/lib/functions.sh: move preinit related functions to /lib/functions/preinit.sh

[openwrt/openwrt.git] / package / base-files / files / lib / functions / preinit.sh

diff --git a/package/base-files/files/lib/functions/preinit.sh b/package/base-files/files/lib/functions/preinit.sh
new file mode 100644 (file)
index 0000000..db1f298
--- /dev/null
+++ b/package/base-files/files/lib/functions/preinit.sh
@@ -0,0 +1,87 @@
+#!/bin/sh
+# 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> <ro_root> <dupe?>
+       /bin/mount -o noatime,lowerdir=/,upperdir=$1 -t overlayfs "overlayfs:$1" /mnt
+       pivot /mnt $2
+}
+
+ramoverlay() {
+       mkdir -p /tmp/root
+       /bin/mount -t tmpfs -o noatime,mode=0755 root /tmp/root
+       fopivot /tmp/root /rom 1
+}