Re: [PATCH 3/6] storage: fs: Don't attempt directory creation if it already exists

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Hi,Cole

After this patch is included in libvirt on rhel7.2,virt-manager can not create dir pool with existing directory. There is no default pool created in a fresh rhel7.2 system,so if I try to create default pool,the below error shows: Error creating pool: Could not build storage pool: failed to create directory '/var/lib/libvirt/images': File exists

Do you think it's acceptable for this change since the directory(/var/lib/libvirt/images) is created by libvirt,if users want to create pool with /var/lib/libvirt/images,they need to delete images directory firstly,if so I think maybe some notes in doc is preferred,thanks very much.

On 04/28/2015 04:48 AM, Cole Robinson wrote:
The current code attempts to handle this, but it only catches mkdir
failing with EEXIST. However if say trying to build /tmp for an
unprivileged qemu:///session, mkdir will fail with EPERM.

Rather than catch any errors, just don't attempt mkdir if the directory
already exists.
---
  src/util/virfile.c | 13 +++++++------
  1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/src/util/virfile.c b/src/util/virfile.c
index 87d121d..23a1655 100644
--- a/src/util/virfile.c
+++ b/src/util/virfile.c
@@ -2289,12 +2289,13 @@ virDirCreateNoFork(const char *path,
      int ret = 0;
      struct stat st;
- if ((mkdir(path, mode) < 0)
-        && !((errno == EEXIST) && (flags & VIR_DIR_CREATE_ALLOW_EXIST))) {
-        ret = -errno;
-        virReportSystemError(errno, _("failed to create directory '%s'"),
-                             path);
-        goto error;
+    if (!(flags & VIR_DIR_CREATE_ALLOW_EXIST) || !virFileExists(path)) {
+        if (mkdir(path, mode) < 0) {
+            ret = -errno;
+            virReportSystemError(errno, _("failed to create directory '%s'"),
+                                 path);
+            goto error;
+        }
      }
if (stat(path, &st) == -1) {

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