tests/test-cache-unaligned.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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  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_filter cache
  38 requires_nbdsh_uri
  39
  40 sock=$(mktemp -u /tmp/nbdkit-test-sock.XXXXXX)
  41 files="cache-unaligned.img $sock cache-unaligned.pid"
  42 rm -f $files
  43 cleanup_fn rm -f $files
  44
  45 # Create an empty base image which is not a multiple of 4K.
  46 $TRUNCATE -s 130000 cache-unaligned.img
  47
  48 # Run nbdkit with the caching filter.
  49 start_nbdkit -P cache-unaligned.pid -U $sock --filter=cache \
  50              file cache-unaligned.img
  51
  52 nbdsh --connect "nbd+unix://?socket=$sock" \
  53       -c '
  54 # Write some pattern data to the overlay and check it reads back OK.
  55 buf = b"abcdefghijklm" * 10000
  56 h.pwrite(buf, 0)
  57 buf2 = h.pread(130000, 0)
  58 assert buf == buf2
  59
  60 # Flushing should write through to the underlying file.
  61 h.flush()
  62
  63 with open("cache-unaligned.img", "rb") as file:
  64     buf2 = file.read(130000)
  65     assert buf == buf2
  66 '