1 files changed, 33 insertions, 0 deletions
diff --git a/tools/find-build-dir.sh b/tools/find-build-dir.sh
new file mode 100755
index 0000000..79a79fc
--- /dev/null
+++ b/tools/find-build-dir.sh
@@ -0,0 +1,33 @@
+#!/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"