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211a3d87fb
When combined with a tmpfs on /run or /var/lib, allows to create arbitrary and ephemeral symlinks for StateDirectory or RuntimeDirectory. This is especially useful when sharing these directories between different services, to make the same state/runtime directory 'backend' appear as different names to each service, so that they can be added/removed to a sharing agreement transparently, without code changes. An example (simplified, but real) use case: foo.service: StateDirectory=foo bar.service: StateDirectory=bar foo.service.d/shared.conf: StateDirectory= StateDirectory=shared:foo bar.service.d/shared.conf: StateDirectory= StateDirectory=shared:bar foo and bar use respectively /var/lib/foo and /var/lib/bar. Then the orchestration layer decides to stop this sharing, the drop-in can be removed. The services won't need any update and will keep working and being able to store state, transparently. To keep backward compatibility, new DBUS messages are added.
98 lines
4.6 KiB
Bash
Executable File
98 lines
4.6 KiB
Bash
Executable File
#!/usr/bin/env bash
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# SPDX-License-Identifier: LGPL-2.1-or-later
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set -eux
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set -o pipefail
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systemd-analyze log-level debug
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systemd-analyze log-target console
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function test_directory() {
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local directory="$1"
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local path="$2"
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# Set everything up without DynamicUser=1
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systemd-run --wait -p RuntimeDirectoryPreserve=yes -p DynamicUser=0 -p "${directory}"=zzz touch "${path}"/zzz/test
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systemd-run --wait -p RuntimeDirectoryPreserve=yes -p DynamicUser=0 -p "${directory}"=zzz test -f "${path}"/zzz/test
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systemd-run --wait -p RuntimeDirectoryPreserve=yes -p DynamicUser=0 -p "${directory}"=zzz -p TemporaryFileSystem="${path}" test -f "${path}"/zzz/test
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systemd-run --wait -p RuntimeDirectoryPreserve=yes -p DynamicUser=0 -p "${directory}"=zzz:yyy test -f "${path}"/yyy/test
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systemd-run --wait -p RuntimeDirectoryPreserve=yes -p DynamicUser=0 -p "${directory}"=zzz:xxx -p TemporaryFileSystem="${path}" test -f "${path}"/xxx/test
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systemd-run --wait -p RuntimeDirectoryPreserve=yes -p DynamicUser=0 -p "${directory}"=zzz:xxx -p TemporaryFileSystem="${path}":ro test -f "${path}"/xxx/test
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systemd-run --wait -p RuntimeDirectoryPreserve=yes -p DynamicUser=0 -p "${directory}"=zzz test -f "${path}"/zzz/test-missing \
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&& { echo 'unexpected success'; exit 1; }
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test -d "${path}"/zzz
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test ! -L "${path}"/zzz
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test ! -e "${path}"/private/zzz
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test -f "${path}"/zzz/test
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test ! -f "${path}"/zzz/test-missing
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# Convert to DynamicUser=1
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systemd-run --wait -p RuntimeDirectoryPreserve=yes -p DynamicUser=1 -p "${directory}"=zzz test -f "${path}"/zzz/test
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systemd-run --wait -p RuntimeDirectoryPreserve=yes -p DynamicUser=1 -p "${directory}"=zzz -p TemporaryFileSystem="${path}" test -f "${path}"/zzz/test
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systemd-run --wait -p RuntimeDirectoryPreserve=yes -p DynamicUser=1 -p "${directory}"=zzz:yyy test -f "${path}"/yyy/test
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systemd-run --wait -p RuntimeDirectoryPreserve=yes -p DynamicUser=1 -p "${directory}"=zzz:xxx -p TemporaryFileSystem="${path}" test -f "${path}"/xxx/test
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systemd-run --wait -p RuntimeDirectoryPreserve=yes -p DynamicUser=1 -p "${directory}"=zzz:xxx -p TemporaryFileSystem="${path}":ro test -f "${path}"/xxx/test
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systemd-run --wait -p RuntimeDirectoryPreserve=yes -p DynamicUser=1 -p "${directory}"=zzz test -f "${path}"/zzz/test-missing \
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&& { echo 'unexpected success'; exit 1; }
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test -L "${path}"/zzz
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test -L "${path}"/yyy
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test -d "${path}"/private/zzz
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test ! -L "${path}"/private/xxx
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test ! -L "${path}"/xxx
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test -f "${path}"/zzz/test
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test ! -f "${path}"/zzz/test-missing
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# Convert back
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systemd-run --wait -p RuntimeDirectoryPreserve=yes -p DynamicUser=0 -p "${directory}"=zzz test -f "${path}"/zzz/test
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systemd-run --wait -p RuntimeDirectoryPreserve=yes -p DynamicUser=0 -p "${directory}"=zzz -p TemporaryFileSystem="${path}" test -f "${path}"/zzz/test
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systemd-run --wait -p RuntimeDirectoryPreserve=yes -p DynamicUser=0 -p "${directory}"=zzz:yyy test -f "${path}"/yyy/test
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systemd-run --wait -p RuntimeDirectoryPreserve=yes -p DynamicUser=0 -p "${directory}"=zzz:xxx -p TemporaryFileSystem="${path}" test -f "${path}"/xxx/test
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systemd-run --wait -p RuntimeDirectoryPreserve=yes -p DynamicUser=0 -p "${directory}=zzz:xxx zzz:xxx2" -p TemporaryFileSystem="${path}" bash -c "test -f ${path}/xxx/test && test -f ${path}/xxx2/test"
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systemd-run --wait -p RuntimeDirectoryPreserve=yes -p DynamicUser=0 -p "${directory}"=zzz:xxx -p TemporaryFileSystem="${path}":ro test -f "${path}"/xxx/test
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systemd-run --wait -p RuntimeDirectoryPreserve=yes -p DynamicUser=0 -p "${directory}"=zzz test -f "${path}"/zzz/test-missing \
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&& { echo 'unexpected success'; exit 1; }
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# Exercise the unit parsing paths too
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cat >/run/systemd/system/testservice-34.service <<EOF
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[Service]
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Type=oneshot
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TemporaryFileSystem=${path}
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RuntimeDirectoryPreserve=yes
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${directory}=zzz:x\:yz zzz:x\:yz2
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ExecStart=test -f ${path}/x:yz2/test
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ExecStart=test -f ${path}/x:yz/test
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ExecStart=test -f ${path}/zzz/test
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EOF
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systemctl daemon-reload
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systemctl start --wait testservice-34.service
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test -d "${path}"/zzz
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test ! -L "${path}"/xxx
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test ! -L "${path}"/xxx2
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test ! -L "${path}"/private/xxx
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test ! -L "${path}"/private/xxx2
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test -L "${path}"/yyy
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test ! -L "${path}"/zzz
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test ! -e "${path}"/private/zzz
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test -f "${path}"/zzz/test
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test ! -f "${path}"/zzz/test-missing
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test ! -L "${path}"/x:yz
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test ! -L "${path}"/x:yz2
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}
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test_directory "StateDirectory" "/var/lib"
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test_directory "RuntimeDirectory" "/run"
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test_directory "CacheDirectory" "/var/cache"
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test_directory "LogsDirectory" "/var/log"
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systemd-analyze log-level info
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echo OK >/testok
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exit 0
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