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gnu-efi only knows two sizes for formatting integers: 32bit without
a length prefix and 64bit with 'l' prefix. Provide a PRI-style format
specifier for (U)INTN so that Print() can read the right amount of
bytes instead of printing garbage or worse.
Some drivers do not announce the diskseq change.
E.g. for md devices, the kernel increments the diskseq *after*
emitting a 'change' uevent when backing block devices are added to
a md device, and udevd does not receive no uevent which contains
the new diskseq.
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.
