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After all it is now much more like strjoin() than strappend(). At the
same time, add support for NULL sentinels, even if they are normally not
necessary.
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Add unit dependencies for dynamic (i. e. not from fstab) mounts. With that,
mount units properly bind to their underlying device, and thus get
automatically stopped/unmounted when the underlying device goes away.
This cleans up stale mounts from unplugged devices.
Thanks to Lennart Poettering for pointing out the fix!
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changing unit state
Unit _start() and _stop() implementations can fail with -EAGAIN to delay
execution temporarily. Thus, we should not output status messages before
invoking these calls, but after, and only when we know that the
invocation actually made a change.
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/dev when shutting down
After all, mounts below these directories are pretty much guaranteed to
be virtual, and it's hence unnecessary to unmount them during shutdown.
Moreover, in less-priviliged containers we might lack the rights to
unmount them, hence don't even try.
http://lists.freedesktop.org/archives/systemd-devel/2015-January/027113.html
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deb6120920 'man: there's actually no "fail" fstab option, but only
"nofail" removed it from our documentation, which I missed.
fstab(5) only mentions "auto", "noauto", and "nofail". Stick to
those three.
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strempty() will return an empty string in case the input parameter is
a NULL pointer. The correct test to check for an empty string is
isempty(), so use that instead.
This fixes a regression from commit 17a1c59 ("core/mount: filter out
noauto,auto,nofail,fail options").
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We passed the full option string from fstab to /bin/mount. It would in
turn pass the full option string to its helper, if it needed to invoke
one. Some helpers would ignore things like "nofail", but others would
be confused. We could try to get all helpers to ignore those
"meta-options", but it seems better to simply filter them out.
In our model, /bin/mount simply has no business in knowing whether the
mount was configured as fail or nofail, auto or noauto, in the
fstab. If systemd tells invokes a command to mount something, and it
fails, it should always return an error. It seems cleaner to filter
out the option, since then there's no doubt how the command should
behave.
https://bugzilla.redhat.com/show_bug.cgi?id=1177823
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This fixes parsing of options in shared/generator.c. Existing code
had some issues:
- it would treate whitespace and semicolons as seperators. fstab(5)
is pretty clear that only commas matter. And the syntax does
not allow for spaces to be inserted in the field in fstab.
Whitespace might be escaped, but then it should not seperate
options. Treat whitespace and semicolons as any other character.
- it assumed that x-systemd.device-timeout would always be followed
by "=". But this is not guaranteed, hasmntopt will return this
option even if there's no value. Uninitialized memory could be read.
- some error paths would log, and inconsistently, some would just
return an error code.
Filtering is split out to a separate function and tests are added.
Similar code paths in other places are adjusted to use the new function.
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-n is only allowed for root. /etc/mtab is nowadays almost always a link to /proc/,
so in practice this does not really matter too much, but should allow .mount units
to work in --user mode.
https://bugs.freedesktop.org/show_bug.cgi?id=87602
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There is alot of cleanup that will have to happen to turn on
-fstrict-aliasing, but I think our code should be "correct" to the rule.
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Containers do not really support .device, .automount or .swap units;
Systems compiled without support for swap do not support .swap units;
Systems without kdbus do not support .busname units.
With this change attempts to start a unsupported unit types will result
in an immediate "unsupported" job result, which is a lot more
descriptive then before. Also, attempts to start device units in
containers will now immediately fail instead of causing jobs to be
enqueued that never go away.
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src/libsystemd/sd-bus/bus-common-errors.h
Stuff in src/shared/ should not use stuff from src/libsystemd/ really.
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native API for this in libmount, as soon as that's stable
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Let's add some syntactic sugar for iterating through inotify events, and
use it everywhere.
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Overflow is very unlikely, since we are watching a privileged directory,
but could be triggered if thousands of mounts are suddently executed.
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Fixup for 4a3a9ef610.
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When creating a new mount unit after an event on /proc/self/mountinfo,
check the mount options as well as the fstype to determine if this is a
remote mount that requires network access.
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This is an attempt to add it the remote-fs dependencies to a mount unit
if the options change, like when the utab options are picked up after
mountinfo has already been processed. It just adds the remote-fs
dependencies, leaving the local-fs ones in place.
With this change I always get mount units with proper remote-fs
dependencies when mounted with the _netdev option.
