build: Change how we create empty directories from Meson

Use install_emptydir() in Meson versions that support it, or a script
with similar invocation in versions that do not. This will make it
straightforward to migrate to install_emptydir() when we drop support
for Meson versions older than 0.60.0.

Signed-off-by: Simon McVittie <smcv@collabora.com>

2 files changed, 20 insertions, 0 deletions

diff --git a/tools/Makefile.am b/tools/Makefile.am
index e9c066ba..dee5f862 100644
--- a/tools/Makefile.am
+++ b/tools/Makefile.am
@@ -154,4 +154,5 @@ installcheck-local:
 
 EXTRA_DIST += build-timestamp.py
 EXTRA_DIST += meson.build
+EXTRA_DIST += meson-compat-install-emptydirs.py
 EXTRA_DIST += meson-compat-install-symlink.py
diff --git a/tools/meson-compat-install-emptydirs.py b/tools/meson-compat-install-emptydirs.py
new file mode 100755
index 00000000..0fc76287
--- /dev/null
+++ b/tools/meson-compat-install-emptydirs.py
@@ -0,0 +1,19 @@
+#!/usr/bin/env python3
+# Copyright 2022 Collabora Ltd.
+# SPDX-License-Identifier: MIT
+
+# Compatibility shim for installing empty directories with Meson < 0.60
+
+import os
+import sys
+from pathlib import Path
+
+for d in sys.argv[1].split(':'):
+    if os.path.isabs(d) and 'DESTDIR' in os.environ:
+        p = Path(d)
+        d = p.relative_to(p.anchor)
+        dest = os.path.join(os.environ['DESTDIR'], d)
+    else:
+        dest = os.path.join(os.environ['MESON_INSTALL_DESTDIR_PREFIX'], d)
+
+    os.makedirs(dest, mode=0o755, exist_ok=True)