Also drop the redundant states and make all similar changes too.
Thankfully the swap.c state engine is much simpler than mount.c's, hence
this should be easier to digest.
The function returns true for all states that have a control process
running, and each time we call it that's what we want to know, hence
let's rename it accordingly. Moreover, the more generic unit states have
an ACTIVE state, and it is defined quite differently from the set of
states this function returns true for, hence let's avoid confusion and
not reuse the word "ACTIVE" here in a different context.
Finally, let's uppercase this, since in most ways it's pretty much
identical to a macro
This changes the mount unit state engine in the following ways:
1. The MOUNT_MOUNTING_SIGTERM and MOUNT_MOUNTING_SIGKILL are removed.
They have been pretty much equivalent to MOUNT_UNMOUNTING_SIGTERM and
MOUNT_UNMOUNTING_SIGKILL in what they do, and the outcome has been
the same as well: the unit is stopped. Hence, let's simplify things a
bit, and merge them. Note that we keep
MOUNT_REMOUNTING_{SIGTERM|SIGKILL} however, as those states have a
different outcome: the unit remains started.
2. mount_enter_signal() will now honour the SendSIGKILL= option of the
mount unit if it was set. This was previously done already when we
entered the signal states through a timeout, and was simply missing
here.
3. A new helper function mount_enter_dead_or_mounted() is added that
places the mount unit in either MOUNT_DEAD or MOUNT_MOUNTED,
depending on what the kernel thinks about the mount's state. This
function is called at various places now, wherever we finished an
operation, and want to make sure our own state reflects again what
the kernel thinks. Previously we had very similar code in a number of
places and in other places didn't recheck the kernel state. Let's do
that with the same logic and function at all relevant places now.
4. Rework mount_stop(): never forget about running control processes.
Instead: when we have a start (i.e. a /bin/mount) process running,
and are asked to stop, then enter the kill states for it, so that it
gets cleaned up. This fixes#6048. Moreover, when we have a reload
process running convert the possible states into the relevant
unmounting states, so that we can properly execute the requested
operation.
Fixes#6048
Let's only collect the first failure in the load result, and let's clear
it explicitly when we are about to enter a new reload operation. This
makes it more alike the handling of the main result value (which also
only stores the first failure), and also the handling of service.c's
reload state.
This variable is not set by meson, so let's not try to use it.
We could use some more elaborate scheme (e.g. based on $MESON_BUILD_ROOT and
$MESON_SUBDIR) to find the path to systemd-sysv-generator, but it seems
that plain ./systemd-sysv-generator works just as well and has the advantage
that it's easy to invoke the test by hand (as long as one cd's to the
meson build dir).
Let's read one byte more than the file size we read from stat() on the
first fread() invocation. That way, the first read() will already be
short and indicate eof to fread().
This is a minor optimization, and replaces #3908.
LONG_LINE_MAX is much like LINE_MAX, but longer.
As it turns out LINE_MAX at 4096 is too short for many usecases. Since
the general concept of having a common maximum line length limit makes
sense let's add our own, and make it larger (1MB for now).
read_line() is much like getline(), and returns a line read from a
FILE*, of arbitrary sizes. In contrast to gets() it will grow the buffer
dynamically, and in contrast to getline() it will place a user-specified
boundary on the line.
Due to the chown() logic socket units might end up with processes even
if no explicit command is defined for them, hence let's make sure these
processes are in the right cgroup, and that means within a slice.
Mount, swap and service units unconditionally are assigned to a slice
already, let's do the same here, too.
(This becomes more important as soon as the ebpf/firewall stuff is
merged, as there'll be another reason to fork off processes then)
On cgroupsv2 we should also chown()/chmod() the subtree_control file,
so that children can use controllers the way they like.
On cgroupsv1 we should also chown()/chmod() cgroups.clone_children, as
not setting this for new cgroups makes little sense, and hence delegated
clients should be able to write to it.
Note that error handling for both cases is different. subtree_control
matters so we check for errors, but the clone_children/tasks stuff
doesn't really, as it's legacy stuff. Hence we only log errors and
proceed.
Fixes: #6216
These errors don't really matter, that's why we log and proceed in the
current code. However, we currently log at LOG_WARNING, but we really
shouldn't given that this is library code. Hence downgrade this to
LOG_DEBUG.
We would not consider symlinks in /etc/systemd/user/*.{wants,requires}/
towards the user unit being "enabled", because the symlinks were not
located in "config" paths. But this is confusing to users, since those units
are clearly enabled and will be started. So let's muddle the definition of
enablement a bit to include the paths only accessible to root when looking for
enabled user units.
Fixes#4432.
I think this matches the spirit of "indirect" well: the unit
*might* be active, even though it is not "installed" in the
sense of symlinks created based on the [Install] section.
The changes to test-install-root touch the same lines as in the previous
commit; the change in each case is from
assert_se(unit_file_get_state(...) >= 0 && state == UNIT_FILE_ENABLED)
to
assert_se(unit_file_get_state(...) >= 0 && state == UNIT_FILE_DISABLED)
to
assert_se(unit_file_get_state(...) >= 0 && state == UNIT_FILE_INDIRECT)
in the last two commits.
