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Allow earlier PAM modules to set `systemd.runtime_max_sec`. If they do,
parse it and set it as the `RuntimeMaxUSec=` property of the session
scope, to limit the maximum lifetime of the session. This could be
useful for time-limiting login sessions, for example.
Signed-off-by: Philip Withnall <withnall@endlessm.com>
Fixes: #12035
Just as `RuntimeMaxSec=` is supported for service units, add support for
it to scope units. This will gracefully kill a scope after the timeout
expires from the moment the scope enters the running state.
This could be used for time-limited login sessions, for example.
Signed-off-by: Philip Withnall <withnall@endlessm.com>
Fixes: #12035
Factor it out into a helper function which is a bit easier to expand in
future. This introduces no functional changes.
Signed-off-by: Philip Withnall <withnall@endlessm.com>
In situations where hibernation is requested but resume= and
resume_offset= kernel parameters are not configured, systemd
will attempt to locate a suitable swap location by inspecting
/proc/swaps. This change will use the first suitable swap with
the highest configured priority.
C's strerror() function does not return a "const char *" pointer
for the string. That has historic reasons and C99 even comments
that "[t]he array pointed to shall not be modified by the program".
Make the strerror_safe() wrapper correct this and be more strict
in this regard.
https://bugzilla.redhat.com/show_bug.cgi?id=1715699
> /dev/mapper/live-rw 6.4G 5.7G 648M 91% /
> systemd-journald[905]: Fixed min_use=1.0M max_use=648.7M max_size=81.0M min_size=512.0K keep_free=973.1M n_max_files=100
When journald is started, we pick keep_free as 15% of the disk size. When the
fs is almost filled, we will only keep one journal file around and rotate very
often (because min_size is very small).
Let's set min use to something reasonable, so that we get more useful logs that
will cover at least the full boot.
Some cases considered in the PR:
> /dev/mapper/live-rw 6.4G 5.7G 648M 91% /
keep_free→MIN(327,100)→100 MB.
min_use→16MB.
effective range: 16 MB – 548 MB
> /dev/mapper/fedora_krowka-root 78G 69G 5.7G 93% /
keep_free → MIN(4GB, 100MB)→100MB
min_use→16MB
effective range: 16 MB – 5.6 GB
(but then there's the max_use limit, which cuts the range down)
> 4TB, 4GB free
keep_free → MIN(209715, 100) → 100 MB
min_use→16MB
effective range: 16 MB – 4.9 GB
(also effectively limited by max_use)
Also replace unneeded width suffixes with spaces, I think this is more
readable, and drop DEFAULT_ prefixes in cases where this setting is
simply a bound, and cannot be overridden by user config, hence is not
a default.
We'd copy /etc/nsswitch.conf, /etc/pam.d/, and /etc/issue (*) on every
tmpfiles --create run. I think we should only do this at boot, so if
people install systemd.rpm in a larger transaction and want to create those
files at a later step, we don't interfere with that.
(Stuff like /etc/os-release and /etc/mtab is not really configurable,
we might as was create it uncondtionally.)
(Seemingly, the alternative approach might be to not call
systemd-tmpfiles --create in systemd.rpm %post. But this wouldn't have much
effect, because various packages call it anyway, and our
%tmpfiles_create_package macro does too. So we need to change the
configuration instead.)
(*) We don't provide /usr/share/factory/issue, so normally this fails, but
somebody else might provide that file, so it seems useful to keep the
C line.
If the symlink is not present, UTC is the default. There *is* a slight
advantage to it: humans might expect it to be present and look in /etc.
But it might interfere with post-install scripts and it doesn't serve
any technical purpose. Let's not create it. Fixes#13183.
