As it turns out open() with O_PATH does *not* trigger autofs, you get a
reference to the autofs inode, if not triggered.
But there's a way out: open_tree() (when specified without
OPEN_TREE_CLONE) is actually fully equivalent to open() with O_PATH –
with the exception of one thing: it *does* trigger automounts.
Thanks for Christian Brauner for pointing me to this and saving my day.
Fixes: #33155
bus_append_unit_property() and associated functions accept a long list of
properties. But the specific names are only available through code. But it is
useful to be able to know the specific list of properties that is supported, in
particular for shell completions. Thus, add a way to list the properties that
are supported by the code.
In the future we could also turn this into a test for the documentation. For
various reasons, the list of properties listed in the docs is a partially
overlapping set. E.g. for service type, the pull request
https://github.com/systemd/systemd/pull/37661 creates a list with 212 entries,
and this code generates 7 entries less and 184 more. I didn't check all the
differences, but in the few cases I did, the list generated here was actually
correctly supported by 'systemd-run -p'.
A smoke test is added.
We're still discussing whether we want to remove this or not, but
regardless of whether we end up removing it or not, it's something
we add ourselves and as such should not live in our headers that
override glibc headers, so let's move it to fd-util.h.
This is not something that comes from glibc, but which we invent
ourselves. As such, it should not be part of our overrides of glibc
headers, but instead should be part of one of our own headers, so
let's move it to fd-util.h.
Follow up for 194a690181
Alternative to b50f6dbe57
The commit naively returned early from socket_enter_running(), which however
is quite problematic, as the socket will be woken up over and over again
without doing a thing, until we eventually hit Poll/TriggerLimit*=.
On top of that it requires hacks to hold the start job for initrd-switch-root.service
up. Overall I doubt that is the right approach.
Let's instead hook this into our job engine, and try to activate
the service again when some other units are stopped. If all installed
jobs have been run yet we're still seeing the conflict or the manually
selected timeout is reached, fail the socket as before.
We use symbols provided by unistd.h without including it. E.g.
open(), close(), read(), write(), access(), symlink(), unlink(), rmdir(),
fsync(), syncfs(), lseek(), ftruncate(), fchown(), dup2(), pipe2(),
getuid(), getgid(), gettid(), getppid(), pipe2(), execv(), _exit(),
environ, STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO, F_OK, and their
friends and variants, so on.
Currently, unistd.h is indirectly included mainly in the following two paths:
- through missing_syscall.h, which is planned to covert to .c file.
- through signal.h -> bits/sigstksz.h, which is new since glibc-2.34.
Note, signal.h is included by sd-eevent.h. So, many source files
indirectly include unistd.h if newer glibc is used.
Currently, our baseline on glibc is 2.31. We need to support glibc older
than 2.34, but unfortunately, we do not have any CI environments with
such old glibc. CIFuzz uses glibc-2.31, but it builds only fuzzers, and
many files are even not compiled.
Before 50c81130b6, the function used
chase(), hence if root is an empty string, each config directory made
prefixed with the current working directory if it is relative. See
implementation of chase().
With 50c81130b6, conf_files_list_strv()
internally uses chaseat(), hence each config directory is not prefixed
anymore even if it is relative.
To restore the previous behavior, this makes
- if root is an empty string, prefix each config directories with the
current working directory if relative.
- if root is relative, make it absolute to make the prefixed results also
absolute, and debugging logs show absolute paths.
- use chaseat_prefix_root() to prefix the results, for safety.
Follow-ups for 50c81130b6.
And rename it to empty_or_root_harder_to_null(), as it also checks if
the input path effectively points to the root by calling path_is_root().
This also adds simple test cases for the function.
This reverts commit 49653adef3.
The commit was merged without review, and has several issues.
Let's revert the change now, and address the issue pointed out by
the commit later in another way.
[1] says:
> Since 0.60.0 the name argument is optional and defaults to the basename of
> the first output
We specify >= 0.62 as the supported version, so drop the duplicate name in all cases
where it is the same as outputs[0], i.e. almost all cases.
[1] https://mesonbuild.com/Reference-manual_functions.html#custom_target
Previously, symlinks in the replacement was not chased, hence we may
inserted a path to outside of the root directory, or we may have wrong
judgement whether we should insert the replacement or not.
This makes the symlinks in the replacement also resolved.
