The PAM module is called pam_elogind.so, not pam_systemd.so.
+Elogind and the running cgroup controller
+-----------------------------------------
+While 'configure' runs, it will detect which controller is in place.
+If no controller is in place, configure will determine, that elogind
+should be its own controller, which will be a very limited one.
+
+This approach shoudl generally work, but if you just have no cgroup
+controller in place, yet, or if you are currently switching to
+another one, this approach will fail.
+
+In this case you can do one of the two following things:
+
+ 1) Boot your system with the target init system and cgroup
+ controller, before configuring and building elogind, or
+ 2) Use the --with-cgroup-controller=name option.
+
+Example: If you plan to use openrc, but openrc has not yet booted
+ the machine, you can use
+ --with-cgroup-controller=openrc
+ to let elogind know that openrc will be the controller
+ in charge.
+
+However, if you set the controller at configure time to something
+different than is in place, elogind will not start until that
+controller is actively used as the primary controller.
+
License
-------
# ------------------------------------------------------------------------------
-# Find running cgroup controller
+# Let users set the cgroup controller to use, in case the target controller
+# isn't currently running the show.
+# Example: Gentoo Linux, user wants to switch from systemd to openrc+elogind,
+# and emerges elogind before having booted the machine with openrc.
+# See: https://github.com/elogind/elogind/issues/18
with_cgroupctrl=
-AS_IF( [test -f /proc/self/cgroup], [
- # If the init system is a cgroup controler, it will be position 1.
- # Secondary controllers, like cgmanager, do not work.
- with_cgroupctrl=`grep "^1:name=" /proc/self/cgroup | cut -d ':' -f 2`
- AS_IF( [test -z "$with_cgroupctrl"], [
- # Try to be our own cgroup controller
- with_cgroupctrl="name=elogind"
+AC_ARG_WITH([cgroup-controller],
+ AS_HELP_STRING([--with-cgroup-controller=name],
+ [Set the name of the cgroup controller to use.
+ Use this when the autodetection fails, or you plan to use your system with a different controller than the one in place now.
+ The value 'auto' (default) detects the running controller.
+ The values 'none' and 'elogind' will cause elogind to be its own (very limited) controller.
+ When elogind shall be its own controller, there *MUST NOT* be any other controller running!
+ Another popular controller would be 'openrc'.]),
+ [with_cgroupctrl=$withval],
+ [with_cgroupctrl=auto])
+
+# ------------------------------------------------------------------------------
+# Find running cgroup controller, if none was set
+AS_IF( [test "x$with_cgroupctrl" = "xauto"], [
+ AS_IF([test -f /proc/self/cgroup], [
+ # If the init system is a cgroup controler, it will be position 1.
+ # Secondary controllers, like cgmanager, do not work.
+ with_cgroupctrl=`grep "^1:name=" /proc/self/cgroup | \
+ sed -n 's/.*=//p' | sed -e 's/:.*$//'`
+ AS_IF( [test -z "$with_cgroupctrl"], [
+ # Try to be our own cgroup controller
+ with_cgroupctrl="elogind"
+ ])
+ ], [
+ # 'auto' but no cgroup fs is a problem.
+ with_cgroupctrl=""
])
])
-AS_IF( [test -z "$with_cgroupctrl"],
- AC_MSG_ERROR([No running cgroup controller found]))
+# If the user specified 'none', switch to 'elogind'.
+# 'none' is allowed, as this means "there is no controller now"
+AS_IF( [test "x$with_cgroupctrl" = "xnone"], [with_cgroupctrl=elogind])
+
+# If this was not possible, /proc/self/cgroup not mounted yet, and 'auto'
+# chosen, error out.
+AS_IF( [test -z "$with_cgroupctrl"],
+ AC_MSG_ERROR([No running cgroup controller found]), [
+ # Otherwise add the 'name=' prefix
+ with_cgroupctrl="name=$with_cgroupctrl"
+])
# ------------------------------------------------------------------------------
address_sanitizer_cflags=