On distros like SUSE where ssh config dropins in /usr are supported, there's no
need for a symlink in /etc/ssh/ssh_config.d/ that points to the dropin
installed somewhere in /usr (that is not reachable by ssh).
For run0 (as opposed to systemd-run in general), connecting to
the system bus (of localhost or container) as a different user
than root and then trying to elevate privilege from that
makes little sense:
https://github.com/systemd/systemd/issues/32997#issuecomment-2127992973
The @ syntax is mostly useful when connecting to the user bus,
which is not a use case for run0. Hence, let's remove the example.
The syntax will be properly refused in #32999.
With 430cc5d3ab,
the value of GENHD_FL_NO_PART, previously named as GENHD_FL_NO_PART_SCAN,
is changed from 0x0200 to 0x0004. So, we need to check both flags.
"journalctl -u foo.service" may not work as expected, especially entries
for _TRANSPORT=stdout, for short-living services or when the service manager
generates debugging logs. Instead, SYSLOG_IDENTIFIER= should be reliable for
stdout. Let's use it.
An example case:
```
__CURSOR=s=06278e3bf011458e973c81d370a8f7a5;i=1e4dc;b=1b0258a5c78341609bf462c72d4541c3;m=308de65;t=6194c3895a13f;x=50c7e9af5b8cfc37
__REALTIME_TIMESTAMP=1716665017803071
__MONOTONIC_TIMESTAMP=50912869
_BOOT_ID=1b0258a5c78341609bf462c72d4541c3
SYSLOG_FACILITY=3
_UID=0
_GID=0
_MACHINE_ID=d3490e076ab24968bfa19a6aab26beb3
_HOSTNAME=H
_RUNTIME_SCOPE=system
_TRANSPORT=stdout
PRIORITY=6
_PID=2668
_STREAM_ID=3f9b8855636041988d003a9c63379b8a
SYSLOG_IDENTIFIER=echo
MESSAGE=foo
```
As you can see, there is no unit identifier.
Follow-up for 14631951ce
Before this commit, if WorkingDirectory= is empty or literally "-",
'simplified' is not populated, resulting in the ASSERT_PTR
in unit_write_settingf() below getting triggered.
Also, do not accept "-", so that the parser is consistent
with load-fragment.c
Fixes#33015
After soft-reboot, /var/log/journal may be initially read-only,
and becomes writable a bit later. In such case, runtime journal is
initially opened by journald. Hence, we need to flush to /var when it is
ready.
If the runtime journal is opened, we will anyway write journal entries
to the runtime journal, even if the persistent journal is writable.
Hence, we need to flush the runtime journal file later.
So, we need to try to read timezone several times.
Also, on failure, show journal of timedated instead of hostnamed,
as the timezone is handled by timedated.
Hopefully fixes#33007.
If an initrd has an empty or uninitialized /etc/machine-id file,
then PID1 write a valid machine ID. So, the logic is important only on
soft-reboot. Let's mention that explicitly.
Follow-up for 16718dcf78.
- mention that /run/machine-id is used if exist.
- mention system.machine_id credential,
- credential, VM uuid, and container uuid are not read when --root=
is specified or running in a chroot environment.
This effectively reverts ba540e9f1c.
https://github.com/systemd/systemd/pull/32915#discussion_r1608258136
> In many cases we allow --root=/ as a mechanism for forcing an "offline" mode,
> while still operating on the root dir. if we do the getenv_for_pid() thing
> below I'd claim this is very much an "online" operation, and hence --root=/
> should really disable that.