Also, as the function is only used by tmpfiles and sysusers, this
enables CONF_FILES_REGULAR, CONF_FILES_CHASE_BASENAME, and
CONF_FILES_FILTER_MASKED_BY_SYMLINK flags.
Previously, when a root directory is specified to conf_files_list() and
friends, the last component of each result was not resolved, even though
they internally chases the last component. So the caller needs to chase
the path again when the file is used.
This introduce a new flag that makes the whole path of each result is
resolved, hence caller can use it as is.
Previously, symlinks in paths to conf directories are chased, but
symlink files in conf directories were not.
This also makes symlink files in conf directories chased. And, any
unresolvable symlinks are dropped, even if no verification is requested.
TCSADRAIN means tcsetattr() will become blocking (waiting for ability to
write out queued bytes), which is problematic, if the referenced TTY is
dead for some reason.
Since all these calls just modify *input* parameters anyway (i.e. mostly
local echo, and canonical mode), forcing out queued output is kinda
pointless anyway, hence just don't do it: leave it in the queue and just
change the flags we want to change.
The tcsetattr(3) man page kinda hints that we want to use TCSANOW here,
because it documents for TCSADRAIN:
"This option should be used when changing parameters that affect
output."
Which one can read so that TCSADRAIN should not be used if it doesn't
affect output, which is the case here.
This probably fixes: #37854
This reverts commit 50cda6433b.
Same as the previous revert, sched.h is too generic to
be included in namespace-util.h, plus this defeats
the purpose of forward decl.
This reverts commit 4d0fe93cba.
I'm not convinced by the reasoning here. The practice of
forward declarations should be confined in headers only,
and any actual invocation of functions in source files
needs to include the original header. strv_split_full()
for instance takes ExtractFlags, and callers will need
to include extract-word.h to get the value definitions.
Now, indeed some -util headers export the most relevant
system header too, notably pidfd-util. But fs-util doesn't
seem to be coupled with any specific header, hence I'm
skeptical about such inclusion.
access_nofollow() is a simple wrapper of faccessat(), and it is defined as
```
int faccessat(int dirfd, const char *pathname, int mode, int flags);
```
fs-util.h provides access_nofollow() but it did not include neither
fcntl.h nor unistd.h, which define F_OK and friends. Hence we cannot use
the function without including one of the headers. Let's include fcntl.h
in fs-util.h, then we can use the function by simply including fs-util.h.
The additional definitions provided by the header are
- EXT4_IOC_RESIZE_FS, used in resize-fs.c,
- FILEID_KERNFS, used in cgroup-util.c and pidfd-util.c.
Let's drop the inclusion at other places.
Currently, callers of safe_glob() set an empty glob_t or glob_t with
opendir func, and all other components are always zero.
So, let's introduce safe_glob_full() which optionally takes opendir
function, rather than glob_t, and returns result strv, rather than
storing results in glob_t.
Also, introduce safe_glob() which is a trivial wrapper of
safe_glob_full() without opendir func.
No functional change, just refactoring.
Some configuration files that need updates are directly under in /etc. To
update them atomically, we need write access to /etc. For Ubuntu Core this is
an issue as /etc is not writable. Only a selection of subdirectories can be
writable. The general solution is symlinks or bind mounts to writable places.
But for atomic writes in /etc, that does not work. So Ubuntu has had a patch
for that that did not age well.
Instead we would like to introduce some environment variables for alternate
paths.
* SYSTEMD_ETC_HOSTNAME: /etc/hostname
* SYSTEMD_ETC_MACHINE_INFO: /etc/machine-info
* SYSTEMD_ETC_LOCALTIME: /etc/localtime
* SYSTEMD_ETC_LOCALE_CONF: /etc/locale.conf
* SYSTEMD_ETC_VCONSOLE_CONF: /etc/vconsole.conf
* SYSTEMD_ETC_ADJTIME: /etc/adjtime
While it is for now expected that there is a symlink from the standard, we
still try to read them from that alternate path. This is important for
`/etc/localtime`, which is a symlink, so we cannot have an indirect symlink or
bind mount for it.
Since machine-id is typically written only once and not updated. This commit
does not cover it. An initrd can properly create it and bind mount it.
Zbigniew Jędrzejewski-Szmek
Yu Watanabe
Lennart Poettering
Mike Yuan
DaanDeMeyer
Valentin David