tests/test-cow-block-size.sh

   1 #!/usr/bin/env bash
   2 # nbdkit
   3 # Copyright (C) 2018-2021 Red Hat Inc.
   4 #
   5 # Redistribution and use in source and binary forms, with or without
   6 # modification, are permitted provided that the following conditions are
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   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,
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  26 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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  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 requires_plugin linuxdisk
  38 requires guestfish --version
  39 requires nbdcopy --version
  40 requires $STAT --version
  41
  42 sock=$(mktemp -u /tmp/nbdkit-test-sock.XXXXXX)
  43 files="cow-block-size-base.img $sock cow-block-size.pid"
  44 rm -f $files
  45 cleanup_fn rm -f $files
  46
  47 # Create a base image which is partitioned with an empty filesystem.
  48 rm -rf cow-block-size.d
  49 mkdir cow-block-size.d
  50 cleanup_fn rm -rf cow-block-size.d
  51 nbdkit -fv -U - linuxdisk cow-block-size.d size=100M \
  52        --run 'nbdcopy "$uri" cow-block-size-base.img'
  53 lastmod="$($STAT -c "%y" cow-block-size-base.img)"
  54
  55 # Run nbdkit with a COW overlay, 4M block size and copy on read.
  56 start_nbdkit -P cow-block-size.pid -U $sock \
  57              --filter=cow file cow-block-size-base.img \
  58              cow-block-size=4M cow-on-read=true
  59
  60 # Write some data into the overlay.
  61 guestfish --format=raw -a "nbd://?socket=$sock" -m /dev/sda1 <<EOF
  62   fill-pattern "abcde" 128K /large
  63   write /hello "hello, world"
  64 EOF
  65
  66 # The original file must not be modified.
  67 currmod="$($STAT -c "%y" cow-block-size-base.img)"
  68
  69 if [ "$lastmod" != "$currmod" ]; then
  70     echo "$0: FAILED last modified time of base file changed"
  71     exit 1
  72 fi