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This usually happens for device units with long
path in /sys. But users can't even create such drop-ins,
so lets just ignore the error here.
Fixes#6867
This makes sense from the point of view of the whole distribution:
if there are some specific files that have syntax problems, or unknown
users or groups, or use unsupported features, failing the whole service
is not useful.
In particular, services with tmpfiles --boot should not be started after boot.
The premise of --boot is that there are actions which are only safe to do once
during boot, because the state evolves later through other means and re-running
the boot-time setup would destroy it. If services with --boot fail in the
initial transaction, they would be re-run later on when a unit which
(indirectly) depends on them is started, causing problems.
Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1507501.
(If we had a mode where a service would at most run once, and would not be
started in subsequent transactions, that'd be a good additional safeguard.
Using ExecStart=-... is a bit like that, but it causes all failure to be
ignored, which is too big of a hammer.)
In this way, individual errors in files can be treated differently than a
failure of the whole service.
A test is added to check that the expected value is returned.
Some parts are commented out, because it is not. This will be fixed in
a subsequent commit.
This fixes various typos, removes some duplications, and adds a bit more
detail in the few places which are potential pitfalls for users.
Also change the way the paragraphs about new options begin, because having
a paragraph saying "Two new options have been added", and then bit lower
again "Two new options have been added" is confusing.
Apparently, the kernel returns EINVAL on NFS4 sometimes, even if we do
everything right, let's fallback in that case and find a different
approach to determine if something's a mount point.
See discussion at:
https://github.com/systemd/systemd/issues/7082#issuecomment-348001289
Let's not use local process data for remote processes, that can only
show nonsense.
Maybe one day we should add a bus API to query the comm field of a
process remotely, but for now, let's not bother, the information is
redundant anyway, as the cgroup data shows it too (and the cgroup tree
is show as part of status as well, and is requested from remote through
dbus, without local kernel calls).
Fixes: #7516
Now the function returns an empty string when given an empty string.
Not sure if this is the best option (maybe this should be an error?),
but at least the behaviour is well defined.
We let the caller make the decision. Existing callers are OK with treating an
ambiguous result the same as no content, but makefs and growfs should refuse such
partitions.
I opted to completely generate a unit for both mount points and swaps. For
swaps, it would be possible to use fixed template unit like systemd-mkswap@.service,
because there's no information passed except the device name. For mount points,
that's not possible because both the device name and file system type need to
be passed. Nevertheless, I expect that options will need to passed to both mkfs
and mkswap, in which case it'll be necessary to create units of both types
anyway.
Also do not include libcryptsetup.h directly, but only through crypt-util.h.
This way we do not have to repeat the define in every file where it is used.
The kernel will reply with -ENOTDIR when we try to access a non-directory under
a name which ends with a slash. But our functions would strip the trailing slash
under various circumstances. Keep the trailing slash, so that
path_is_mount_point("/path/to/file/") return -ENOTDIR when /path/to/file/ is a file.
Tests are added for this change in behaviour.
Also, when called with a trailing slash, path_is_mount_point() would get
"" from basename(), and call name_to_handle_at(3, "", ...), and always
return -ENOENT. Now it'll return -ENOTDIR if the mount point is a file, and
true if it is a directory and a mount point.
v2:
- use strip_trailing_chars()
v3:
- instead of stripping trailing chars(), do the opposite — preserve them.
RequiredForOnline= denotes a link/network that does/does not require being up
for systemd-networkd-wait-online to consider the system online; this makes it
possible to ignore devices without modifying parameters to wait-online.
When using SELinux with legacy cgroups the tmpfs on /sys/fs/cgroup is by
default labelled as tmpfs_t. This label is also inherited by the "cpu"
and "cpuacct" symbolic links. Unfortunately the policy expects them to
be labelled as cgroup_t, which is used for all the actual cgroup
filesystems. Failure to do so results in a stream of denials.
This state cannot be fixed reliably when the cgroup filesystem structure
is set-up as the SELinux policy is not yet loaded at this
moment. It also cannot be fixed later as the root of the cgroup
filesystem is remounted read-only. In order to fix it the root of the
cgroup filesystem needs to be temporary remounted read-write, relabelled
and remounted back read-only.
This makes sure we migrate /var/lib/<foo> if it exists to
/var/lib/private/<foo> if DynamicUser=1 is set. This is useful to allow
turning on DynamicUser= on services that previously didn't use it, and
we can deal with this, and migrate the relevant directories as
necessary.
Note that "downgrading" from DynamicUser=1 backto DynamicUser=0 works
too. However in that case we simply continue to use
/var/lib/private/<foo>, which works because /var/lib/<foo> is a symlink
there after all.