
return false;
ctl->eventLoopStarted = true;
if ((ctl->eventTimerId = virEventAddTimeout(-1, vshEventTimeout, ctl,
NULL)) < 0)
return false;
if (ctl->name) {
vshReconnect(ctl);
/* Connecting to a named connection must succeed, but we delay
* connecting to the default connection until we need it
* (since the first command might be 'connect' which allows a
* non-default connection, or might be 'help' which needs no
* connection).
*/
if (!ctl->conn) {
vshReportError(ctl);
return false;
}
}
return true;
}
#define LOGFILE_FLAGS (O_WRONLY | O_APPEND | O_CREAT | O_SYNC)
/**
* vshOpenLogFile:
*
* Open log file.
*/
void
vshOpenLogFile(vshControl *ctl)
{
if (ctl->logfile == NULL)
return;
if ((ctl->log_fd = open(ctl->logfile, LOGFILE_FLAGS, FILE_MODE)) < 0) {
vshError(ctl, "%s",
_("failed to open the log file. check the log file path"));
exit(EXIT_FAILURE);
}
}
/**
* vshOutputLogFile:
*
* Outputting an error to log file.
*/
void
vshOutputLogFile(vshControl *ctl, int log_level, const char *msg_format,
va_list ap)
{
virBuffer buf = VIR_BUFFER_INITIALIZER;
char *str = NULL;
size_t len;
const char *lvl = "";
time_t stTime;
struct tm stTm;
if (ctl->log_fd == -1)
return;
/**
* create log format
*
* [YYYY.MM.DD HH:MM:SS SIGNATURE PID] LOG_LEVEL message
*/
time(&stTime);
localtime_r(&stTime, &stTm);
virBufferAsprintf(&buf, "[%d.%02d.%02d %02d:%02d:%02d %s %d] ",
(1900 + stTm.tm_year),
(1 + stTm.tm_mon),
stTm.tm_mday,
stTm.tm_hour,
stTm.tm_min,
stTm.tm_sec,
SIGN_NAME,
(int) getpid());
switch (log_level) {
case VSH_ERR_DEBUG:
lvl = LVL_DEBUG;
break;
case VSH_ERR_INFO:
lvl = LVL_INFO;
break;
case VSH_ERR_NOTICE:
lvl = LVL_INFO;
break;
case VSH_ERR_WARNING:
lvl = LVL_WARNING;
break;
case VSH_ERR_ERROR:
lvl = LVL_ERROR;
break;
default:
lvl = LVL_DEBUG;
break;
}
virBufferAsprintf(&buf, "%s ", lvl);
virBufferVasprintf(&buf, msg_format, ap);
virBufferAddChar(&buf, '\n');
if (virBufferError(&buf))
goto error;
str = virBufferContentAndReset(&buf);
len = strlen(str);
if (len > 1 && str[len - 2] == '\n') {
str[len - 1] = '\0';
len--;
}
/* write log */
if (safewrite(ctl->log_fd, str, len) < 0)
goto error;
VIR_FREE(str);
return;
error:
vshCloseLogFile(ctl);
vshError(ctl, "%s", _("failed to write the log file"));
virBufferFreeAndReset(&buf);
VIR_FREE(str);
}
/**
* vshCloseLogFile:
*
* Close log file.
*/
void
vshCloseLogFile(vshControl *ctl)
{
char ebuf[1024];
/* log file close */
if (VIR_CLOSE(ctl->log_fd) < 0) {
vshError(ctl, _("%s: failed to write log file: %s"),
ctl->logfile ? ctl->logfile : "?",
virStrerror(errno, ebuf, sizeof(ebuf)));
}
if (ctl->logfile) {
VIR_FREE(ctl->logfile);
ctl->logfile = NULL;
}
}
#if WITH_READLINE
/* -----------------
* Readline stuff
* -----------------
*/
/*
* Generator function for command completion. STATE lets us
* know whether to start from scratch; without any state
* (i.e. STATE == 0), then we start at the top of the list.
