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[libvirt] [PATCH] virsh: Check for existence of storage before undefining the domain



When undefining a domain and removing associated storage using "virsh
undefine --storage" the domain was at first undefined and after that the
storage removal proces was started. If the user specified an invalid
disk to remove, the error could not be corrected.

This patch moves enumeration and filtering of volumes that should be
removed before the domain is undefined, but the removal process is still
kept after the domain has been undefined.
---
 tools/virsh.c |  280 +++++++++++++++++++++++++++++----------------------------
 1 files changed, 144 insertions(+), 136 deletions(-)

diff --git a/tools/virsh.c b/tools/virsh.c
index 0354822..e6b8e5f 100644
--- a/tools/virsh.c
+++ b/tools/virsh.c
@@ -3007,6 +3007,12 @@ static const vshCmdOptDef opts_undefine[] = {
     {NULL, 0, 0, NULL}
 };

+typedef struct {
+    virStorageVolPtr vol;
+    char *source;
+    char *target;
+} vshUndefineVolume;
+
 static bool
 cmdUndefine(vshControl *ctl, const vshCmd *cmd)
 {
@@ -3019,7 +3025,6 @@ cmdUndefine(vshControl *ctl, const vshCmd *cmd)
     bool managed_save = vshCommandOptBool(cmd, "managed-save");
     bool snapshots_metadata = vshCommandOptBool(cmd, "snapshots-metadata");
     bool wipe_storage = vshCommandOptBool(cmd, "wipe-storage");
-    bool remove_storage = false;
     bool remove_all_storage = vshCommandOptBool(cmd, "remove-all-storage");
     /* Positive if these items exist.  */
     int has_managed_save = 0;
@@ -3031,6 +3036,8 @@ cmdUndefine(vshControl *ctl, const vshCmd *cmd)
     int rc = -1;
     int running;
     /* list of volumes to remove along with this domain */
+    vshUndefineVolume *vlist = NULL;
+    int nvols = 0;
     const char *volumes_arg = NULL;
     char *volumes = NULL;
     char **volume_tokens = NULL;
@@ -3045,8 +3052,10 @@ cmdUndefine(vshControl *ctl, const vshCmd *cmd)
     xmlXPathContextPtr ctxt = NULL;
     xmlNodePtr *vol_nodes = NULL;
     int nvolumes = 0;
-    virStorageVolPtr vol = NULL;
-    bool vol_del_failed = false;
+    bool vol_not_found = false;
+
+    ignore_value(vshCommandOptString(cmd, "storage", &volumes_arg));
+    volumes = vshStrdup(ctl, volumes_arg);

     if (managed_save) {
         flags |= VIR_DOMAIN_UNDEFINE_MANAGED_SAVE;
@@ -3063,36 +3072,21 @@ cmdUndefine(vshControl *ctl, const vshCmd *cmd)
     if (!(dom = vshCommandOptDomain(ctl, cmd, &name)))
         return false;

-    /* check if a string that should contain list of volumes to remove is present */
-    if (vshCommandOptString(cmd, "storage", &volumes_arg) > 0) {
-        volumes = vshStrdup(ctl, volumes_arg);
-
-        if (remove_all_storage) {
-            vshError(ctl, _("Specified both --storage and --remove-all-storage"));
-            goto cleanup;
-        }
-        remove_storage = true;
-   }
-
     /* Do some flag manipulation.  The goal here is to disable bits
      * from flags to reduce the likelihood of a server rejecting
      * unknown flag bits, as well as to track conditions which are
      * safe by default for the given hypervisor and server version.  */
-    running = virDomainIsActive(dom);
-    if (running < 0) {
-        virshReportError(ctl);
-        goto cleanup;
-    }
+    if ((running = virDomainIsActive(dom)) < 0)
+        goto error;
+
     if (!running) {
         /* Undefine with snapshots only fails for inactive domains,
          * and managed save only exists on inactive domains; if
          * running, then we don't want to remove anything.  */
         has_managed_save = virDomainHasManagedSaveImage(dom, 0);
         if (has_managed_save < 0) {
-            if (last_error->code != VIR_ERR_NO_SUPPORT) {
-                virshReportError(ctl);
-                goto cleanup;
-            }
+            if (last_error->code != VIR_ERR_NO_SUPPORT)
+                goto error;
             virFreeError(last_error);
             last_error = NULL;
             has_managed_save = 0;
@@ -3100,10 +3094,8 @@ cmdUndefine(vshControl *ctl, const vshCmd *cmd)

         has_snapshots = virDomainSnapshotNum(dom, 0);
         if (has_snapshots < 0) {
-            if (last_error->code != VIR_ERR_NO_SUPPORT) {
-                virshReportError(ctl);
-                goto cleanup;
-            }
+            if (last_error->code != VIR_ERR_NO_SUPPORT)
+                goto error;
             virFreeError(last_error);
             last_error = NULL;
             has_snapshots = 0;
@@ -3137,16 +3129,116 @@ cmdUndefine(vshControl *ctl, const vshCmd *cmd)
     }

