units: enable automount units only if the kernel supports them

TODO

@@ -31,6 +31,11 @@ F15 External:
 
 Features:
 
+* unset cgroup agents on shutdown
+
+* Add ConditionPathExists= checks to binfmt automount units, to avoid
+  installing the automount point if the directory does not exist.
+
 * drop /.readahead on bigger upgrades with yum
 
 * add inode stat() check to readahead to suppress preloading changed files
@@ -62,6 +67,7 @@ Features:
   - status update
   - you are a distro: why switch?
   - /etc/sysconfig and /etc/default
+  - how to write socket activated services
 
 * maybe add tiny dbus services similar to hostnamed for locale and wallclock/timezone?
 

units/proc-sys-fs-binfmt_misc.automount

@@ -9,6 +9,7 @@
 Description=Arbitrary Executable File Formats File System Automount Point
 DefaultDependencies=no
 Before=sysinit.target
+ConditionPathExists=/proc/sys/fs/binfmt_misc
 
 [Automount]
 Where=/proc/sys/fs/binfmt_misc

units/sys-kernel-debug.automount

@@ -9,6 +9,7 @@
 Description=Debug File System Automount Point
 DefaultDependencies=no
 Before=sysinit.target
+ConditionPathExists=/sys/kernel/debug
 
 [Automount]
 Where=/sys/kernel/debug

units/sys-kernel-security.automount

@@ -9,6 +9,7 @@
 Description=Security File System Automount Point
 DefaultDependencies=no
 Before=sysinit.target
+ConditionPathExists=/sys/kernel/security
 
 [Automount]
 Where=/sys/kernel/security