qemu: Introduce qemuBuildSmartcardCommandLine

Add new function to manage adding the smartcard device options to the
command line removing that task from the mainline qemuBuildCommandLine.

Alter the logic slightly to make !nsmartcards check first so that remainder
of the code is less indented.
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>

src/qemu/qemu_command.c

@@ -4247,7 +4247,7 @@ qemuBuildSCSIHostdevDevStr(virDomainDefPtr def,
 static int
 qemuBuildChrChardevFileStr(virLogManagerPtr logManager,
                            virCommandPtr cmd,
-                           virDomainDefPtr def,
+                           const virDomainDef *def,
                            virBufferPtr buf,
                            const char *filearg, const char *fileval,
                            const char *appendarg, int appendval)
@@ -4298,7 +4298,7 @@ qemuBuildChrChardevFileStr(virLogManagerPtr logManager,
 static char *
 qemuBuildChrChardevStr(virLogManagerPtr logManager,
                        virCommandPtr cmd,
-                       virDomainDefPtr def,
+                       const virDomainDef *def,
                        const virDomainChrSourceDef *dev,
                        const char *alias,
                        virQEMUCapsPtr qemuCaps)
@@ -7506,6 +7506,124 @@ qemuBuildNetCommandLine(virCommandPtr cmd,
 }
 
 
+static int
+qemuBuildSmartcardCommandLine(virLogManagerPtr logManager,
+                              virCommandPtr cmd,
+                              const virDomainDef *def,
+                              virQEMUCapsPtr qemuCaps)
+{
+    size_t i;
+    virDomainSmartcardDefPtr smartcard;
+    char *devstr;
+    virBuffer opt = VIR_BUFFER_INITIALIZER;
+    const char *database;
+
+    if (!def->nsmartcards)
+        return 0;
+
+    smartcard = def->smartcards[0];
+
+    /* -device usb-ccid was already emitted along with other
+     * controllers.  For now, qemu handles only one smartcard.  */
+    if (def->nsmartcards > 1 ||
+        smartcard->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_CCID ||
+        smartcard->info.addr.ccid.controller != 0 ||
+        smartcard->info.addr.ccid.slot != 0) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                       _("this QEMU binary lacks multiple smartcard "
+                         "support"));
+        virBufferFreeAndReset(&opt);
+        return -1;
+    }
+
+    switch (smartcard->type) {
+    case VIR_DOMAIN_SMARTCARD_TYPE_HOST:
+        if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_CHARDEV) ||
+            !virQEMUCapsGet(qemuCaps, QEMU_CAPS_CCID_EMULATED)) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                           _("this QEMU binary lacks smartcard host "
+                             "mode support"));
+            return -1;
+        }
+
+        virBufferAddLit(&opt, "ccid-card-emulated,backend=nss-emulated");
+        break;
+
+    case VIR_DOMAIN_SMARTCARD_TYPE_HOST_CERTIFICATES:
+        if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_CHARDEV) ||
+            !virQEMUCapsGet(qemuCaps, QEMU_CAPS_CCID_EMULATED)) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                           _("this QEMU binary lacks smartcard host "
+                             "mode support"));
+            return -1;
+        }
+
+        virBufferAddLit(&opt, "ccid-card-emulated,backend=certificates");
+        for (i = 0; i < VIR_DOMAIN_SMARTCARD_NUM_CERTIFICATES; i++) {
+            if (strchr(smartcard->data.cert.file[i], ',')) {
+                virBufferFreeAndReset(&opt);
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                               _("invalid certificate name: %s"),
+                               smartcard->data.cert.file[i]);
+                return -1;
+            }
+            virBufferAsprintf(&opt, ",cert%zu=%s", i + 1,
+                              smartcard->data.cert.file[i]);
+        }
+        if (smartcard->data.cert.database) {
+            if (strchr(smartcard->data.cert.database, ',')) {
+                virBufferFreeAndReset(&opt);
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                               _("invalid database name: %s"),
+                               smartcard->data.cert.database);
+                return -1;
+            }
+            database = smartcard->data.cert.database;
+        } else {
+            database = VIR_DOMAIN_SMARTCARD_DEFAULT_DATABASE;
+        }
+        virBufferAsprintf(&opt, ",db=%s", database);
+        break;
+
+    case VIR_DOMAIN_SMARTCARD_TYPE_PASSTHROUGH:
+        if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_CHARDEV) ||
+            !virQEMUCapsGet(qemuCaps, QEMU_CAPS_CCID_PASSTHRU)) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                           _("this QEMU binary lacks smartcard "
+                             "passthrough mode support"));
+            return -1;
+        }
+
+        virCommandAddArg(cmd, "-chardev");
+        if (!(devstr = qemuBuildChrChardevStr(logManager, cmd, def,
+                                              &smartcard->data.passthru,
+                                              smartcard->info.alias,
+                                              qemuCaps))) {
+            virBufferFreeAndReset(&opt);
+            return -1;
+        }
+        virCommandAddArg(cmd, devstr);
+        VIR_FREE(devstr);
+
+        virBufferAsprintf(&opt, "ccid-card-passthru,chardev=char%s",
+                          smartcard->info.alias);
+        break;
+
+    default:
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("unexpected smartcard type %d"),
+                       smartcard->type);
+        virBufferFreeAndReset(&opt);
+        return -1;
+    }
+    virCommandAddArg(cmd, "-device");
+    virBufferAsprintf(&opt, ",id=%s,bus=ccid0.0", smartcard->info.alias);
+    virCommandAddArgBuffer(cmd, &opt);
+
+    return 0;
+}
+
+
 char *
 qemuBuildShmemDevStr(virDomainDefPtr def,
                      virDomainShmemDefPtr shmem,
@@ -8134,109 +8252,8 @@ qemuBuildCommandLine(virConnectPtr conn,
                                 &bootHostdevNet) < 0)
         goto error;
 