     /* Stash domain description for later use */
-    if (remove_storage || remove_all_storage) {
+    if (volumes || remove_all_storage) {
         if (running) {
             vshError(ctl, _("Storage volume deletion is supported only on stopped domains"));
             goto cleanup;
         }

+        if (volumes && remove_all_storage) {
+            vshError(ctl, _("Specified both --storage and --remove-all-storage"));
+            goto cleanup;
+        }
+
         if (!(def = virDomainGetXMLDesc(dom, 0))) {
             vshError(ctl, _("Could not retrieve domain XML description"));
             goto cleanup;
         }
+
+        if (!(doc = virXMLParseStringCtxt(def, _("(domain_definition)"),
+                                          &ctxt)))
+            goto error;
+
+        /* tokenize the string from user and save it's parts into an array */
+        if (volumes) {
+            /* count the delimiters */
+            volume_tok = volumes;
+            nvolume_tokens = 1; /* we need at least one member */
+            while (*volume_tok) {
+                if (*(volume_tok++) == ',')
+                    nvolume_tokens++;
+            }
+
+            volume_tokens = vshCalloc(ctl, nvolume_tokens, sizeof(char *));
+
+            /* tokenize the input string */
+            nvolume_tokens = 0;
+            volume_tok = volumes;
+            do {
+                volume_tokens[nvolume_tokens] = strsep(&volume_tok, ",");
+                nvolume_tokens++;
+            } while (volume_tok);
+        }
+
+        if ((nvolumes = virXPathNodeSet("./devices/disk", ctxt,
+                                        &vol_nodes)) < 0)
+            goto error;
+
+        if (nvolumes > 0)
+            vlist = vshCalloc(ctl, nvolumes, sizeof(*vlist));
+
+        for (vol_i = 0; vol_i < nvolumes; vol_i++) {
+            ctxt->node = vol_nodes[vol_i];
+
+            /* get volume source and target paths */
+            if (!(target = virXPathString("string(./target/@dev)", ctxt)))
+                goto error;
+
+            if (!(source = virXPathString("string("
+                                          "./source/@file|"
+                                          "./source/@dir|"
+                                          "./source/@name|"
+                                          "./source/@dev)", ctxt))) {
+                if (last_error && last_error->code != VIR_ERR_OK)
+                    goto error;
+                else
+                    continue;
+            }
+
+            /* lookup if volume was selected by user */
+            if (volumes) {
+                volume_tok = NULL;
+                for (tok_i = 0; tok_i < nvolume_tokens; tok_i++) {
+                    if (volume_tokens[tok_i] &&
+                        (STREQ(volume_tokens[tok_i], target) ||
+                         STREQ(volume_tokens[tok_i], source))) {
+                        volume_tok = volume_tokens[tok_i];
+                        volume_tokens[tok_i] = NULL;
+                        break;
+                    }
+                }
+                if (!volume_tok)
+                    continue;
+            }
+
+            if (!(vlist[nvols].vol = virStorageVolLookupByPath(ctl->conn,
+                                                               source))) {
+                vshPrint(ctl,
+                         _("Storage volume '%s'(%s) is not managed by libvirt. "
+                           "Remove it manually.\n"), target, source);
+                virFreeError(last_error);
+                last_error = NULL;
+                continue;
+            }
+            vlist[nvols].source = source;
+            vlist[nvols].target = target;
+            nvols++;
+        }
+
+        /* print volumes specified by user that were not found in domain definition */
+        if (volumes) {
+            for (tok_i = 0; tok_i < nvolume_tokens; tok_i++) {
+                if (volume_tokens[tok_i]) {
+                    vshError(ctl, _("Volume '%s' was not found in domain's "
+                                    "definition.\n"),
+                             volume_tokens[tok_i]);
+                    vol_not_found = true;
+                }
+            }
+
+            if (vol_not_found)
+                goto cleanup;
+        }
     }

     /* Generally we want to try the new API first.  However, while
@@ -3202,96 +3294,15 @@ out:
     }

