block-extroot: Added md5sum to extroot and underlying root filesystem. This is used to ensure that the extroot is not mounted as the rootfs after a sysupgrade *until the user deals with the extroot).
SVN-Revision: 24230master
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581378f5cb
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68124370ac
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#!/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_extroot_md5sum |
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if [ -f $md5sum_file ]; then |
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er_extroot_md5sum="$(cat $er_md5sum_file)" |
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fi |
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local er_extroot_overlay_md5sum |
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if [ -f "/overlay/etc/extroot.md5sum" ]; then |
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er_extroot_overlay_md5sum="$(cat /overlay/.extroot.md5sum)" |
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fi |
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if [ -z "$er_extroot_overlay_md5sum" ]; then |
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cat $er_md5sum_file >/overlay/.extroot.md5sum |
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elif [ "$er_extroot_overlay_md5sum" != "$er_extroot_md5sum" ]; then |
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pi_extroot_mount_success="false" |
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mkdir -p /tmp/overlay-disabled |
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mount --move /overlay /tmp/overlay-disabled |
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fi |
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} |
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set_jffs_md5sum() { |
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# We do this anytime block-extroot exists, even on the first boot with |
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# no extroot defined. |
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local er_md5sum_file |
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er_md5sum_file="${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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