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$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.
This makes sure that after a server could not be contacted due to a
socket error, other (possibly working) NTP servers in the list of
configured NTP servers are (re-)tried.
Fixes#25728.
systemd uses malloc_usable_size() everywhere to use memory blocks
obtained through malloc, but that is abuse since the
malloc_usable_size() interface isn't meant for this kind of use, it is
for diagnostics only. This is also why systemd behaviour is flaky when
built with _FORTIFY_SOURCE.
One way to make this more standard (and hence safer) is to, at every
malloc_usable_size() call, also 'reallocate' the block so that the
compiler can see the larger size. This is done through a dummy
reallocator whose only purpose is to tell the compiler about the larger
usable size, it doesn't do any actual reallocation.
Florian Weimer pointed out that this doesn't solve the problem of an
allocator potentially growing usable size at will, which will break the
implicit assumption in systemd use that the value returned remains
constant as long as the object is valid. The safest way to fix that is
for systemd to step away from using malloc_usable_size() like this.
Resolves#22801.
EINVAL suggests that the caller passes an invalid argument. EIO is
for "input/output error", i.e. the error you'd get if the disk or
file system is borked, and this error code could be returned by the
underlying read/write functions.
Let's make the functions return an unambiguous error code.
If the page size of a swap space doesn't match the page size of the
currently running kernel, swapon will fail. Let's instruct it to
reinitialize the swap space instead.