-    if (def->nsmartcards) {
-        /* -device usb-ccid was already emitted along with other
-         * controllers.  For now, qemu handles only one smartcard.  */
-        virDomainSmartcardDefPtr smartcard = def->smartcards[0];
-        char *devstr;
-        virBuffer opt = VIR_BUFFER_INITIALIZER;
-        const char *database;
-
-        if (def->nsmartcards > 1 ||
-            smartcard->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_CCID ||
-            smartcard->info.addr.ccid.controller != 0 ||
-            smartcard->info.addr.ccid.slot != 0) {
-            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
-                           _("this QEMU binary lacks multiple smartcard "
-                             "support"));
-            virBufferFreeAndReset(&opt);
-            goto error;
-        }
-
-        switch (smartcard->type) {
-        case VIR_DOMAIN_SMARTCARD_TYPE_HOST:
-            if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_CHARDEV) ||
-                !virQEMUCapsGet(qemuCaps, QEMU_CAPS_CCID_EMULATED)) {
-                virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
-                               _("this QEMU binary lacks smartcard host "
-                                 "mode support"));
-                goto error;
-            }
-
-            virBufferAddLit(&opt, "ccid-card-emulated,backend=nss-emulated");
-            break;
-
-        case VIR_DOMAIN_SMARTCARD_TYPE_HOST_CERTIFICATES:
-            if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_CHARDEV) ||
-                !virQEMUCapsGet(qemuCaps, QEMU_CAPS_CCID_EMULATED)) {
-                virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
-                               _("this QEMU binary lacks smartcard host "
-                                 "mode support"));
-                goto error;
-            }
-
-            virBufferAddLit(&opt, "ccid-card-emulated,backend=certificates");
-            for (j = 0; j < VIR_DOMAIN_SMARTCARD_NUM_CERTIFICATES; j++) {
-                if (strchr(smartcard->data.cert.file[j], ',')) {
-                    virBufferFreeAndReset(&opt);
-                    virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
-                                   _("invalid certificate name: %s"),
-                                   smartcard->data.cert.file[j]);
-                    goto error;
-                }
-                virBufferAsprintf(&opt, ",cert%zu=%s", j + 1,
-                                  smartcard->data.cert.file[j]);
-            }
-            if (smartcard->data.cert.database) {
-                if (strchr(smartcard->data.cert.database, ',')) {
-                    virBufferFreeAndReset(&opt);
-                    virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
-                                   _("invalid database name: %s"),
-                                   smartcard->data.cert.database);
-                    goto error;
-                }
-                database = smartcard->data.cert.database;
-            } else {
-                database = VIR_DOMAIN_SMARTCARD_DEFAULT_DATABASE;
-            }
-            virBufferAsprintf(&opt, ",db=%s", database);
-            break;
-
-        case VIR_DOMAIN_SMARTCARD_TYPE_PASSTHROUGH:
-            if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_CHARDEV) ||
-                !virQEMUCapsGet(qemuCaps, QEMU_CAPS_CCID_PASSTHRU)) {
-                virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
-                               _("this QEMU binary lacks smartcard "
-                                 "passthrough mode support"));
-                goto error;
-            }
-
-            if (!(devstr = qemuBuildChrChardevStr(logManager, cmd, def,
-                                                  &smartcard->data.passthru,
-                                                  smartcard->info.alias,
-                                                  qemuCaps))) {
-                virBufferFreeAndReset(&opt);
-                goto error;
-            }
-            virCommandAddArg(cmd, "-chardev");
-            virCommandAddArg(cmd, devstr);
-            VIR_FREE(devstr);
-
-            virBufferAsprintf(&opt, "ccid-card-passthru,chardev=char%s",
-                              smartcard->info.alias);
-            break;
-
-        default:
-            virReportError(VIR_ERR_INTERNAL_ERROR,
-                           _("unexpected smartcard type %d"),
-                           smartcard->type);
-            virBufferFreeAndReset(&opt);
+    if (qemuBuildSmartcardCommandLine(logManager, cmd, def, qemuCaps) < 0)
         goto error;
-        }
-        virCommandAddArg(cmd, "-device");
-        virBufferAsprintf(&opt, ",id=%s,bus=ccid0.0", smartcard->info.alias);
-        virCommandAddArgBuffer(cmd, &opt);
-    }
 
     if (def->nserials) {
         for (i = 0; i < def->ngraphics; i++) {