QA output created by 279
Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=67108864
Formatting 'TEST_DIR/t.IMGFMT.mid', fmt=IMGFMT size=67108864 backing_file=TEST_DIR/t.IMGFMT.base
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 backing_file=TEST_DIR/t.IMGFMT.mid

== qemu-img info --backing-chain ==
image: TEST_DIR/t.IMGFMT
file format: IMGFMT
virtual size: 64 MiB (67108864 bytes)
backing file: TEST_DIR/t.IMGFMT.mid

image: TEST_DIR/t.IMGFMT.mid
file format: IMGFMT
virtual size: 64 MiB (67108864 bytes)
backing file: TEST_DIR/t.IMGFMT.base

image: TEST_DIR/t.IMGFMT.base
file format: IMGFMT
virtual size: 64 MiB (67108864 bytes)

== qemu-img info --backing-chain --image-opts ==
image: TEST_DIR/t.IMGFMT
file format: IMGFMT
virtual size: 64 MiB (67108864 bytes)
backing file: TEST_DIR/t.IMGFMT.mid

image: TEST_DIR/t.IMGFMT.mid
file format: IMGFMT
virtual size: 64 MiB (67108864 bytes)
backing file: TEST_DIR/t.IMGFMT.base

image: TEST_DIR/t.IMGFMT.base
file format: IMGFMT
virtual size: 64 MiB (67108864 bytes)
*** done