Let's extend nss-systemd to also synthesize user/group entries for the
UIDs/GIDs 0 and 65534 which have special kernel meaning. Given that nss-systemd
is listed in /etc/nsswitch.conf only very late any explicit listing in
/etc/passwd or /etc/group takes precedence.
This functionality is useful in minimal container-like setups that lack
/etc/passwd files (or only have incompletely populated ones).
This should simplify monitoring tools for services, by passing the most basic
information about service result/exit information via environment variables,
thus making it unnecessary to retrieve them explicitly via the bus.
The ExecParameters structure contains a number of bit-flags, that were so far
exposed as bool:1, change this to a proper, single binary bit flag field. This
makes things a bit more expressive, and is helpful as we add more flags, since
these booleans are passed around in various callers, for example
service_spawn(), whose signature can be made much shorter now.
Not all bit booleans from ExecParameters are moved into the flags field for
now, but this can be added later.
Beef up the existing var_tmp() call, rename it to var_tmp_dir() and add a
matching tmp_dir() call (the former looks for the place for /var/tmp, the
latter for /tmp).
Both calls check $TMPDIR, $TEMP, $TMP, following the algorithm Python3 uses.
All dirs are validated before use. secure_getenv() is used in order to limite
exposure in suid binaries.
This also ports a couple of users over to these new APIs.
The var_tmp() return parameter is changed from an allocated buffer the caller
will own to a const string either pointing into environ[], or into a static
const buffer. Given that environ[] is mostly considered constant (and this is
exposed in the very well-known getenv() call), this should be OK behaviour and
allows us to avoid memory allocations in most cases.
Note that $TMPDIR and friends override both /var/tmp and /tmp usage if set.
This new output mode formats all timestamps using the usual format_timestamp()
call we use pretty much everywhere else. Timestamps formatted this way are some
ways more useful than traditional syslog timestamps as they include weekday,
month and timezone information, while not being much longer. They are also not
locale-dependent. The primary advantage however is that they may be passed
directly to journalctl's --since= and --until= switches as soon as #3869 is
merged.
While we are at it, let's also add "short-unix" to shell completion.
This patch improves parsing and generation of timestamps and calendar
specifications in two ways:
- The week day is now always printed in the abbreviated English form, instead
of the locale's setting. This makes sure we can always parse the week day
again, even if the locale is changed. Given that we don't follow locale
settings for printing timestamps in any other way either (for example, we
always use 24h syntax in order to make uniform parsing possible), it only
makes sense to also stick to a generic, non-localized form for the timestamp,
too.
- When parsing a timestamp, the local timezone (in its DST or non-DST name)
may be specified, in addition to "UTC". Other timezones are still not
supported however (not because we wouldn't want to, but mostly because libc
offers no nice API for that). In itself this brings no new features, however
it ensures that any locally formatted timestamp's timezone is also parsable
again.
These two changes ensure that the output of format_timestamp() may always be
passed to parse_timestamp() and results in the original input. The related
flavours for usec/UTC also work accordingly. Calendar specifications are
extended in a similar way.
The man page is updated accordingly, in particular this removes the claim that
timestamps systemd prints wouldn't be parsable by systemd. They are now.
The man page previously showed invalid timestamps as examples. This has been
removed, as the man page shouldn't be a unit test, where such negative examples
would be useful. The man page also no longer mentions the names of internal
functions, such as format_timestamp_us() or UNIX error codes such as EINVAL.
Otherwise for example services that are failing on start and have Restart=on-failure
and bigger RestartSec systemctl status will return 0.
Fixes: #3864
This way, invoking nspawn from a shell in the best case inherits the TERM
setting all the way down into the login shell spawned in the container.
Fixes: #3697
This removes the --share-system switch: from the documentation, the --help text
as well as the command line parsing. It's an ugly option, given that it kinda
contradicts the whole concept of PID namespaces that nspawn implements. Since
it's barely ever used, let's just deprecate it and remove it from the options.
It might be useful as a debugging option, hence the functionality is kept
around for now, exposed via an undocumented $SYSTEMD_NSPAWN_SHARE_SYSTEM
environment variable.
This has the benefit that the container can follow the host's DNS server
changes without us having to constantly update the container's resolv.conf
settings.
Whether a device is a trackball or not is a physical property so we should
store this globally, in one place. The new property must be set in addition to
ID_INPUT_MOUSE, otherwise existing clients won't detect the device.
No actual code changes required, the default match rule is simply checking for
"Trackball" in the name (in a few versions), other entries need to be added
manually.
Process container parent is the process used to start processes with a new
user namespace - e.g systemd-nspawn, runc, lxc, etc.
There is not standard way how to find such a process - or I do not know
about it - hence I have decided to find the first process in the parent
process hierarchy with a different mount namespace and different
/proc/self/root's inode.
I have decided for this criteria because in ABRT we take special care
only if the crashed process runs different code than installed on the
host. Other processes with namespaces different than PID 1's namespaces
are just processes running code shipped by the OS vendor and bug
reporting tools can get information about the provider of the code
without the need to deal with changed root and so on.
IMA wiki says: "If the IMA policy contains LSM labels, then the LSM
policy must be loaded prior to the IMA policy." Right now, in case of
Smack, the IMA policy is loaded before the Smack policy. Move the order
around to allow Smack labels to be used in IMA policy.
This complements graphical-session.target for services which set up the
environment (e. g. dbus-update-activation-environment) and need to run before
the actual graphical session.
For this moment machinectl prints legend and count of machines/images/etc.
But in a case when we have no images,machines,etc., there is no sense to
show legend:
~$ machinectl
MACHINE CLASS SERVICE
0 machines listed.
Let's print only 'No machines', 'No images', 'No transfers' in this case.
the ACTION_DONE was introduced in the 4288f61921 (dbus: automatically
generate and install introspection files ) commit and was used in
systemd --introspect command.
Later 'introspect' command was removed in the ca2871d9b (bus: remove
static introspection file export) commit and have no users anymore.
So we can remove it.
They were outdated, and this way it's less likely that they'll get out of sync
again. Anyway, it's easier for the reader to have the kernel and config file
options next to one another.
Depending on how binutils was configured and the --enable-fast-install
configure option, the test binary might be called either name.
Fixes: https://github.com/systemd/systemd/issues/3838
config_parse_user_tasks_max() was incorrectly accepting percentage value
between 1 and 99. Update it to accept 0% and 100%. This brings it in line
with TasksMax handling in systemd.
