3 # Copyright (C) 2018 Red Hat Inc.
5 # Redistribution and use in source and binary forms, with or without
6 # modification, are permitted provided that the following conditions are
9 # * Redistributions of source code must retain the above copyright
10 # notice, this list of conditions and the following disclaimer.
12 # * Redistributions in binary form must reproduce the above copyright
13 # notice, this list of conditions and the following disclaimer in the
14 # documentation and/or other materials provided with the distribution.
16 # * Neither the name of Red Hat nor the names of its contributors may be
17 # used to endorse or promote products derived from this software without
18 # specific prior written permission.
20 # THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
21 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22 # THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
23 # PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
24 # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
27 # USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
28 # ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29 # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
30 # OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 requires_plugin linuxdisk
38 requires guestfish
--version
39 requires nbdcopy
--version
40 requires qemu-img
--version
41 requires
$STAT --version
43 sock
=$
(mktemp
-u /tmp
/nbdkit-test-sock.XXXXXX
)
44 files
="cow-base.img cow-diff.qcow2 $sock cow.pid"
46 cleanup_fn
rm -f $files
48 # Create a base image which is partitioned with an empty filesystem.
51 cleanup_fn
rm -rf cow.d
52 nbdkit
-fv -U - linuxdisk cow.d size
=100M \
53 --run 'nbdcopy "$uri" cow-base.img'
54 lastmod
="$($STAT -c "%y
" cow-base.img)"
56 # Run nbdkit with a COW overlay.
57 start_nbdkit
-P cow.pid
-U $sock --filter=cow
file cow-base.img
59 # Write some data into the overlay.
60 guestfish
--format=raw
-a "nbd://?socket=$sock" -m /dev
/sda1
<<EOF
61 fill-pattern "abcde" 128K /large
62 write /hello "hello, world"
65 # The original file must not be modified.
66 currmod
="$($STAT -c "%y
" cow-base.img)"
68 if [ "$lastmod" != "$currmod" ]; then
69 echo "$0: FAILED last modified time of base file changed"
73 # If we have qemu-img, try the hairy rebase operation documented
74 # in the nbdkit-cow-filter manual.
75 if qemu-img
--version >/dev
/null
2>&1; then
76 qemu-img create
-F raw
-b nbd
:unix
:$sock -f qcow2 cow-diff.qcow2
77 time qemu-img rebase
-F raw
-b cow-base.img
-f qcow2 cow-diff.qcow2
78 qemu-img info cow-diff.qcow2
80 # This checks the file we created exists.
81 guestfish
--ro -a cow-diff.qcow2
-m /dev
/sda1
cat /hello