Add helper to check config whether to abort the hook failing

This helper can be used to check the configuration of the hook whether
it should abort if the repository cannot be opened.

libimagstorestdhook/src/vcs/git/config.rs

@@ -13,3 +13,22 @@ pub fn commit_message(config: &Value, action: StoreAction) -> Option<String> {
         unimplemented!()
     }
 }
+
+pub fn abort_on_repo_init_err(cfg: Option<&Value>) -> bool {
+    cfg.map(|cfg| {
+        match cfg.lookup("abort_on_repo_init_failure") {
+            Some(&Value::Boolean(b)) => b,
+            Some(_) => {
+                warn!("Configuration error, 'abort_on_repo_init_failure' must be a Boolean (true|false).");
+                warn!("Assuming 'true' now.");
+                true
+            },
+            None => {
+                debug!("No key `abort_on_repo_init_failure' - Assuming 'true'");
+                true
+            },
+        }
+    })
+    .unwrap_or(false)
+}
+