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
   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 # XXX Suggestion to improve this test: Use the delay filter below the
  34 # cache filter, and time reads to prove that the second read is faster
  35 # because it isn't going through the delay filter and plugin.
  36
  37 source ./functions.sh
  38 set -e
  39 set -x
  40
  41 sock=`mktemp -u`
  42 files="cache-on-read.img $sock cache-on-read.pid"
  43 rm -f $files
  44 cleanup_fn rm -f $files
  45
  46 # Create an empty base image.
  47 truncate -s 1G cache-on-read.img
  48
  49 # Run nbdkit with the caching filter and cache-on-read set.
  50 start_nbdkit -P cache-on-read.pid -U $sock \
  51              --filter=cache \
  52              file cache-on-read.img \
  53              cache-on-read=true
  54
  55 # Open the overlay and perform some operations.
  56 guestfish --format=raw -a "nbd://?socket=$sock" <<'EOF'
  57   run
  58   part-disk /dev/sda gpt
  59   mkfs ext4 /dev/sda1
  60   mount /dev/sda1 /
  61   fill-dir / 10000
  62   fill-pattern "abcde" 5M /large
  63   write /hello "hello, world"
  64 EOF
  65
  66 # Check the last files we created exist.
  67 guestfish --ro -a cache-on-read.img -m /dev/sda1 <<'EOF'
  68   cat /hello
  69   cat /large | cat >/dev/null
  70 EOF