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64 lines
1.6 KiB
Bash
64 lines
1.6 KiB
Bash
#!/bin/sh
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# Copyright (C) 2010 Daniel Dickinson
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# This is free software, licensed under the GNU General Public License v2.
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# See /LICENSE for more information.
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check_set_md5sum() {
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local er_md5sum_file
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er_md5sum_file="${ER_OVERLAY_PREFIX}/.extroot.md5sum"
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local er_disabled
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if [ "${ER_OVERLAY_ROM}" = "/rom" ]; then
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er_disabled=/tmp/whole_root-disabled
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else
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er_disabled=/tmp${ER_OVERLAY_ROM}-disabled
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fi
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local er_extroot_md5sum
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if [ -f $md5sum_file ]; then
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er_extroot_md5sum="$(cat $er_md5sum_file)"
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fi
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local er_overlay_file="${ER_OVERLAY_ROM}/etc/extroot.md5sum"
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local er_extroot_overlay_md5sum
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if [ -f "$er_overlay_file" ]; then
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er_extroot_overlay_md5sum="$(cat $er_overlay_file)"
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fi
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if [ -z "$er_extroot_overlay_md5sum" ]; then
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cat $er_md5sum_file >$er_overlay_file
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elif [ "$er_extroot_overlay_md5sum" != "$er_extroot_md5sum" ]; then
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pi_extroot_mount_success="false"
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mkdir -p $er_disabled
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mount --move ${ER_OVERLAY_ROM} $er_disabled
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fi
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}
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set_jffs_md5sum() {
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# We do this anytime block-extroot exists, even on the first boot with
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# no extroot defined.
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local er_md5sum_file
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er_md5sum_file="${ER_OVERLAY_PREFIX}/.extroot.md5sum"
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local er_extroot_md5sum
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if [ -f $er_md5sum_file ]; then
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er_extroot_md5sum="$(cat $er_md5sum_file)"
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fi
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if [ -z "$er_extroot_md5sum" ]; then
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dd if=/dev/urandom count=32 bs=1k 2>/dev/null | md5sum | cut -f1 -d\ >$er_md5sum_file
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fi
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}
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determine_extroot_sysupgrade() {
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check_skip || set_jffs_md5sum
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check_skip || [ "$pi_extroot_mount_success" != "true" ] || {
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check_set_md5sum
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}
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}
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boot_hook_add preinit_mount_root determine_extroot_sysupgrade
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