Re: [PATCH v4 2/3] xfstests: btrfs: test device replace, with EIO on the src dev

[Anand Jain <anand.jain@oracle.com>]

> So the test always fails due to a mismatch with this expected golden output:
>
>      -Label: none  uuid: <UUID>
>      +Label: none  uuid:  <UUID>
>        Total devices <NUM> FS bytes used <SIZE>
>        devid <DEVID> size <SIZE> used <SIZE> path SCRATCH_DEV
>        devid <DEVID> size <SIZE> used <SIZE> path /dev/mapper/error-test
>
> The extra space after "uuid:" comes from _filter_uuid:
>
>     sed -e "s/\(uuid[ :=]\+\) *[0-9a-f-][0-9a-f-]*/\1 <UUID>/ig"
>
> Which gets \1 with the string "uuid: " and then does "uuid: " + " " + "<UUID>".
>
> We need to either to fix the golden output here or _filter_uuid (and
> make sure it doesn't break any other tests using it directly or
> indirectly such as yours).

commit a092363bbdfa6cc6e44353136bae9d3aa81baae2 (PATCH 3/3 V6] xfs: test 
changing UUID on V5 superblock) caused the regression. btrfs/006 is 
affected as well.

   Thanks
Anand