From 80bda1f3e5acac9067ae258e98ccc773efcf88c0 Mon Sep 17 00:00:00 2001
From: nbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73>
Date: Thu, 11 Aug 2011 20:32:57 +0000
Subject: [PATCH] initramfs: allow preinit to enable switching from initramfs
to tmpfs to allow overlayfs to be mounted on top of it
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@27960 3c298f89-4303-0410-b956-a3cf2f4a3e73
---
target/linux/generic/base-files/init | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/target/linux/generic/base-files/init b/target/linux/generic/base-files/init
index 9e8ba7c5e..5e4fbaec3 100755
--- a/target/linux/generic/base-files/init
+++ b/target/linux/generic/base-files/init
@@ -8,6 +8,19 @@ INITRAMFS=1
set_state init
echo "- init -"
+[ -n "$SWITCH_ROOT_TMPFS" ] && {
+ mount none /mnt -t tmpfs
+ ( cd /; find -xdev -type d ) | ( cd /mnt; xargs mkdir -p )
+ find / \! -type d -xdev | tar -cT /proc/self/fd/0 | tar -xC /mnt
+ mkdir /mnt/proc /mnt/dev /mnt/tmp /mnt/sys
+ mount -o move /proc /mnt/proc
+ mount -o move /dev /mnt/dev
+ mount -o move /tmp /mnt/tmp
+ mount -o move /sys /mnt/sys
+ rm -rf /proc /dev /tmp /sys
+ exec switch_root -c /dev/console /mnt /sbin/init
+}
+
# if we have no root parameter, just go to running from ramfs
[ -z $rootfs ] && {
export NOMOUNT="No Root"
--
2.20.1