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The new 'unique' API allows listing all unique field values that a field
specified by a field name can take in all entries of the journal. This
allows answering queries such as "What units logged to the journal?",
"What hosts have logged into the journal?", "Which boot IDs have logged
into the journal?".
Ultimately this allows implementation of tools similar to lastlog based
on journal data.
Note that listing these field values will not work for journal files
created with older journald, as the field values are not indexed in
older files.
On systemd systems seasoned admins might be surprised to see that the
init scripts and log files are gone. To ease the transition let's place
some README files there, that hopefully help clearing up the situation.
Much like logind has a client in loginctl, and journald in journalctl
introduce timedatectl, to change the system time (incl. RTC), timezones
and related settings.
If a device unit has aliases defined in udev rules, and there are
other units that depend on that alias, as in
BindTo=sys-subsystem-net-devices-eth0.device
then systemd will fail the start the alias, and any dependent units
will time out. See
https://bugs.freedesktop.org/show_bug.cgi?id=52580
This is because unit_add_name() in device_add_escaped_name() will
return EEXIST.
The solution taken here is to call device_update_unit() on the alias
name. Thus if a unit with the alias name already exists, we reuse it;
otherwise a new unit is created. Creating multiple units for a single
device is perhaps suboptimal, but it's consistent with the treatment
of udev symlinks in device_process_new_device().
Under some circumstances this could lead to a segfault since we we
half-initialized a mount unit, then tried to hook it into the network of
things and while doing that recursively ended up looking at our
half-initialized mount unit again assuming it was fully initialized.
This commit checks for a usage line which contains [{|]reload[|}"] (to
not errnously match force-reload).
Heuristics like this suck, but it solves a real problem and there
appears to be no better way...
Being able to be explicit about Python support (in addition to the
default of auto-detecting it) and acting upon the result, specifying
it as an option gains us more control about both dependencies and
the resulting build.
Furthermore, relying purely on auto-detection can lead to problems for
source-based distros. E. g. systemd being built before *both* 32-bit &
64-bit ABIs are installed will lead to build failures as systemd's
build system will pick up either 32-/64-bit Python, conclude both are
available and fail if that's not the case.
The fstab generator adds Before=swap.target by default, and when creating
a custom .swap unit, you can also add Before=swap.target to the unit.
However, it is impossible to not have this ordering dependency right now.
Virtually all existing setups likely use the fstab generator, so this
change is unlikely to break anything.
Use cases:
* iptables.service – atomically reload rules without having to flush
them beforehand (which may leave the system insecure if reload fails)
* rpc-nfsd.service – reexport filesystems after /etc/exports update
without completely stopping and restarting nfsd
(In both cases, the actual service is provided by a kernel module and
does not have any associated user-space processes, thus Type=oneshot.)
