tests/test-retry-size.sh

   1 #!/usr/bin/env bash
   2 # nbdkit
   3 # Copyright (C) 2018-2019 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 source ./functions.sh
  34 set -e
  35 set -x
  36
  37 fail=0
  38
  39 requires qemu-io --version
  40
  41 files="retry-size-open-count retry-size-fail"
  42 rm -f $files
  43 cleanup_fn rm -f $files
  44
  45 touch retry-size-open-count
  46 start_t=$SECONDS
  47
  48 # Create a custom plugin which will test retrying.
  49 st=0
  50 nbdkit -v -U - \
  51        sh - \
  52        --filter=retry retry-delay=1 \
  53        --run 'qemu-io -f raw -r $nbd \
  54     -c "r 0 512" -c "r 512 512"' <<'EOF' || st=$?
  55 #!/usr/bin/env bash
  56 case "$1" in
  57     open)
  58         # Count how many times the connection is (re-)opened.
  59         read i < retry-size-open-count
  60         echo $((i+1)) > retry-size-open-count
  61         ;;
  62     get_size)
  63         # Temporarily report a smaller size
  64         read i < retry-size-open-count
  65         if [ $i = 2 ]; then
  66             echo 512
  67         else
  68             echo 1024
  69         fi
  70         ;;
  71     pread)
  72         # Fail first open unconditionally
  73         # On second open, ensure nbdkit obyes smaller bound
  74         # On third open, allow read to succeed
  75         read i < retry-size-open-count
  76         case $i in
  77             1) echo "EIO too soon to read" >&2
  78                exit 1 ;;
  79             2) if [ $(( $3 + $4 )) -gt 512 ]; then
  80                    touch retry-size-fail
  81                fi ;;
  82         esac
  83         dd if=/dev/zero count=$3 iflag=count_bytes
  84         ;;
  85     *) exit 2 ;;
  86 esac
  87 EOF
  88
  89 # In this test we should see the following:
  90 # open reports size 1024
  91 # first pread FAILS
  92 # retry and wait 1 seconds
  93 # open reports size 512
  94 # first pread succeeds
  95 # second pread FAILS without calling into pread
  96 # retry and wait 1 seconds
  97 # open reports size 1024
  98 # second pread succeeds
  99
 100 # The minimum time for the test should be 1+1 = 2 seconds.
 101 end_t=$SECONDS
 102 if [ $((end_t - start_t)) -lt 2 ]; then
 103     echo "$0: test ran too quickly"
 104     fail=1
 105 fi
 106
 107 # Check the handle was opened 3 times (first open + reopens).
 108 read open_count < retry-size-open-count
 109 if [ $open_count -ne 3 ]; then
 110     echo "$0: open-count ($open_count) != 3"
 111     fail=1
 112 fi
 113
 114 # Check that nbdkit checked bounds
 115 if [ -e retry-size-fail ]; then
 116     echo "$0: nbdkit read past EOF"
 117     fail=1
 118 fi
 119
 120 exit $fail