87 lines
1.7 KiB
Bash
87 lines
1.7 KiB
Bash
#!/bin/sh
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# Copyright (C) 2006-2013 OpenWrt.org
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# Copyright (C) 2010 Vertical Communications
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boot_hook_splice_start() {
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export -n PI_HOOK_SPLICE=1
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}
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boot_hook_splice_finish() {
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local hook
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for hook in $PI_STACK_LIST; do
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local v; eval "v=\${${hook}_splice:+\$${hook}_splice }$hook"
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export -n "${hook}=${v% }"
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export -n "${hook}_splice="
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done
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export -n PI_HOOK_SPLICE=
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}
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boot_hook_init() {
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local hook="${1}_hook"
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export -n "PI_STACK_LIST=${PI_STACK_LIST:+$PI_STACK_LIST }$hook"
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export -n "$hook="
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}
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boot_hook_add() {
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local hook="${1}_hook${PI_HOOK_SPLICE:+_splice}"
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local func="${2}"
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[ -n "$func" ] && {
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local v; eval "v=\$$hook"
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export -n "$hook=${v:+$v }$func"
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}
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}
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boot_hook_shift() {
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local hook="${1}_hook"
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local rvar="${2}"
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local v; eval "v=\$$hook"
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[ -n "$v" ] && {
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local first="${v%% *}"
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[ "$v" != "${v#* }" ] && \
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export -n "$hook=${v#* }" || \
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export -n "$hook="
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export -n "$rvar=$first"
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return 0
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}
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return 1
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}
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boot_run_hook() {
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local hook="$1"
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local func
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while boot_hook_shift "$hook" func; do
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local ran; eval "ran=\$PI_RAN_$func"
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[ -n "$ran" ] || {
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export -n "PI_RAN_$func=1"
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$func "$1" "$2"
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}
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done
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}
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pivot() { # <new_root> <old_root>
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/bin/mount -o noatime,move /proc $1/proc && \
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pivot_root $1 $1$2 && {
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/bin/mount -o noatime,move $2/dev /dev
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/bin/mount -o noatime,move $2/tmp /tmp
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/bin/mount -o noatime,move $2/sys /sys 2>&-
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/bin/mount -o noatime,move $2/overlay /overlay 2>&-
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return 0
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}
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}
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fopivot() { # <rw_root> <ro_root> <dupe?>
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/bin/mount -o noatime,lowerdir=/,upperdir=$1 -t overlayfs "overlayfs:$1" /mnt
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pivot /mnt $2
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}
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ramoverlay() {
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mkdir -p /tmp/root
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/bin/mount -t tmpfs -o noatime,mode=0755 root /tmp/root
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fopivot /tmp/root /rom 1
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}
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