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32398e1282
We support to initialize the hooks at daemon reload if there is no hooks script is defined, we should also support initialize the hooks at daemon shutdown if no hooks is defined. To address bz: https://bugzilla.redhat.com/show_bug.cgi?id=688859
268 lines
7.2 KiB
C
268 lines
7.2 KiB
C
/*
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* hooks.c: implementation of the synchronous hooks support
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*
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* Copyright (C) 2010-2011 Red Hat, Inc.
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* Copyright (C) 2010 Daniel Veillard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Author: Daniel Veillard <veillard@redhat.com>
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*/
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#include <config.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "virterror_internal.h"
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#include "hooks.h"
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#include "util.h"
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#include "logging.h"
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#include "memory.h"
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#include "files.h"
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#include "configmake.h"
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#include "command.h"
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#define VIR_FROM_THIS VIR_FROM_HOOK
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#define virHookReportError(code, ...) \
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virReportErrorHelper(VIR_FROM_HOOK, code, __FILE__, \
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__FUNCTION__, __LINE__, __VA_ARGS__)
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#define LIBVIRT_HOOK_DIR SYSCONFDIR "/libvirt/hooks"
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VIR_ENUM_DECL(virHookDriver)
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VIR_ENUM_DECL(virHookDaemonOp)
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VIR_ENUM_DECL(virHookSubop)
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VIR_ENUM_DECL(virHookQemuOp)
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VIR_ENUM_DECL(virHookLxcOp)
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VIR_ENUM_IMPL(virHookDriver,
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VIR_HOOK_DRIVER_LAST,
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"daemon",
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"qemu",
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"lxc")
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VIR_ENUM_IMPL(virHookDaemonOp, VIR_HOOK_DAEMON_OP_LAST,
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"start",
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"shutdown",
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"reload")
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VIR_ENUM_IMPL(virHookSubop, VIR_HOOK_SUBOP_LAST,
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"-",
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"begin",
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"end")
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VIR_ENUM_IMPL(virHookQemuOp, VIR_HOOK_QEMU_OP_LAST,
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"start",
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"stopped",
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"prepare",
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"release")
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VIR_ENUM_IMPL(virHookLxcOp, VIR_HOOK_LXC_OP_LAST,
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"start",
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"stopped")
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static int virHooksFound = -1;
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/**
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* virHookCheck:
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* @driver: the driver name "daemon", "qemu", "lxc"...
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*
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* Check is there is an installed hook for the given driver, if this
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* is the case register it. Then subsequent calls to virHookCall
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* will call the hook if found.
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*
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* Returns 1 if found, 0 if not found, and -1 in case of error
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*/
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static int
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virHookCheck(int no, const char *driver) {
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char *path;
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int ret;
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if (driver == NULL) {
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virHookReportError(VIR_ERR_INTERNAL_ERROR,
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_("Invalid hook name for #%d"), no);
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return -1;
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}
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ret = virBuildPath(&path, LIBVIRT_HOOK_DIR, driver);
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if ((ret < 0) || (path == NULL)) {
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virHookReportError(VIR_ERR_INTERNAL_ERROR,
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_("Failed to build path for %s hook"),
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driver);
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return -1;
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}
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if (!virFileExists(path)) {
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ret = 0;
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VIR_DEBUG("No hook script %s", path);
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} else if (!virFileIsExecutable(path)) {
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ret = 0;
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VIR_WARN("Non-executable hook script %s", path);
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} else {
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ret = 1;
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VIR_DEBUG("Found hook script %s", path);
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}
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VIR_FREE(path);
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return ret;
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}
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/*
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* virHookInitialize:
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*
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* Initialize synchronous hooks support.
