We don't have plural in the name of any other -util files and this
inconsistency trips me up every time I try to type this file name
from memory. "formats-util" is even hard to pronounce.
For similar reasons as the recent addition of a limit on sessions.
Note that we don't enforce a limit on inhibitors per-user currently, but
there's an implicit one, since each inhibitor takes up one fd, and fds are
limited via RLIMIT_NOFILE, and the limit on the number of processes per user.
We really should put limits on all resources we manage, hence add one to the
number of concurrent sessions, too. This was previously unbounded, hence set a
relatively high limit of 8K by default.
Note that most PAM setups will actually invoke pam_systemd prefixed with "-",
so that the return code of pam_systemd is ignored, and the login attempt
succeeds anyway. On systems like this the session will be created but is not
tracked by systemd.
We enable lingering for anyone who wants this. It is still disabled by
default to avoid keeping long-running processes accidentally.
Admins might want to customize this policy on multi-user sites.
systemd-logind uses mkdir_label and label_fix functions without calling
first mac_selinux_init. This makes /run/user/$UID/ directories not
labelled correctly on an Arch Linux system using SELinux.
Fix this by calling mac_selinux_init("/run") early in systemd-logind.
This makes files created in /etc/udev/rules.d and /var/lib/systemd to be
labelled through transitions in the SELinux policy instead of using
setfscreatecon (with mac_selinux_create_file_prepare).
manager_{start,stop}_{slice,scope,unit} functions had an optional job
output parameter. But all callers specified job, so make the parameter
mandatory, add asserts. Also extract common job variable handling to
a helper function to avoid duplication.
Avoids gcc warning about job being unitialized.
gcc is confused by the common idiom of
return errno ? -errno : -ESOMETHING
and thinks a positive value may be returned. Replace this condition
with errno > 0 to help gcc and avoid many spurious warnings. I filed
a gcc rfe a long time ago, but it hard to say if it will ever be
implemented [1].
Both conventions were used in the codebase, this change makes things
more consistent. This is a follow up to bcb161b023.
[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61846
method_schedule_shutdown referenced org.freedesktop.login1.poweroff*
which is never registered in polkit.
Now refers to org.freedesktop.login1.power-off*
Signed-off-by: Joost Bremmer <toost.b@gmail.com>
GLIB has recently started to officially support the gcc cleanup
attribute in its public API, hence let's do the same for our APIs.
With this patch we'll define an xyz_unrefp() call for each public
xyz_unref() call, to make it easy to use inside a
__attribute__((cleanup())) expression. Then, all code is ported over to
make use of this.
The new calls are also documented in the man pages, with examples how to
use them (well, I only added docs where the _unref() call itself already
had docs, and the examples, only cover sd_bus_unrefp() and
sd_event_unrefp()).
This also renames sd_lldp_free() to sd_lldp_unref(), since that's how we
tend to call our destructors these days.
Note that this defines no public macro that wraps gcc's attribute and
makes it easier to use. While I think it's our duty in the library to
make our stuff easy to use, I figure it's not our duty to make gcc's own
features easy to use on its own. Most likely, client code which wants to
make use of this should define its own:
#define _cleanup_(function) __attribute__((cleanup(function)))
Or similar, to make the gcc feature easier to use.
Making this logic public has the benefit that we can remove three header
files whose only purpose was to define these functions internally.
See #2008.
If we requeue jobs, we are no longer interested in old jobs. Hence, we
better ignore any JobRemoved signals for old jobs and concentrate on our
replacements.
When queuing unit jobs, we should rather replace existing units than
fail. This is especially important when we queued a user-shutdown and a
new login is encountered. In this case, we better raplce the shutdown
jobs. systemd takes care of everything else.
This new setting configures the TasksMax= field for the slice objects we
create for each user.
This alters logind to create the slice unit as transient unit explicitly
instead of relying on implicit generation of slice units by simply
starting them. This also enables us to set a friendly description for
slice units that way.
The files are named too generically, so that they might conflict with
the upstream project headers. Hence, let's add a "-util" suffix, to
clarify that this are just our utility headers and not any official
upstream headers.
So far we had two pretty much identical calls in user-util.[ch]:
lookup_uid() and uid_to_name(). Get rid of the former, in favour of the
latter, and while we are at it, rewrite it, to use getpwuid_r()
correctly, inside an allocation loop, as POSIX intended.
