QA output created by qcow2-internal-snapshots
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864

=== Write some data, take a snapshot and overwrite part of it ===

QEMU X.Y.Z monitor - type 'help' for more information
(qemu) qemu-io disk0 "write -P0x11 0 1M"
wrote 1048576/1048576 bytes at offset 0
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
(qemu) savevm snap0
(qemu) qemu-io disk0 "write -P0x22 0 512k"
wrote 524288/524288 bytes at offset 0
512 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
(qemu) quit

Snapshot list:
ID        TAG               VM SIZE                DATE     VM CLOCK     ICOUNT
1         snap0                SIZE yyyy-mm-dd hh:mm:ss 00:00:00.000
No errors were found on the image.

=== Verify that loading the snapshot reverts to the old content ===

QEMU X.Y.Z monitor - type 'help' for more information
(qemu) qemu-io disk0 "read -P0x11 0 1M"
read 1048576/1048576 bytes at offset 0
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
(qemu) qemu-io disk0 "write -P0x33 512k 512k"
wrote 524288/524288 bytes at offset 524288
512 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
(qemu) loadvm snap0
(qemu) qemu-io disk0 "read -P0x11 0 1M"
read 1048576/1048576 bytes at offset 0
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
(qemu) qemu-io disk0 "write -P0x33 63k 2k"
wrote 2048/2048 bytes at offset 64512
2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
(qemu) qemu-io disk0 "read -P0x11 0 63k"
read 64512/64512 bytes at offset 0
63 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
(qemu) qemu-io disk0 "read -P0x33 63k 2k"
read 2048/2048 bytes at offset 64512
2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
(qemu) qemu-io disk0 "read -P0x11 65k 63k"
read 64512/64512 bytes at offset 66560
63 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
(qemu) savevm snap1
(qemu) quit

Snapshot list:
ID        TAG               VM SIZE                DATE     VM CLOCK     ICOUNT
1         snap0                SIZE yyyy-mm-dd hh:mm:ss 00:00:00.000
2         snap1                SIZE yyyy-mm-dd hh:mm:ss 00:00:00.000
No errors were found on the image.

=== qemu-img snapshot can revert to snapshots ===

read 1048576/1048576 bytes at offset 0
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 64512/64512 bytes at offset 0
63 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 2048/2048 bytes at offset 64512
2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 64512/64512 bytes at offset 66560
63 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)

=== Deleting snapshots ===

QEMU X.Y.Z monitor - type 'help' for more information
(qemu) delvm snap1
(qemu) qemu-io disk0 "read -P0x11 0 63k"
read 64512/64512 bytes at offset 0
63 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
(qemu) qemu-io disk0 "read -P0x33 63k 2k"
read 2048/2048 bytes at offset 64512
2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
(qemu) qemu-io disk0 "read -P0x11 65k 63k"
read 64512/64512 bytes at offset 66560
63 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
(qemu) quit

Snapshot list:
ID        TAG               VM SIZE                DATE     VM CLOCK     ICOUNT
1         snap0                SIZE yyyy-mm-dd hh:mm:ss 00:00:00.000
No errors were found on the image.

=== Error cases ===

QEMU X.Y.Z monitor - type 'help' for more information
(qemu) QEMU_PROG: Snapshot 'snap1' does not exist in one or more devices

QEMU X.Y.Z monitor - type 'help' for more information
(qemu) loadvm snap1
Error: Snapshot 'snap1' does not exist in one or more devices
(qemu) quit

QEMU_PROG: 'incoming' and 'loadvm' options are mutually exclusive
QEMU X.Y.Z monitor - type 'help' for more information
(qemu) loadvm snap0
Error: Device 'disk0' is writable but does not support snapshots
(qemu) delvm snap0
Error: Device 'disk0' is writable but does not support snapshots
(qemu) savevm snap1
Error: Device 'disk0' is writable but does not support snapshots
(qemu) quit

QEMU_PROG: 'preconfig' and 'loadvm' options are mutually exclusive
*** done