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Break out the write logic into a separate function and simply use it as
a callback to glob_item.

This allows users to consolidate writes to sysfs with multiple similar
pathnames, e.g.

  w /sys/class/block/sd[a-z]/queue/read_ahead_kb - - - - 1024

This counts 'online sessions' in addition to 'active sessions' and 'sessions'.

In this context, an 'online session' covers all session in the 'active' state
in addition to the explicit 'online' state.

This provides an easy machanism to determin all relevant sessions easily
(i.e. those that are not 'closing') and adds new semantics to the sd-login.c
APIs sd_uid_get_sessions() and sd_uid_get_seats() where the require_active
argument can be supplied as a value 2 which only lists sessions which are
'online'.

This functionality should allow client applications to avoid deadlocks where
they only exit when all sessions are complete, such as a the problem where
PulseAudio will not exit until all sessions are gone, but in itself prevents
the session from exiting.

Prevsiouly the first active seat for a user would never be listed and
any subsequent seats would be concatenated on without any spaces.

PulseAudio for example will keep a client connection open provided
at least one session exists. However, if all sessions are currently
in the process of closing, we should flag that as the overall state
appropriately to better reflect what is happening.

Although this does better reflect the status for any given user, it does
not actually solve the overall problem of PulseAudio still finding some
sessions active and thus not exiting and therefore actually preventing
the session from closing. Future commits will extend sd-login to cope
with this situation.

https://bugzilla.redhat.com/show_bug.cgi?id=855863

otherwise the header contains the HEADER_INCOMPATIBLE_COMPRESSED
flag even though the data is not compressed and reading the journal
fails.

Call rm_rf_children_dangerous() recursively rather than falling back to
rm_rf_children(). This fixes a bug in systemd-tmpfiles.

The problem can easily be reproduced by:

  # mount /dev/sda1 /mnt
  # mkdir /mnt/test
  # echo "D /mnt" > /root/test.conf
  # systemd-tmpfiles --remove /root/test.conf
  Attempted to remove disk file system, and we can't allow that.
  rm_rf(/root/test): Operation not permitted
Reported-by: Lukas Jirkovsky <l.jirkovsky@gmail.com>

Use AC_PATH_PROG to try and locate the quotaon and quotacheck binaries,
falling back on hardcoded defaults when they can't be found.

https://bugs.freedesktop.org/show_bug.cgi?id=54448

Let's make sure libselinux doesn't spew to stderr

The code in the print_inhibitors function had an unintended
unconditional early exit, causing it to never print any
inhibitors.

condition.c makes use of sd_id128_get_machine() after all.

Spotted by Khem Raj.

Fixes instant hang on kernels that do not have CONFIG_FHANDLE enabled.

This was accidentally lost in commit 1640a0b6.