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This adds --empty=create and --size= for creating loopback files from
scratch of a specified size, or growing loopback files to the specified
size when they already exist.
This is useful when operating on disk image files, as a manual
invocation of fallocate(1) becomes unnecessary.
While investigating why some of my netlink calls would timeout I
stumbled upon the definition of the max write queue length. Finding this
constant made me believe we still had a write queue in the code - which
isn't true. The netlink write queue code was removed in #189.
Let's use size_t for numbers of entries in memory.
Let's use const wherever appropriate.
Drop `_server` suffix from function name where we don't have it for
similar other cases.
- Parse the tags list using strv_split_newlines() which remove any
unnecessary empty string at the end of the strv.
- Use this parsed list for manager_process_barrier_fd() and every call
to manager_invoke_notify_message().
- This also allow to simplify the manager_process_barrier_fd() function.
Check:
- There is only 3 messages logged with type stdout
- Check all messages logged does not have new line: LINE_BREAK=eof
- Check that the 3 messages are logged from a different PID
- Check the 3 MESSAGE= content
Let's introduce an explicit line ending marker for line endings due to
pid change.
Let's also make sure we don't get confused with buffer management.
Fixes: #15654
If the previous received buffer length is almost equal to the allocated
buffer size, before this change the next read can only receive a couple
of bytes (in the worst case only 1 byte), which is not efficient.
libzstd is a new dependency for systemd that's not in a stable release
yet, so it's not pulled in by the RPM package dependency. Manually
include it in the package section so the image mkosi produces works. It
can be removed when the RPM depends on it.
Additionally, a number of packages in the list appear to be pulled in
because they're dependencies in the systemd rpm, so remove them.
Finally, mkosi v5 adds the proper fs utilities for bootable images type
so drop that dependency as well.
Limit size of various tmpfs mounts to 10% of RAM, except volatile root and /var
to 25%. Another exception is made for /dev (also /devs for PrivateDevices) and
/sys/fs/cgroup since no (or very few) regular files are expected to be used.
In addition, since directories, symbolic links, device specials and xattrs are
not counted towards the size= limit, number of inodes is also limited
correspondingly: 4MB size translates to 1k of inodes (assuming 4k each), 10% of
RAM (using 16GB of RAM as baseline) translates to 400k and 25% to 1M inodes.
Because nr_inodes option can't use ratios like size option, there's an
unfortunate side effect that with small memory systems the limit may be on the
too large side. Also, on an extremely small device with only 256MB of RAM, 10%
of RAM for /run may not be enough for re-exec of PID1 because 16MB of free
space is required.
