1 QA output created by 114
2 Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=67108864
3 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 backing_file='TEST_DIR/t.IMGFMT.base'
4 image: TEST_DIR/t.IMGFMT
6 virtual size: 64M (67108864 bytes)
8 backing file: TEST_DIR/t.IMGFMT.base
9 backing file format: foo
10 qemu-io: can't open device TEST_DIR/t.qcow2: Could not open backing file: Unknown driver 'foo'
11 read 4096/4096 bytes at offset 0
12 4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)