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378 lines
11 KiB
Bash
378 lines
11 KiB
Bash
#!/usr/bin/env bash
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# group: rw
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#
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# Test FUSE exports (in ways that are not captured by the generic
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# tests)
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#
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# Copyright (C) 2020 Red Hat, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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seq=$(basename "$0")
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echo "QA output created by $seq"
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status=1 # failure is the default!
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_cleanup()
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{
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_cleanup_qemu
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_cleanup_test_img
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rmdir "$EXT_MP" 2>/dev/null
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rm -f "$EXT_MP"
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rm -f "$COPIED_IMG"
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}
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trap "_cleanup; exit \$status" 0 1 2 3 15
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# get standard environment, filters and checks
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. ./common.rc
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. ./common.filter
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. ./common.qemu
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# Generic format, but needs a plain filename
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_supported_fmt generic
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if [ "$IMGOPTSSYNTAX" = "true" ]; then
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_unsupported_fmt $IMGFMT
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fi
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# We need the image to have exactly the specified size, and VPC does
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# not allow that by default
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_unsupported_fmt vpc
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_supported_proto file # We create the FUSE export manually
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_supported_os Linux # We need /dev/urandom
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# $1: Export ID
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# $2: Options (beyond the node-name and ID)
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# $3: Expected return value (defaults to 'return')
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# $4: Node to export (defaults to 'node-format')
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fuse_export_add()
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{
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# The grep -v is a filter for errors when /etc/fuse.conf does not contain
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# user_allow_other. (The error is benign, but it is printed by fusermount
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# on the first mount attempt, so our export code cannot hide it.)
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_send_qemu_cmd $QEMU_HANDLE \
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"{'execute': 'block-export-add',
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'arguments': {
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'type': 'fuse',
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'id': '$1',
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'node-name': '${4:-node-format}',
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$2
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} }" \
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"${3:-return}" \
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| _filter_imgfmt \
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| grep -v 'option allow_other only allowed if'
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}
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# $1: Export ID
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fuse_export_del()
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{
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_send_qemu_cmd $QEMU_HANDLE \
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"{'execute': 'block-export-del',
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'arguments': {
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'id': '$1'
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} }" \
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'return'
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_send_qemu_cmd $QEMU_HANDLE \
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'' \
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'BLOCK_EXPORT_DELETED'
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}
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# Return the length of the protocol file
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# $1: Protocol node export mount point
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# $2: Original file (to compare)
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get_proto_len()
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{
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len1=$(stat -c '%s' "$1")
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len2=$(stat -c '%s' "$2")
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if [ "$len1" != "$len2" ]; then
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echo 'ERROR: Length of export and original differ:' >&2
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echo "$len1 != $len2" >&2
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else
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echo '(OK: Lengths of export and original are the same)' >&2
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fi
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echo "$len1"
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}
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COPIED_IMG="$TEST_IMG.copy"
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EXT_MP="$TEST_IMG.fuse"
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echo '=== Set up ==='
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# Create image with random data
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_make_test_img 64M
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$QEMU_IO -c 'write -s /dev/urandom 0 64M' "$TEST_IMG" | _filter_qemu_io
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_launch_qemu
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_send_qemu_cmd $QEMU_HANDLE \
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"{'execute': 'qmp_capabilities'}" \
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'return'
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# Separate blockdev-add calls for format and protocol so we can remove
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# the format layer later on
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_send_qemu_cmd $QEMU_HANDLE \
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"{'execute': 'blockdev-add',
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'arguments': {
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'driver': 'file',
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'node-name': 'node-protocol',
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'filename': '$TEST_IMG'
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} }" \
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'return'