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Parsing the mount table with libmount races against the mount command,
which will handle the actual mounting before updating utab. This means
the poll event on /proc/self/mountinfo can kick of a reparse in systemd
before the utab information is available.
This change adds in an additional event source using inotify to watch
for changes to utab. It only watches for IN_MOVED_TO events, matching
libmount behavior of always overwriting this file using rename(2).
This does add a second pass through the mount table parsing when utab is
updated.
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This lets libmount add in user options from /run/mount/utab, like
_netdev which is needed to get proper ordering against remote-fs.target
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It corrrectly handles both positive and negative errno values.
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As a followup to 086891e5c1 "log: add an "error" parameter to all
low-level logging calls and intrdouce log_error_errno() as log calls
that take error numbers", use sed to convert the simple cases to use
the new macros:
find . -name '*.[ch]' | xargs sed -r -i -e \
's/log_(debug|info|notice|warning|error|emergency)\("(.*)%s"(.*), strerror\(-([a-zA-Z_]+)\)\);/log_\1_errno(-\4, "\2%m"\3);/'
Multi-line log_*() invocations are not covered.
And we also should add log_unit_*_errno().
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Also, while we are at it, introduce some syntactic sugar for creating
ERRNO= and MESSAGE= structured logging fields.
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- Rename log_meta() → log_internal(), to follow naming scheme of most
other log functions that are usually invoked through macros, but never
directly.
- Rename log_info_object() to log_object_info(), simply because the
object should be before any other parameters, to follow OO-style
programming style.
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If for any reason the check failed (selinux?), we would still issue
the warning. Check the return status.
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subhierarchies
For priviliged units this resource control property ensures that the
processes have all controllers systemd manages enabled.
For unpriviliged services (those with User= set) this ensures that
access rights to the service cgroup is granted to the user in question,
to create further subgroups. Note that this only applies to the
name=systemd hierarchy though, as access to other controllers is not
safe for unpriviliged processes.
Delegate=yes should be set for container scopes where a systemd instance
inside the container shall manage the hierarchies below its own cgroup
and have access to all controllers.
Delegate=yes should also be set for user@.service, so that systemd
--user can run, controlling its own cgroup tree.
This commit changes machined, systemd-nspawn@.service and user@.service
to set this boolean, in order to ensure that container management will
just work, and the user systemd instance can run fine.
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if sigabrt doesn't do the job, follow regular shutdown
routine, sigterm > sigkill.
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This reverts commit 141a1ceaa62578f1ed14f04cae2113dd0f49fd7f.
People should fix their libc's getopt(), instead of us using a weird
option ordering...
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This way, the list of arguments to that function gets more comprehensive,
and we can get around passing lots of NULL and 0 arguments from socket.c,
swap.c and mount.c.
It also allows for splitting up the code in exec_spawn().
While at it, make ExecContext const in execute.c.
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This makes no difference if /usr was mounted in the initrd,
and brings the behaviour of legacy systems closer to those
with a propper initrd.
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Instead of adjusting job timeouts in the core, let fstab-generator
write out a dropin snippet with the appropriate JobTimeout.
x-systemd-device.timeout option is removed from Options= line
in the generated unit.
The functions to write dropins are moved from core/unit.c to
shared/dropin.c, to make them available outside of core.
generator.c is moved to libsystemd-label, because it now uses
functions defined in dropin.c, which are in libsystemd-label.
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"-s" switch
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/etc/mtab should die die die. It's sad enough util-linux still contains
support for it, but we don't have to partake in that charade, so let's
turn this off.
This is in-line with the fact that since years we already have been
"tainting" systemd if we detect /etc/mtab not being a symlink...
Of course, util-linux is currently broken, and still touches /etc/mtab,
weven if we pass "--no-mtab" to it:
https://bugzilla.redhat.com/show_bug.cgi?id=1109367
But hey, let's hope that gets fixed quickly, even if total removal of
/etc/mtab support from util-linux might not happen so quickly...
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For now only What=, Options=, Type= are supported, and Where= is deduced
from the unit name.
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CLOCK_BOOTTIME_ALARM, too
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Let's automatically initialize the kill, exec and cgroup contexts of the
various unit types when the object is constructed, instead of
invididually in type-specific code.
Also, when PrivateDevices= is set, set DevicePolicy= to closed.
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As discussed on the ML these are useful to manage runtime directories
below /run for services.
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BlockIOAccounting= for all units at once
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