mkfs.btrfs: fail on scandir error (-r mode)

mkfs.btrfs does not handle relative pathnames for now. When
they are passed to it it creates empty image. So first time
I thought it does not work at all.

This patch adds error handling for scandir(). With patch it behaves
this way:

    $ mkfs.btrfs -r ./root
    ...
    fs created label (null) on output.img
            nodesize 4096 leafsize 4096 sectorsize 4096 size 256.00MB
    Btrfs v0.19-52-g438c5ff-dirty
    scandir for ./root failed: No such file or directory
    unable to traverse_directory
    Making image is aborted.
    mkfs.btrfs: mkfs.c:1402: main: Assertion `!(ret)' failed.

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
Signed-off-by: Hugo Mills <hugo@carfax.org.uk>

1 files changed, 6 insertions, 0 deletions

diff --git a/mkfs.c b/mkfs.c
index 171710e5..efd85d58 100644
--- a/mkfs.c
+++ b/mkfs.c
@@ -895,6 +895,12 @@ static int traverse_directory(struct btrfs_trans_handle *trans,
 
 		count = scandir(parent_dir_entry->path, &files,
 				directory_select, NULL);
+		if (count == -1)
+		{
+			fprintf(stderr, "scandir for %s failed: %s\n",
+				parent_dir_name, strerror (errno));
+			goto fail;
+		}
 
 		for (i = 0; i < count; i++) {
 			cur_file = files[i];