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

[Richard W.M. Jones]

On Mon, May 16, 2016 at 02:25:03PM +0200, Pino Toscano wrote:
> 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

Looks reasonable, ACK.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-df lists disk usage of guests without needing to install any
software inside the virtual machine.  Supports Linux and Windows.
http://people.redhat.com/~rjones/virt-df/