[aur-dev][PATCH] config: allow reading both the proto file and the modified config

[Eli Schwartz]

This change allows aurweb configuration to be done via either:
- copying config.proto to config and modifying values
- creating a new config only containing modified values, next to a
  config.proto containing unmodified values

The motivation for this change is to enable ansible configuration by
storing only changed values, and deferring to config.proto otherwise.

If a config.proto file does not exist next to /etc/aurweb/config or
$AUR_CONFIG, it is ignored and *all* values are expected to live in the
modified config file.

Signed-off-by: Eli Schwartz <eschwartz at archlinux.org>
---
 aurweb/config.py           | 4 ++++
 web/lib/confparser.inc.php | 8 +++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/aurweb/config.py b/aurweb/config.py
index a52d942..c333c43 100644
--- a/aurweb/config.py
+++ b/aurweb/config.py
@@ -13,6 +13,10 @@ def _get_parser():
             path = os.environ.get('AUR_CONFIG')
         else:
             path = "/etc/aurweb/config"
+
+        if os.path.isfile(path + '.proto'):
+            with open(path + '.proto') as f:
+                _parser.read_file(f)
         _parser.read(path)
 
     return _parser
diff --git a/web/lib/confparser.inc.php b/web/lib/confparser.inc.php
index 499481d..2ed0108 100644
--- a/web/lib/confparser.inc.php
+++ b/web/lib/confparser.inc.php
@@ -8,11 +8,17 @@ function config_load() {
 		if (!$path) {
 			$path = "/etc/aurweb/config";
 		}
+		if (file_exists($path . ".proto")) {
+			$defaults = parse_ini_file($path . ".proto", true, INI_SCANNER_RAW);
+		} else {
+			$defaults = [];
+		}
 		if (file_exists($path)) {
-			$AUR_CONFIG = parse_ini_file($path, true, INI_SCANNER_RAW);
+			$config = parse_ini_file($path, true, INI_SCANNER_RAW);
 		} else {
 			die("aurweb config file not found");
 		}
+		$AUR_CONFIG = array_replace_recursive($defaults, $config)
 	}
 }
 
-- 
2.17.0