Configurable config file path

lvmsnapshot.py

@@ -46,8 +46,9 @@ class Config:
     periods = {}
 
     @staticmethod
-    def load():
+    def load(config_path=None):
         import toml
+        if config_path is None:
             config_path = "config.toml"
             global_config_path = "/etc/lvm-snapshot.toml"
             ENV_VAR = "LVM_SNAPSHOT_CONFIG"
@@ -429,7 +430,8 @@ operations = {
 def main():
     import argparse
     parser = argparse.ArgumentParser(description="Manage snapshots of thin LVM volumes")
-    parser.add_argument("command", choices=["list", "update", "mount", "unmount"], default="list")
+    parser.add_argument("command", choices=["list", "update", "mount", "unmount"], default="list", nargs="?")
+    parser.add_argument("--config", help="path to config file", required=False)
     parser.add_argument("--verbose", "-v", action="count", help="do not redirect the command output to /dev/null")
     args = parser.parse_args()
     loglevels = {
@@ -440,7 +442,7 @@ def main():
     }
     loglevel = loglevels[min(3, max(0, args.verbose or 0))]
     logging.basicConfig(level=loglevel)
-    Config.parse(Config.load())
+    Config.parse(Config.load(args.config))
 
     operations[args.command]()