     /* try to undefine storage volumes associated with this domain, if it's requested */
-    if (remove_storage || remove_all_storage) {
-        ret = false;
-
-        /* tokenize the string from user and save it's parts into an array */
-        if (volumes) {
-            /* count the delimiters */
-            volume_tok = volumes;
-            nvolume_tokens = 1; /* we need at least one member */
-            while (*volume_tok) {
-                if (*volume_tok == ',')
-                    nvolume_tokens++;
-                volume_tok++;
-            }
-
-            volume_tokens = vshCalloc(ctl, nvolume_tokens,  sizeof(char *));
-
-            /* tokenize the input string */
-            nvolume_tokens = 0;
-            volume_tok = volumes;
-            do {
-                volume_tokens[nvolume_tokens] = strsep(&volume_tok, ",");
-                nvolume_tokens++;
-            } while (volume_tok);
-        }
-
-        doc = virXMLParseStringCtxt(def, _("(domain_definition)"), &ctxt);
-        if (!doc)
-            goto cleanup;
-
-        nvolumes = virXPathNodeSet("./devices/disk", ctxt, &vol_nodes);
-
-        if (nvolumes < 0)
-            goto cleanup;
-
-        for (vol_i = 0; vol_i < nvolumes; vol_i++) {
-            ctxt->node = vol_nodes[vol_i];
-            VIR_FREE(target);
-            VIR_FREE(source);
-            if (vol) {
-                virStorageVolFree(vol);
-                vol = NULL;
-            }
-
-            /* get volume source and target paths */
-            if (!(target = virXPathString("string(./target/@dev)", ctxt))) {
-                vshError(ctl, _("Failed to enumerate devices"));
-                goto cleanup;
-            }
-
-            if (!(source = virXPathString("string("
-                                          "./source/@file|"
-                                          "./source/@dir|"
-                                          "./source/@name|"
-                                          "./source/@dev)", ctxt)) &&
-                virGetLastError())
-                goto cleanup;
-
-            /* lookup if volume was selected by user */
-            if (volumes) {
-                volume_tok = NULL;
-                for (tok_i = 0; tok_i < nvolume_tokens; tok_i++) {
-                    if (volume_tokens[tok_i] &&
-                        (STREQ_NULLABLE(volume_tokens[tok_i], target) ||
-                         STREQ_NULLABLE(volume_tokens[tok_i], source))) {
-                        volume_tok = volume_tokens[tok_i];
-                        volume_tokens[tok_i] = NULL;
-                        break;
-                    }
-                }
-                if (!volume_tok)
-                    continue;
-            }
-
-            if (!source)
-                continue;
-
-            if (!(vol = virStorageVolLookupByPath(ctl->conn, source))) {
-                vshPrint(ctl,
-                         _("Storage volume '%s'(%s) is not managed by libvirt. "
-                           "Remove it manually.\n"), target, source);
-                virResetLastError();
-                continue;
-            }
-
+    if (nvols) {
+        for (vol_i = 0; vol_i < nvols; vol_i++) {
             if (wipe_storage) {
-                vshPrint(ctl, _("Wiping volume '%s'(%s) ... "), target, source);
+                vshPrint(ctl, _("Wiping volume '%s'(%s) ... "),
+                         vlist[vol_i].target, vlist[vol_i].source);
                 fflush(stdout);
-                if (virStorageVolWipe(vol, 0) < 0) {
+                if (virStorageVolWipe(vlist[vol_i].vol, 0) < 0) {
                     vshError(ctl, _("Failed! Volume not removed."));
-                    vol_del_failed = true;
+                    ret = false;
                     continue;
                 } else {
                     vshPrint(ctl, _("Done.\n"));
@@ -3299,41 +3310,38 @@ out:
             }

             /* delete the volume */
-            if (virStorageVolDelete(vol, 0) < 0) {
+            if (virStorageVolDelete(vlist[vol_i].vol, 0) < 0) {
                 vshError(ctl, _("Failed to remove storage volume '%s'(%s)"),
-                         target, source);
-                vol_del_failed = true;
-            }
-            vshPrint(ctl, _("Volume '%s' removed.\n"), volume_tok?volume_tok:source);
-        }
-
-        /* print volumes specified by user that were not found in domain definition */
-        if (volumes) {
-            for (tok_i = 0; tok_i < nvolume_tokens; tok_i++) {
-                if (volume_tokens[tok_i])
-                    vshPrint(ctl, _("Volume '%s' was not found in domain's "
-                                    "definition.\n"),
-                             volume_tokens[tok_i]);
+                         vlist[vol_i].target, vlist[vol_i].source);
+                ret = false;
+            } else {
+                vshPrint(ctl, _("Volume '%s'(%s) removed.\n"),
+                         vlist[vol_i].target, vlist[vol_i].source);
             }
         }
-
-        if (!vol_del_failed)
-            ret = true;
     }

 cleanup:
-    VIR_FREE(source);
-    VIR_FREE(target);
+    for (vol_i = 0; vol_i < nvols; vol_i++) {
+        VIR_FREE(vlist[vol_i].source);
+        VIR_FREE(vlist[vol_i].target);
+        if (vlist[vol_i].vol)
+            virStorageVolFree(vlist[vol_i].vol);
+    }
+    VIR_FREE(vlist);
+
     VIR_FREE(volumes);
     VIR_FREE(volume_tokens);
     VIR_FREE(def);
     VIR_FREE(vol_nodes);
-    if (vol)
-        virStorageVolFree(vol);
     xmlFreeDoc(doc);
     xmlXPathFreeContext(ctxt);
     virDomainFree(dom);
     return ret;
+
+error:
+    virshReportError(ctl);
+    goto cleanup;
 }


-- 
1.7.8.6


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