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When we do mkdir, we should just use 0o777 and let the umask take care of the
rest. Specifying an explicit mode is inappropriate. And when touching the code,
let's replace black madness with normal python style.
To notify user of kill events from systemd-oomd we now use
`SERVICE_FAILURE_OOM_KILL` as the failure result.
`unit_check_oomd_kill` now calls `notify_cgroup_oom` to
update the service result to `oom-kill`.
We add a new xattr `user.oomd_ooms` to keep track of the OOM kills
initiated by systemd-oomd, this helps us resolve a race between sending
SIGKILL to processes and checking for OOM kill status from the xattr.
Related to: #20649
When sorting paths it actually matters to use the right comparison
function. Example:
```
a/x
a-b/y
a_/z
```
I think people would probably expect this:
```
a/x
a-b/y
a_a/z
```
but if you use strcmp() instead of path_compare() you'd instead get:
```
a-b/y
a/x
a_a/z
```
That's because `/` is between `-` and `a` in the ascii table. I think
that's quite confusing, and we shouldn#t order that way hence.
As discussed: https://github.com/systemd/systemd/pull/22662#discussion_r831174776
The actual minimum size of the pool across supported kernel versions is
32 bytes. So adjust this minimum.
I've audited every single usage of random_pool_size(), and cannot see
anywhere that this would have any impact at all on anything. We could
actually just not change the constant and everything would be fine, or
we could change it here and that's fine too. From both a functionality
and crypto perspective, it doesn't really seem to make a substantive
difference any which way, so long as the value is ≥32. However, it's
better to be correct and have the function do what it says, so clamp it
to the right minimum.
systemd-udev-trigger.service by default triggeres all devices regardless
of whether they were already recognized by systemd-udevd.
There are machines (especially in embedded environments) where
systemd-udev-trigger.service is configured to run at a later stage of
the boot sequence, which can lead to quite a lot of devices being
triggered although they were already recognized by systemd-udevd.
Re-triggering a lot of devices is a relatively expensive operation and
therefore should be avoided if unnecessary.
Therefore this patch introduces --initialized-nomatch, which filters out
devices that are already present in the udev database. For consistance
reasons --initialized-match is implemented as well, which filters out devices
that are *not* already present in the udev database.
Replaces #19949.
This addresses the comment by Lennart
https://github.com/systemd/systemd/pull/22662#discussion_r829799863:
> /sys/subsystem is preparation for a future that never came.
> And given that the main proponent of this left Linux kernel
> development (Kay), I doubt this will ever come. So maybe we
> should start dropping references to /sys/subsystem/ given it's
> unlikely to materialize anytime soon.
and devices are sorted when the iteration started.
Previously, devices added by udev_enumerate_add_syspath() ->
device_enumerator_add_device() are not sorted. This fixes the issue.
This new file is supposed to address conflicts with Fedora/Grub's
frankenbootloaderspec implementation, that squatted the /loader/entries/
dir, but place incompatible files in them (that do variable expansion?).
A simple text file /loader/entries.srel shall indicate which spec is
implemented. If it contains the string "type1\n" then the
/loader/entries/ directory implements our standard spec, otherwise
something else.
So, typically systemd-boot is referenced as sd-boot, due to te usual
shorter naming in ESP resources. systemd-stub didnt do that so far,
since it never appears as separate files in the ESP. However it's super
annoying that you can find "man sd-boot", but not the very closely
related "man sd-stub". Let's fix that, and also add an "sd-stub" alias
to the "systemd-stub" man page.
So (maybe weirdly) loader.conf(5) documents both loader.conf and type #1
entries (because they share a similar syntax). But it then only lists
the options of loader.conf. Let's add an explicit hint where to find
the documentation of the type #1 entries.
The old text was simply wrong, we used to read $layout from
/etc/kernel/install.conf and the machine ID from
$KERNEL_INSTALL_MACHINE_ID from /etc/machine-info. Correct that.
Apparently KERNEL_INSTALL_MACHINE_ID was already known back in v235
times, hence don't mention it anymore.
it's kinda weird retro-fixing these NEWS entries, given we deprecate
them again, but I couldn't let this really incorrect stuff be.
bootctl so far tried to determine the layout from /etc/machine-info, but
that's obsolete, and the kernel-install script never looked there. Let's
read the setting from /etc/kernel/install.conf instead, where
kernel-install actually looks.
Support for reading the field from /etc/machine-info is retained for
compat.
This means we'll now read /etc/machine-id, /etc/machine-info and
/etc/kernel/install.conf, and read the machine ID from the former too
and the layout setting from the latter two.
We shouldn't auto-disable event sources we create in "floating" mode.
Hence don#t use the disabling destructor for event sources.
Given that noone else has access to this event source we just allocated
anyway there's no point in explicitly disabling it before freeing it.
Follow-up for ec75e8e07a
Check if process(es) of a cgroup were killed by Kernel OOM killer
or systemd-oomd before we send the cgroup empty notification.
This allows us to show the right exit state(ServiceResult)
We so far had some magic logic in place that files we open for write
with size zero are freshly created. That of course is a bogus
assumption, in particular as this code deals with corrupted file systems
which oftentimes contain zero size inodes from left-over runs.
Let's fix this properly, and actually let the kernel tell us whether it
create the file or not.
This is a wrapper around openat(). It works mostly the same, except for
one thing: it race-freely reports whether we just created the indicated
file in case O_CREAT is passed without O_EXCL.