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_send_qemu_cmd $QEMU_HANDLE \
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"{'execute': 'blockdev-add',
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'arguments': {
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'driver': '$IMGFMT',
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'node-name': 'node-format',
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'file': 'node-protocol'
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} }" \
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'return'
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echo
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echo '=== Mountpoint not present ==='
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rmdir "$EXT_MP" 2>/dev/null
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rm -f "$EXT_MP"
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output=$(fuse_export_add 'export-err' "'mountpoint': '$EXT_MP'" error)
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if echo "$output" | grep -q "Parameter 'type' does not accept value 'fuse'"; then
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_notrun 'No FUSE support'
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fi
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echo "$output"
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echo
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echo '=== Mountpoint is a directory ==='
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mkdir "$EXT_MP"
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fuse_export_add 'export-err' "'mountpoint': '$EXT_MP'" error
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rmdir "$EXT_MP"
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echo
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echo '=== Mountpoint is a regular file ==='
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touch "$EXT_MP"
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fuse_export_add 'export-mp' "'mountpoint': '$EXT_MP'"
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# Check that the export presents the same data as the original image
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$QEMU_IMG compare -f raw -F $IMGFMT -U "$EXT_MP" "$TEST_IMG"
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# Some quick chmod tests
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stat -c 'Permissions pre-chmod: %a' "$EXT_MP"
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# Verify that we cannot set +w
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chmod u+w "$EXT_MP" 2>&1 | _filter_testdir | _filter_imgfmt
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stat -c 'Permissions post-+w: %a' "$EXT_MP"
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# But that we can set, say, +x (if we are so inclined)
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chmod u+x "$EXT_MP" 2>&1 | _filter_testdir | _filter_imgfmt
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stat -c 'Permissions post-+x: %a' "$EXT_MP"
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echo
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echo '=== Mount over existing file ==='
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# This is the coolest feature of FUSE exports: You can transparently
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# make images in any format appear as raw images
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fuse_export_add 'export-img' "'mountpoint': '$TEST_IMG'"
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# Accesses both exports at the same time, so we get a concurrency test
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$QEMU_IMG compare -f raw -F raw -U "$EXT_MP" "$TEST_IMG"
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# Just to be sure, we later want to compare the data offline. Also,
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# this allows us to see that cp works without complaining.
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# (This is not a given, because cp will expect a short read at EOF.
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# Internally, qemu does not allow short reads, so we have to check
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# whether the FUSE export driver lets them work.)
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cp "$TEST_IMG" "$COPIED_IMG"
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# $TEST_IMG will be in mode 0400 because it is read-only; we are going
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# to write to the copy, so make it writable
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chmod 0600 "$COPIED_IMG"
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echo
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echo '=== Double export ==='
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# We have already seen that exporting a node twice works fine, but you
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# cannot export anything twice on the same mount point. The reason is
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# that qemu has to stat the given mount point, and this would have to
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# be answered by the same qemu instance if it already has an export
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# there. However, it cannot answer the stat because it is itself
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# caught up in that same stat.
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fuse_export_add 'export-err' "'mountpoint': '$EXT_MP'" error
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echo
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echo '=== Remove export ==='
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# Double-check that $EXT_MP appears as a non-empty file (the raw image)
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$QEMU_IMG info -f raw "$EXT_MP" | grep 'virtual size'
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fuse_export_del 'export-mp'
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# See that the file appears empty again
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$QEMU_IMG info -f raw "$EXT_MP" | grep 'virtual size'
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echo
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echo '=== Writable export ==='
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fuse_export_add 'export-mp' "'mountpoint': '$EXT_MP', 'writable': true"
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# Check that writing to the read-only export fails
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output=$($QEMU_IO -f raw -c 'write -P 42 1M 64k' "$TEST_IMG" 2>&1 \
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| _filter_qemu_io | _filter_testdir | _filter_imgfmt)
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# Expected reference output: Opening the file fails because it has no
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# write permission
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reference="Could not open 'TEST_DIR/t.IMGFMT': Permission denied"
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if echo "$output" | grep -q "$reference"; then
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echo "Writing to read-only export failed: OK"
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elif echo "$output" | grep -q "write failed: Permission denied"; then
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# With CAP_DAC_OVERRIDE (e.g. when running this test as root), the export
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# can be opened regardless of its file permissions, but writing will then
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# fail. This is not the result for which we want to test, so count this as
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# a SKIP.
