lvm2: update patch to rc files (thanks denis yantarev)

add readme and patch auto add/remove
renamed and updated patch rc.diff -> rc.diff

lvm2/README

@@ -0,0 +1,27 @@
+REQUIREMENTS:
+
+	Patched core/rc package.
+
+PRECAUTION:
+
+	Don't forget to run install scripts or patch rc manually
+	 with:
+
+	# patch -p 1 lvm2-rc.patch
+
+PRE-INSTALL:
+
+POST-INSTALL:
+
+	This patches rc scripts for LVM2 support.
+
+PRE-REMOVE:
+
+	This reverses the LVM2 rc scripts patch.
+
+POST-REMOVE:
+
+NOTES:
+
+	post-install and pre-remove will only patch if there is
+	 no errors on a patch dry run.

lvm2/lvm2-rc.patch

@@ -0,0 +1,29 @@
+diff -pruN pkg.orig/etc/rc pkg/etc/rc
+--- pkg.orig/etc/rc	2008-04-29 10:01:50.996260068 +1000
++++ pkg/etc/rc	2008-04-29 10:02:17.184261912 +1000
+@@ -13,6 +13,13 @@ echo "The system is coming up.  Please w
+ /bin/mount -n -t sysfs none /sys
+ /sbin/start_udev
+ 
++# Create device-mapper device nodes
++/sbin/dmsetup mknodes
++
++# Scan for LVM volume groups
++/sbin/vgscan --ignorelockingfailure
++/sbin/vgchange --ignorelockingfailure -a y
++
+ # Mount root read-only
+ /bin/mount -n -o remount,ro /
+ 
+diff -pruN pkg.orig/etc/rc.shutdown pkg/etc/rc.shutdown
+--- pkg.orig/etc/rc.shutdown	2008-04-29 10:01:50.996260068 +1000
++++ pkg/etc/rc.shutdown	2008-04-29 10:02:37.018264223 +1000
+@@ -43,6 +43,8 @@ fi
+ /sbin/swapoff -a
+ 
+ # Unmount file systems
++/bin/umount -a -r -t nosysfs,noproc
++/sbin/vgchange --ignorelockingfailure -a n
+ /bin/umount -a -r
+ 
+ # Remount root filesystem read-only

lvm2/post-install

@@ -0,0 +1,11 @@
+#!/usr/bin/env sh
+
+# dry run test
+/usr/bin/patch --dry-run -f -p 1 -i lvm2-rc.patch > /dev/null
+
+# patch if no errors
+if [ $? = 0 ]; then
+	/usr/bin/patch -p 1 -i lvm2-rc.patch
+fi
+
+# End of file

lvm2/pre-remove

@@ -0,0 +1,11 @@
+#!/usr/bin/env sh
+
+# dry run test
+/usr/bin/patch --dry-run -f -R -p 1 -i lvm2-rc.patch > /dev/null
+
+# reverse patch if no errors
+if [ $? = 0 ]; then
+	/usr/bin/patch -R -p 1 -i lvm2-rc.patch
+fi
+
+# End of file

lvm2/rc.diff

@@ -1,26 +0,0 @@
---- /etc/rc.orig
-+++ /etc/rc
-@@ -13,6 +13,13 @@
- /bin/mount -n -t sysfs none /sys
- /sbin/start_udev
- 
-+# Create device-mapper device nodes
-+/sbin/dmsetup mknodes
-+
-+# Scan for LVM volume groups
-+/sbin/vgscan --ignorelockingfailure
-+/sbin/vgchange --ignorelockingfailure -a y
-+
- # Mount root read-only
- /bin/mount -n -o remount,ro /
- 
---- /etc/rc.shutdown.orig
-+++ /etc/rc.shutdown
-@@ -44,6 +44,7 @@
- 
- # Unmount file systems
- /bin/umount -a -r
-+/sbin/vgchange -a n
- 
- # Remount root filesystem read-only
- /bin/mount -n -o remount,ro /