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This introduces `ExitType=main|cgroup` for services.
Similar to how `Type` specifies the launch of a service, `ExitType` is
concerned with how systemd determines that a service exited.
- If set to `main` (the current behavior), the service manager will consider
the unit stopped when the main process exits.
- The `cgroup` exit type is meant for applications whose forking model is not
known ahead of time and which might not have a specific main process.
The service will stay running as long as at least one process in the cgroup
is running. This is intended for transient or automatically generated
services, such as graphical applications inside of a desktop environment.
Motivation for this is #16805. The original PR (#18782) was reverted (#20073)
after realizing that the exit status of "the last process in the cgroup" can't
reliably be known (#19385)
This version instead uses the main process exit status if there is one and just
listens to the cgroup empty event otherwise.
The advantages of a service with `ExitType=cgroup` over scopes are:
- Integrated logging / stdout redirection
- Avoids the race / synchronisation issue between launch and scope creation
- More extensive use of drop-ins and thus distro-level configuration:
by moving from scopes to services we can have drop ins that will affect
properties that can only be set during service creation,
like `OOMPolicy` and security-related properties
- It makes systemd-xdg-autostart-generator usable by fixing [1], as obviously
only services can be used in the generator, not scopes.
[1] https://bugs.kde.org/show_bug.cgi?id=433299
The new lvm autoactivation method runs `vgchange` via
`systemd-run --no-block`[0], which means that checking if the unit
is in the `active` state is not enough, since the main binary might
still be running. Let's fix this by waiting until the unit reaches
the `exited` sub state.
Follow-up to:
* 29f8bef05e
* e50d743f99
[0] https://sourceware.org/git/?p=lvm2.git;a=blob;f=udev/69-dm-lvm.rules.in;h=39e5b98074010745f78a7a86a05929700c9cd690;hb=67722b312390cdab29c076c912e14bd739c5c0f6#l83
Example:
```
[ 17.102002] systemd-udevd[282]: sdf: '/usr/bin/systemd-run -r --no-block --property DefaultDependencies=no --unit lvm-activate-iscsi_lvm2212 /usr/bin/lvm vgchange -aay --nohints iscsi_lvm2212'(err) 'Running as unit: lvm-activate-iscsi_>
[ 17.102522] systemd-udevd[282]: sdf: Process '/usr/bin/systemd-run -r --no-block --property DefaultDependencies=no --unit lvm-activate-iscsi_lvm2212 /usr/bin/lvm vgchange -aay --nohints iscsi_lvm2212' succeeded.
[ 17.102697] systemd-udevd[282]: sdf: Adding watch on '/dev/sdf'
[ 17.104944] systemd[1]: lvm-activate-iscsi_lvm2212.service: Changed dead -> running
...
[ 17.105434] systemd[1]: Started /usr/bin/lvm vgchange -aay --nohints iscsi_lvm2212.
[ 17.105601] systemd[931]: lvm-activate-iscsi_lvm2212.service: Executing: /usr/bin/lvm vgchange -aay --nohints iscsi_lvm2212
...
[ 17.420228] testsuite-64.sh[268]: + systemctl -q is-active lvm-activate-iscsi_lvm2212.service
[ 17.420228] testsuite-64.sh[268]: + return 0
[ 17.420228] testsuite-64.sh[268]: + test -e /dev/disk/by-path/ip-127.0.0.1:3260-iscsi-iqn.2021-09.com.example:iscsi.lvm.test-lun-4
[ 17.420228] testsuite-64.sh[268]: + udevadm settle
[ 17.420228] testsuite-64.sh[268]: + test -e /dev/iscsi_lvm2212/mypart1
...
[ 17.451313] systemd[1]: testsuite-64.service: Main process exited, code=exited, status=1/FAILURE
[ 17.451475] systemd[1]: testsuite-64.service: Failed with result 'exit-code'.
...
[ 17.555759] systemd[1]: Starting End the test...
[ 17.556972] sh[941]: + systemctl poweroff --no-block
...
