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#!/bin/sh
set -e
[ $# -ge 1 ] || {
echo "Usage: uchroot USER [CMD] [ARG].." >&2
echo "Configuration has to be passed trough envrionment."
echo " ROOT: path to directory to chroot in"
echo " ARCH: optional target architecture (if qemu should be used)"
echo " MOUNT: pairs of two paths separated by colon (LOCAL:INROOT)"
exit 1
}
if [ "$(id -u)" != "0" ]; then
exec uroot "$0" "$@"
fi
###############################################################
[ -n "$ROOT" ] || {
echo "Variable ROOT has to be defined in environment."
exit 1
}
USR="${1:-root}"
shift
[ $# -lt 1 ] && CMD="" || {
CMD="-c \"$1\""
shift
}
[ -d "$ROOT" ] || {
echo "There is no such directory: $ROOT" >&2
exit 1
}
[ -d "$ROOT/proc" -a -d "$ROOT/dev" -a -d "$ROOT/sys" ] || {
echo "Root seems to not contain valid rootfs: $ROOT" >&2
exit 1
}
EXECUTOR=
mount --rbind "$ROOT" "$ROOT"
mount -t proc none "$ROOT/proc"
mount --rbind /dev "$ROOT/dev"
mount --rbind /sys "$ROOT/sys"
while IFS=: read src target; do
[ -n "$src" -a -n "$target" ] || continue
mount --rbind "$src" "$ROOT/$target"
done <<<"$MOUNT"
cp -f /etc/resolv.conf "$ROOT/etc/resolv.conf"
cp -f /etc/hosts "$ROOT/etc/hosts"
if [ -n "$ARCH" -a "$ARCH" != "$(arch)" ]; then
cp -f "$(which "qemu-$ARCH")" "$ROOT/qemu"
EXECUTOR=/qemu
fi
exec chroot "$ROOT" $EXECUTOR /bin/sh -c \
". /etc/profile && exec su -l $USR $CMD \"\$@\"" -- "$@"
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