qemu: convert to virCommand

* src/qemu/qemu_conf.c (qemudExtractVersionInfo): Check for file
before executing it here, rather than in callers.
(qemudBuildCommandLine): Rewrite with virCommand.
* src/qemu/qemu_conf.h (qemudBuildCommandLine): Update signature.
* src/qemu/qemu_driver.c (qemuAssignPCIAddresses)
(qemudStartVMDaemon, qemuDomainXMLToNative): Adjust callers.

src/qemu/qemu_conf.h

@@ -25,6 +25,7 @@
 # define __QEMUD_CONF_H
 
 # include <config.h>
+# include <stdbool.h>
 
 # include "ebtables.h"
 # include "internal.h"
@@ -41,6 +42,7 @@
 # include "driver.h"
 # include "bitmap.h"
 # include "macvtap.h"
+# include "command.h"
 
 # define qemudDebug(fmt, ...) do {} while(0)
 
@@ -228,16 +230,12 @@ int         qemudParseHelpStr           (const char *qemu,
                                          unsigned int *is_kvm,
                                          unsigned int *kvm_version);
 
-int         qemudBuildCommandLine       (virConnectPtr conn,
+virCommandPtr qemudBuildCommandLine     (virConnectPtr conn,
                                          struct qemud_driver *driver,
                                          virDomainDefPtr def,
                                          virDomainChrDefPtr monitor_chr,
-                                         int monitor_json,
+                                         bool monitor_json,
                                          unsigned long long qemuCmdFlags,
-                                         const char ***retargv,
-                                         const char ***retenv,
-                                         int **vmfds,
-                                         int *nvmfds,
                                          const char *migrateFrom,
                                          virDomainSnapshotObjPtr current_snapshot,
                                          enum virVMOperationType vmop)

src/qemu/qemu_driver.c

@@ -3025,14 +3025,6 @@ qemuAssignPCIAddresses(virDomainDefPtr def)
     int ret = -1;
     unsigned long long qemuCmdFlags = 0;
     qemuDomainPCIAddressSetPtr addrs = NULL;
-    struct stat sb;
-
-    if (stat(def->emulator, &sb) < 0) {
-        virReportSystemError(errno,
-                             _("Cannot find QEMU binary %s"),
-                             def->emulator);
-        goto cleanup;
-    }
 
     if (qemudExtractVersionInfo(def->emulator,
                                 NULL,
@@ -3873,30 +3865,21 @@ static int qemudStartVMDaemon(virConnectPtr conn,
                               int stdin_fd,
                               const char *stdin_path,
                               enum virVMOperationType vmop) {
-    const char **argv = NULL, **tmp;
-    const char **progenv = NULL;
-    int i, ret, runflags;
-    struct stat sb;
-    int *vmfds = NULL;
-    int nvmfds = 0;
+    int ret;
     unsigned long long qemuCmdFlags;
-    fd_set keepfd;
-    const char *emulator;
-    pid_t child;
     int pos = -1;
     char ebuf[1024];
     char *pidfile = NULL;
     int logfile = -1;
     char *timestamp;
     qemuDomainObjPrivatePtr priv = vm->privateData;
+    virCommandPtr cmd = NULL;
 
     struct qemudHookData hookData;
     hookData.conn = conn;
     hookData.vm = vm;
     hookData.driver = driver;
 
-    FD_ZERO(&keepfd);
-
     DEBUG0("Beginning VM startup process");
 
     if (virDomainObjIsActive(vm)) {
@@ -3987,21 +3970,8 @@ static int qemudStartVMDaemon(virConnectPtr conn,
     if ((logfile = qemudLogFD(driver, vm->def->name, false)) < 0)
         goto cleanup;
 
-    emulator = vm->def->emulator;
-
-    /* Make sure the binary we are about to try exec'ing exists.
-     * Technically we could catch the exec() failure, but that's
-     * in a sub-process so its hard to feed back a useful error
-     */
-    if (stat(emulator, &sb) < 0) {
-        virReportSystemError(errno,
-                             _("Cannot find QEMU binary %s"),
-                             emulator);
-        goto cleanup;
-    }
-
-    DEBUG0("Determing emulator version");
-    if (qemudExtractVersionInfo(emulator,
+    DEBUG0("Determining emulator version");
+    if (qemudExtractVersionInfo(vm->def->emulator,
                                 NULL,
                                 &qemuCmdFlags) < 0)
         goto cleanup;
@@ -4070,10 +4040,10 @@ static int qemudStartVMDaemon(virConnectPtr conn,
 
