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install_subdir() does not copy symlinks but copies the file they
point to. We also get a very ugly warning in the meson install
output:
"""
Warning: trying to copy a symlink that points to a file. This will copy the file,
but this will be changed in a future version of Meson to copy the symlink as is. Please update your
build definitions so that it will not break when the change happens.
"""
Let's fix both problems at once by using rsync which does the right
thing. Verified by running systemd-dissect --mtree on both the install
output before and after and all the symlinks are now correctly preserved.
An error reply from polkit is a valid case and should not be propagated
as failure of async_polkit_callback(). It should only be saved here.
It'll be returned by bus_verify_polkit_async() later, when it's called
for the same method again.
Follow-up for #26365.
Setting USEC_INFINITY to timer event source should not cause any
problem. But, disabling timer event source should be preferable.
[zjs: simplify the call to sd_event_source_set_enabled()]
If someone reads /run/host/os-release at the exact same time it is being updated, and it
is large enough, they might read a half-written file. This is very unlikely as
os-release is typically small and very rarely changes, but it is not
impossible.
Bind mount a staging directory instead of the file, and symlink the file
into into, so that we can do atomic file updates and close this gap.
Atomic replacement creates a new inode, so existing bind mounts would
continue to see the old file, and only new services would see the new file.
The indirection via the directory allows to work around this, as the
directory is fixed and never changes so the bind mount is always valid,
and its content is shared with all existing services.
Fixes https://github.com/systemd/systemd/issues/28794
Follow-up for 3f37a82545d461ab
Let's make sure btrfs_subvol_make() can operate on O_PATH fds, just like
mkdirat().
Fixes a bunch of tmpfiles errors at boot if we try to create btrfs
subvols, introduced by e54c79ccc2e90a375640815b05f28ec22664e44c
Fixes: e54c79ccc2e90a375640815b05f28ec22664e44c
After f58269510727964cb5c10e7d2f9849c442ea1f80, the wrong behavior
occurred when --since= and --lines= are both specified is fixed.
However, it seems that the old behavior is already being somewhat
widely used, and the function itself makes sense, i.e. to allow --lines=
to output the first N journal entries.
Therefore, let's support prefixing the number for --lines= with '+',
and provide such functionality.
Related: #28746
exec_child() is supposed to set *exit_status when returning failure.
Unfortunately, we didn't do that in two cases. The result would be:
- a bogus error message "Failed at step SUCCESS spawning foo: …",
- a bogus success exit status.
Bugs introduced in 390902012c5177b6b01bc634b2e9c704073d9e7d and
ad21e542b20f0fb292d1958d3a759bf3403522c2.
The code is reworked to add some asserts and not set exit_status in the caller
so that it's clearer (also to the compiler) that it needs to be set.
This is useful if the variable is ssize_t and we don't want to trigger a
warning or truncation.
With gcc (gcc-13.2.1-1.fc38.x86_64), the resulting systemd binary is identical,
so I assume that the compiler is able to completely optimize away the type.
