[archiso] Add support for img_label= and allow img_dev same as cow_dev

* Support img_label=
* Allow use img_dev= as cow_device=
* Use new function _mnt_dev() from archiso.
* Check for error while setting loopback device.

Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@yahoo.com.ar>

1 files changed, 3 insertions, 1 deletions

diff --git a/README b/README
index 16c318f..8a808cf 100644
--- a/README
+++ b/README
@@ -79,8 +79,10 @@ INDEX
 
 ** hooks/archiso_loop_mnt
 
-* img_dev=          Device where archiso-image.iso reside.
+* img_label=        Set the filesystem label where archiso-image.iso.
                     Default: (unset)
+* img_dev=          Device where archiso-image.iso reside.
+                    Default: (unset) or "/dev/disk/by-label/${img_label}"
 * img_loop=         Full path where archiso-image.iso is located on ${img_dev}
                     Default: (unset)