[Libguestfs] [PATCH] btrfs_filesystem_show: work with btrfs < 4.3.1

[Pino Toscano]

Versions older than 4.3.1 output also the version string after the
output.  Ignore such line, since it isn't relevant to what
btrfs_filesystem_show needs.
---
 daemon/btrfs.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/daemon/btrfs.c b/daemon/btrfs.c
index 62bdac7..9b52aa8 100644
--- a/daemon/btrfs.c
+++ b/daemon/btrfs.c
@@ -2270,6 +2270,12 @@ do_btrfs_filesystem_show (const char *device)
     } else if (STRPREFIX (lines[i], "\t*** Some devices missing")) {
       reply_with_error_errno (ENODEV, "%s: missing devices", device);
       return NULL;
+    } else if (STRPREFIX (lines[i], "btrfs-progs v")) {
+      /* Older versions of btrfs-progs output also the version string
+       * (the same as `btrfs --version`.  This has been fixed upstream
+       * since v4.3.1, commit e29ec82e4e66042ca55bf8cd9ef609e3b21a7eb7.
+       * To support these older versions, ignore the version line.  */
+      continue;
     } else {
       reply_with_error ("unrecognized line in output from 'btrfs filesystem show': %s", lines[i]);
       return NULL;
-- 
2.5.5