*/
static char *
vshReadlineCommandGenerator(const char *text, int state)
{
static int grp_list_index, cmd_list_index, len;
const char *name;
const vshCmdGrp *grp;
const vshCmdDef *cmds;
if (!state) {
grp_list_index = 0;
cmd_list_index = 0;
len = strlen(text);
}
grp = cmdGroups;
/* Return the next name which partially matches from the
* command list.
*/
while (grp[grp_list_index].name) {
cmds = grp[grp_list_index].commands;
if (cmds[cmd_list_index].name) {
while ((name = cmds[cmd_list_index].name)) {
cmd_list_index++;
if (STREQLEN(name, text, len))
return vshStrdup(NULL, name);
}
} else {
cmd_list_index = 0;
grp_list_index++;
}
}
/* If no names matched, then return NULL. */
return NULL;
}
static char *
vshReadlineOptionsGenerator(const char *text, int state)
{
static int list_index, len;
static const vshCmdDef *cmd = NULL;
const char *name;
if (!state) {
/* determine command name */
char *p;
char *cmdname;
if (!(p = strchr(rl_line_buffer, ' ')))
return NULL;
cmdname = vshCalloc(NULL, (p - rl_line_buffer) + 1, 1);
memcpy(cmdname, rl_line_buffer, p - rl_line_buffer);
cmd = vshCmddefSearch(cmdname);
list_index = 0;
len = strlen(text);
VIR_FREE(cmdname);
}
if (!cmd)
return NULL;
if (!cmd->opts)
return NULL;
while ((name = cmd->opts[list_index].name)) {
const vshCmdOptDef *opt = &cmd->opts[list_index];
char *res;
list_index++;
if (opt->type == VSH_OT_DATA || opt->type == VSH_OT_ARGV)
/* ignore non --option */
continue;
if (len > 2) {
if (STRNEQLEN(name, text + 2, len - 2))
continue;
}
res = vshMalloc(NULL, strlen(name) + 3);
snprintf(res, strlen(name) + 3, "--%s", name);
return res;
}
/* If no names matched, then return NULL. */
return NULL;
}
static char **
vshReadlineCompletion(const char *text, int start,
int end ATTRIBUTE_UNUSED)
{
char **matches = (char **) NULL;
if (start == 0)
/* command name generator */
matches = rl_completion_matches(text, vshReadlineCommandGenerator);
else
/* commands options */
matches = rl_completion_matches(text, vshReadlineOptionsGenerator);
return matches;
}
# define VIRSH_HISTSIZE_MAX 500000
static int
vshReadlineInit(vshControl *ctl)
{
char *userdir = NULL;
int max_history = 500;
const char *histsize_str;
/* Allow conditional parsing of the ~/.inputrc file.
* Work around ancient readline 4.1 (hello Mac OS X),
* which declared it as 'char *' instead of 'const char *'.
*/
rl_readline_name = (char *) "virsh";
/* Tell the completer that we want a crack first. */
rl_attempted_completion_function = vshReadlineCompletion;
/* Limit the total size of the history buffer */
if ((histsize_str = virGetEnvBlockSUID("VIRSH_HISTSIZE"))) {
if (virStrToLong_i(histsize_str, NULL, 10, &max_history) < 0) {
vshError(ctl, "%s", _("Bad $VIRSH_HISTSIZE value."));
VIR_FREE(userdir);
return -1;
} else if (max_history > VIRSH_HISTSIZE_MAX || max_history < 0) {
vshError(ctl, _("$VIRSH_HISTSIZE value should be between 0 and %d"),
