tests/test-retry-reopen-fail.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
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   8 #
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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 #
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  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
  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 # This test is similar to test-retry.sh but it also tests the case
  34 # where the reopen operation fails.
  35
  36 source ./functions.sh
  37 set -e
  38 set -x
  39
  40 requires qemu-img --version
  41
  42 files="retry-reopen-fail.img
  43        retry-reopen-fail-count retry-reopen-fail-open-count"
  44 rm -f $files
  45 cleanup_fn rm -f $files
  46
  47 touch retry-reopen-fail-count retry-reopen-fail-open-count
  48 start_t=$SECONDS
  49
  50 # Create a custom plugin which will test retrying.
  51 nbdkit -v -U - \
  52        sh - \
  53        --filter=retry retry-delay=1 \
  54        --run 'qemu-img convert $nbd retry-reopen-fail.img' <<'EOF'
  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-reopen-fail-open-count
  60         ((i++))
  61         echo $i > retry-reopen-fail-open-count
  62         if [ $i -eq 2 ]; then
  63             echo "EIO open failed" >&2
  64             exit 1
  65         fi
  66         ;;
  67     pread)
  68         # Fail 2 times then succeed.
  69         read i < retry-reopen-fail-count
  70         ((i++))
  71         echo $i > retry-reopen-fail-count
  72         if [ $i -le 2 ]; then
  73             echo "EIO pread failed" >&2
  74             exit 1
  75         else
  76             dd if=/dev/zero count=$3 iflag=count_bytes
  77         fi
  78         ;;
  79
  80     get_size) echo 512 ;;
  81     *) exit 2 ;;
  82 esac
  83 EOF
  84
  85 # In this test we should see 3 failures:
  86 # pread FAILS
  87 # retry and wait 1 seconds
  88 # open FAILS
  89 # retry and wait 2 seconds
  90 # open succeeds
  91 # pread FAILS
  92 # retry and wait 4 seconds
  93 # open succeeds
  94 # pread succeeds
  95
  96 # The minimum time for the test should be 1+2+4 = 7 seconds.
  97 end_t=$SECONDS
  98 if [ $((end_t - start_t)) -lt 7 ]; then
  99     echo "$0: test ran too quickly"
 100     exit 1
 101 fi
 102
 103 # Check the handle was opened 4 times.
 104 read open_count < retry-reopen-fail-open-count
 105 if [ $open_count -ne 4 ]; then
 106     echo "$0: open-count ($open_count) != 4"
 107     exit 1
 108 fi