add util library

1 files changed, 29 insertions, 0 deletions

diff --git a/ec2init/util.py b/ec2init/util.py
new file mode 100644
index 00000000..8b36274e
--- /dev/null
+++ b/ec2init/util.py
@@ -0,0 +1,29 @@
+import yaml
+
+def read_conf(fname):
+	stream = file(fname)
+	conf = yaml.load(stream)
+	stream.close()
+	return conf
+
+def get_cfg_option_bool(yobj, key, default=False):
+    if not yobj.has_key(key): return default
+    val = yobj[key]
+    if yobj[key] in [ True, '1', 'on', 'yes', 'true']:
+        return True
+    return False
+
+def get_cfg_option_str(yobj, key, default=None):
+    if not yobj.has_key(key): return default
+    return yobj[key]
+
+# merge values from src into cand.
+# if src has a key, cand will not override
+def mergedict(src,cand):
+    if isinstance(src,dict) and isinstance(cand,dict):
+        for k,v in cand.iteritems():
+            if k not in src:
+                src[k] = v
+            else:
+                src[k] = merge(src[k],v)
+    return src