     DEBUG0("Building emulator command line");
     vm->def->id = driver->nextvmid++;
-    if (qemudBuildCommandLine(conn, driver, vm->def, priv->monConfig,
-                              priv->monJSON, qemuCmdFlags, &argv, &progenv,
-                              &vmfds, &nvmfds, migrateFrom,
-                              vm->current_snapshot, vmop) < 0)
+    if (!(cmd = qemudBuildCommandLine(conn, driver, vm->def, priv->monConfig,
+                                      priv->monJSON != 0, qemuCmdFlags,
+                                      migrateFrom,
+                                      vm->current_snapshot, vmop)))
         goto cleanup;
 
     if (qemuDomainSnapshotSetInactive(vm, driver->snapshotDir) < 0)
@@ -4108,50 +4078,28 @@ static int qemudStartVMDaemon(virConnectPtr conn,
         VIR_FREE(timestamp);
     }
 
-    tmp = progenv;
-
-    while (*tmp) {
-        if (safewrite(logfile, *tmp, strlen(*tmp)) < 0)
-            VIR_WARN("Unable to write envv to logfile: %s",
-                     virStrerror(errno, ebuf, sizeof ebuf));
-        if (safewrite(logfile, " ", 1) < 0)
-            VIR_WARN("Unable to write envv to logfile: %s",
-                     virStrerror(errno, ebuf, sizeof ebuf));
-        tmp++;
-    }
-    tmp = argv;
-    while (*tmp) {
-        if (safewrite(logfile, *tmp, strlen(*tmp)) < 0)
-            VIR_WARN("Unable to write argv to logfile: %s",
-                     virStrerror(errno, ebuf, sizeof ebuf));
-        if (safewrite(logfile, " ", 1) < 0)
-            VIR_WARN("Unable to write argv to logfile: %s",
-                     virStrerror(errno, ebuf, sizeof ebuf));
-        tmp++;
-    }
-    if (safewrite(logfile, "\n", 1) < 0)
-        VIR_WARN("Unable to write argv to logfile: %s",
-                 virStrerror(errno, ebuf, sizeof ebuf));
+    virCommandWriteArgLog(cmd, logfile);
 
     if ((pos = lseek(logfile, 0, SEEK_END)) < 0)
         VIR_WARN("Unable to seek to end of logfile: %s",
                  virStrerror(errno, ebuf, sizeof ebuf));
 
-    for (i = 0 ; i < nvmfds ; i++)
-        FD_SET(vmfds[i], &keepfd);
-
     VIR_DEBUG("Clear emulator capabilities: %d",
               driver->clearEmulatorCapabilities);
-    runflags = VIR_EXEC_NONBLOCK;
-    if (driver->clearEmulatorCapabilities) {
-        runflags |= VIR_EXEC_CLEAR_CAPS;
-    }
-
-    ret = virExecDaemonize(argv, progenv, &keepfd, &child,
-                           stdin_fd, &logfile, &logfile,
-                           runflags,
-                           qemudSecurityHook, &hookData,
-                           pidfile);
+    if (driver->clearEmulatorCapabilities)
+        virCommandClearCaps(cmd);
+
+    VIR_WARN("Executing %s", vm->def->emulator);
+    virCommandSetPreExecHook(cmd, qemudSecurityHook, &hookData);
+    virCommandSetInputFD(cmd, stdin_fd);
+    virCommandSetOutputFD(cmd, &logfile);
+    virCommandSetErrorFD(cmd, &logfile);
+    virCommandNonblockingFDs(cmd);
+    virCommandSetPidFile(cmd, pidfile);
+    virCommandDaemonize(cmd);
+
+    ret = virCommandRun(cmd, NULL);
+    VIR_WARN("Executing done %s", vm->def->emulator);
     VIR_FREE(pidfile);
 
     /* wait for qemu process to to show up */
@@ -4161,7 +4109,13 @@ static int qemudStartVMDaemon(virConnectPtr conn,
                             _("Domain %s didn't show up\n"), vm->def->name);
             ret = -1;
         }
+#if 0
     } else if (ret == -2) {
+        /*
+         * XXX this is bogus. It isn't safe to set vm->pid = child
+         * because the child no longer exists.
+         */
+
         /* The virExec process that launches the daemon failed. Pending on
          * when it failed (we can't determine for sure), there may be
          * extra info in the domain log (if the hook failed for example).
@@ -4171,30 +4125,16 @@ static int qemudStartVMDaemon(virConnectPtr conn,
          */
         vm->pid = child;
         ret = 0;
+#endif
     }
 
     if (migrateFrom)
         start_paused = true;
     vm->state = start_paused ? VIR_DOMAIN_PAUSED : VIR_DOMAIN_RUNNING;
 
