[libvirt] [PATCH] qemu-ns: Detect /dev/* mount point duplicates better

[Erik Skultety]

On Thu, Oct 19, 2017 at 03:34:34PM +0200, Michal Privoznik wrote:
> https://bugzilla.redhat.com/show_bug.cgi?id=1495511
>
> When creating new /dev for domain ran in namespace we try to
> preserve all sub-mounts of /dev. Well, not quite all. For
> instance if /dev/foo/bar and /dev/foo are both mount points, only
> /dev/foo needs preserving. /dev/foo/bar is preserved with it too.
> Now, to identify such cases like this one STRPREFIX() is used.
> That is not good enough. While it works for [/dev/foo/bar;
> /dev/foo] case, it fails for [/dev/prefix; /dev/prefix2] where
> the strings share the same prefix but are in fact two different
> paths. The solution is to use STRSKIP().
>
> Signed-off-by: Michal Privoznik <mprivozn at redhat.com>

Reviewed-by: Erik Skultety <eskultet at redhat.com>