[libvirt] [PATCH 3/4] virFileIsSharedFSType: Detect direct mount points

[Michal Privoznik]

If the given path is already a mount point (e.g. a bind mount of
a file, or simply a direct mount point of a FS), then our code
fails to detect that because the first thing it does is cutting
off part after last slash '/'.

Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
 src/util/virfile.c  | 8 ++++----
 tests/virfiletest.c | 3 +--
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/src/util/virfile.c b/src/util/virfile.c
index 2a7e87102a..666d703f99 100644
--- a/src/util/virfile.c
+++ b/src/util/virfile.c
@@ -3534,15 +3534,16 @@ virFileIsSharedFSType(const char *path,
                       int fstypes)
 {
     VIR_AUTOFREE(char *) dirpath = NULL;
-    char *p;
+    char *p = NULL;
     struct statfs sb;
     int statfs_ret;
 
     if (VIR_STRDUP(dirpath, path) < 0)
         return -1;
 
-    do {
+    statfs_ret = statfs(dirpath, &sb);
 
+    while ((statfs_ret < 0) && (p != dirpath)) {
         /* Try less and less of the path until we get to a
          * directory we can stat. Even if we don't have 'x'
          * permission on any directory in the path on the NFS
@@ -3563,8 +3564,7 @@ virFileIsSharedFSType(const char *path,
             *p = '\0';
 
         statfs_ret = statfs(dirpath, &sb);
-
-    } while ((statfs_ret < 0) && (p != dirpath));
+    }
 
     if (statfs_ret < 0) {
         virReportSystemError(errno,
diff --git a/tests/virfiletest.c b/tests/virfiletest.c
index 22c163f0a0..42d918aecc 100644
--- a/tests/virfiletest.c
+++ b/tests/virfiletest.c
@@ -453,8 +453,7 @@ mymain(void)
     DO_TEST_FILE_IS_SHARED_FS_TYPE("mounts1.txt", "/boot/vmlinuz", false);
     DO_TEST_FILE_IS_SHARED_FS_TYPE("mounts2.txt", "/run/user/501/gvfs/some/file", false);
     DO_TEST_FILE_IS_SHARED_FS_TYPE("mounts3.txt", "/nfs/file", true);
-    /* TODO Detect bind mounts */
-    DO_TEST_FILE_IS_SHARED_FS_TYPE("mounts3.txt", "/nfs/blah", true);
+    DO_TEST_FILE_IS_SHARED_FS_TYPE("mounts3.txt", "/nfs/blah", false);
 
     return ret != 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 }
-- 
2.18.0