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_casenotrun "Opening RO export as R/W succeeded, perhaps because of" \
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"CAP_DAC_OVERRIDE"
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# Still, write this to the reference output to make the test pass
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echo "Writing to read-only export failed: OK"
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else
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echo "Writing to read-only export failed: ERROR"
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echo "$output"
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fi
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# But here it should work
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$QEMU_IO -f raw -c 'write -P 42 1M 64k' "$EXT_MP" | _filter_qemu_io
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# (Adjust the copy, too)
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$QEMU_IO -f raw -c 'write -P 42 1M 64k' "$COPIED_IMG" | _filter_qemu_io
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echo
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echo '=== Resizing exports ==='
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# Here, we need to export the protocol node -- the format layer may
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# not be growable, simply because the format does not support it.
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# Remove all exports and the format node first so permissions will not
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# get in the way
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fuse_export_del 'export-mp'
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fuse_export_del 'export-img'
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_send_qemu_cmd $QEMU_HANDLE \
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"{'execute': 'blockdev-del',
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'arguments': {
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'node-name': 'node-format'
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} }" \
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'return'
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# Now export the protocol node
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fuse_export_add \
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'export-mp' \
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"'mountpoint': '$EXT_MP', 'writable': true" \
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'return' \
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'node-protocol'
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echo
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echo '--- Try growing non-growable export ---'
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# Get the current size so we can write beyond the EOF
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orig_len=$(get_proto_len "$EXT_MP" "$TEST_IMG")
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orig_disk_usage=$(stat -c '%b' "$TEST_IMG")
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# Should fail (exports are non-growable by default)
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# (Note that qemu-io can never write beyond the EOF, so we have to use
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# dd here)
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dd if=/dev/zero of="$EXT_MP" bs=1 count=64k seek=$orig_len 2>&1 \
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| _filter_testdir | _filter_imgfmt
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echo
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echo '--- Resize export ---'
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# But we can truncate it explicitly; even with fallocate
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fallocate -o "$orig_len" -l 64k "$EXT_MP"
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new_len=$(get_proto_len "$EXT_MP" "$TEST_IMG")
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if [ "$new_len" != "$((orig_len + 65536))" ]; then
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echo 'ERROR: Unexpected post-truncate image size:'
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echo "$new_len != $((orig_len + 65536))"
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else
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echo 'OK: Post-truncate image size is as expected'
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fi
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new_disk_usage=$(stat -c '%b' "$TEST_IMG")
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if [ "$new_disk_usage" -gt "$orig_disk_usage" ]; then
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echo 'OK: Disk usage grew with fallocate'
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else
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echo 'ERROR: Disk usage did not grow despite fallocate:'
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echo "$orig_disk_usage => $new_disk_usage"
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fi
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echo
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echo '--- Try growing growable export ---'
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# Now export as growable
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fuse_export_del 'export-mp'
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fuse_export_add \
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'export-mp' \
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"'mountpoint': '$EXT_MP', 'writable': true, 'growable': true" \
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'return' \
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'node-protocol'
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# Now we should be able to write beyond the EOF
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dd if=/dev/zero of="$EXT_MP" bs=1 count=64k seek=$new_len 2>&1 \
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| _filter_testdir | _filter_imgfmt
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new_len=$(get_proto_len "$EXT_MP" "$TEST_IMG")
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if [ "$new_len" != "$((orig_len + 131072))" ]; then
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echo 'ERROR: Unexpected post-grow image size:'
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echo "$new_len != $((orig_len + 131072))"
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else
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echo 'OK: Post-grow image size is as expected'
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fi
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echo
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echo '--- Shrink export ---'
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# Now go back to the original size
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truncate -s "$orig_len" "$EXT_MP"
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new_len=$(get_proto_len "$EXT_MP" "$TEST_IMG")
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if [ "$new_len" != "$orig_len" ]; then
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echo 'ERROR: Unexpected post-truncate image size:'
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echo "$new_len != $orig_len"
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else
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echo 'OK: Post-truncate image size is as expected'
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fi
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echo
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echo '=== Tear down ==='
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_send_qemu_cmd $QEMU_HANDLE \
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"{'execute': 'quit'}" \
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'return'
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wait=yes _cleanup_qemu
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echo
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echo '=== Compare copy with original ==='
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$QEMU_IMG compare -f raw -F $IMGFMT "$COPIED_IMG" "$TEST_IMG"
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# success, all done
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echo "*** done"
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rm -f $seq.full
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status=0
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