[PATCH 33/50] We now have a simple hook structure and 3 defined hook points.

Any script placed in /pre-udev will be sourced just before udev starts
device scanning and loading.

Any script placed in /pre-mount will be sourced just before we try to
mount a root filesystem.

Any script placed in /pre-pivot will be sourced just before we switch to the
new root filesystem.

These hooks should be the minimum needed to add back plymouth and deal with
more advanced filesysem mounting needs (multipath, iscsi, nfs, nbd, etc.)

Makefile

@@ -4,6 +4,9 @@ all:
 install:
 	mkdir -p $(DESTDIR)/usr/libexec/dracut
 	mkdir -p $(DESTDIR)/sbin
+	mkdir -p $(DESTDIR)/usr/libexec/dracut/pre-mount
+	mkdir -p $(DESTDIR)/usr/libexec/dracut/pre-udev
+	mkdir -p $(DESTDIR)/usr/libexec/dracut/pre-pivot
 	install -m 0755 dracut $(DESTDIR)/sbin/dracut
 	install -m 0755 init $(DESTDIR)/usr/libexec/dracut/init
 	install -m 0755 switch_root $(DESTDIR)/usr/libexec/dracut/switch_root
@@ -11,7 +14,7 @@ install:
 	install -m 0755 echoer $(DESTDIR)/usr/libexec/dracut/echoer
 	mkdir $(DESTDIR)/usr/libexec/dracut/rules.d
 	for rule in rules.d/*.rules ; do install -m 0644 $$rule $(DESTDIR)/usr/libexec/dracut/rules.d ; done
-
+	for hooks in pre-*/* ; do install -m 0755 $$hook $(DESTDIR/usr/libexec/dracut ; done
 clean:
 	rm -f *~
 

dracut

@@ -110,6 +110,11 @@ fi
 cp $initfile "$initdir/init"
 cp $switchroot "$initdir/sbin/switch_root"
 cp $echoer "$initdir/echoer"
+for hookdir in $hookdirs; do
+    for hook in "$dsrc/$hookdir"/*; do
+	[[ -f $hook ]] && inst "$hook" "/$hookdir/${hook##*/}"
+    done
+done
 
 # and create some directory structure
 for d in etc proc sys sysroot dev/pts; do mkdir -p "$initdir/$d"; done

init

@@ -23,8 +23,8 @@ getarg() {
 
 source_all() {
     local f
-    [[ -d $1 ]] || return
+    [[ $1 &&  -d /$1 ]] || return
-    for f in "$d"/*; do; . "$f"; done
+    for f in "/$1"/*; do [[ -f $f ]] && . "$f"; done
 }
 
 echo "Starting initrd..."
@@ -51,6 +51,8 @@ mknod /dev/tty0 c 4 0
 mknod /dev/tty1 c 4 1
 mknod /dev/null c 1 3
 
+source_all pre-udev
+
 # start up udev and trigger cold plugs
 udevd --daemon
 udevadm trigger >/dev/null 2>&1
@@ -75,7 +77,7 @@ esac
 tries=0
 echo "Waiting up to 30 seconds for $root to become available"
 udevadm settle --timeout=30
-source_all /pre-mount
+source_all pre-mount
 
 echo "Trying to mount rootfs $root"
 [[ -e $root ]] || emergency_shell
@@ -91,16 +93,7 @@ mount --bind /dev $NEWROOT/dev
 mount -t proc /proc $NEWROOT/proc
 mount -t sysfs /sys $NEWROOT/sys
 
-# FIXME: load selinux policy.  this should really be done after we switchroot 
+source_all pre-pivot
-if [ -x $NEWROOT/usr/sbin/load_policy ]; then
-  chroot $NEWROOT /usr/sbin/load_policy -i
-  if (($? == 3)); then
-    echo "Initial SELinux policy load failed and enforcing mode requested."
-    echo "Not continuing"
-    sleep 100d
-    exit 1
-  fi
-fi
 
 # kill off udev
 kill $(pidof udevd)

pre-pivot/50selinux-loadpolicy

@@ -0,0 +1,10 @@
+#!/bin/bash
+# FIXME: load selinux policy.  this should really be done after we switchroot 
+[[ -x $NEWROOT/usr/sbin/load_policy ]] || return
+chroot $NEWROOT /usr/sbin/load_policy -i
+if (($? == 3)); then
+   echo "Initial SELinux policy load failed and enforcing mode requested."
+   echo "Not continuing"
+   sleep 100d
+   exit 1
+fi