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When an AP goes up, the kernel may emit a netlink event indicating that
the interface has gained carrier. In that event, we should check if the
SSID has changed before attempting to reconfigure. Not doing so means
that the link->ssid member is not updated, leading to a potential
mismatch if some of the .network configurations match on SSID=.
There are however scenarios where the above heuristic is not enough.
Specifically, if the interface carrier state flip-flops within a short
enough interval, the internal throttling of netlink events inside the
kernel may suppress intermediate linkdown+linkup events (cf. Linux
net/core/link_watch.c). So there is no linkup event to react on.
To improve on the latter scenario, it is proposed to make newer kernels
emit an NL80211_CMD_START_AP multicast event when an AP goes up. This
event will not be dropped by link_watch. systemd-networkd can then react
to such events as well, and optionally reconfigure the link if the SSID
has changed. This will only work with newer kernels though.
This reverts commit 5dd34c2604.
`resolvectl monitor` sends notify event, and systemd-run wait for the
service being in active state. Hence, the loop is not necessary.
Often it's useful to add multiple signatures in the signature JSON file
to embedd in a single .pcrsig. (For example, a signature by key X for
boot phase "enter-initrd" and one by key Y for
"enter-initrd:leave-initrd" or so). Make this easy, by adding the
ability to append signatures to a previously generated JSON file.
Use LogFilterPatterns from the unit's cgroup xattr in order to keep or
discard log messages before writing them to the journal.
When a log message is discarded, it won't be written to syslog, console...
either.
When a native, syslog, or standard output log message is received,
systemd-journald will process it if it matches against at least one
allowed pattern (if any) and none of the denied patterns (if any).
Define new unit parameter (LogFilterPatterns) to filter logs processed by
journald.
This option is used to store a regular expression which is carried from
PID1 to systemd-journald through a cgroup xattrs:
`user.journald_log_filter_patterns`.
Instead of having Minimize= take a boolean let's allow for two
different ways to enable it. "best" means we want the most minimal
image possible, which currently is only possible for read-only
filesystems but can be extended in the future with bisection
to find the most minimal possible size.
We also add "guess", which is the current behavior, where we
populate once and use the sparse size to make a reasonable guess
on a size that fits all the sources without needing to O(log(n))
tries to find the most minimal size.
$TERM would generally be set if we're connected to a proper graphical terminal
emulator. In all other cases, in particular if $TERM is not set, we almost
certainly are not connected to something that can output emojis. In particular
the text console is unlikely to ever do it correctly.
So let's invert the check, and only write emojis if $TERM is set.
Fixes#25521.
We *assume* that when /sys is read-only, we're running in a container. But
there can other reasons, for example root is mount ro and nobody has mounted
/sys yet, or somebody forgot to add /sys to the list of filesystem not to
remount ro in a sandbox. So let's actually say what we know instead of assuming.
systemd-fstab-generator was reporting that it's running in a container and I
spent a good few minutes trying to figure out why 'systemd-detect-virt -c'
disagrees, before noticing that it's just checking a different condition.
This is an octal number. We used the 0 prefix in some places inconsistently.
The kernel always interprets in base-8, so this has no effect, but I think
it's nicer to use the 0 to remind the reader that this is not a decimal number.
When generators are executed during early boot, /tmp might not be available
yet. This causes problems with bash, because here-docs don't work. Even
non-shell code can often assume that /tmp is available. This limitation is
known to trip up people, and when the code is tested on a "normal" system,
everything works.
We can solve this nicely, and get another small benefit, by making most of the
file system read-only and "punching holes" for some dirs that should be
writable. The generator code runs with full privileges and can do anything it
wants by writing appropriate systemd units, so it doesn't make much sense to do
any significant sandboxing around generators. But making root read-only is nice
because it can catch stupid mistakes where the generator tries to write to a
wrong path or something like that. We effectively also get a "private /tmp" for
the generators, which protects them against existing files in /tmp.
The path does the following:
when executing generators, we fork, and the child unshares root and makes
it recursively read-only, with the exception of /sys and /run. Error handling
is permissive — if some of this setup fails, we're in the same state as
before the patch.
Fixes#24430.
If the flag is set, we mount /tmp/ in a way that is suitable for generators and
other quick jobs.
Unfortunately I had to move some code from shared/mount-util.c to
basic/mountpoint-util.c. The functions that are moved are very thin wrappers
around mount(2), so this doesn't actually change much in the code split between
libbasic and libshared.
Implications for the host would be weird if a private mount namespace is not
used, so assert on FORK_NEW_MOUNTNS when the flag is used.
When executed on a systemd with an empty /etc/machine-id,
test-journal-interleaving fails in test_sequence_numbers_one() when
re-opening the existing "two.journal". This is because opening the
existing journal file with managed_journal_file_open() causes
journal_file_verify_header() to be called. This function tries to
compare the current machine-id to the machine-id in the journal file
header, but does not handle the case where the machine-id is empty or
non-existent.
Check if we have an initialized machine-id before executing this portion
of the test.
The part of test_chase_symlink in test-fs-util that calls
sd_id128_get_machine will fail if /etc/machine-id is empty, so skip this
block if the machine-id is not initialized.
