tests/test-cache-on-read.sh

   1 #!/usr/bin/env bash
   2 # nbdkit
   3 # Copyright (C) 2018 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,
  25 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  26 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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  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 requires nbdsh --version
  38
  39 sock=`mktemp -u`
  40 files="cache-on-read.img $sock cache-on-read.pid"
  41 rm -f $files
  42 cleanup_fn rm -f $files
  43
  44 # Create an empty base image.
  45 truncate -s 128K cache-on-read.img
  46
  47 # Run nbdkit with the caching filter and cache-on-read set.
  48 start_nbdkit -P cache-on-read.pid -U $sock \
  49              --filter=cache \
  50              file cache-on-read.img \
  51              cache-on-read=true
  52
  53 nbdsh --connect "nbd+unix://?socket=$sock" \
  54       -c '
  55 # Write some pattern data to the overlay and check it reads back OK.
  56 buf = b"abcd" * 16384
  57 h.pwrite (buf, 32768)
  58 zero = h.pread (32768, 0)
  59 assert zero == bytearray (32768)
  60 buf2 = h.pread (65536, 32768)
  61 assert buf == buf2
  62
  63 # XXX Suggestion to improve this test: Use the delay filter below the
  64 # cache filter, and time reads to prove that the second read is faster
  65 # because it is not going through the delay filter and plugin.
  66 # XXX second h.pread here ...
  67 '