qemu-img: Improve commit invalid base message
When trying to invoke qemu-img commit with a base image file name that is not part of the top image's backing chain, the user receives a rather plain "Base not found" error message. This is not really helpful because it does not explain what "not found" means, potentially leaving the user wondering why qemu cannot find a file despite it clearly existing in the file system. Improve the error message by clarifying that "not found" means "not found in the top image's backing chain". Reported-by: NAla Hino <ahino@redhat.com> Signed-off-by: NMax Reitz <mreitz@redhat.com> Message-id: 20161201020508.24417-1-mreitz@redhat.com Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NMax Reitz <mreitz@redhat.com>
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