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qemu-img: Improve error for rebase without backing format

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When removeing support for qemu-img being able to create backing
chains without embedded backing formats, we caused a poor error
message as caught by iotest 114.  Improve the situation to inform the
user what went wrong.

Suggested-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20210708155228.2666172-1-eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Eric Blake 2021-07-08 10:52:28 -05:00 • committed by Kevin Wolf
parent 497a30dbb0
commit a7cd44bef3
2 changed files with 4 additions and 1 deletions
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3
qemu-img.c
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@ -3767,6 +3767,9 @@ static int img_rebase(int argc, char **argv)
if (ret == -ENOSPC) {
error_report("Could not change the backing file to '%s': No "
"space left in the file header", out_baseimg);
} else if (ret == -EINVAL && out_baseimg && !out_basefmt) {
error_report("Could not change the backing file to '%s': backing "
"format must be specified", out_baseimg);
} else if (ret < 0) {
error_report("Could not change the backing file to '%s': %s",
out_baseimg, strerror(-ret));