Add support for a rescue (recovery) mode from kernel cmdline

This patch adds a rescue (revovery) mode to Finit.  Simply add `rescue`
to the kernel cmdline at boot and the following steps at bootstrap will
be skipped:

- Load of services/run/task/etc in /etc/finit.conf + /etc/finit.d/*.conf
- fsck of filesystems in /etc/fstab
- Remount of / to read-write
- Mount of all filesystems in /etc/fstab
- swapon
- A few plugin hooks:
  - HOOK_ROOTFS_UP
  - HOOK_MOUNT_ERROR
  - HOOK_BASEFS_UP
- `runparts DIR`
- /etc/rc.local

Instead of loading /etc/finit.conf and /etc/finit.d/*.conf Finit loads
the file /lib/finit/rescue.conf, which can be overridden by the operator
if needed.  If this file is removed (or lost), Finit falls back to start
a simple root shell, without any login.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

src/Makefile.am

@@ -58,6 +58,7 @@ REBOOT_LNKS        = shutdown halt poweroff suspend
 
 # Hook in install to add finit and reboot symlink(s)
 install-exec-hook:
+	@$(INSTALL_DATA) $(srcdir)/rescue.conf $(DESTDIR)$(pkglibdir)
 	@for file in $(INIT_LNKS); do				\
 		lnk=$(DESTDIR)$(sbindir)/$$file;		\
 		if [ -e $$lnk ]; then				\
@@ -80,6 +81,7 @@ install-exec-hook:
 	fi
 
 uninstall-hook:
+	@$(RM) $(DESTDIR)$(pkglibdir)/rescue.conf
 	@for file in $(INIT_LNKS); do				\
 		lnk=`readlink $(DESTDIR)$(sbindir)/$$file`;	\
 		if [ "$$lnk" != "finit" ]; then			\