tests/test-cow-extents1.sh

   1 #!/usr/bin/env bash
   2 # nbdkit
   3 # Copyright Red Hat
   4 #
   5 # Redistribution and use in source and binary forms, with or without
   6 # modification, are permitted provided that the following conditions are
   7 # met:
   8 #
   9 # * Redistributions of source code must retain the above copyright
  10 # notice, this list of conditions and the following disclaimer.
  11 #
  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.
  15 #
  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.
  19 #
  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
  31 # SUCH DAMAGE.
  32
  33 source ./functions.sh
  34 set -e
  35 set -x
  36
  37 # Test does not run on Windows because we must mark the test file
  38 # specially so that Windows recognizes it as sparse.  We do not have
  39 # the tools available usually to do this (plus I also suspect that
  40 # Wine does not emulate this properly).
  41 if is_windows; then
  42     echo "$0: this test needs to be revised to work on Windows"
  43     exit 77
  44 fi
  45
  46 requires_filter cow
  47 requires_plugin file
  48
  49 requires test -r /dev/urandom
  50
  51 requires $CUT --version
  52 requires dd --version
  53 requires_nbdinfo
  54 requires nbdsh --version
  55 requires $STAT --version
  56 requires tr --version
  57 requires $TRUNCATE --version
  58
  59 if ! nbdinfo --help | grep -- --map ; then
  60     echo "$0: nbdinfo --map option required to run this test"
  61     exit 77
  62 fi
  63
  64 base=cow-extents1-base.img
  65 pid=cow-extents1.pid
  66 out=cow-extents1.out
  67 sock=$(mktemp -u /tmp/nbdkit-test-sock.XXXXXX)
  68 files="$base $pid $out $sock"
  69 rm -f $files
  70 cleanup_fn rm -f $files
  71
  72 # Create a base file which is half allocated, half sparse.
  73 dd if=/dev/urandom of=$base count=128 bs=1K
  74 $TRUNCATE -s 4M $base
  75 lastmod="$($STAT -c "%y" $base)"
  76
  77 # Run nbdkit with a COW overlay.
  78 start_nbdkit -P $pid -U $sock --filter=cow file $base
  79 uri="nbd+unix:///?socket=$sock"
  80
  81 # The map should reflect the base image.
  82 nbdinfo --map "$uri" > $out
  83 cat $out
  84 if [ "$(tr -s ' ' < $out | $CUT -d' ' -f 1-4)" != " 0 131072 0
  85  131072 4063232 3" ]; then
  86     echo "$0: unexpected initial file map"
  87     exit 1
  88 fi
  89
  90 # Punch some holes.
  91 nbdsh -u "$uri" \
  92       -c 'bs = 65536' \
  93       -c 'h.trim(bs, bs)' \
  94       -c 'h.trim(bs+2, 4*bs-1)' \
  95       -c 'h.pwrite(b"1"*bs, 16*bs)' \
  96       -c 'h.trim(2*bs, 32*bs)' \
  97       -c 'h.pwrite(b"2"*(2*bs), 48*bs)'
  98
  99 # The extents map should be fully allocated.
 100 nbdinfo --map "$uri" > $out
 101 cat $out
 102 if [ "$(tr -s ' ' < $out | $CUT -d' ' -f 1-4)" != " 0 65536 0
 103  65536 131072 3
 104  196608 65536 0
 105  262144 65536 3
 106  327680 65536 0
 107  393216 655360 3
 108  1048576 65536 0
 109  1114112 2031616 3
 110  3145728 131072 0
 111  3276800 917504 3" ]; then
 112     echo "$0: unexpected trimmed file map"
 113     exit 1
 114 fi
 115
 116 # The original file must not be modified.
 117 currmod="$($STAT -c "%y" $base)"
 118 if [ "$lastmod" != "$currmod" ]; then
 119     echo "$0: FAILED last modified time of base file changed"
 120     exit 1
 121 fi