VIRSH_HISTSIZE_MAX);
VIR_FREE(userdir);
return -1;
}
}
stifle_history(max_history);
/* Prepare to read/write history from/to the $XDG_CACHE_HOME/virsh/history file */
userdir = virGetUserCacheDirectory();
if (userdir == NULL) {
vshError(ctl, "%s", _("Could not determine home directory"));
return -1;
}
if (virAsprintf(&ctl->historydir, "%s/virsh", userdir) < 0) {
vshError(ctl, "%s", _("Out of memory"));
VIR_FREE(userdir);
return -1;
}
if (virAsprintf(&ctl->historyfile, "%s/history", ctl->historydir) < 0) {
vshError(ctl, "%s", _("Out of memory"));
VIR_FREE(userdir);
return -1;
}
VIR_FREE(userdir);
read_history(ctl->historyfile);
return 0;
}
static void
vshReadlineDeinit(vshControl *ctl)
{
if (ctl->historyfile != NULL) {
if (virFileMakePathWithMode(ctl->historydir, 0755) < 0 &&
errno != EEXIST) {
char ebuf[1024];
vshError(ctl, _("Failed to create '%s': %s"),
ctl->historydir, virStrerror(errno, ebuf, sizeof(ebuf)));
} else {
write_history(ctl->historyfile);
}
}
VIR_FREE(ctl->historydir);
VIR_FREE(ctl->historyfile);
}
static char *
vshReadline(vshControl *ctl ATTRIBUTE_UNUSED, const char *prompt)
{
return readline(prompt);
}
#else /* !WITH_READLINE */
static int
vshReadlineInit(vshControl *ctl ATTRIBUTE_UNUSED)
{
/* empty */
return 0;
}
static void
vshReadlineDeinit(vshControl *ctl ATTRIBUTE_UNUSED)
{
/* empty */
}
static char *
vshReadline(vshControl *ctl, const char *prompt)
{
char line[1024];
char *r;
int len;
fputs(prompt, stdout);
r = fgets(line, sizeof(line), stdin);
if (r == NULL) return NULL; /* EOF */
/* Chomp trailing \n */
len = strlen(r);
if (len > 0 && r[len-1] == '\n')
r[len-1] = '\0';
return vshStrdup(ctl, r);
}
#endif /* !WITH_READLINE */
static void
vshDeinitTimer(int timer ATTRIBUTE_UNUSED, void *opaque ATTRIBUTE_UNUSED)
{
/* nothing to be done here */
}
/*
* Deinitialize virsh
*/
static bool
vshDeinit(vshControl *ctl)
{
vshReadlineDeinit(ctl);
vshCloseLogFile(ctl);
VIR_FREE(ctl->name);
if (ctl->conn) {
int ret;
virConnectUnregisterCloseCallback(ctl->conn, vshCatchDisconnect);
ret = virConnectClose(ctl->conn);
if (ret < 0)
vshError(ctl, "%s", _("Failed to disconnect from the hypervisor"));
else if (ret > 0)
vshError(ctl, "%s", _("One or more references were leaked after "
"disconnect from the hypervisor"));
}
virResetLastError();
if (ctl->eventLoopStarted) {
int timer;
virMutexLock(&ctl->lock);
ctl->quit = true;
/* HACK: Add a dummy timeout to break event loop */
timer = virEventAddTimeout(0, vshDeinitTimer, NULL, NULL);
virMutexUnlock(&ctl->lock);
virThreadJoin(&ctl->eventLoop);
if (timer != -1)
virEventRemoveTimeout(timer);
if (ctl->eventTimerId != -1)
virEventRemoveTimeout(ctl->eventTimerId);
ctl->eventLoopStarted = false;
}
virMutexDestroy(&ctl->lock);
return true;
}
/*
* Print usage
*/
static void
vshUsage(void)
{
const vshCmdGrp *grp;
const vshCmdDef *cmd;
fprintf(stdout, _("\n%s [options]... [<command_string>]"
