#!/bin/sh
# SPDX-License-Identifier: LGPL-2.1-or-later
set -eu

# Try to guess the build directory:
# we look for subdirectories of the parent directory that look like ninja build dirs.

if [ -n "${BUILD_DIR:=}" ]; then
    realpath "$BUILD_DIR"
    exit 0
fi

root="$(dirname "$(realpath "$0")")"

found=
for i in "$root"/../*/build.ninja; do
    c="$(dirname "$i")"
    [ -d "$c" ] || continue
    [ "$(basename "$c")" != mkosi.builddir ] || continue

    if [ -n "$found" ]; then
        echo "Found multiple candidates, specify build directory with \$BUILD_DIR" >&2
        exit 2
    fi
    found="$c"
done

if [ -z "$found" ]; then
    echo "Specify build directory with \$BUILD_DIR" >&2
    exit 1
fi

realpath "$found"