Signed-off-by: Felix Fietkau <nbd@openwrt.org> SVN-Revision: 40404master
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#!/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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