When the Suspend method is called, the only log message we write
(unless debugging is enabled) is "Operation finished.". This is
not very helpful when trying to figure out what is going on, so
add what operation we are talking about to the message:
"Operation 'sleep' finished.".
Hat tip to Daniel Aleksandersen for pointing this out.
systemd-logind[27]: System is rebooting. (Applied kernel updates.)
is changed to
systemd-logind[27]: System is rebooting (Applied kernel updates).
Users should not add a dot in the sentence in --message, i.e. the correct usage is now:
$ systemctl reboot --message "Applied kernel updates"
Allow passing a "dry-" prefix to the action parameter passed to
.ScheduleShutdown(). When strings with this prefix are passed,
the scheduled action will not take place. Instead, an info message
is logged.
Extra details for an action can be supplied when calling polkit's
CheckAuthorization method. Details are a list of key/value string pairs.
Custom policy can use these details when making authorization decisions.
We treat an empty wall-message equal to a NULL wall-message since:
commit 5744f59a3e
Author: Lennart Poettering <lennart@poettering.net>
Date: Fri Sep 4 10:34:47 2015 +0200
logind: treat an empty wall message like a NULL one
Fix the shutdown scheduler to not deref a NULL pointer, but properly
check for an empty wall-message.
Fixes: #1120
Enable unprivileged users to set wall message on a shutdown
operation. When the message is set via the --message option,
it is logged together with the default shutdown message.
$ systemctl reboot --message "Applied kernel updates."
$ journalctl -b -1
...
systemd-logind[27]: System is rebooting. (Applied kernel updates.)
...
Use mfree() where we can.
Drop unnecessary {}.
Drop unnecessary variable declarations.
Cast syscall invocations where explicitly don't care for the return
value to (void).
Reword a comment.
If we get a weird signal, then we should log about it, but not return an
error, since sd-bus will not call us again then anymore, but for these
signals we match here we actually do want to be called on the next
invocation.
Let logind use the sd_bus_track helper object to track the controllers of
sessions. This does not only remove quite some code but also kills the
unconditional matches for all NameOwnerChanged signals.
The latter is something we should never ever do, as it wakes up the daemon
every time a client connects, which doesn't scale.
Some places invoked fflush() directly with their own manual error
checking, let's unify all that by using fflush_and_check().
This also unifies the general error paths of fflush()+rename() file
writers.
WRITE_STRING_FILE_ATOMIC is only valid if WRITE_STRING_FILE_CREATE is also
given. IOW, an atomic file write operation is only possible when creating a
file is also being asked for.
This is a regression from the recent write_string_file() rework.
A while back we opened up all of logind's bus calls to unprivileged
users, via PK. However, the dbus1 policy wasn't updated accordingly.
With this change, the dbus1 policy is opened up for all bus calls that
should be available to unprivileged clients.
(also rearranges some calls in the vtable, to make more sense, and be in
line with the order in the bus policy file)
Fixes#471.
Make sure a greeter can forcefully spawn a session on a VT that is
in-use. A recent patch prevented this (this used to be possible for all
session types) as it is highly fragile. However, as it turns out,
greeters seem to rely on that feature. Therefore, make sure we allow it
explicitly for greeters.
Right now, if you're already in a session and call CreateSession, we
return information about the current session of yours. This is highy
confusing and a nasty hack. Avoid that, and instead return a commonly
known error, so the caller can detect that.
This has the side-effect, that we no longer override XDG_VTNR and XDG_SEAT
in pam_systemd, if you're already in a session. But this sounds like the
right thing to do, anyway.
Old gdm and lightdm start the user-session during login before they
destroy the greeter-session. Therefore, the user-session will take over
the VT from the greeter. We recently prevented this by never allowing
multiple sessions on the same VT. Fix this now, by explicitly allowing
this if the owning session is a GREETER.
Note that gdm no longer behaves like this. Instead, due to wayland, they
always use a different VT for each session. All other login-managers are
highly encouraged to destroy the greeter-session _before_ starting the
user-session. We now work around this, but this will probably not last
forever (and will already have nasty side-effects on the greeter-session).
Merge write_string_file(), write_string_file_no_create() and
write_string_file_atomic() into write_string_file() and provide a flags mask
that allows combinations of atomic writing, newline appending and automatic
file creation. Change all users accordingly.
Reverend Homer