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So far we already had the CopyFiles= option in systemd-repart drop-in
files, as a mechanism for populating freshly formatted file systems with
files and directories. This adds MakeDirectories= in similar style, and
creates simple directories as listed. The option is of course entirely
redundant, since the same can be done with CopyFiles= simply by copying
in a directory. It's kinda nice to encode the dirs to create directly in
the drop-in files however, instead of providing a directory subtree to
copy in somehere, to make the files more self-contained — since often
just creating dirs is entirely sufficient.
The main usecase for this are GPT OS images that carry only a /usr/
tree, and for which a root file system is only formatted on first boot
via repart. Without any additional CopyFiles=/MakeDirectories=
configuration these root file systems are entirely empty of course
initially. To mount in the /usr/ tree, a directory inode for /usr/ to
mount over needs to be created. systemd-nspawn will do so automatically
when booting up the image, as will the initrd during boot. However, this
requires the image to be writable – which is OK for npawn and
initrd-based boots, but there are plenty tools where read-only operation
is desirable after repart ran, before the image was booted for the first
time. Specifically, "systemd-dissect" opens the image in read-only to
inspect its contents, and this will only work of /usr/ can be properly
mounted. Moreover systemd-dissect --mount --read-only won't succeed
either if the fs is read-only.
Via MakeDirectories= we now provide a way that ensures that the image
can be mounted/inspected in a fully read-only way immediately after
systemd-repart completed. Specifically, let's consider a GPT disk image
shipping with a file usr/lib/repart.d/50-root.conf:
[Partition]
Type=root
Format=btrfs
MakeDirectories=/usr
MakeDirectories=/efi
With this in place systemd-repart will create a root partition when run,
and add /usr and /efi into it as directory inods. This ensures that the
whole image can then be mounted truly read-only anf /usr and /efi can be
overmounted by the /usr partition and the ESP.
libfdisk appears to return NULL when encountering an empty partition
label, let's handle this sanely, and treat NULL and "" for the current
label as the same, but for the new label as distinct: there NULL means
nothing is set, and "" means an actual empty label.
This is similar to the --image= switch in the other tools, like
systemd-sysusers or systemd-tmpfiles, i.e. it apply the configuration
from the image to the image.
This is particularly useful for downloading minimized GPT image, and
then extending it to the desired size via:
# systemd-repart --image=foo.image --size=5G
Let's have one flag to request that when dissecting an image the
loopback device is made read-only, and another one to request that when
it is mounted to make it read-only. Previously both concepts were always
done read-only together.
(Of course, making the loopback device read-only but mounting it
read-write doesn't make too much sense, but the kernel should catch that
for us, no need to make restrictions from our side there)
Use-case for this: in systemd-repart we'd like to operate on images for
adding partitions. Thus we'd like to have the loopback device writable,
but if we read repart.d/ snippets from it, we want to do that read-only.
Add the Sierra Wireless EM7345-LTE modem to the list of USB devices which
can safely autosuspend. This helps the processor reach deaper PC# states
when idle.
This was tested on a ThinkPad8 tablet with such a modem builtin.
systemd-networkd.socket can re-start systemd-networkd.service in
shutdown and by doing this even stop shutdown.target leaving the
system in halfway-down state.
Fixes#4955.
This code was partially broken, since the firmware directory was
undefined. Also, some of the parts were a dead code, since they relied
on code from the original dracut test suite.
`command -v <bin> | grep ...` can under certain conditions cause the
`command` to exit with SIGPIPE, which in combination with `set -o
pipefail` means that the tests sometimes randomly die during setup.
Let's avoid using pipes in such cases.
This breaks some existing loops which previously ignored if the piped
program exited with EC >0. Rewrite them to mitigate this (and also make
them more robust in some cases).
This fixes maybe-uninitialized warning:
```
../src/basic/fileio.c: In function ‘chase_symlinks_and_fopen_unlocked’:
../src/basic/fileio.c:1026:19: warning: ‘f’ may be used uninitialized in this function [-Wmaybe-uninitialized]
1026 | *ret_file = f;
| ~~~~~~~~~~^~~
```
