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make virtualization detection quieter, rework unit start limit logic, detect unit file drop-in changes correctly, fix autofs state propagation
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This reverts commit 6d10d308c6cd16528ef58fa4f5822aef936862d3.
It got squashed by mistake.
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Refuse Alias, DefaultInstance, templated units in install (as appropriate)
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that way we can be sure that there's no expiry timeout in place at any time
when we aren't in the RUNNING state.
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Port the progagation logic to the generic Unit->trigger_notify() callback logic
in the unit vtable, that is called for a unit not only when the triggered unit
of it changes state but also when a job for that unit finishes. This, firstly
allows us to make the code a bit cleaner and more generic, but more
importantly, allows us to notice correctly when a mount job fails, and
propagate that back to autofs client processes.
Fixes: #2181
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job for the service queued
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Also, fix indentation.
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And let's make it more accurate: if we have acquire the list of unit drop-ins,
then let's do a full comparison against the old list we already have, and if
things differ in any way, we know we have to reload.
This makes sure we detect changes to drop-in directories in more cases.
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This fixes fall-out from 6d10d308c6cd16528ef58fa4f5822aef936862d3.
Until that commit, do determine whether a daemon reload was required we compare
the mtime of the main unit file we loaded with the mtime of it on disk for
equality, but for drop-ins we only stored the newest mtime of all of them and
then did a "newer-than" comparison. This was brokeni with the above commit,
when all checks where changed to be for equality.
With this change all checks are now done as "newer-than", fixing the drop-in
mtime case. Strictly speaking this will not detect a number of changes that the
code before above commit detected, but given that the mtime is unlikely to go
backwards, and this is just intended to be a helpful hint anyway, this looks OK
in order to keep things simple.
Fixes: #3123
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Let's move the enforcement of the per-unit start limit from unit.c into the
type-specific files again. For unit types that know a concept of "result" codes
this allows us to hook up the start limit condition to it with an explicit
result code. Also, this makes sure that the state checks in clal like
service_start() may be done before the start limit is checked, as the start
limit really should be checked last, right before everything has been verified
to be in order.
The generic start limit logic is left in unit.c, but the invocation of it is
moved into the per-type files, in the various xyz_start() functions, so that
they may place the check at the right location.
Note that this change drops the enforcement entirely from device, slice, target
and scope units, since these unit types generally may not fail activation, or
may only be activated a single time. This is also documented now.
Note that restores the "start-limit-hit" result code that existed before
6bf0f408e4833152197fb38fb10a9989c89f3a59 already in the service code. However,
it's not introduced for all units that have a result code concept.
Fixes #3166.
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This way it can be used in install.c in subsequent commit.
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This way it can be used in install.c in subsequent commit.
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Refuse aliases to non-aliasable units in more places
Fixes #2730.
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If the user defines a symlink alias for a unit whose type does not support
aliasing, detect this early and print a nice warning.
Fixe: #2730
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The concept of merging units exists so that we can create Unit objects for a
number of names early, and then load them only later, possibly merging units
which then turn out to be symlinked to other names. This of course only makes
sense for unit types where multiple names per unit are supported. For all
others, let's refuse the merge operation early.
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We always call one after the other anyway, and this way service_set_socket_fd()
and service_close_socket_fd() nicely match each other as one undoes the effect
of the other.
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Let's make sure when we drop a reference to a unit, that we run the GC queue on
it again.
This (together with the previous commit) should deal with the GC issues pointed
out in:
https://github.com/systemd/systemd/pull/2993#issuecomment-215331189
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There's no need to set the no_gc bit for service units that socket units
prepare, as we always keep a proper reference (as maintained by unit_ref_set())
on them, and such references are honoured by the GC logic anyway. Moreover,
explicitly setting the no_gc bit is problematic if the socket gets GC'ed for a
reason, as the service might then leak with the bit set.
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per-connection service
Fixes: #2993 #2691
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In service_set_socket_fd(), let's make sure that if we can't add the requested
dependencies we take no possession of the passed connection fd.
This way, we follow the strict rule: we take possession of the passed fd on
success, but on failure we don't, and the fd remains in possession of the
caller.
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We generally follow the rule that for time settings we suffix the setting name
with "Sec" to indicate the default unit if none is specified. The only
exception was the rate limiting interval settings. Fix this, and keep the old
names for compatibility.
Do the same for journald's RateLimitInterval= setting
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With #2564 unit start rate limiting was moved from after the condition checks
are to before they are made, in an attempt to fix #2467. This however resulted
in #2684. However, with a previous commit a concept of per socket unit trigger
rate limiting has been added, to fix #2467 more comprehensively, hence the
start limit can be moved after the condition checks again, thus fixing #2684.
Fixes: #2684
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This adds two new settings TriggerLimitIntervalSec= and TriggerLimitBurst= that
define a rate limit for activation of socket units. When the limit is hit, the
socket is is put into a failure mode. This is an alternative fix for #2467,
since the original fix resulted in issue #2684.
