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qemu: convert capabilities to use virCommand
* src/qemu/qemu_capabilities.c (qemuCapsProbeMachineTypes) (qemuCapsProbeCPUModels, qemuCapsParsePCIDeviceStrs) (qemuCapsExtractVersionInfo): Use virCommand rather than virExec.
This commit is contained in:
Eric Blake
parent
6935a1e289
commit
221151813c
@ -1,7 +1,7 @@
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/*
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* qemu_capabilities.c: QEMU capabilities generation
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*
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* Copyright (C) 2006-2007, 2009-2010 Red Hat, Inc.
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* Copyright (C) 2006-2011 Red Hat, Inc.
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* Copyright (C) 2006 Daniel P. Berrange
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*
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* This library is free software; you can redistribute it and/or
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@ -33,6 +33,7 @@
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#include "cpu/cpu.h"
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#include "domain_conf.h"
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#include "qemu_conf.h"
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#include "command.h"
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#include <sys/stat.h>
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#include <unistd.h>
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@ -167,52 +168,26 @@ qemuCapsProbeMachineTypes(const char *binary,
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virCapsGuestMachinePtr **machines,
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int *nmachines)
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{
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const char *const qemuarg[] = { binary, "-M", "?", NULL };
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const char *const qemuenv[] = { "LC_ALL=C", NULL };
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char *output;
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enum { MAX_MACHINES_OUTPUT_SIZE = 1024*4 };
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pid_t child;
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int newstdout = -1, len;
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int ret = -1, status;
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int ret = -1;
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virCommandPtr cmd;
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if (virExec(qemuarg, qemuenv, NULL,
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&child, -1, &newstdout, NULL, VIR_EXEC_CLEAR_CAPS) < 0)
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return -1;
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cmd = virCommandNewArgList(binary, "-M", "?", NULL);
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virCommandAddEnvPassCommon(cmd);
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virCommandSetOutputBuffer(cmd, &output);
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virCommandClearCaps(cmd);
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len = virFileReadLimFD(newstdout, MAX_MACHINES_OUTPUT_SIZE, &output);
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if (len < 0) {
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virReportSystemError(errno, "%s",
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_("Unable to read 'qemu -M ?' output"));
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if (virCommandRun(cmd, NULL) < 0)
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goto cleanup;
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}
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if (qemuCapsParseMachineTypesStr(output, machines, nmachines) < 0)
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goto cleanup2;
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goto cleanup;
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ret = 0;
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cleanup2:
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VIR_FREE(output);
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cleanup:
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if (VIR_CLOSE(newstdout) < 0)
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ret = -1;
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rewait:
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if (waitpid(child, &status, 0) != child) {
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if (errno == EINTR)
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goto rewait;
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VIR_ERROR(_("Unexpected exit status from qemu %d pid %lu"),
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WEXITSTATUS(status), (unsigned long)child);
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ret = -1;
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}
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/* Check & log unexpected exit status, but don't fail,
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* as there's really no need to throw an error if we did
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* actually read a valid version number above */
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if (WEXITSTATUS(status) != 0) {
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VIR_WARN("Unexpected exit status '%d', qemu probably failed",
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WEXITSTATUS(status));
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}
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VIR_FREE(output);
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virCommandFree(cmd);
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return ret;
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}
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@ -396,21 +371,10 @@ qemuCapsProbeCPUModels(const char *qemu,
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unsigned int *count,
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const char ***cpus)
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{
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const char *const qemuarg[] = {
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qemu,
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"-cpu", "?",
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(qemuCmdFlags & QEMUD_CMD_FLAG_NODEFCONFIG) ? "-nodefconfig" : NULL,
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NULL
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};
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const char *const qemuenv[] = { "LC_ALL=C", NULL };
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enum { MAX_MACHINES_OUTPUT_SIZE = 1024*4 };
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char *output = NULL;
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int newstdout = -1;
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int ret = -1;
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pid_t child;
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int status;
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int len;
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qemuCapsParseCPUModels parse;
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virCommandPtr cmd;
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if (count)
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*count = 0;
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@ -424,16 +388,15 @@ qemuCapsProbeCPUModels(const char *qemu,
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return 0;
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}
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if (virExec(qemuarg, qemuenv, NULL,
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&child, -1, &newstdout, NULL, VIR_EXEC_CLEAR_CAPS) < 0)
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return -1;
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cmd = virCommandNewArgList(qemu, "-cpu", "?", NULL);
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if (qemuCmdFlags & QEMUD_CMD_FLAG_NODEFCONFIG)
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virCommandAddArg(cmd, "-nodefconfig");
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virCommandAddEnvPassCommon(cmd);
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virCommandSetOutputBuffer(cmd, &output);
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virCommandClearCaps(cmd);
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len = virFileReadLimFD(newstdout, MAX_MACHINES_OUTPUT_SIZE, &output);
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if (len < 0) {
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virReportSystemError(errno, "%s",
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_("Unable to read QEMU supported CPU models"));
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if (virCommandRun(cmd, NULL) < 0)
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goto cleanup;
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}
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if (parse(output, count, cpus) < 0) {
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virReportOOMError();
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@ -444,25 +407,7 @@ qemuCapsProbeCPUModels(const char *qemu,
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cleanup:
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VIR_FREE(output);
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if (VIR_CLOSE(newstdout) < 0)
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ret = -1;
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rewait:
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if (waitpid(child, &status, 0) != child) {
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if (errno == EINTR)
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goto rewait;
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VIR_ERROR(_("Unexpected exit status from qemu %d pid %lu"),