-    for (i = 0 ; argv[i] ; i++)
-        VIR_FREE(argv[i]);
-    VIR_FREE(argv);
-
-    for (i = 0 ; progenv[i] ; i++)
-        VIR_FREE(progenv[i]);
-    VIR_FREE(progenv);
-
     if (ret == -1) /* The VM failed to start; tear filters before taps */
         virDomainConfVMNWFilterTeardown(vm);
 
-    if (vmfds) {
-        for (i = 0 ; i < nvmfds ; i++) {
-            VIR_FORCE_CLOSE(vmfds[i]);
-        }
-        VIR_FREE(vmfds);
-    }
-
     if (ret == -1) /* The VM failed to start */
         goto cleanup;
 
@@ -4248,6 +4188,7 @@ static int qemudStartVMDaemon(virConnectPtr conn,
     if (virDomainObjSetDefTransient(driver->caps, vm) < 0)
         goto cleanup;
 
+    virCommandFree(cmd);
     VIR_FORCE_CLOSE(logfile);
 
     return 0;
@@ -4256,9 +4197,9 @@ cleanup:
     /* We jump here if we failed to start the VM for any reason, or
      * if we failed to initialize the now running VM. kill it off and
      * pretend we never started it */
-    qemudShutdownVMDaemon(driver, vm, 0);
-
+    virCommandFree(cmd);
     VIR_FORCE_CLOSE(logfile);
+    qemudShutdownVMDaemon(driver, vm, 0);
 
     return -1;
 }
@@ -7331,13 +7272,8 @@ static char *qemuDomainXMLToNative(virConnectPtr conn,
     struct qemud_driver *driver = conn->privateData;
     virDomainDefPtr def = NULL;
     virDomainChrDef monConfig;
-    const char *emulator;
     unsigned long long qemuCmdFlags;
-    struct stat sb;
-    const char **retargv = NULL;
-    const char **retenv = NULL;
-    const char **tmp;
-    virBuffer buf = VIR_BUFFER_INITIALIZER;
+    virCommandPtr cmd = NULL;
     char *ret = NULL;
     int i;
 
@@ -7388,71 +7324,26 @@ static char *qemuDomainXMLToNative(virConnectPtr conn,
             def->graphics[i]->data.vnc.autoport)
             def->graphics[i]->data.vnc.port = QEMU_VNC_PORT_MIN;
     }
-    emulator = def->emulator;
-
-    /* Make sure the binary we are about to try exec'ing exists.
-     * Technically we could catch the exec() failure, but that's
-     * in a sub-process so its hard to feed back a useful error
-     */
-    if (stat(emulator, &sb) < 0) {
-        virReportSystemError(errno,
-                             _("Cannot find QEMU binary %s"),
-                             emulator);
-        goto cleanup;
-    }
 
-    if (qemudExtractVersionInfo(emulator,
+    if (qemudExtractVersionInfo(def->emulator,
                                 NULL,
-                                &qemuCmdFlags) < 0) {
-        qemuReportError(VIR_ERR_INTERNAL_ERROR,
-                        _("Cannot determine QEMU argv syntax %s"),
-                        emulator);
+                                &qemuCmdFlags) < 0)
         goto cleanup;
-    }
 
     if (qemuPrepareMonitorChr(driver, &monConfig, def->name) < 0)
         goto cleanup;
 
-    if (qemudBuildCommandLine(conn, driver, def,
-                              &monConfig, 0, qemuCmdFlags,
-                              &retargv, &retenv,
-                              NULL, NULL, /* Don't want it to create TAP devices */
-                              NULL, NULL,
-                              VIR_VM_OP_NO_OP) < 0) {
-        goto cleanup;
-    }
-
-    tmp = retenv;
-    while (*tmp) {
-        virBufferAdd(&buf, *tmp, strlen(*tmp));
-        virBufferAddLit(&buf, " ");
-        tmp++;
-    }
-    tmp = retargv;
-    while (*tmp) {
-        virBufferAdd(&buf, *tmp, strlen(*tmp));
-        virBufferAddLit(&buf, " ");
-        tmp++;
-    }
-
-    if (virBufferError(&buf)) {
-        virBufferFreeAndReset(&buf);
-        virReportOOMError();
+    if (!(cmd = qemudBuildCommandLine(conn, driver, def,
+                                      &monConfig, false, qemuCmdFlags,
+                                      NULL, NULL, VIR_VM_OP_NO_OP)))
         goto cleanup;
-    }
 
-    ret = virBufferContentAndReset(&buf);
+    ret = virCommandToString(cmd);
 
 cleanup:
     qemuDriverUnlock(driver);
-    for (tmp = retargv ; tmp && *tmp ; tmp++)
-        VIR_FREE(*tmp);
-    VIR_FREE(retargv);
-
-    for (tmp = retenv ; tmp && *tmp ; tmp++)
-        VIR_FREE(*tmp);
-    VIR_FREE(retenv);
 