"\n%s [options]... <command> [args...]\n\n"
" options:\n"
" -c | --connect=URI hypervisor connection URI\n"
" -d | --debug=NUM debug level [0-4]\n"
" -e | --escape <char> set escape sequence for console\n"
" -h | --help this help\n"
" -k | --keepalive-interval=NUM\n"
" keepalive interval in seconds, 0 for disable\n"
" -K | --keepalive-count=NUM\n"
" number of possible missed keepalive messages\n"
" -l | --log=FILE output logging to file\n"
" -q | --quiet quiet mode\n"
" -r | --readonly connect readonly\n"
" -t | --timing print timing information\n"
" -v short version\n"
" -V long version\n"
" --version[=TYPE] version, TYPE is short or long (default short)\n"
" commands (non interactive mode):\n\n"), progname, progname);
for (grp = cmdGroups; grp->name; grp++) {
fprintf(stdout, _(" %s (help keyword '%s')\n"),
grp->name, grp->keyword);
for (cmd = grp->commands; cmd->name; cmd++) {
if (cmd->flags & VSH_CMD_FLAG_ALIAS)
continue;
fprintf(stdout,
" %-30s %s\n", cmd->name,
_(vshCmddefGetInfo(cmd, "help")));
}
fprintf(stdout, "\n");
}
fprintf(stdout, "%s",
_("\n (specify help <group> for details about the commands in the group)\n"));
fprintf(stdout, "%s",
_("\n (specify help <command> for details about the command)\n\n"));
return;
}
/*
* Show version and options compiled in
*/
static void
vshShowVersion(vshControl *ctl ATTRIBUTE_UNUSED)
{
/* FIXME - list a copyright blurb, as in GNU programs? */
vshPrint(ctl, _("Virsh command line tool of libvirt %s\n"), VERSION);
vshPrint(ctl, _("See web site at %s\n\n"), "http://libvirt.org/");
vshPrint(ctl, "%s", _("Compiled with support for:\n"));
vshPrint(ctl, "%s", _(" Hypervisors:"));
#ifdef WITH_QEMU
vshPrint(ctl, " QEMU/KVM");
#endif
#ifdef WITH_LXC
vshPrint(ctl, " LXC");
#endif
#ifdef WITH_UML
vshPrint(ctl, " UML");
#endif
#ifdef WITH_XEN
vshPrint(ctl, " Xen");
#endif
#ifdef WITH_LIBXL
vshPrint(ctl, " LibXL");
#endif
#ifdef WITH_OPENVZ
vshPrint(ctl, " OpenVZ");
#endif
#ifdef WITH_VMWARE
vshPrint(ctl, " VMWare");
#endif
#ifdef WITH_PHYP
vshPrint(ctl, " PHYP");
#endif
#ifdef WITH_VBOX
vshPrint(ctl, " VirtualBox");
#endif
#ifdef WITH_ESX
vshPrint(ctl, " ESX");
#endif
#ifdef WITH_HYPERV
vshPrint(ctl, " Hyper-V");
#endif
#ifdef WITH_XENAPI
vshPrint(ctl, " XenAPI");
#endif
#ifdef WITH_BHYVE
vshPrint(ctl, " Bhyve");
#endif
#ifdef WITH_TEST
vshPrint(ctl, " Test");
#endif
vshPrint(ctl, "\n");
vshPrint(ctl, "%s", _(" Networking:"));
#ifdef WITH_REMOTE
vshPrint(ctl, " Remote");
#endif
#ifdef WITH_NETWORK
vshPrint(ctl, " Network");
#endif
#ifdef WITH_BRIDGE
vshPrint(ctl, " Bridging");
#endif
#if defined(WITH_INTERFACE)
vshPrint(ctl, " Interface");
# if defined(WITH_NETCF)
vshPrint(ctl, " netcf");
# elif defined(WITH_UDEV)
vshPrint(ctl, " udev");
# endif
#endif
#ifdef WITH_NWFILTER
vshPrint(ctl, " Nwfilter");
#endif
#ifdef WITH_VIRTUALPORT
vshPrint(ctl, " VirtualPort");
#endif
vshPrint(ctl, "\n");
vshPrint(ctl, "%s", _(" Storage:"));
