Add first attempt at macOS dmg signing script.

cmake/sign_dmg.py

@@ -0,0 +1,68 @@
+import os
+import subprocess
+import tempfile
+import shutil
+import click
+
+# Requires click
+# pip install click
+
+# Example usage
+# python sign_dmg.py --input-dmg /path/to/your/input.dmg --output-dmg /path/to/your/output.dmg --signing-identity "Developer ID Application: YOUR_NAME (TEAM_ID)"
+
+# NOTE: This script assumes that you have the necessary Developer ID Application certificate in your
+# Keychain Access and that the codesign and hdiutil command-line tools are available on your system.
+
+@click.command()
+@click.option('--input-dmg', required=True, help='Path to the input DMG file.')
+@click.option('--output-dmg', required=True, help='Path to the output signed DMG file.')
+@click.option('--signing-identity', required=True, help='Signing identity (Developer ID Application).')
+def sign_dmg(input_dmg, output_dmg, signing_identity):
+    # Mount the input DMG
+    mount_point = tempfile.mkdtemp()
+    subprocess.run(['hdiutil', 'attach', input_dmg, '-mountpoint', mount_point])
+
+    # Copy the contents of the DMG to a temporary folder
+    temp_dir = tempfile.mkdtemp()
+    shutil.copytree(mount_point, os.path.join(temp_dir, 'contents'))
+    subprocess.run(['hdiutil', 'detach', mount_point])
+
+    # Find the .app bundle in the temporary folder
+    app_bundle = None
+    for item in os.listdir(os.path.join(temp_dir, 'contents')):
+        if item.endswith('.app'):
+            app_bundle = os.path.join(temp_dir, 'contents', item)
+            break
+
+    if not app_bundle:
+        print('No .app bundle found in the DMG.')
+        exit(1)
+
+    # Sign the .app bundle
+    subprocess.run([
+        'codesign',
+        '--deep',
+        '--force',
+        '--verbose',
+        '--options', 'runtime',
+        '--timestamp',
+        '--sign', signing_identity,
+        app_bundle
+    ])
+
+    # Create a new DMG containing the signed .app bundle
+    subprocess.run([
+        'hdiutil', 'create',
+        '-volname', os.path.splitext(os.path.basename(input_dmg))[0],
+        '-srcfolder', os.path.join(temp_dir, 'contents'),
+        '-ov',
+        '-format', 'UDZO',
+        output_dmg
+    ])
+
+    # Clean up temporary directories
+    shutil.rmtree(temp_dir)
+    shutil.rmtree(mount_point)
+
+if __name__ == '__main__':
+    sign_dmg()