tests/test-retry-readonly.sh

   1 #!/usr/bin/env bash
   2 # nbdkit
   3 # Copyright (C) 2018-2020 Red Hat Inc.
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   5 # Redistribution and use in source and binary forms, with or without
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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
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  17 # used to endorse or promote products derived from this software without
  18 # specific prior written permission.
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  20 # THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
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  23 # PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
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  32
  33 source ./functions.sh
  34 set -e
  35 set -x
  36
  37 requires_plugin sh
  38 requires qemu-io --version
  39
  40 files="retry-readonly-count retry-readonly-open-count"
  41 rm -f $files
  42 cleanup_fn rm -f $files
  43
  44 touch retry-readonly-count retry-readonly-open-count
  45 start_t=$SECONDS
  46
  47 # Create a custom plugin which will test retrying.
  48 nbdkit -v -U - \
  49        sh - \
  50        --filter=retry retry-delay=1 retry-readonly=yes \
  51        --run 'qemu-io -f raw -c "w 0 512" -c "w 0 512" $nbd || :' <<'EOF'
  52 #!/usr/bin/env bash
  53 case "$1" in
  54     open)
  55         # Count how many times the connection is (re-)opened.
  56         read i < retry-readonly-open-count
  57         echo $((i+1)) > retry-readonly-open-count
  58         ;;
  59     can_write) ;;
  60     pwrite)
  61         # Fail 3 times then succeed - however, force-readonly means we will
  62         # never return here after the first failure.
  63         read i < retry-readonly-count
  64         ((i++))
  65         echo $i > retry-readonly-count
  66         if [ $i -le 3 ]; then
  67             echo "EIO pwrite failed" >&2
  68             exit 1
  69         else
  70             : drop data
  71         fi
  72         ;;
  73
  74     get_size) echo 512 ;;
  75     *) exit 2 ;;
  76 esac
  77 EOF
  78
  79 # In this test we should see 3 failures:
  80 # first pwrite FAILS
  81 # retry and wait 1 seconds
  82 # first pwrite FAILS immediately now that connection is readonly
  83 # second pwrite FAILS immediately
  84
  85 # The minimum time for the test should be 1 second.
  86 end_t=$SECONDS
  87 if [ $((end_t - start_t)) -lt 1 ]; then
  88     echo "$0: test ran too quickly"
  89     exit 1
  90 fi
  91
  92 # Check the handle was opened 2 times (first open + one reopen).
  93 read open_count < retry-readonly-open-count
  94 if [ $open_count -ne 2 ]; then
  95     echo "$0: open-count ($open_count) != 2"
  96     exit 1
  97 fi