[PATCH 03/12] storage: Extract error reporting for broken chains

[Peter Krempa <pkrempa@xxxxxxxxxx>]

Simplify reporting the error if backing chain is broken for further
callers by extracting it into a separate function.
---
 src/storage/storage_source.c | 47 +++++++++++++++++++++++++++++++-------------
 src/storage/storage_source.h |  4 ++++
 2 files changed, 37 insertions(+), 14 deletions(-)

diff --git a/src/storage/storage_source.c b/src/storage/storage_source.c
index cced5308c..4586ef4ad 100644
--- a/src/storage/storage_source.c
+++ b/src/storage/storage_source.c
@@ -404,6 +404,38 @@ virStorageFileChown(const virStorageSource *src,
 }


+/**
+ * virStorageFileReportBrokenChain:
+ *
+ * @errcode: errno when accessing @src
+ * @src: inaccessible file in the backing chain of @parent
+ * @parent: root virStorageSource being checked
+ *
+ * Reports the correct error message if @src is missing in the backing chain
+ * for @parent.
+ */
+void
+virStorageFileReportBrokenChain(int errcode,
+                                virStorageSourcePtr src,
+                                virStorageSourcePtr parent)
+{
+    unsigned int access_user = src->drv->uid;
+    unsigned int access_group = src->drv->gid;
+
+    if (src == parent) {
+        virReportSystemError(errcode,
+                             _("Cannot access storage file '%s' "
+                               "(as uid:%u, gid:%u)"),
+                             src->path, access_user, access_group);
+    } else {
+        virReportSystemError(errcode,
+                             _("Cannot access backing file '%s' "
+                               "of storage file '%s' (as uid:%u, gid:%u)"),
+                             src->path, parent->path, access_user, access_group);
+    }
+}
+
+
 /* Recursive workhorse for virStorageFileGetMetadata.  */
 static int
 virStorageFileGetMetadataRecurse(virStorageSourcePtr src,
@@ -433,20 +465,7 @@ virStorageFileGetMetadataRecurse(virStorageSourcePtr src,
         return -1;

     if (virStorageFileAccess(src, F_OK) < 0) {
-        if (src == parent) {
-            virReportSystemError(errno,
-                                 _("Cannot access storage file '%s' "
-                                   "(as uid:%u, gid:%u)"),
-                                 src->path, (unsigned int)uid,
-                                 (unsigned int)gid);
-        } else {
-            virReportSystemError(errno,
-                                 _("Cannot access backing file '%s' "
-                                   "of storage file '%s' (as uid:%u, gid:%u)"),
-                                 src->path, parent->path,
-                                 (unsigned int)uid, (unsigned int)gid);
-        }
-
+        virStorageFileReportBrokenChain(errno, src, parent);
         goto cleanup;
     }

diff --git a/src/storage/storage_source.h b/src/storage/storage_source.h
index 320ea3cab..0640c138e 100644
--- a/src/storage/storage_source.h
+++ b/src/storage/storage_source.h
@@ -52,4 +52,8 @@ int virStorageFileGetMetadata(virStorageSourcePtr src,
 char *virStorageFileGetBackingStoreStr(virStorageSourcePtr src)
     ATTRIBUTE_NONNULL(1);

+void virStorageFileReportBrokenChain(int errcode,
+                                     virStorageSourcePtr src,
+                                     virStorageSourcePtr parent);
+
 #endif /* __VIR_STORAGE_SOURCE_H__ */
-- 
2.14.1

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