+    virCommandFree(cmd);
     virDomainDefFree(def);
     return ret;
 }

tests/qemuxml2argvtest.c

@@ -27,29 +27,31 @@ static struct qemud_driver driver;
 # define MAX_FILE 4096
 
 static int testCompareXMLToArgvFiles(const char *xml,
-                                     const char *cmd,
+                                     const char *cmdline,
                                      unsigned long long extraFlags,
                                      const char *migrateFrom,
                                      bool expectError) {
     char argvData[MAX_FILE];
     char *expectargv = &(argvData[0]);
+    int len;
     char *actualargv = NULL;
-    const char **argv = NULL;
-    const char **qenv = NULL;
-    const char **tmp = NULL;
-    int ret = -1, len;
+    int ret = -1;
     unsigned long long flags;
     virDomainDefPtr vmdef = NULL;
     virDomainChrDef monitor_chr;
     virConnectPtr conn;
     char *log = NULL;
     char *emulator = NULL;
+    virCommandPtr cmd = NULL;
 
     if (!(conn = virGetConnect()))
         goto fail;
 
-    if (virtTestLoadFile(cmd, &expectargv, MAX_FILE) < 0)
+    len = virtTestLoadFile(cmdline, &expectargv, MAX_FILE);
+    if (len < 0)
         goto fail;
+    if (len && expectargv[len - 1] == '\n')
+        expectargv[len - 1] = '\0';
 
     if (!(vmdef = virDomainDefParseFile(driver.caps, xml,
                                         VIR_DOMAIN_XML_INACTIVE)))
@@ -109,11 +111,9 @@ static int testCompareXMLToArgvFiles(const char *xml,
     free(virtTestLogContentAndReset());
     virResetLastError();
 
-    if (qemudBuildCommandLine(conn, &driver,
-                              vmdef, &monitor_chr, 0, flags,
-                              &argv, &qenv,
-                              NULL, NULL, migrateFrom, NULL,
-                              VIR_VM_OP_CREATE) < 0)
+    if (!(cmd = qemudBuildCommandLine(conn, &driver,
+                                      vmdef, &monitor_chr, false, flags,
+                                      migrateFrom, NULL, VIR_VM_OP_CREATE)))
         goto fail;
 
     if (!!virGetLastError() != expectError) {
@@ -127,42 +127,17 @@ static int testCompareXMLToArgvFiles(const char *xml,
         virResetLastError();
     }
 
-    if (emulator && *argv) {
-        free(*(char**) argv);
-        *argv = emulator;
-        emulator = NULL;
-    }
-
-    len = 1; /* for trailing newline */
-    tmp = qenv;
-    while (*tmp) {
-        len += strlen(*tmp) + 1;
-        tmp++;
-    }
-
-    tmp = argv;
-    while (*tmp) {
-        len += strlen(*tmp) + 1;
-        tmp++;
-    }
-    if ((actualargv = malloc(sizeof(*actualargv)*len)) == NULL)
+    if (!(actualargv = virCommandToString(cmd)))
         goto fail;
-    actualargv[0] = '\0';
-    tmp = qenv;
-    while (*tmp) {
-        if (actualargv[0])
-            strcat(actualargv, " ");
-        strcat(actualargv, *tmp);
-        tmp++;
-    }
-    tmp = argv;
-    while (*tmp) {
-        if (actualargv[0])
-            strcat(actualargv, " ");
-        strcat(actualargv, *tmp);
-        tmp++;
+
+    if (emulator) {
+        /* Skip the abs_srcdir portion of replacement emulator.  */
+        char *start_skip = strstr(actualargv, abs_srcdir);
+        char *end_skip = strstr(actualargv, emulator);
+        if (!start_skip || !end_skip)
+            goto fail;
+        memmove(start_skip, end_skip, strlen(end_skip) + 1);
     }
-    strcat(actualargv, "\n");
 
     if (STRNEQ(expectargv, actualargv)) {
         virtTestDifference(stderr, expectargv, actualargv);
@@ -175,22 +150,7 @@ static int testCompareXMLToArgvFiles(const char *xml,
     free(log);
     free(emulator);
     free(actualargv);
-    if (argv) {
-        tmp = argv;
-        while (*tmp) {
-            free(*(char**)tmp);
-            tmp++;
-        }
-        free(argv);
-    }
-    if (qenv) {
-        tmp = qenv;
-        while (*tmp) {
-            free(*(char**)tmp);
-            tmp++;
-        }
-        free(qenv);
-    }
+    virCommandFree(cmd);
     virDomainDefFree(vmdef);
     virUnrefConnect(conn);
     return ret;