/mandos/trunk

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#!/bin/sh -e
# 
# This script will run in the initrd environment at boot and edit
# /conf/conf.d/cryptroot to set /lib/mandos/plugin-runner as keyscript
# when no other keyscript is set, before cryptsetup.
# 

# This script should be installed as
# "/usr/share/initramfs-tools/scripts/local-top/mandos" which will
# eventually be "/scripts/local-top/mandos" in the initrd.img file.

# No initramfs pre-requirements; we must instead run BEFORE cryptroot.
# This is not a problem, since cryptroot forces itself to run LAST.
PREREQ=""
prereqs()
{
     echo "$PREREQ"
}

case $1 in
prereqs)
     prereqs
     exit 0
     ;;
esac

chmod a=rwxt /tmp

test -w /conf/conf.d/cryptroot

# Do not replace cryptroot file unless we need to.
replace_cryptroot=no

# Our keyscript
mandos=/lib/mandos/plugin-runner

# parse /conf/conf.d/cryptroot.  Format:
# target=sda2_crypt,source=/dev/sda2,key=none,keyscript=/foo/bar/baz
exec 3>/conf/conf.d/cryptroot.mandos
while read options; do
    newopts=""
    # Split option line on commas
    old_ifs="$IFS"
    IFS="$IFS,"
    for opt in $options; do
	# Find the keyscript option, if any
	case "$opt" in
	    keyscript=*)
		keyscript="${opt#keyscript=}"
		newopts="$newopts,$opt"
		;;
	    "") : ;;
	    *)
		newopts="$newopts,$opt"
		;;
	esac
    done
    IFS="$old_ifs"
    unset old_ifs
    # If there was no keyscript option, add one.
    if [ -z "$keyscript" ]; then
	replace_cryptroot=yes
	newopts="$newopts,keyscript=$mandos"
    fi
    newopts="${newopts#,}"
    echo "$newopts" >&3
done < /conf/conf.d/cryptroot
exec 3>&-

# If we need to, replace the old cryptroot file with the new file.
if [ "$replace_cryptroot" = yes ]; then
    mv /conf/conf.d/cryptroot /conf/conf.d/cryptroot.mandos-old
    mv /conf/conf.d/cryptroot.mandos /conf/conf.d/cryptroot
else
    rm /conf/conf.d/cryptroot.mandos
fi