#ifdef WITH_STORAGE_DIR
vshPrint(ctl, " Dir");
#endif
#ifdef WITH_STORAGE_DISK
vshPrint(ctl, " Disk");
#endif
#ifdef WITH_STORAGE_FS
vshPrint(ctl, " Filesystem");
#endif
#ifdef WITH_STORAGE_SCSI
vshPrint(ctl, " SCSI");
#endif
#ifdef WITH_STORAGE_MPATH
vshPrint(ctl, " Multipath");
#endif
#ifdef WITH_STORAGE_ISCSI
vshPrint(ctl, " iSCSI");
#endif
#ifdef WITH_STORAGE_LVM
vshPrint(ctl, " LVM");
#endif
#ifdef WITH_STORAGE_RBD
vshPrint(ctl, " RBD");
#endif
#ifdef WITH_STORAGE_SHEEPDOG
vshPrint(ctl, " Sheepdog");
#endif
#ifdef WITH_STORAGE_GLUSTER
vshPrint(ctl, " Gluster");
#endif
vshPrint(ctl, "\n");
vshPrint(ctl, "%s", _(" Miscellaneous:"));
#ifdef WITH_LIBVIRTD
vshPrint(ctl, " Daemon");
#endif
#ifdef WITH_NODE_DEVICES
vshPrint(ctl, " Nodedev");
#endif
#ifdef WITH_SECDRIVER_APPARMOR
vshPrint(ctl, " AppArmor");
#endif
#ifdef WITH_SECDRIVER_SELINUX
vshPrint(ctl, " SELinux");
#endif
#ifdef WITH_SECRETS
vshPrint(ctl, " Secrets");
#endif
#ifdef ENABLE_DEBUG
vshPrint(ctl, " Debug");
#endif
#ifdef WITH_DTRACE_PROBES
vshPrint(ctl, " DTrace");
#endif
#if WITH_READLINE
vshPrint(ctl, " Readline");
#endif
#ifdef WITH_DRIVER_MODULES
vshPrint(ctl, " Modular");
#endif
vshPrint(ctl, "\n");
}
static bool
vshAllowedEscapeChar(char c)
{
/* Allowed escape characters:
* a-z A-Z @ [ \ ] ^ _
*/
return ('a' <= c && c <= 'z') ||
('@' <= c && c <= '_');
}
/*
* argv[]: virsh [options] [command]
*
*/
static bool
vshParseArgv(vshControl *ctl, int argc, char **argv)
{
int arg, len, debug, keepalive;
size_t i;
int longindex = -1;
struct option opt[] = {
{"connect", required_argument, NULL, 'c'},
{"debug", required_argument, NULL, 'd'},
{"escape", required_argument, NULL, 'e'},
{"help", no_argument, NULL, 'h'},
{"keepalive-interval", required_argument, NULL, 'k'},
{"keepalive-count", required_argument, NULL, 'K'},
{"log", required_argument, NULL, 'l'},
{"quiet", no_argument, NULL, 'q'},
{"readonly", no_argument, NULL, 'r'},
{"timing", no_argument, NULL, 't'},
{"version", optional_argument, NULL, 'v'},
{NULL, 0, NULL, 0}
};
/* Standard (non-command) options. The leading + ensures that no
* argument reordering takes place, so that command options are
* not confused with top-level virsh options. */
while ((arg = getopt_long(argc, argv, "+:c:d:e:hk:K:l:qrtvV", opt, &longindex)) != -1) {
switch (arg) {
case 'c':
VIR_FREE(ctl->name);
ctl->name = vshStrdup(ctl, optarg);
break;
case 'd':
if (virStrToLong_i(optarg, NULL, 10, &debug) < 0) {
vshError(ctl, _("option %s takes a numeric argument"),
longindex == -1 ? "-d" : "--debug");
exit(EXIT_FAILURE);
}
if (debug < VSH_ERR_DEBUG || debug > VSH_ERR_ERROR)
vshError(ctl, _("ignoring debug level %d out of range [%d-%d]"),
debug, VSH_ERR_DEBUG, VSH_ERR_ERROR);
else
ctl->debug = debug;
break;
case 'e':
len = strlen(optarg);
if ((len == 2 && *optarg == '^' &&
vshAllowedEscapeChar(optarg[1])) ||
(len == 1 && *optarg != '^')) {
