We do that in all other cases, let's do it here too. Since
SD_EVENT_PRIORITY_NORMAL evaluates to zero there's zero effective
difference, but it makes things easier to grok and grep for if we always
express relative priorities within PID 1 only.
Let's shorten manager_check_finished() a bit by splitting out checking
of basic.target and the two things we do when we reach it.
This should not change behaviour, except for one thing: we now check
basic.target's actual state for figuring out whether it is up, instead
of generically checking whether it has any job queued. This is arguably
more correct, and is what other code does too for similar purposes, for
example manager_state()
The DHCPv6 client will set its state to DHCP6_STATE_STOPPED if
an error occurs or when receiving an Information Reply DHCPv6
message. Once in DHCP6_STATE_STOPPED, the DHCPv6 client needs
to be restarted by calling sd_dhcp6_client_start().
As of pull request #7796 client_reset() no longer closes the
network socket, thus a call to sd_dhcp6_client_start() needs to
check whether the file descriptor already exists in order not to
create a new one. Likewise, a call to sd_dhcp6_client_unref()
must now close the network socket as client_reset() is not
closing it.
Reported by asavah and Yu Watanabe.
So far, we considered mount units activated as soon as the mount
appeared. This avoided seeing a difference between mounts started by
systemd, and e.g. by running `mount` from a terminal.
(`umount` was not handled this way).
However in some cases, options passed to `mount` require additional
system calls after the mount is successfully created. E.g. the
`private` mount option, or the `ro` option on bind mounts.
It seems best to wait for mount to finish doing that. E.g. in
the `private` case, the current behaviour could theoretically cause
non-deterministic results, as child mounts inherit the
private/shared propagation setting from their parent.
This also avoids a special case in mount_reload().
It _looks_ as if, back when we used to retry unsuccessful calls to umount,
this would have inflated the effective timeout. Multiplying it by
RETRY_UMOUNT_MAX. Which is set to 32.
I'm surprised if it's true: I would have expected it to be noticed during
the work on NFS timeouts. But I can't see what would have stopped it.
Clarify that I do not expect this to happen anymore. I think each
individual umount call is allowed up to the full timeout, but if umount
ever exited with a signal status, we would stop retrying.
To be extra clear, make sure that we do not retry in the event that umount
perversely returned EXIT_SUCCESS after receiving SIGTERM.
"Due to the io event priority logic we can be sure the new mountinfo is
loaded before we process the SIGCHLD for the mount command."
I think this is a reasonable expectation. But if it works, then the
other comment must be false:
"Note that mount(8) returning and the kernel sending us a mount table
change event might happen out-of-order."
Therefore we can clean up the code for the latter.
If this is working as advertised, then we can make sure that mount units
fail if the mount we thought we were creating did not actually appear,
due to races or trickery (or because /sbin/mount did something unexpected
despite returning EXIT_SUCCESS).
Include a specific warning message for this failure.
If we give up when the mount point is still mounted after 32 successful
calls to /sbin/umount, that seems a fairly similar case. So make that
message a LOG_WARN as well (not LOG_DEBUG). Also, this was recently changed to only
retry while umount is returning EXIT_SUCCESS; in that case in particular
there would be no other messages in the log to suggest what had happened.
DNS queries have a timeout of DNS_TRANSACTION_ATTEMPTS_MAX *
DNS_TIMEOUT_MAX_USEC = 120 s. Calls to the ResolveHostname method of
the org.freedesktop.resolve1.Manager interface have various call
timeouts that are smaller than 120 s. So it seems correct to adjust
the call timeout to the maximum query timeout and to unify the call
timeout among all callers.
A timeout of 120 s might seem large, in particular since BIND does seem
to have a query timeout of 10 s. However, it seems match the timeout
value of 120 s of Unbound. Moreover, the query and timeout handling of
resolve have problems and might be improved in the future, so this
change is at best an interim solution.
udev-made .device aliases are not normal alias
They are full-fledged units which are linked to
the same sysfs path
we need to explicitely propagate reload to all
alias
New debug verb that enables or disables the service runtime watchdogs
and emergency actions during runtime. This is the systemd-analyze
version of the systemd.service_watchdogs command line option.
Incorporating the fix from d00f1d57 into other output formats of journalctl.
If journal files are corrupted, e.g. not cleanly closed, some journal
entries can not be read by output options other than 'short' (default).
If such entries has been identified, they will now just be skipped.
When a unit job finishes early (e.g. when fork(2) fails) triggered unit goes
through states
stopped->failed (or failed->failed),
in case a ExecStart= command fails unit passes through
stopped->starting->failed.
The former transition doesn't result in unit active/inactive timestamp being
updated and timer (OnUnitActiveSec= or OnUnitInactiveSec=) would use an expired
timestamp triggering immediately again (repeatedly).
This patch exploits timer's last trigger timestamp to ensure the timer isn't
triggered more frequently than OnUnitActiveSec=/OnUnitInactiveSec= period.
Steps to reproduce:
0) Create sample units:
cat >~/.config/systemd/user/looper.service <<EOD
[Service]
ExecStart=/usr/bin/sleep 2
EOD
cat >~/.config/systemd/user/looper.timer <<EOD
[Timer]
AccuracySec=5
OnUnitActiveSec=5
EOD
1) systemctl --user daemon-reload
2) systemctl --user start looper.timer
# to have first activation timestamp/sentinel
systemctl --user start looper.service
o Observe the service is being regularly triggered.
3) systemctl set-property user@$UID.service TasksMax=2
o Observe the tight looping as long as the looper.service cannot be started.
Ref: #5969
canonicalize_file_name() invocations were replaced by chase_symlinks() in
Decemeber 2016 with PR #4694, so we don't need this mention in the TODO anymore
The DHCPv6 client can obtain configuration parameters from a
DHCPv6 server through a rapid two-message exchange solicit and reply).
When the rapid commit option is enabled by both the DHCPv6 client and
the DHCPv6 server, the two-message exchange is used, rather than the default
four-method exchange (solicit, advertise, request, and reply). The two-message
exchange provides faster client configuration and is beneficial in environments
in which networks are under a heavy load.
Closes#5845
This happens to be almost the same moment as when we send READY=1 in the user
instance, but the logic is slightly different, since we log taint when
basic.target is reached in the system manager, but we send the notification
only in the user manager. So add a separate flag for this and propagate it
across reloads.
Fixes#7683.
The commit f14f1806e3 introduced CHASE_SAFE
flag. When the flag is set, then `fd_parent` may not be properly closed.
This sets `_cleanup_close_` attribute to `fd_parent`.
Thus, now `fd_parent` is always closed properly.
It was forbidden to create mount units for a symlink. But the reason is
that the mount unit needs to know the real path that will appear in
/proc/self/mountinfo. The kernel dereferences *all* the symlinks in the
path at mount time (I checked this with `mount -c` running under `strace`).
This will have no effect on most systems. As recommended by docs, most
systems use /etc/fstab, as opposed to native mount unit files.
fstab-generator dereferences symlinks for backwards compatibility.
A relatively minor issue regarding Time Of Check / Time Of Use also exists
here. I can't see how to get rid of it entirely. If we pass an absolute
path to mount, the racing process can replace it with a symlink. If we
chdir() to the mount point and pass ".", the racing process can move the
directory. The latter might potentially be nicer, except that it breaks
WorkingDirectory=.
I'm not saying the race is relevant to security - I just want to consider
how bad the effect is. Currently, it can make the mount unit active (and
hence the job return success), despite there never being a matching entry
in /proc/self/mountinfo. This wart will be removed in the next commit;
i.e. it will make the mount unit fail instead.
