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block: Improve empty format-specific info dump

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When a block driver supports obtaining format-specific information, but
that object only contains optional fields, it is possible that none of
them are present, so that dump_qobject() (called by
bdrv_image_info_specific_dump()) will not print anything.

The callers of bdrv_image_info_specific_dump() put a header above this
information ("Format specific information:\n"), which will look strange
when there is nothing below.  Modify bdrv_image_info_specific_dump() to
print this header instead of its callers, and only if there is indeed
something to be printed.

Signed-off-by: Hanna Reitz <hreitz@redhat.com>
Message-Id: <20220620162704.80987-2-hreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Hanna Reitz 2022-06-20 18:26:53 +02:00 • committed by Kevin Wolf
parent fcb9e05144
commit 3716470b24
3 changed files with 41 additions and 7 deletions
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4
qemu-io-cmds.c
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@ -1788,8 +1788,8 @@ static int info_f(BlockBackend *blk, int argc, char **argv)
return -EIO;
}
if (spec_info) {
printf("Format specific information:\n");
bdrv_image_info_specific_dump(spec_info);
bdrv_image_info_specific_dump(spec_info,
"Format specific information:\n");
qapi_free_ImageInfoSpecific(spec_info);
}