ctl->escapeChar = optarg;
} else {
vshError(ctl, _("Invalid string '%s' for escape sequence"),
optarg);
exit(EXIT_FAILURE);
}
break;
case 'h':
vshUsage();
exit(EXIT_SUCCESS);
break;
case 'k':
if (virStrToLong_i(optarg, NULL, 0, &keepalive) < 0 ||
keepalive < 0) {
vshError(ctl, _("option -%s requires a positive numeric argument"),
longindex == -1 ? "-k" : "--keepalive-interval");
exit(EXIT_FAILURE);
}
ctl->keepalive_interval = keepalive;
break;
case 'K':
if (virStrToLong_i(optarg, NULL, 0, &keepalive) < 0 ||
keepalive < 0) {
vshError(ctl, _("option -%s requires a positive numeric argument"),
longindex == -1 ? "-K" : "--keepalive-count");
exit(EXIT_FAILURE);
}
ctl->keepalive_count = keepalive;
break;
case 'l':
vshCloseLogFile(ctl);
ctl->logfile = vshStrdup(ctl, optarg);
vshOpenLogFile(ctl);
break;
case 'q':
ctl->quiet = true;
break;
case 't':
ctl->timing = true;
break;
case 'r':
ctl->readonly = true;
break;
case 'v':
if (STRNEQ_NULLABLE(optarg, "long")) {
puts(VERSION);
exit(EXIT_SUCCESS);
}
/* fall through */
case 'V':
vshShowVersion(ctl);
exit(EXIT_SUCCESS);
case ':':
for (i = 0; opt[i].name != NULL; i++) {
if (opt[i].val == optopt)
break;
}
if (opt[i].name)
vshError(ctl, _("option '-%c'/'--%s' requires an argument"),
optopt, opt[i].name);
else
vshError(ctl, _("option '-%c' requires an argument"), optopt);
exit(EXIT_FAILURE);
case '?':
if (optopt)
vshError(ctl, _("unsupported option '-%c'. See --help."), optopt);
else
vshError(ctl, _("unsupported option '%s'. See --help."), argv[optind - 1]);
exit(EXIT_FAILURE);
default:
vshError(ctl, _("unknown option"));
exit(EXIT_FAILURE);
}
longindex = -1;
}
if (argc > optind) {
/* parse command */
ctl->imode = false;
if (argc - optind == 1) {
vshDebug(ctl, VSH_ERR_INFO, "commands: \"%s\"\n", argv[optind]);
return vshCommandStringParse(ctl, argv[optind]);
} else {
return vshCommandArgvParse(ctl, argc - optind, argv + optind);
}
}
return true;
}
static const vshCmdDef virshCmds[] = {
{.name = "cd",
.handler = cmdCd,
.opts = opts_cd,
.info = info_cd,
.flags = VSH_CMD_FLAG_NOCONNECT
},
{.name = "connect",
.handler = cmdConnect,
.opts = opts_connect,
.info = info_connect,
.flags = VSH_CMD_FLAG_NOCONNECT
},
{.name = "echo",
.handler = cmdEcho,
.opts = opts_echo,
.info = info_echo,
.flags = VSH_CMD_FLAG_NOCONNECT
},
{.name = "exit",
.handler = cmdQuit,
.opts = NULL,
.info = info_quit,
.flags = VSH_CMD_FLAG_NOCONNECT
},
{.name = "help",
.handler = cmdHelp,
.opts = opts_help,
.info = info_help,
.flags = VSH_CMD_FLAG_NOCONNECT
},
{.name = "pwd",
.handler = cmdPwd,
.opts = NULL,
.info = info_pwd,
.flags = VSH_CMD_FLAG_NOCONNECT
},
{.name = "quit",
.handler = cmdQuit,
.opts = NULL,
.info = info_quit,
.flags = VSH_CMD_FLAG_NOCONNECT
},
{.name = NULL}
};
static const vshCmdGrp cmdGroups[] = {
{VSH_CMD_GRP_DOM_MANAGEMENT, "domain", domManagementCmds},
{VSH_CMD_GRP_DOM_MONITORING, "monitor", domMonitoringCmds},
