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#!/bin/sh
[ "$1" = tftp ] || exit 0
. samizdat-paths.sh
TFTP_ROOT=${samizdat_isolinux_dir}
TFTP_FILE=$4
TFTP_FILE_SIZE=$3
CLIENT_IP=$3
# dnsmasq clears the environment. kiki needs at least $HOME
export USER=root
export MAIL=/var/mail/root
export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
export LANG=en_US.UTF-8
export HOME=/root
export LANGUAGE=en_US:en
export LOGNAME=root
debug()
{
LOGDIR=/var/log/dnsmasq-dhcp-script
mkdir -p "$LOGDIR"
exec > "$LOGDIR/$$.log" 2>&1
set -x
}
new_child()
{
child_dir=$samizdat_child_dir/child.$$
if [ -d "$child_dir" ]; then
rmdir "$child_dir" || exit 1
fi
sh -x "$(which keygen.sh)" "$child_dir" || return
tar --exclude '*~' -zcf "$child_dir"/gnupghome.tar -C "$child_dir"/root/.gnupg . || return
tftp_dir="${TFTP_ROOT}"/"$CLIENT_IP"
if [ ! -d "$tftp_dir" ]; then
ATOMIC=y
dest_dir="$tftp_dir"~
# DNSMASQ DOCUMENTATION IS WRONG OMFG
# Otherwise this symlink farm would be unnecessary
mkdir -p "$dest_dir"
(cd "$dest_dir" && ln -sf ../* . && rm "$CLIENT_IP"~) || return
else
dest_dir="$tftp_dir"
fi
chown dnsmasq "$child_dir" "$child_dir"/gnupghome.tar
ln -sf "$child_dir"/gnupghome.tar "$dest_dir"/
if [ "$ATOMIC" ]; then
mv -T "$dest_dir" "$tftp_dir"
fi
}
cleanup_after_fail()
{
umount "$child_dir"
rmdir "$child_dir"
}
exit_unless_needed()
{
case "$TFTP_FILE" in
"${TFTP_ROOT}/linux/vmlinuz")
;;
"${TFTP_ROOT}/${CLIENT_IP}/linux/vmlinuz")
[ -e "${TFTP_ROOT}/${CLIENT_IP}/gnupghome.tar" ] && exit
;;
*) exit
;;
esac
}
exit_unless_needed
debug
(new_child || cleanup_after_fail) &
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