build: add script that lists private packages in repository

.repo/list-private

@@ -0,0 +1,29 @@
+#!/usr/bin/python
+
+# Python version of the following shell script:
+# find . -maxdepth 1 \
+#    -type d \
+#    -not -exec test -e "{}/.git" ';' \
+#    -not -path "*/\.*" \
+#    -print \
+#    | sed "s/\.\///g" \
+#    | sort
+
+import os
+
+forks = []
+
+for item in os.listdir("."):
+    # skip hidden directories, files, and submodules
+    if (
+        not item.startswith(".")
+        and os.path.isdir(item)
+        and not os.path.isfile(f"{item}/.git")
+    ):
+        forks.append(item)
+
+# sort alphabetically
+forks.sort()
+
+for fork in forks:
+    print(fork)

Makefile

@@ -48,3 +48,7 @@ help: ## Display this help
 rewrite: ## Rewrite .gitmodules
 	@.repo/rewrite-gitmodules
 
+.PHONY: list-private-packages
+list-private: ## List private packages in repository
+	@.repo/list-private
+