ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/package/base-files/files/lib/functions/preinit.sh b/package/base-files/files/lib/functions/preinit.sh
new file mode 100644
index 0000000..591e810
--- /dev/null
+++ b/package/base-files/files/lib/functions/preinit.sh
@@ -0,0 +1,87 @@
+# Copyright (C) 2006-2013 OpenWrt.org
+# Copyright (C) 2010 Vertical Communications
+
+boot_hook_splice_start() {
+ export -n PI_HOOK_SPLICE=1
+}
+
+boot_hook_splice_finish() {
+ local hook
+ for hook in $PI_STACK_LIST; do
+ local v; eval "v=\${${hook}_splice:+\$${hook}_splice }$hook"
+ export -n "${hook}=${v% }"
+ export -n "${hook}_splice="
+ done
+ export -n PI_HOOK_SPLICE=
+}
+
+boot_hook_init() {
+ local hook="${1}_hook"
+ export -n "PI_STACK_LIST=${PI_STACK_LIST:+$PI_STACK_LIST }$hook"
+ export -n "$hook="
+}
+
+boot_hook_add() {
+ local hook="${1}_hook${PI_HOOK_SPLICE:+_splice}"
+ local func="${2}"
+
+ [ -n "$func" ] && {
+ local v; eval "v=\$$hook"
+ export -n "$hook=${v:+$v }$func"
+ }
+}
+
+boot_hook_shift() {
+ local hook="${1}_hook"
+ local rvar="${2}"
+
+ local v; eval "v=\$$hook"
+ [ -n "$v" ] && {
+ local first="${v%% *}"
+
+ [ "$v" != "${v#* }" ] && \
+ export -n "$hook=${v#* }" || \
+ export -n "$hook="
+
+ export -n "$rvar=$first"
+ return 0
+ }
+
+ return 1
+}
+
+boot_run_hook() {
+ local hook="$1"
+ local func
+
+ while boot_hook_shift "$hook" func; do
+ local ran; eval "ran=\$PI_RAN_$func"
+ [ -n "$ran" ] || {
+ export -n "PI_RAN_$func=1"
+ $func "$1" "$2"
+ }
+ done
+}
+
+pivot() { # <new_root> <old_root>
+ /bin/mount -o noatime,move /proc $1/proc && \
+ pivot_root $1 $1$2 && {
+ /bin/mount -o noatime,move $2/dev /dev
+ /bin/mount -o noatime,move $2/tmp /tmp
+ /bin/mount -o noatime,move $2/sys /sys 2>&-
+ /bin/mount -o noatime,move $2/overlay /overlay 2>&-
+ return 0
+ }
+}
+
+fopivot() { # <rw_root> <work_dir> <ro_root> <dupe?>
+ /bin/mount -o noatime,lowerdir=/,upperdir=$1,workdir=$2 -t overlay "overlayfs:$1" /mnt
+ pivot /mnt $3
+}
+
+ramoverlay() {
+ mkdir -p /tmp/root
+ /bin/mount -t tmpfs -o noatime,mode=0755 root /tmp/root
+ mkdir -p /tmp/root/root /tmp/root/work
+ fopivot /tmp/root/root /tmp/root/work /rom 1
+}