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WEXITSTATUS(status), (unsigned long)child);
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ret = -1;
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}
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/* Check & log unexpected exit status, but don't fail,
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* as there's really no need to throw an error if we did
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* actually read a valid version number above */
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if (WEXITSTATUS(status) != 0) {
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VIR_WARN("Unexpected exit status '%d', qemu probably failed",
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WEXITSTATUS(status));
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}
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virCommandFree(cmd);
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return ret;
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}
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@ -1091,57 +1036,35 @@ static void
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qemuCapsParsePCIDeviceStrs(const char *qemu,
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unsigned long long *flags)
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{
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const char *const qemuarg[] = { qemu, "-device", "pci-assign,?", NULL };
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const char *const qemuenv[] = { "LC_ALL=C", NULL };
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pid_t child;
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int status;
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int newstderr = -1;
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if (virExec(qemuarg, qemuenv, NULL,
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&child, -1, NULL, &newstderr, VIR_EXEC_CLEAR_CAPS) < 0)
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return;
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char *pciassign = NULL;
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enum { MAX_PCI_OUTPUT_SIZE = 1024*4 };
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int len = virFileReadLimFD(newstderr, MAX_PCI_OUTPUT_SIZE, &pciassign);
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if (len < 0) {
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virReportSystemError(errno,
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_("Unable to read %s pci-assign device output"),
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qemu);
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virCommandPtr cmd;
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cmd = virCommandNewArgList(qemu, "-device", "pci-assign,?", NULL);
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virCommandAddEnvPassCommon(cmd);
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/* qemu -help goes to stdout, but qemu -device ? goes to stderr. */
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virCommandSetErrorBuffer(cmd, &pciassign);
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virCommandClearCaps(cmd);
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if (virCommandRun(cmd, NULL) < 0)
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goto cleanup;
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}
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if (strstr(pciassign, "pci-assign.configfd"))
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*flags |= QEMUD_CMD_FLAG_PCI_CONFIGFD;
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cleanup:
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VIR_FREE(pciassign);
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VIR_FORCE_CLOSE(newstderr);
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rewait:
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if (waitpid(child, &status, 0) != child) {
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if (errno == EINTR)
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goto rewait;
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VIR_ERROR(_("Unexpected exit status from qemu %d pid %lu"),
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WEXITSTATUS(status), (unsigned long)child);
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}
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if (WEXITSTATUS(status) != 0) {
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VIR_WARN("Unexpected exit status '%d', qemu probably failed",
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WEXITSTATUS(status));
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}
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virCommandFree(cmd);
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}
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int qemuCapsExtractVersionInfo(const char *qemu,
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unsigned int *retversion,
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unsigned long long *retflags)
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{
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const char *const qemuarg[] = { qemu, "-help", NULL };
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const char *const qemuenv[] = { "LC_ALL=C", NULL };
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pid_t child;
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int newstdout = -1;
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int ret = -1, status;
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int ret = -1;
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unsigned int version, is_kvm, kvm_version;
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unsigned long long flags = 0;
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char *help = NULL;
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virCommandPtr cmd;
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if (retflags)
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*retflags = 0;
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@ -1157,22 +1080,17 @@ int qemuCapsExtractVersionInfo(const char *qemu,
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return -1;
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}
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if (virExec(qemuarg, qemuenv, NULL,
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&child, -1, &newstdout, NULL, VIR_EXEC_CLEAR_CAPS) < 0)
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return -1;
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cmd = virCommandNewArgList(qemu, "-help", NULL);
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virCommandAddEnvPassCommon(cmd);
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virCommandSetOutputBuffer(cmd, &help);
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virCommandClearCaps(cmd);
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char *help = NULL;
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enum { MAX_HELP_OUTPUT_SIZE = 1024*64 };
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int len = virFileReadLimFD(newstdout, MAX_HELP_OUTPUT_SIZE, &help);
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if (len < 0) {
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virReportSystemError(errno,
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_("Unable to read %s help output"), qemu);
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goto cleanup2;
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}
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if (virCommandRun(cmd, NULL) < 0)
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goto cleanup;
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if (qemuCapsParseHelpStr(qemu, help, &flags,
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&version, &is_kvm, &kvm_version) == -1)
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goto cleanup2;
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goto cleanup;
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if (flags & QEMUD_CMD_FLAG_DEVICE)
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qemuCapsParsePCIDeviceStrs(qemu, &flags);
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@ -1184,27 +1102,9 @@ int qemuCapsExtractVersionInfo(const char *qemu,
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ret = 0;
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cleanup2:
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cleanup:
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VIR_FREE(help);
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if (VIR_CLOSE(newstdout) < 0)
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ret = -1;
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rewait:
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if (waitpid(child, &status, 0) != child) {
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if (errno == EINTR)
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goto rewait;
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VIR_ERROR(_("Unexpected exit status from qemu %d pid %lu"),
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WEXITSTATUS(status), (unsigned long)child);
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ret = -1;
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}
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/* Check & log unexpected exit status, but don't fail,
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* as there's really no need to throw an error if we did
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* actually read a valid version number above */
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if (WEXITSTATUS(status) != 0) {
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VIR_WARN("Unexpected exit status '%d', qemu probably failed",
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WEXITSTATUS(status));
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}
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virCommandFree(cmd);
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return ret;
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}
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