Move the renaming function to reboot-util.h (since it writes out
/run/nologin at shutdown), and let's get rid of fileio-label.[ch] now
that it serves no purpose anymore.
Given that we have the LabelOps abstraction these days, we can teach
write_string_file() to use it, which means we can get rid of
fileio-label.[ch] as a separate concept.
(The only reason that fileio-label.[ch] exists independently of
fileio.[ch] was that the former linekd to libselinux potentially, and
thus had to be in src/shared/ while the other always was in src/basic/.
But the LabelOps vtable provides us with a nice work-around)
We have two distinct implementations of the post hook.
1. For SELinux we just reset the selinux label we told the kernel
earlier to use for new inodes.
2. For SMACK we might apply an xattr to the specified file.
The two calls are quite different: the first call we want to call in all
cases (failure or success), the latter only if we actually managed to
create an inode, in which case it is called on the inode.
We noticed some failures because we have code that connects to user
managers by setting DBUS_SESSION_BUS_ADDRESS without setting XDG_RUNTIME_DIR.
If that's the case, connect to the user session bus instead of the
private manager bus as we can't connect to the latter if XDG_RUNTIME_DIR
is not set.
Previously, we were using touch(), which usually works fine, because the
path should always refer to an existing directory, in which case it just
updates the timestamp. However, if the dir does not exist yet (which
shouldn't happen), it would be created as regular file, which is just
wrong.
Hence, let's instead create the dir as dir if it is missing, and then
update its timestamp.
This will allow units (scopes/slices/services) to override the default
systemd-oomd setting DefaultMemoryPressureDurationSec=.
The semantics of ManagedOOMMemoryPressureDurationSec= are:
- If >= 1 second, overrides DefaultMemoryPressureDurationSec= from oomd.conf
- If is empty, uses DefaultMemoryPressureDurationSec= from oomd.conf
- Ignored if ManagedOOMMemoryPressure= is not "kill"
- Disallowed if < 1 second
Note the corresponding dbus property is DefaultMemoryPressureDurationUSec
which is in microseconds. This is consistent with other time-based
dbus properties.
let's rename the "_ts" flavour of these calls "_full" instead, exposing
the full functionality. And then keep two more minimal versions around:
one "_at" (which has the ts parameter suppressed, but keeps the dir_fd
one). And one without suffix (which supresses both).
Do the same for the label versions of these calls.
if a userdb service refuse a user/group name as invalid, let's turn this
into ESRCH client-side following that there definitely is no user/group
record for a completely invalid user/group name.
Replaces: #34558
This is just paranoia, to ensure that we don't accidentally
initiate resume if the initrd is entered through soft-reboot
rather than the initial one for booting up.
By default, in instances where timers are running on a realtime schedule,
if a service takes longer to run than the interval of a timer, the
service will immediately start again when the previous invocation finishes.
This is caused by the fact that the next elapse is calculated based on
the last trigger time, which, combined with the fact that the interval
is shorter than the runtime of the service, causes that elapse to be in
the past, which in turn means the timer will trigger as soon as the
service finishes running.
This behavior can be changed by enabling the new DeferReactivation setting,
which will cause the next calendar elapse to be calculated based on when
the trigger unit enters inactivity, rather than the last trigger time.
Thus, if a timer is on an realtime interval, the trigger will always
adhere to that specified interval.
E.g. if you have a timer that runs on a minutely interval, the setting
guarantees that triggers will happen at *:*:00 times, whereas by default
this may skew depending on how long the service runs.
Co-authored-by: Matteo Croce <teknoraver@meta.com>
Lennart Poettering
Daan De Meyer
Ronan Pigott
Ivan Kruglov
Yu Watanabe
Ryan Wilson
Mike Yuan
Arthur ShauandMatteo Croce
anonymix007