The man page doesn't even mention errno. It just says that ferror() should
be used to check for errors. Those writes are unlikely to fail, but if they
do, errno might even be 0. Also, we have fflush_and_check() which does
additional paranoia around errno, because we apparently do not trust that
errno will always be set correctly.
This is a fancy wrapper around "cat <<EOF", but:
- the user doesn't need to figure out the file name,
- parent directories are created automatically,
- daemon-reload is implied,
so it's a convenient way to create units or drop-ins.
Closes https://github.com/systemd/systemd/issues/21862.
If /run/nextroot/ has been set up, use it, even if the inodes are
the same. It could be a verity device that is reused, but with
different sub-mounts or other differences. Or the same / tmpfs with
different /usr/ mounts. If it was explicitly set up we should use it.
Use the new helper to check that the mount IDs are also the same,
not just the inodes.
If the user edits result in an empty file (after stripping), we would silently
not do anything, aborting the edit. This is rather confusing, let's emit a
notice:
$ build/systemctl --user edit asdf.service --full --stdin </dev/null
/home/zbyszek/.config/systemd/user/asdf.service: after editing, new contents are empty, not writing file.
(This also works with an editor, instead of --stdin. The message is printed on
the console and is visible after the editor exits.)
While at it, fix the condition to skip writing file after stripping. We had
"old_contents", but we modified that string. In some code flows, we would
compare the stripped old contents (i.e. a string which by defintion doesn't
have a newline at the end) with a string to which we just appended a newline
(i.e. a string which by defintion has a newline at the end).
In preparation for future changes: I want to add a mode where interactive
editing is not done, and when this preparation is moved to a helper, it's much
easier to skip it.
e->line is initialized to 1 and overwritten even if sync fails. Theoretically
this is against our style, but the alternative is to propagate a temporary
value of line through the layers, which adds a lot of noise. If we fail, this
EditFile object will not be used for anything, to the changed value of .line
has no effect.
Follow-up for a628d933cc
HibernateInfo.from_efi is not actually useful. info.efi is only
set if the system identifier stored in EFI variable matches with
that of the running system, and thus the variable should be cleared
no matter whether resume= is set from kernel cmdline or not.
SELinux logs before we have a chance to apply it, move it up as it
breaks TEST-04-JOURNAL:
[ 408.578624] testsuite-04.sh[11463]: ++ journalctl -b -q -u silent-success.service
[ 408.578743] testsuite-04.sh[11098]: + [[ -z Dec 03 13:38:41 H systemd-executor[11459]: SELinux enabled state cached to: disabled ]]
Follow-up for: bb5232b6a3
The regexp only worked if the sections were small enough for the size to
start with "0". I have an initrd that is 0x1078ec7e bytes, so the tests
would spuriously fail.
Follow-up for 2331c02d06.
Note, currently, the function is always called with SCMP_ACT_ALLOW as
the default action, except for the test. So, this should not change
anything in the runtime code.
arg_description was either set to arg_unit (i.e. a const char*), or to
char *description, the result of allocation in run(). But description
was decorated with _cleanup_, so it would be freed when going out of the
function. Nothing bad would happen, because the program would exit after
exiting from run(), but this is just all too messy.
Also, strv_join(" ") + shell_escape() is not a good way to escape command
lines. In particular, one the join has happened, we cannot distinguish
empty arguments, or arguments with whitespace, etc. We have a helper
function to do the escaping properly, so let's use that.
Fixup for 2c29813da3.
glibc starting using fchmodat2 to implement fchmod with flags [1], but
current version of libseccomp does not support fchmodat2 [2]. This is
causing problems with programs sandboxed by systemd. libseccomp needs to know
a syscall to be able to set any kind of filter for it, so for syscalls unknown
by libseccomp we would always do the default action, i.e. either return the
errno set by SystemCallErrorNumber or send a fatal signal. For glibc to ignore
the unknown syscall and gracefully fall back to the older implementation,
we need to return ENOSYS. In particular, tar now fails with the default
SystemCallFilter="@system-service" sandbox [3].
This is of course a wider problem: any time the kernel gains new syscalls,
before libseccomp and systemd have caught up, we'd behave incorrectly. Let's
do the same as we already were doing in nspawn since
3573e032f2, and do the "default action" only
for syscalls which are known by us and libseccomp, and return ENOSYS for
anything else. This means that users can start using a sandbox with the new
syscalls only after libseccomp and systemd have been updated, but before that
happens they behaviour that is backwards-compatible.
[1] https://github.com/bminor/glibc/commit/65341f7bbea824d2ff9d37db15d8be162df42bd3
[2] https://github.com/seccomp/libseccomp/issues/406
[2] https://github.com/systemd/systemd/issues/30250
Fixes https://github.com/systemd/systemd/issues/30250.
In seccomp_restrict_sxid() there's a chunk conditionalized with
'#if defined(__SNR_fchmodat2)'. We need to kep that because seccomp_restrict_sxid()
seccomp_restrict_suid_sgid() uses SCMP_ACT_ALLOW as the default action.
Since we accept that setfont(8) can fail with EX_OSERR and we dont treat it as
an error, dont log this failure at LOG_ERR.
Before:
-------
/usr/bin/setfont failed with exit status 71. [LOG_ERR]
Setting fonts failed with a "system error", ignoring. [LOG_NOTICE]
After:
-----
/usr/bin/setfont failed with a "system error" (EX_OSERR), ignoring. [LOG_NOTICE]
Setting source virtual console failed, ignoring remaining ones [LOG_NOTICE]
Follow-up for 93c9a9d235
DeprecationWarning: datetime.datetime.utcnow() is deprecated and scheduled for
removal in a future version. Use timezone-aware objects to
represent datetimes in UTC: datetime.datetime.now(datetime.UTC).
The difference between the two is that .now(datetime.UTC) returns an object with
a timezone attached, "the numbers" are the same.
>>> datetime.datetime.utcnow(), datetime.datetime.now(datetime.UTC)
(datetime.datetime(2023, 12, 1, 9, 37, 53, 891669),
datetime.datetime(2023, 12, 1, 9, 37, 53, 891688, tzinfo=datetime.timezone.utc))
This value is fed to cryptography's x509.CertificateBuilder object, so as long
as it can accept a datetime object with tzinfo, the result should be identical.
Yu Watanabe
Daan De Meyer
Luca Boccassi
Zbigniew Jędrzejewski-Szmek
Mike Yuan
Дамјан Георгиевски
Neil Wilson
Franck Bui