block: move encryption deprecation warning into qcow code

For a couple of releases we have been warning

  Encrypted images are deprecated
  Support for them will be removed in a future release.
  You can use 'qemu-img convert' to convert your image to an unencrypted one.

This warning was issued by system emulators, qemu-img, qemu-nbd
and qemu-io. Such a broad warning was issued because the original
intention was to rip out all the code for dealing with encryption
inside the QEMU block layer APIs.

The new block encryption framework used for the LUKS driver does
not rely on the unloved block layer API for encryption keys,
instead using the QOM 'secret' object type. It is thus no longer
appropriate to warn about encryption unconditionally.

When the qcow/qcow2 drivers are converted to use the new encryption
framework too, it will be practical to keep AES-CBC support present
for use in qemu-img, qemu-io & qemu-nbd to allow for interoperability
with older QEMU versions and liberation of data from existing encrypted
qcow2 files.

This change moves the warning out of the generic block code and
into the qcow/qcow2 drivers. Further, the warning is set to only
appear when running the system emulators, since qemu-img, qemu-io,
qemu-nbd are expected to support qcow2 encryption long term now that
the maint burden has been eliminated.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 0 insertions, 18 deletions

diff --git a/tests/qemu-iotests/134.out b/tests/qemu-iotests/134.out
index a16acb8..6493704 100644
--- a/tests/qemu-iotests/134.out
+++ b/tests/qemu-iotests/134.out
@@ -1,43 +1,25 @@
 QA output created by 134
-qemu-img: Encrypted images are deprecated
-Support for them will be removed in a future release.
-You can use 'qemu-img convert' to convert your image to an unencrypted one.
-qemu-img: Encrypted images are deprecated
-Support for them will be removed in a future release.
-You can use 'qemu-img convert' to convert your image to an unencrypted one.
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 encryption=on
 
 == reading whole image ==
-Encrypted images are deprecated
-Support for them will be removed in a future release.
-You can use 'qemu-img convert' to convert your image to an unencrypted one.
 Disk image 'TEST_DIR/t.qcow2' is encrypted.
 password:
 read 134217728/134217728 bytes at offset 0
 128 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 
 == rewriting whole image ==
-Encrypted images are deprecated
-Support for them will be removed in a future release.
-You can use 'qemu-img convert' to convert your image to an unencrypted one.
 Disk image 'TEST_DIR/t.qcow2' is encrypted.
 password:
 wrote 134217728/134217728 bytes at offset 0
 128 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 
 == verify pattern ==
-Encrypted images are deprecated
-Support for them will be removed in a future release.
-You can use 'qemu-img convert' to convert your image to an unencrypted one.
 Disk image 'TEST_DIR/t.qcow2' is encrypted.
 password:
 read 134217728/134217728 bytes at offset 0
 128 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 
 == verify pattern failure with wrong password ==
-Encrypted images are deprecated
-Support for them will be removed in a future release.
-You can use 'qemu-img convert' to convert your image to an unencrypted one.
 Disk image 'TEST_DIR/t.qcow2' is encrypted.
 password:
 Pattern verification failed at offset 0, 134217728 bytes