Symbols exported by libshared can't get pruned by the linker, so
every unused exported symbol is effectively dead code we ship to users
for no good reason. Let's add a script to analyze how many such symbols
we have.
We also add a meson test to run the script on all of our binaries.
Since it detects unused symbols and still has a few false positives,
don't enable the test by default similar to the clang-tidy tests.
The script was 100% vibe coded by Github Copilot with Claude Sonnet 4.5
as the model.
Current results are (without the unused symbols list):
Analysis of libsystemd-shared-259.so
======================================================================
Total exported symbols: 4830
(excluding public API symbols starting with 'sd_')
Used symbols: 4672
Unused symbols: 158
Usage rate: 96.7%
In logs in the Fedora OpenQA CI:
Nov 17 22:20:06 fedora systemd-ssh-generator[4117]: Failed to query local AF_VSOCK CID: Cannot assign requested address
Nov 17 22:20:06 fedora (generato[4088]: /usr/lib/systemd/system-generators/systemd-ssh-generator failed with exit status 1.
Nov 17 22:20:06 fedora systemd[1]: sshd-vsock.socket: Unit configuration changed while unit was running, and no socket file descriptors are open. Unit not functional until restarted.
AF_VSOCK is not configured there and systemd-ssh-generator should just exit
quietly. vsock_get_local_cid() already does some logging at debug level, so we
don't need to.
There is also a second bug, we report modifications to the unit have just
created. I think we have an issue open for this somewhere, but cannot find it.
`systemd.network(5)` recommends “that each filename is prefixed with a number
smaller than "70" (e.g. 10-eth0.network)”.
Reduce that used by the example accordingly, but stay above the number (`50`)
used in the earlier example for static configuration, so that would take
precedence over the dynamic one if both match for the same network.
This updates example output in systemd-analyze's man page after the
tool's output was changed in a previous commit.
Additionally bash completion is added for `systemd-analyze filesystems`
and improved for `systemd-analyze calendar`.
Before:
$ build/systemd-creds --uid=asdf
Failed to resolve user 'asdf': No such process
Now:
$ build/systemd-creds --uid=asdf
Failed to resolve user 'asdf': Unknown user
$ sudo build/systemd-run --uid=asdf whoami
$ journalctl -e
(whoami)[1007784]: run-p1007782-i5200512.service: Failed to determine user credentials: No such process
(whoami)[1007784]: run-p1007782-i5200512.service: Failed at step USER spawning /usr/sbin/whoami: No such process
systemd[1]: run-p1007782-i5200512.service: Main process exited, code=exited, status=217/USER
systemd[1]: run-p1007782-i5200512.service: Failed with result 'exit-code'.
Now:
(whoami)[1013204]: run-p1013202-i5205932.service: Failed to determine credentials for user 'asdf': Unknown user
(whoami)[1013204]: run-p1013202-i5205932.service: Failed at step USER spawning /usr/sbin/whoami: Invalid argument
systemd[1]: run-p1013202-i5205932.service: Main process exited, code=exited, status=217/USER
systemd[1]: run-p1013202-i5205932.service: Failed with result 'exit-code'.
Before:
$ sudo build/systemd-run --scope --uid=asdf whoami
Failed to resolve user asdf: No such process
Now:
$ sudo build/systemd-run --scope --uid=asdf whoami
Failed to resolve user 'asdf': Unknown user
From a boot with a dracut initrd:
systemd-tmpfiles[242]: /usr/lib/tmpfiles.d/tpm2-tss-fapi.conf:2: Failed to resolve user 'tss': No such process
systemd-tmpfiles[242]: Failed to parse ACL "default:group:tss:rwx", ignoring: Invalid argument
systemd-tmpfiles[242]: /usr/lib/tmpfiles.d/tpm2-tss-fapi.conf:4: Failed to resolve user 'tss': No such process
systemd-tmpfiles[242]: Failed to parse ACL "default:group:tss:rwx", ignoring: Invalid argument
systemd-tmpfiles[242]: /usr/lib/tmpfiles.d/tpm2-tss-fapi.conf:6: Failed to resolve group 'tss': No such process
systemd-tmpfiles[242]: /usr/lib/tmpfiles.d/tpm2-tss-fapi.conf:7: Failed to resolve group 'tss': No such process
We cannot just use %m, because strerror returns a confusing error message
for ESRCH or ENOEXEC. udev code was doing a good job, but the error handling
was very verbose. Let's encapsulate the customized error messages in a
helper.
No functional change, except that the error messages have a slightly different
form now. The old messages were a bit better, but we don't have as much
flexibility in the new scheme. "Failed to resolve user 'foo': Unknown user"
should be good enough.
systemd-networkd cannot create the directory /run/systemd/resolve.hook/. Even
if the directory exists, it is not owned by systemd-network user/group, so
systemd-networkd cannot create socket file in the directory. Hence, if the
systemd-networkd-resolve-hook.socket unit is disabled, networkd fails to open
the varlink socket, and fail to start:
systemd-networkd[1304645]: Failed to bind to systemd-resolved hook Varlink socket: Permission denied
systemd-networkd[1304645]: Could not set up manager: Permission denied
systemd[1]: systemd-networkd.service: Main process exited, code=exited, status=1/FAILURE
systemd[1]: systemd-networkd.service: Failed with result 'exit-code'.
systemd[1]: Failed to start systemd-networkd.service - Network Management.
If the socket unit is disabled, that should mean the system administrator wants
to disable the feature. Let's not try to setup the varlink socket in that case.
Now the resolve hook feature can be toggled by enabling/disabling the socket
unit, let's drop the $SYSTEMD_NETWORK_RESOLVE_HOOK environment variable.
Follow-up for a7fa29b1b5.
Co-authored-by: Yu Watanabe <watanabe.yu+github@gmail.com>
The output of `systemd-analyze exit-status` changed in commit
e04ed6db6b, so that the exit-status class
for EXIT_SUCCESS and EXIT_FAILURE is "libc" instead of "glibc".
This commit makes the example output in the man-page match the actual
output again.
The semantics of reload is that the service updates its extrinsic state
and continues execution. If it actually deactivated we shouldn't
spuriously notify the caller that reload succeeded.
Installed jobs are always collapsed, i.e. can only be of types
accepted by job_run_and_invalidate() modulo JOB_NOP which is
stored in Unit.nop_job (if any). Let's trim the unreachable
branches.
This reverts commit 3ae7d8fd87.
Now utmp support is always disabled when building with musl,
and all definitions are unused in that case. Let's remove it.
This reverts commit bf9bc5beb0.
libutmps does not support utmpxname(), the function always fails
with ENOSYS, and always uses their own file.
However, our code relies on the funtion needs to succeed.
Let's revert the change now, and revisit later when musl users
request to support libutmps.
See https://gitlab.gnome.org/GNOME/glib/-/issues/2931 for the changes in
GLib upstream. Using `GMemoryMonitor` is now more compliant with the
systemd recommended approach, but it needs further work to read the
recommended environment variables rather than unconditionally accessing
the per-cgroup PSI kernel file directly.
Signed-off-by: Philip Withnall <pwithnall@gnome.org>
Martin Hundebøll
Zbigniew Jędrzejewski-Szmek
Daan De Meyer
Christoph Anton Mitterer
Luca Boccassi
Simon Barth
Frantisek Sumsal
Armin Brauns
Mike Yuan
Yu Watanabe
Luca Boccassi
Philip Withnall
Lennart Poettering