nspawn: optionally run a stub init process as PID 1
This adds a new switch --as-pid2, which allows running commands as PID 2, while a stub init process is run as PID 1.
This is useful in order to run arbitrary commands in a container, as PID1's semantics are different from all other
processes regarding reaping of unknown children or signal handling.
For use in timesyncd we already defined a compile-time "epoch" value, which is based on the mtime of the NEWS file, and
specifies a point in time we know lies in the past at runtime. timesyncd uses this to filter out nonsensical timestamp
file data, and bump the system clock to a time that is after the build time of systemd. This patch adds similar bumping
code to earliest PID 1 initialization, so that the system never continues operation with a clock that is in the 1970ies
or even 1930s.
Nicolas Iooss [Tue, 2 Feb 2016 19:07:46 +0000 (20:07 +0100)]
logind: load SELinux labelling system
systemd-logind uses mkdir_label and label_fix functions without calling
first mac_selinux_init. This makes /run/user/$UID/ directories not
labelled correctly on an Arch Linux system using SELinux.
Fix this by calling mac_selinux_init("/run") early in systemd-logind.
This makes files created in /etc/udev/rules.d and /var/lib/systemd to be
labelled through transitions in the SELinux policy instead of using
setfscreatecon (with mac_selinux_create_file_prepare).
The mount_setup_early() and mount_setup() contain almost the same
pieces of code which calls mount_one() for a certain mount point
from the mount_table. This patch introduces mount_points_setup()
helper to prevent code duplication.
Michal Sekletar [Mon, 1 Feb 2016 09:44:58 +0000 (10:44 +0100)]
journalctl: make "journalctl /dev/sda" work
Currently when journalctl is called with path to block device node we
add following match _KERNEL_DEVICE=b$MAJOR:$MINOR.
That is not sufficient to actually obtain logs about the disk because
dev_printk() kernel helper puts to /dev/kmsg information about the
device in following format, +$SUBSYSTEM:$ADDRESS,
e.g. "+pci:pci:0000:00:14.0".
Now we will walk upward the syspath and add match for every device in
format produced by dev_printk() as well as match for its device node if
it exists.
The server might answer to a DHCPREQUEST with a NAK and currently the
client restarts the configuration process immediately. It was
observed that this can easily generate loops in which the network is
flooded with DISCOVER,OFFER,REQUEST,NAK sequences.
RFC 2131 only states that "if the client receives a DHCPNAK message,
the client restarts the configuration process" without further
details.
Add a delay with exponential backoff between retries after NAKs to
limit the number of requests and cap the delay to 30 minutes.
core: rework unit timeout handling, and add new setting RuntimeMaxSec=
This clean-ups timeout handling in PID 1. Specifically, instead of storing 0 in internal timeout variables as
indication for a disabled timeout, use USEC_INFINITY which is in-line with how we do this in the rest of our code
(following the logic that 0 means "no", and USEC_INFINITY means "never").
This also replace all usec_t additions with invocations to usec_add(), so that USEC_INFINITY is properly propagated,
and sd-event considers it has indication for turning off the event source.
This also alters the deserialization of the units to restart timeouts from the time they were originally started from.
Before this patch timeouts would be restarted beginning with the time of the deserialization, which could lead to
artificially prolonged timeouts if a daemon reload took place.
Finally, a new RuntimeMaxSec= setting is introduced for service units, that specifies a maximum runtime after which a
specific service is forcibly terminated. This is useful to put time limits on time-intensive processing jobs.
This also simplifies the various xyz_spawn() calls of the various types in that explicit distruction of the timers is
removed, as that is done anyway by the state change handlers, and a state change is always done when the xyz_spawn()
calls fail.
core: fix support for transient resource limit properties
Make sure we can properly process resource limit properties. Specifically, allow transient configuration of both the
soft and hard limit, the same way from the unit files. Previously, only the the hard rlimits could be configured but
they'd implicitly spill into the soft hard rlimits.
