If we operate relative some explicit rootfs the reason for the sync()ing
is not really given, we are not really acting as a milestone at boot,
but "offline".
This allows using CHASE_MKDIR_0755 without CHASE_NONEXISTENT or
CHASE_PARENT, so that it will create the final component of the path
too should it be missing.
This is really useful as a mkdir_p() replacement that returns an fd to
the final component, and knows how to operate relative to a root fs.
Kinda reverts 4ea0bcb922 (which only
refused the flags combination which didn't work, instead of making it
work, which is what this commit does.)
This also corrects behaviour if CHASE_MKDIR_0755 is used in one more
way: we'll now always open the dir as O_PATH. This is generally the
better idea, but matters in particular once with allow using
CHASE_MKDIR_0755 to create the final component: we should uniformly
return an O_PATH dir that must be converted to a proper fd first before
using it.
Split out of #36010.
This simply enables the "usrquota" mount option on the two dirs if they
are backed by tmpfs.
#36010 contains a test that actually verifies that the mount option does
its thing.
Given we have the generic interface, let's hook it up everywhere.
This doesnt bother with the Reload() call usually, since that's more
involved, but hooks up the other relevant functions where applicable.
It's just so useful being able to retrieve the current env block from
our services. Add a concept for that. It's really simple, and dumb.
In many ways it's like /proc/$PID/environ, but shows the actual
environ[] array visible to the app, not just some memory that was
originally used for the env block passed in, but might have been rearranged.
Let's give the user control on how to handle JSON "null" assignments of
the log level. As one of three cases: as failure, as LOG_NULL (i.e. to
turn off logging) or as LOG_INFO (as our usual default log level).
Let's then use that in the generic SetLogLevel() call, so that callers
can use it to explicitly turn off logging in a service.
Note that this was (probably accidentally) already implemented, except
that the introspection enforcement blocked it. Let's clean this up and
make this officially a thing, since it's generally useful to turn off
logging I think.
Lennart Poettering
Daan De Meyer
Luca Boccassi
Yu Watanabe
Hendrik Wolff
nl6720