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.

The kernel's PID namespaces support reboot(2) just fine, so let's make
use of it if possible.

The kernel implicitly does sync() anyway, hence there is no need to do
that in userspace explicitly. This makes the "-n" switch to halt(8) a
noop.

Since RTCs are hardware devices and are very much shared resources we
should avoid to provide them in each container.

This splits the JSON output mode into different modes: json and
json-pretty. The former printing one entry per line, the latter showing
JSON objects nicely indented and in multiple lines to make it easier to
read for humans.

path-util: in path_is_mount_point() fall back to the classic stat() test if fs does not support name_to_handle_at()