This also updates the client-side code to be able to parse hard/soft resource limit specifications. Since we need to
serialize two properties in bus_append_unit_property_assignment() now, the marshalling of the container around it is
now moved into the function itself. This has the benefit of shortening the calling code.
As a side effect this now beefs up the rlimit parser of "systemctl set-property" to understand time and disk sizes
where that's appropriate.
clang is apparently not smart enough to detect when a switch statement contains case statements for all possible values
of the used type. Work around that.
(And while we are at it, normalize indentation a bit)
core: fix handling of AccuracyUSec and RandomDelayUSec bus properties
Clear up some confusion regarding the USec and Sec suffixes we use. In configuration files we usually use the Sec
suffix, to indicate the implied time unit if none is specified. The respective bus properties however use the USec
property, since they expose 64bit unsigned integers containing time in µs.
Before this patch timer units exposed a bus property AccuracyUSec (which hence is the correct name) but when parsing
transient property data would look for AccuracySec instead (which is incorrect). This patch ensures we look for
AccuracySec correctly, but keeps the code for AccuracyUSec in place for compatibility, but adds a warning to ensure
that apps are updated to use the right property.
core: store for each unit when the last low-level unit state change took place
This adds a new timestamp field to the Unit struct, storing when the last low-level state change took place, and make
sure this is restored after a daemon reload. This new field is useful to allow restarting of per-state timers exactly
where they originally started.
sd-event: permit a USEC_INFINITY timeout as an alternative to a disabling an event source
This should simplify handling of time events in clients and is in-line with the USEC_INFINITY macro we already have.
This way setting a timeout to 0 indicates "elapse immediately", and a timeout of USEC_INFINITY "elapse never".
resolved: rework what ResolveHostname() with family == AF_UNSPEC means
Previously, if a hostanem is resolved with AF_UNSPEC specified, this would be used as indication to resolve both an
AF_INET and an AF_INET6 address. With this change this logic is altered: an AF_INET address is only resolved if there's
actually a routable IPv4 address on the specific interface, and similar an AF_INET6 address is only resolved if there's
a routable IPv6 address. With this in place, it's ensured that the returned data is actually connectable by
applications. This logic mimics glibc's resolver behaviour.
Note that if the client asks explicitly for AF_INET or AF_INET6 it will get what it asked for.
This also simplifies the logic how it is determined whether a specific lookup shall take place on a scope.
Specifically, the checks with dns_scope_good_key() are now moved out of the transaction code and into the query code,
so that we don't even create a transaction object on a specific scope if we cannot execute the resolution on it anyway.
Jan Synacek [Mon, 1 Feb 2016 08:23:58 +0000 (09:23 +0100)]
sd-journal: introduce has_runtime_files and has_persistent_files
Also introduce sd_journal_has_runtime_files() and
sd_journal_has_persistent_files() to the public API. These functions
can be used to easily find out if the open journal files are runtime
and/or persistent.
-bash-4.3# sesearch --allow -s systemd_test_reload_t -c service
Found 1 semantic av rules:
allow systemd_test_reload_t systemd_unit_file_t : service reload ;
-bash-4.3# runcon -t systemd_test_reload_t systemctl reload hola
Failed to reload hola.service: Access denied
See system logs and 'systemctl status hola.service' for details.
I'm not defining _DNS_SERVER_TYPE_MAX/INVALID as usual in the enum,
because it wouldn't be used, and then gcc would complain that
various enums don't test for _DNS_SERVER_TYPE_MAX. It seems better
to define the macro rather than add assert_not_reached() in multiple
places.
udev: net_id - for ccw bus, shorten the identifier and stip leading zeros
The commmon case default qeth link is enccw0.0.0600 is rather long.
Thus strip leading zeros (which doesn't make the bus_id unstable),
similar to the PCI domain case.
Also 'ccw' is redundant on S/390, as there aren't really other buses
available which could have qeth driver interfaces. Not sure why this
code is even compiled on non-s390[x] platforms. But to distinguish from
e.g. MAC stable names shorten the suffix to just 'c'.
projects / thirdparty / systemd.git / log