{VSH_CMD_GRP_HOST_AND_HV, "host", hostAndHypervisorCmds},
{VSH_CMD_GRP_IFACE, "interface", ifaceCmds},
{VSH_CMD_GRP_NWFILTER, "filter", nwfilterCmds},
{VSH_CMD_GRP_NETWORK, "network", networkCmds},
{VSH_CMD_GRP_NODEDEV, "nodedev", nodedevCmds},
{VSH_CMD_GRP_SECRET, "secret", secretCmds},
{VSH_CMD_GRP_SNAPSHOT, "snapshot", snapshotCmds},
{VSH_CMD_GRP_STORAGE_POOL, "pool", storagePoolCmds},
{VSH_CMD_GRP_STORAGE_VOL, "volume", storageVolCmds},
{VSH_CMD_GRP_VIRSH, "virsh", virshCmds},
{NULL, NULL, NULL}
};
int
main(int argc, char **argv)
{
vshControl _ctl, *ctl = &_ctl;
const char *defaultConn;
bool ret = true;
memset(ctl, 0, sizeof(vshControl));
ctl->imode = true; /* default is interactive mode */
ctl->log_fd = -1; /* Initialize log file descriptor */
ctl->debug = VSH_DEBUG_DEFAULT;
ctl->escapeChar = "^]"; /* Same default as telnet */
/* In order to distinguish default from setting to 0 */
ctl->keepalive_interval = -1;
ctl->keepalive_count = -1;
ctl->eventPipe[0] = -1;
ctl->eventPipe[1] = -1;
ctl->eventTimerId = -1;
if (!setlocale(LC_ALL, "")) {
perror("setlocale");
/* failure to setup locale is not fatal */
}
if (!bindtextdomain(PACKAGE, LOCALEDIR)) {
perror("bindtextdomain");
return EXIT_FAILURE;
}
if (!textdomain(PACKAGE)) {
perror("textdomain");
return EXIT_FAILURE;
}
if (isatty(STDIN_FILENO)) {
ctl->istty = true;
#ifndef WIN32
if (tcgetattr(STDIN_FILENO, &ctl->termattr) < 0)
ctl->istty = false;
#endif
}
if (virMutexInit(&ctl->lock) < 0) {
vshError(ctl, "%s", _("Failed to initialize mutex"));
return EXIT_FAILURE;
}
if (virInitialize() < 0) {
vshError(ctl, "%s", _("Failed to initialize libvirt"));
return EXIT_FAILURE;
}
virFileActivateDirOverride(argv[0]);
if (!(progname = strrchr(argv[0], '/')))
progname = argv[0];
else
progname++;
if ((defaultConn = virGetEnvBlockSUID("VIRSH_DEFAULT_CONNECT_URI"))) {
ctl->name = vshStrdup(ctl, defaultConn);
}
vshInitDebug(ctl);
if (!vshParseArgv(ctl, argc, argv) ||
!vshInit(ctl)) {
vshDeinit(ctl);
exit(EXIT_FAILURE);
}
if (!ctl->imode) {
ret = vshCommandRun(ctl, ctl->cmd);
} else {
/* interactive mode */
if (!ctl->quiet) {
vshPrint(ctl,
_("Welcome to %s, the virtualization interactive terminal.\n\n"),
progname);
vshPrint(ctl, "%s",
_("Type: 'help' for help with commands\n"
" 'quit' to quit\n\n"));
}
if (vshReadlineInit(ctl) < 0) {
vshDeinit(ctl);
exit(EXIT_FAILURE);
}
do {
const char *prompt = ctl->readonly ? VSH_PROMPT_RO : VSH_PROMPT_RW;
ctl->cmdstr =
vshReadline(ctl, prompt);
if (ctl->cmdstr == NULL)
break; /* EOF */
if (*ctl->cmdstr) {
#if WITH_READLINE
add_history(ctl->cmdstr);
#endif
if (vshCommandStringParse(ctl, ctl->cmdstr))
vshCommandRun(ctl, ctl->cmd);
}
VIR_FREE(ctl->cmdstr);
} while (ctl->imode);
if (ctl->cmdstr == NULL)
fputc('\n', stdout); /* line break after alone prompt */
}
vshDeinit(ctl);
exit(ret ? EXIT_SUCCESS : EXIT_FAILURE);
}
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