tests/test-retry-readonly.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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  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
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  22 # THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  23 # PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
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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 qemu-io --version
  38
  39 files="retry-readonly-count retry-readonly-open-count"
  40 rm -f $files
  41 cleanup_fn rm -f $files
  42
  43 touch retry-readonly-count retry-readonly-open-count
  44 start_t=$SECONDS
  45
  46 # Create a custom plugin which will test retrying.
  47 nbdkit -v -U - \
  48        sh - \
  49        --filter=retry retry-delay=1 retry-readonly=yes \
  50        --run 'qemu-io -f raw -c "w 0 512" -c "w 0 512" $nbd || :' <<'EOF'
  51 #!/usr/bin/env bash
  52 case "$1" in
  53     open)
  54         # Count how many times the connection is (re-)opened.
  55         read i < retry-readonly-open-count
  56         echo $((i+1)) > retry-readonly-open-count
  57         ;;
  58     can_write) ;;
  59     pwrite)
  60         # Fail 3 times then succeed - however, force-readonly means we will
  61         # never return here after the first failure.
  62         read i < retry-readonly-count
  63         ((i++))
  64         echo $i > retry-readonly-count
  65         if [ $i -le 3 ]; then
  66             echo "EIO pwrite failed" >&2
  67             exit 1
  68         else
  69             : drop data
  70         fi
  71         ;;
  72
  73     get_size) echo 512 ;;
  74     *) exit 2 ;;
  75 esac
  76 EOF
  77
  78 # In this test we should see 3 failures:
  79 # first pwrite FAILS
  80 # retry and wait 1 seconds
  81 # first pwrite FAILS immediately now that connection is readonly
  82 # second pwrite FAILS immediately
  83
  84 # The minimum time for the test should be 1 second.
  85 end_t=$SECONDS
  86 if [ $((end_t - start_t)) -lt 1 ]; then
  87     echo "$0: test ran too quickly"
  88     exit 1
  89 fi
  90
  91 # Check the handle was opened 2 times (first open + one reopen).
  92 read open_count < retry-readonly-open-count
  93 if [ $open_count -ne 2 ]; then
  94     echo "$0: open-count ($open_count) != 2"
  95     exit 1
  96 fi