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* Check is there is an installed hook for all the drivers
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*
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* Returns the number of hooks found or -1 in case of failure
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*/
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int
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virHookInitialize(void) {
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int i, res, ret = 0;
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virHooksFound = 0;
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for (i = 0;i < VIR_HOOK_DRIVER_LAST;i++) {
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res = virHookCheck(i, virHookDriverTypeToString(i));
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if (res < 0)
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return(-1);
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if (res == 1) {
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virHooksFound |= (1 << i);
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ret++;
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}
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}
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return(ret);
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}
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/**
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* virHookPresent:
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* @driver: the driver number (from virHookDriver enum)
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*
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* Check if a hook exists for the given driver, this is needed
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* to avoid unnecessary work if the hook is not present
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*
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* Returns 1 if present, 0 otherwise
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*/
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int
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virHookPresent(int driver) {
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if ((driver < VIR_HOOK_DRIVER_DAEMON) ||
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(driver >= VIR_HOOK_DRIVER_LAST))
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return(0);
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if (virHooksFound == -1)
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return(0);
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if ((virHooksFound & (1 << driver)) == 0)
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return(0);
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return(1);
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}
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/*
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* virHookCall:
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* @driver: the driver number (from virHookDriver enum)
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* @id: an id for the object '-' if non available for example on daemon hooks
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* @op: the operation on the id e.g. VIR_HOOK_QEMU_OP_START
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* @sub_op: a sub_operation, currently unused
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* @extra: optional string information
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* @input: extra input given to the script on stdin
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*
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* Implement a hook call, where the external script for the driver is
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* called with the given information. This is a synchronous call, we wait for
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* execution completion
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*
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* Returns: 0 if the execution succeeded, 1 if the script was not found or
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* invalid parameters, and -1 if script returned an error
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*/
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int
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virHookCall(int driver, const char *id, int op, int sub_op, const char *extra,
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const char *input) {
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int ret;
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char *path;
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virCommandPtr cmd;
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const char *drvstr;
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const char *opstr;
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const char *subopstr;
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if ((driver < VIR_HOOK_DRIVER_DAEMON) ||
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(driver >= VIR_HOOK_DRIVER_LAST))
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return(1);
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/*
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* We cache the availability of the script to minimize impact at
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* runtime if no script is defined, this is being reset on SIGHUP
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*/
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if ((virHooksFound == -1) ||
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((driver == VIR_HOOK_DRIVER_DAEMON) &&
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(op == VIR_HOOK_DAEMON_OP_RELOAD ||
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op == VIR_HOOK_DAEMON_OP_SHUTDOWN)))
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virHookInitialize();
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if ((virHooksFound & (1 << driver)) == 0)
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return(1);
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drvstr = virHookDriverTypeToString(driver);
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opstr = NULL;
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switch (driver) {
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case VIR_HOOK_DRIVER_DAEMON:
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opstr = virHookDaemonOpTypeToString(op);
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break;
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case VIR_HOOK_DRIVER_QEMU:
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opstr = virHookQemuOpTypeToString(op);
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break;
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case VIR_HOOK_DRIVER_LXC:
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opstr = virHookLxcOpTypeToString(op);
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break;
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}
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if (opstr == NULL) {
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virHookReportError(VIR_ERR_INTERNAL_ERROR,
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_("Hook for %s, failed to find operation #%d"),
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drvstr, op);
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return(1);
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}
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subopstr = virHookSubopTypeToString(sub_op);
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if (subopstr == NULL)
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subopstr = "-";
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if (extra == NULL)
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extra = "-";
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ret = virBuildPath(&path, LIBVIRT_HOOK_DIR, drvstr);
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if ((ret < 0) || (path == NULL)) {
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virHookReportError(VIR_ERR_INTERNAL_ERROR,
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_("Failed to build path for %s hook"),
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drvstr);
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return(-1);
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}
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cmd = virCommandNewArgList(path, id, opstr, subopstr, extra, NULL);
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virCommandAddEnvPassCommon(cmd);
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if (input)
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virCommandSetInputBuffer(cmd, input);
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ret = virCommandRun(cmd, NULL);
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virCommandFree(cmd);
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VIR_FREE(path);
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return ret;
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}
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