From c64b72d5c96a79b141f59a6ca7412cef10b18325 Mon Sep 17 00:00:00 2001
Message-Id: <c64b72d5c96a79b141f59a6ca7412cef10b18325@dist-git>
From: Peter Krempa <pkrempa@redhat.com>
Date: Wed, 26 Feb 2014 14:54:47 +0100
Subject: [PATCH] snapshot: conf: Use common parsing and formatting functions
 for source

https://bugzilla.redhat.com/show_bug.cgi?id=1032370

Disk source elements for snapshots were using separate code from our
config parser. As snapshots can be stored on more than just regular
files, we will need the universal parser to allow us to expose a variety
of snapshot disk targets. This patch reuses the config parsers and
formatters to do the job.

This initial support only changes the code without any visible XML
change.

(cherry picked from commit 43f2ccdc73090bd03f64de4d58d46ffa0134d705)

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
---
 src/conf/snapshot_conf.c | 67 ++++++++++++++++++++++++++++++++----------------
 src/conf/snapshot_conf.h |  1 +
 2 files changed, 46 insertions(+), 22 deletions(-)

diff --git a/src/conf/snapshot_conf.c b/src/conf/snapshot_conf.c
index 2a52418..29e12b7 100644
--- a/src/conf/snapshot_conf.c
+++ b/src/conf/snapshot_conf.c
@@ -128,27 +128,42 @@ virDomainSnapshotDiskDefParseXML(xmlNodePtr node,
         }
     }
 
-    cur = node->children;
-    while (cur) {
-        if (cur->type == XML_ELEMENT_NODE) {
-            if (!def->file &&
-                xmlStrEqual(cur->name, BAD_CAST "source")) {
-                def->file = virXMLPropString(cur, "file");
-            } else if (!def->format &&
-                       xmlStrEqual(cur->name, BAD_CAST "driver")) {
-                char *driver = virXMLPropString(cur, "type");
-                def->format = virStorageFileFormatTypeFromString(driver);
-                if (def->format <= 0) {
-                    virReportError(VIR_ERR_INTERNAL_ERROR,
-                                   _("unknown disk snapshot driver '%s'"),
-                                   driver);
-                    VIR_FREE(driver);
-                    goto cleanup;
-                }
+    def->type = -1;
+
+    for (cur = node->children; cur; cur = cur->next) {
+        if (cur->type != XML_ELEMENT_NODE)
+            continue;
+
+        if (!def->file &&
+            xmlStrEqual(cur->name, BAD_CAST "source")) {
+
+            int backingtype = def->type;
+
+            if (backingtype < 0)
+                backingtype = VIR_DOMAIN_DISK_TYPE_FILE;
+
+            if (virDomainDiskSourceDefParse(cur,
+                                            backingtype,
+                                            &def->file,
+                                            NULL,
+                                            NULL,
+                                            NULL,
+                                            NULL) < 0)
+                goto cleanup;
+
+        } else if (!def->format &&
+                   xmlStrEqual(cur->name, BAD_CAST "driver")) {
+            char *driver = virXMLPropString(cur, "type");
+            def->format = virStorageFileFormatTypeFromString(driver);
+            if (def->format <= 0) {
+                virReportError(VIR_ERR_INTERNAL_ERROR,
+                               _("unknown disk snapshot driver '%s'"),
+                               driver);
                 VIR_FREE(driver);
+                goto cleanup;
             }
+            VIR_FREE(driver);
         }
-        cur = cur->next;
     }
 
     if (!def->snapshot && (def->file || def->format))
@@ -540,6 +555,8 @@ static void
 virDomainSnapshotDiskDefFormat(virBufferPtr buf,
                                virDomainSnapshotDiskDefPtr disk)
 {
+    int type = disk->type;
+
     if (!disk->name)
         return;
 
@@ -547,6 +564,10 @@ virDomainSnapshotDiskDefFormat(virBufferPtr buf,
     if (disk->snapshot > 0)
         virBufferAsprintf(buf, " snapshot='%s'",
                           virDomainSnapshotLocationTypeToString(disk->snapshot));
+
+    if (type < 0)
+        type = VIR_DOMAIN_DISK_TYPE_FILE;
+
     if (!disk->file && disk->format == 0) {
         virBufferAddLit(buf, "/>\n");
         return;
@@ -554,12 +575,14 @@ virDomainSnapshotDiskDefFormat(virBufferPtr buf,
 
     virBufferAddLit(buf, ">\n");
 
-    virBufferAdjustIndent(buf, 6);
     if (disk->format > 0)
-        virBufferEscapeString(buf, "<driver type='%s'/>\n",
+        virBufferEscapeString(buf, "      <driver type='%s'/>\n",
                               virStorageFileFormatTypeToString(disk->format));
-    virBufferEscapeString(buf, "<source file='%s'/>\n", disk->file);
-    virBufferAdjustIndent(buf, -6);
+    virDomainDiskSourceDefFormatInternal(buf,
+                                         type,
+                                         disk->file,
+                                         0, 0, 0, NULL, 0, NULL, NULL, 0);
+
     virBufferAddLit(buf, "    </disk>\n");
 }
 
diff --git a/src/conf/snapshot_conf.h b/src/conf/snapshot_conf.h
index 6d625a7..9ed80b2 100644
--- a/src/conf/snapshot_conf.h
+++ b/src/conf/snapshot_conf.h
@@ -51,6 +51,7 @@ struct _virDomainSnapshotDiskDef {
     char *name; /* name matching the <target dev='...' of the domain */
     int index; /* index within snapshot->dom->disks that matches name */
     int snapshot; /* enum virDomainSnapshotLocation */
+    int type; /* enum virDomainDiskType */
     char *file; /* new source file when snapshot is external */
     int format; /* enum virStorageFileFormat */
 };
-- 
1.9.0