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6 # modification, are permitted provided that the following conditions are
9 # * Redistributions of source code must retain the above copyright
10 # notice, this list of conditions and the following disclaimer.
12 # * Redistributions in binary form must reproduce the above copyright
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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.
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,
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30 # OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 # Check various .cache scenarios using eval
41 requires
dd iflag
=count_bytes
</dev
/null
43 files
="eval-cache.witness eval-cache.cache"
45 cleanup_fn
rm -f $files
47 # This plugin requests nbdkit to emulate caching with pread. When the witness
48 # file exists, cache reads; when absent, reads fail if not already cached.
49 export witness
="$PWD/eval-cache.witness"
50 export cache
="$PWD/eval-cache.cache"
55 witness = os.getenv("witness")
58 open(path, "a").close()
60 # Test that uncached read fails
62 h.pread(1024 * 1024, 0)
63 except nbd.Error as ex:
64 assert ex.errnum == errno.EIO
66 # Cache the entire image; nbdkit should break it into 64M preads
68 h.cache(h.get_size(), 0)
71 # Now read should succeed
72 buf = h.pread(64 * 1024 * 1024, 64 * 1024 * 1024)
73 if hasattr(buf, "is_zero"):
77 get_size
='echo 128M' can_cache
='echo emulate' open
='touch "$cache"' \
79 if test -f "$witness"; then
80 echo "$3 $4" >> "$cache"
81 elif ! grep -q "^$3 $4$" "$cache"; then
84 dd if=/dev/zero count=$3 iflag=count_bytes
85 ' --run 'nbdsh -u "$uri" -c "$script"'
87 # This plugin provides .cache but not .can_cache; eval should synthesize one.
89 get_size
='echo 1M' cache
='exit 0' pread
='echo EIO >&2; exit 1' \
90 --run 'nbdsh -u "$uri" -c "assert h.can_cache()" \
91 -c "h.cache(1024*1024, 0)"'