[ 17.688923] lvm[931]: 2 logical volume(s) in volume group "iscsi_lvm2212" now active
...
[ 17.838484] systemd[1]: lvm-activate-iscsi_lvm2212.service: Child 931 belongs to lvm-activate-iscsi_lvm2212.service.
[ 17.838718] systemd[1]: lvm-activate-iscsi_lvm2212.service: Main process exited, code=exited, status=0/SUCCESS (success)
```
In some cases an offline analysis should ignore some fields, for example
a portable service in an image will never list RootImage/RootDirectory, as
they are added at runtime, and thus can be skipped.
Alternative to https://github.com/systemd/systemd/pull/20531.
Whenever a service triggered by another unit fails condition checks,
stop the triggering unit to prevent systemd busy looping trying to
start the triggered unit.
This test makes assumptions on the availability of some mappings contained in
kbd-model-map and therefore strongly relies on the version shipped by
upstream. IOW the test is likely to fail if it's installed on a system with a
more comprehensive kbd-model-map.
This patch makes the upstream kbd-model-map file available via a symlink in
test/testdata/test-keymap-util dir and makes sure that this specific version is
always used by test-keymap-util regardless of whether the test is installed and
run on a different system or directly run (optionally via meson) from the
project working dir.
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.
The /var/lib/private/foo -> /var/lib/foo symlink for StateDirectory and
DynamicUser is set up on the host filesystem, before the mount namespacing
is brought up. If an empty /var/lib is used, to ensure the service does not
see other services data, the symlink is then not available despite
/var/lib/private being set up as expected.
Make a list of symlinks that need to be set up, and create them after all
the namespaced filesystems have been created, but before any eventual
read-only switch is flipped.
Previously, the prefix delegation is enabled when at least one
downstream interfaces request it. But, when the DHCPv6 client on the
upstream interface is configured, some downstream interfaces may not
exist yet, nor have .network file assigned.
Also, if a system has thousands of interfaces, then the previous logic
introduce O(n^2) search.
This makes the prefix delegation is always enabled, except when it is
explicitly disabled. Hopefully, that should not break anything, as the
DHCPv6 server should ignore the prefix delegation request if the server
do not have any prefix to delegate.
Collecting coverage causes a significant slowdown in general, but since
this test requires certain timing, we need to tweak the defaults to make
it reliably pass.
Depending on the location of the original build dir, either ProtectHome=
or ProtectSystem= may get in the way when creating the gcov metadata
files.
Follow-up to:
* 02d7e73013
* 6c9efba677
Otherwise we miss quite a lot of coverage (mainly from logind,
hostnamed, networkd, and possibly others), since they can't write their
reports with `ProtectSystem=strict`.
With `ProtectSystem=strict` gcov is unable to write the *.gcda files
with collected coverage. Let's add a yet another switch to make such
restriction less strict to make gcov happy.
This addresses following errors:
```
...
systemd-networkd[272469]: profiling:/systemd-meson-build/src/shared/libsystemd-shared-249.a.p/binfmt-util.c.gcda:Cannot open
systemd-networkd[272469]: profiling:/systemd-meson-build/src/shared/libsystemd-shared-249.a.p/base-filesystem.c.gcda:Cannot open
systemd-networkd[272469]: profiling:/systemd-meson-build/src/shared/libsystemd-shared-249.a.p/barrier.c.gcda:Cannot open
systemd-networkd[272469]: profiling:/systemd-meson-build/src/shared/libsystemd-shared-249.a.p/ask-password-api.c.gcda:Cannot open
systemd-networkd[272469]: profiling:/systemd-meson-build/src/shared/libsystemd-shared-249.a.p/apparmor-util.c.gcda:Cannot open
systemd-networkd[272469]: profiling:/systemd-meson-build/src/shared/libsystemd-shared-249.a.p/acpi-fpdt.c.gcda:Cannot open
...
```
When playing around with the coverage-enabled build I kept hitting
an issue where dnsmasq failed to start because the previous instance was
still shutting down. This should, hopefully, help to mitigate that.
