QA output created by 114
qemu-img: warning: Deprecated use of backing file without explicit backing format (detected format of raw)
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 backing_file=TEST_DIR/t.IMGFMT.orig
Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=67108864
qemu-img: warning: Deprecated use of backing file without explicit backing format
qemu-img: warning: Deprecated use of backing file without explicit backing format (detected format of IMGFMT)
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 backing_file=TEST_DIR/t.IMGFMT.base backing_fmt=IMGFMT
qemu-img: warning: Deprecated use of unopened backing file without explicit backing format, use of this image requires potentially unsafe format probing
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 backing_file=TEST_DIR/t.IMGFMT.base
image: TEST_DIR/t.IMGFMT
file format: IMGFMT
virtual size: 64 MiB (67108864 bytes)
cluster_size: 65536
backing file: TEST_DIR/t.IMGFMT.base
backing file format: foo
qemu-io: can't open device TEST_DIR/t.qcow2: Could not open backing file: Unknown driver 'foo'
no file open, try 'help open'
read 4096/4096 bytes at offset 0
4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
qemu-img: warning: Deprecated use of backing file without explicit backing format, use of this image requires potentially unsafe format probing
read 4096/4096 bytes at offset 0
4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
*** done