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qcow2: Prohibit backing file changes in 'qemu-img amend'

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This was deprecated back in bc5ee6da7 (qcow2: Deprecate use of
qemu-img amend to change backing file), and no one in the meantime has
given any reasons why it should be supported.  Time to make change
attempts a hard error (but for convenience, specifying the _same_
backing chain is not forbidden).  Update a couple of iotests to match.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20210503213600.569128-2-eblake@redhat.com>
Reviewed-by: Connor Kuehl <ckuehl@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Eric Blake 2021-05-03 14:35:59 -07:00 • committed by Kevin Wolf
parent 2842ff2d81
commit 5a385bf5c5
6 changed files with 25 additions and 24 deletions
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6
tests/qemu-iotests/082.out
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@ -808,12 +808,14 @@ Amend options for 'qcow2':
size=<size> - Virtual disk size
Testing: amend -f qcow2 -o backing_file=TEST_DIR/t.qcow2,,help TEST_DIR/t.qcow2
qemu-img: warning: Deprecated use of amend to alter the backing file; use qemu-img rebase instead
qemu-img: Cannot amend the backing file
You can use 'qemu-img rebase' instead.
Testing: rebase -u -b -f qcow2 TEST_DIR/t.qcow2
Testing: amend -f qcow2 -o backing_file=TEST_DIR/t.qcow2,,? TEST_DIR/t.qcow2
qemu-img: warning: Deprecated use of amend to alter the backing file; use qemu-img rebase instead
qemu-img: Cannot amend the backing file
You can use 'qemu-img rebase' instead.
Testing: rebase -u -b -f qcow2 TEST_DIR/t.qcow2