stages: add org.osbuild.pacman.mirrorlist.conf

Stage for configuring the pacman mirrorlist file.

stages/org.osbuild.pacman.mirrorlist.conf

@@ -0,0 +1,47 @@
+#!/usr/bin/python3
+"""
+configure pacman's mirrorlist
+"""
+import os
+import pathlib
+import sys
+
+import osbuild.api
+
+
+SCHEMA = """
+"additionalProperties": false,
+"properties": {
+  "filename": {
+    "type": "string",
+    "default": "/etc/pacman.d/mirrorlist"
+  },
+  "mirrors": {
+    "type": "array",
+    "description": "Mirror locations for pacman",
+    "items": {
+      "type": "string",
+      "examples": ["https://archlinux.org/$repo/os/$arch"]
+    }
+  }
+}
+"""
+
+
+def main(tree, options):
+    filename = options.get("filename", "/etc/pacman.d/mirrorlist").lstrip("/")
+    mirrors = options.get("mirrors", [])
+    filepath = pathlib.Path(filename)
+
+    os.makedirs(os.path.join(tree, *filepath.parts[:-1]), exist_ok=True)
+    mirrorpath = os.path.join(tree, *filepath.parts)
+    with open(mirrorpath, "w", encoding="utf-8") as cfgfile:
+        cfgfile.write("\n".join(f"Server = {m}\n" for m in mirrors))
+
+    return 0
+
+
+if __name__ == '__main__':
+    args = osbuild.api.arguments()
+    r = main(args["tree"], args["options"])
+    sys.exit(r)