In a later commit the StartLimitInterval=/StartLimitBurst= rate limiter will be
changed to be applied after any start conditions checks are made. This way,
there are two separate rate limiters enforced: one at triggering time, before
any jobs are queued with this patch, as well as the start limit that is moved
again to be run immediately before the unit is activated. Condition checks are
done in between the two, and thus no longer affect the start limit.
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This commit improves systemd performance on the systems which have
thousands of units.
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Always create dependencies for bind mounts
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Add the boot parameter: systemd.default_timeout_start_sec to allow modification
of the default start job timeout at boot time.
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The "resources" error is really just the generic error we return when
we hit some kind of error and we have no more appropriate error for the case to
return, for example because of some OS error.
Hence, reword the explanation and don't claim any relation to resource limits.
Admittedly, the "resources" service error is a bit of a misnomer, but I figure
it's kind of API now.
Fixes: #2716
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In case a file is on a networked filesystem, we may tag the fstab record with
_netdev option, however, corrrect dependencies will be created for this mount.
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Dependencies were not created for _netdev mountpoints, the reasoning for this
is in the commit fc676b00, i.e. to avoid adding dependencies for network
mountpoints where What= appears like a path. Thus proposing this semantically
more correct condition when dependencies are added for _actual_ bind mounts
irrespectively of network flag.
Consequently it allows to add _netdev option to bind mounts, which includes
them in remote-fs.target, which simplifies configuration.
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systemd-run: fix --slice= in conjunction with --scope
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Let's be more careful when setting up the Slice= property of transient units:
let's use manager_load_unit_prepare() instead of manager_load_unit(), so that
the load queue isn't dispatched right away, because our own transient unit is
in it, and we don#t want to have it loaded until we finished initializing it.
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This moves the O_TMPFILE handling from the coredumping code into common library
code, and generalizes it as open_tmpfile_linkable() + link_tmpfile(). The
existing open_tmpfile() function (which creates an unlinked temporary file that
cannot be linked into the fs) is renamed to open_tmpfile_unlinkable(), to make
the distinction clear. Thus, code may now choose between:
a) open_tmpfile_linkable() + link_tmpfile()
b) open_tmpfile_unlinkable()
Depending on whether they want a file that may be linked back into the fs later
on or not.
In a later commit we should probably convert fopen_temporary() to make use of
open_tmpfile_linkable().
Followup for: #3065
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Before we invoke now(CLOCK_BOOTTIME), let's make sure we actually have that
clock, since now() will otherwise hit an assert.
Specifically, let's refuse CLOCK_BOOTTIME early in sd-event if the kernel
doesn't actually support it.
This is a follow-up for #3037, and specifically:
https://github.com/systemd/systemd/pull/3037#issuecomment-210199167
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As discussed here:
https://github.com/systemd/systemd/issues/2619#issuecomment-184670042
Explicitly syncing /etc/machine-id after writing it, is probably a good idea,
since it has a strong "commit" character and is generally a one-time thing.
Fixes #2619.
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This adds a new GetProcesses() bus call to the Unit object which returns an
array consisting of all PIDs, their process names, as well as their full cgroup
paths. This is then used by "systemctl status" to show the per-unit process
tree.
This has the benefit that the client-side no longer needs to access the
cgroupfs directly to show the process tree of a unit. Instead, it now uses this
new API, which means it also works if -H or -M are used correctly, as the
information from the specific host is used, and not the one from the local
system.
Fixes: #2945
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Nicer error message is symlinking chokes on an existing file
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Kill user session scope by default
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SELinux outputs semi-random messages like "Unknown permission start for class
system", and the user has to dig into message metadata to find out where
they are comming from. Add a prefix to give a hint.
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This changes the behaviour of pid1 in the following ways:
- obviously $TERM is now checked,
- $SYSTEMD_COLORS is now honoured too, before only SYSTEMD_LOG_COLORS was checked,
- isatty() is run on stdout not stderr.
As requested in #3025.
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Another bunch of improvements to the installation code
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Fixes #2191:
$ systemctl --root=/ enable sddm
Created symlink /etc/systemd/system/display-manager.service, pointing to /usr/lib/systemd/system/sddm.service.
$ sudo build/systemctl --root=/ enable gdm
Failed to enable unit, file /etc/systemd/system/display-manager.service already exists and is a symlink to /usr/lib/systemd/system/sddm.service.
$ sudo build/systemctl --root= enable sddm
$ sudo build/systemctl --root= enable gdm
Failed to enable unit: File /etc/systemd/system/display-manager.service already exists and is a symlink to /usr/lib/systemd/system/sddm.service.
(I tried a few different approaches to pass the error information back to the
caller. Adding a new parameter to hold the error results in a gigantic patch
and a lot of hassle to pass the args arounds. Adding this information to the
changes array is straightforward and can be more easily extended in the
future.)
In case local installation is performed, the full set of errors can be reported
and we do that. When running over dbus, only the first error is reported.
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As suggested in review of #3049.
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(#3037)
It was added in 2.6.39, and causes an assertion to fail when running in mock
hosted on 2.6.32-based RHEL-6:
Assertion 'clock_gettime(map_clock_id(clock_id), &ts) == 0' failed at systemd/src/basic/time-util.c:70, function now(). Aborting.
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