tests/test-truncate4.sh

   1 #!/usr/bin/env bash
   2 # nbdkit
   3 # Copyright (C) 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 # Regression test when next_ops->get_size changes between connections.
  34 # For now, NBD does not support dynamic resize; but the file plugin
  35 # reads size from the file system for each new connection, at which
  36 # point the client remembers that size for the life of the connection.
  37 # We are testing that connection A can still see the tail of a file,
  38 # even when connection B is opened while the file was temporarily
  39 # shorter (if the actions of connection B affect the size visible
  40 # through connection A, we didn't isolate per-connection state).
  41
  42 source ./functions.sh
  43 set -e
  44 set -x
  45
  46 requires qemu-io --version
  47
  48 sock=`mktemp -u`
  49 files="truncate4.out truncate4.pid $sock truncate4.data"
  50 rm -f $files
  51 cleanup_fn rm -f $files
  52
  53 # Initial file contents: 1k of pattern 1
  54 truncate -s 1024 truncate4.data
  55 qemu-io -c 'w -P 1 0 1024' -f raw truncate4.data
  56
  57 # Run nbdkit with file plugin and truncate filter in front.
  58 start_nbdkit -P truncate4.pid -U $sock \
  59        --filter=truncate \
  60        file truncate4.data \
  61        round-up=1024
  62
  63 fail=0
  64 exec 4>&1 # Save original stdout
  65 {
  66     exec 5>&1 >&4 # Save connection A, set stdout back to original
  67     echo 'Reading from connection A, try 1'
  68     echo 'r -P 1 0 1024' >&5
  69     sleep 1
  70     echo 'Resizing down'
  71     truncate -s 512 truncate4.data
  72     echo 'Reading from connection B'
  73     echo 'r -P 1 0 512' | qemu-io -f raw nbd:unix:$sock >> truncate4.out
  74     echo 'Restoring size'
  75     truncate -s 1024 truncate4.data
  76     qemu-io -c 'w -P 2 0 1024' -f raw truncate4.data
  77     echo 'Reading from connection A, try 2'
  78     echo 'r -P 2 512 512' >&5
  79     echo 'quit' >&5
  80 } | qemu-io -f raw nbd:unix:$sock >> truncate4.out || fail=1
  81 exec 4>&-
  82
  83 cat truncate4.out
  84 grep 'Pattern verification failed' truncate4.out && fail=1
  85 exit $fail