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#!/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
}
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