From 2d02801fbcd2fbdc7e7e95a1c10a9ef66cb1cbe4 Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Mon, 25 May 2020 08:45:37 +0300
Subject: feat: add -C option to read a default config file

---
 contractor | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/contractor b/contractor
index d5ef494..4b195d7 100755
--- a/contractor
+++ b/contractor
@@ -14,6 +14,10 @@ from subprocess import PIPE, STDOUT
 import yaml
 
 
+# Default configuration files.
+DEFAULT_CONFIGS = {os.path.expanduser("~/.config/contractor/config.yaml")}
+
+
 # The device in the manager VM for the workspace disk.
 WS_DEV = "/dev/vdb"
 
@@ -648,8 +652,34 @@ def setup_logging(args):
     logger.setLevel(logging.DEBUG)
 
 
+def load_default_config(args):
+    for filename in DEFAULT_CONFIGS:
+        if os.path.exists(filename):
+            load_config(filename, args)
+
+
+def load_config(filename, args):
+    with open(filename) as f:
+        config = yaml.safe_load(f)
+
+    keys = {
+        "manager_address": None,
+        "manager_port": None,
+        "manager_user": None,
+        "verbose": None,
+        "log": os.path.expanduser,
+    }
+    for key in keys:
+        if key in config:
+            func = keys[key]
+            if func is None:
+                func = lambda x: x
+            setattr(args, key, func(config[key]))
+
+
 def main():
     p = argparse.ArgumentParser()
+    p.add_argument("-C", "--use-default-config", action="store_true")
     p.add_argument("-v", "--verbose", action="store_true")
     p.add_argument("--log", help="log to a file")
 
@@ -678,6 +708,8 @@ def main():
     build.set_defaults(func=cmd_build, **manager_defaults)
 
     args = p.parse_args()
+    if args.use_default_config:
+        load_default_config(args)
     setup_logging(args)
     args.func(args)
 
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