#!/bin/sh
# Copyright © 2011 Julian Andres Klode <jak@debian.org>
#
# schroot is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# schroot is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see
# <http://www.gnu.org/licenses/>.
#
#####################################################################

set -e

. "$SETUP_DATA_DIR/common-data"
. "$SETUP_DATA_DIR/common-functions"
. "$SETUP_DATA_DIR/common-config"


if [ "$STAGE" != "setup-start" ] && \
   [ "$STAGE" != "setup-stop"  ] && \
   [ "$STAGE" != "setup-recover" ]; then
    exit 0
elif ! which update-binfmts > /dev/null 2>&1; then
    info "Missing update-binfmts; not enabling binfmt support"
    exit 0
fi

shell="${CHROOT_PATH}/bin/sh"

for emulator in $(update-binfmts --find "$shell"); do
    dst="${CHROOT_PATH}$emulator"
    if [ ! -e "$emulator" ]; then
	info "Missing emulator: $emulator; not enabling binfmt support"
    elif [ ! -e "$dst" ]; then
	## [mdw] don't bind over an existing qemu.  Two things go wrong:
	## firstly, and more obviously, this forces the use of the host qemu,
	## which may be too old to run more bleeding-edge code; and secondly,
	## if the chroot's emulator is a symlink to a file in the host
	## filesystem to be bound into the chroot, then this bind mount is
	## never cleaned up.  It's just a bad idea.
	touch "$dst"
	mount --bind "$emulator" "$dst"
	mount -o remount,ro,bind "$dst"
    fi
done