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No actual code changes, just splitting out of some dev_t handling
related calls from stat-util.[ch], they are quite a number already, and
deserve their own module now I think.
Also, try to settle on the name "devnum" as the name for the concept,
instead of "devno" or "dev" or "devid". "devnum" is the name exported in
udev APIs, hence probably best to stick to that. (this just renames a
few symbols to "devum", local variables are left untouched, to make the
patch not too invasive)
No actual code changes.
And while we are at it, let's use more appropriate open flags.
O_NONBLOCk is pointless in combination with O_NOFOLLOW.
O_NOFOLLOW makes a ton of sense otoh, since the inode is supposed to be
a dir, we just checked.
THe other flags are implied by xopendirat()
Currently if enumerating with debug logging you'll likely see something
like this:
sd-device: the syspath "/sys/class/devcoredump/disabled" is not a directory.
sd-device: the syspath "/sys/class/firmware/timeout" is not a directory.
sd-device: the syspath "/sys/class/zram-control/hot_remove" is not a directory.
sd-device: the syspath "/sys/class/zram-control/hot_add" is not a directory.
sd-device: the syspath "/sys/class/drm/version" is not a directory.
This is because these sysfs classes place regular files in these
directories, which we so far didn't expect.
Let's filter them early, and only bother with enumerated inodes if they
actually are dirs or symlinks, i.e. can be kobject dirs. Regular file
definitely never are kobject dirs...
Currently, for sysfs paths outside of /sys/devices/ we do better
checking if something is a suitable path: we check if it's actually a
directory, and if not return ENODEV.
Let's make the codepath for nodes *inside* of /sys/device/ similar:
let's also return ENODEV if the path supplied is not a directory.
Previously, we'd return ENOTDIR in that case, which is quite confusing I
think.
There are some file systems mounted below /sys/ that are not actually
sysfs, i.e. are not arranged in a sysfs/kobject style. Let's refuse
those early. (Example, /sys/fs/cgroup/ and similar.)
(Also, let's add an env var for this, so that it can be turned off for
test cases.)
chase_symlinks() can return its last O_PATH fd to us. Let's use that and
make the access() check a bit tighter by going via faccessat() on the
O_PATH fd.
This doesn't really change too much, but is nice in context of the next
commit, which uses the O_PATH fd in one other way.
This is inspired by this:
https://github.com/systemd/zram-generator/blob/main/src/generator.rs#L29
Given it's easy for PID 1 to pass this to generators, I thin we should.
All generators not written by us likely want to know these things so
that the can adjust to the execution environment.
let's better be safe and use heap allocation for paths which might be
unbounded.
In particular as previously we copied the stack memory to heap anyway,
via a noop path_make_absolute_cwd() call.
git archive automatically uses gzip when --output=*.tar.gz is used, but
not for other extensions. Thus we need to invoke the compressor separately :(
It's a good pattern to use a variable for the repeating number, so let's
recommend that.
With meson-0.60, meson compile stopped working with some targets:
$ meson compile -C build update-man-rules
ERROR: Can't invoke target `update-man-rules`: ambiguous name. Add target type and/or path: `PATH/NAME:TYPE`
This is obviously a regression in meson, but based on a chat with the
maintainers, it seems that there's some disagreement as to whether 'meson
compile' is useful and how exactly it should work. Since we're already at
meson 0.60.3 and this hasn't been fixed, and people generally don't seem to
consider this an issue, let's return to documenting the usual practice of
'ninja -C build' that just works everywhere.
(Since nobody has raised any fuss in systemd, it means that people are
generally using the shorter form during development too. I only noticed
because I pasted a command from the release docs when preparing -rc1.)
We got documentation for sd-device for the first time with
b51f4eaf7b58f064092215cea9c6fc1c5af5646e, so let's celebrate by adding a
landing page that also explains the relationship with libudev.
Several keyboard devices are erroneously tagged with ID_INPUT_JOYSTICK
because of random buttons they set. For example, the LiteOn Lenovo
Calliope USB Keyboard sets BTN_TRIGGER, BTN_TOP2, BTN_PINKIE and
BTN_BASE, see libinput issue 745 for details.
ID_INPUT_JOYSTICK triggers the uaccess rules, making those keyboards
easily accessible. That's not a problem in the LiteOn example since that
event node doesn't contain the normal keys and eavesdropping on volume
keys is probably not very interesting.
Improve the joystick detection by adding heuristics similar to what
libinput 1.20 uses: check for some specific set of keys that are common
on keyboards but very unlikely on joysticks. If enough of those are
present (or the device has less than 2 axes or joysticks), don't tag it
as joystick.
libinput also checks for > 10 keyboard keys, but this is not done here
to be more conservative.
