api/ui: datastore: allow to set simple comment

for now forbid all control characters[0] in the comment value, the
section config writer cannot cope with newlines in the value, it
writes them out literally, allowing "injection" or breaking the whole
config.

In the webinterface use also a textfield, not a textarea.

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

src/api2/config/datastore.rs

@@ -32,6 +32,7 @@ pub const POST: ApiMethod = ApiMethod::new(
     &ObjectSchema::new(
         "Create new datastore.",
         &[
+            ("comment", true, &StringSchema::new("Comment for this Datastore").schema()),
             ("name", false, &DATASTORE_SCHEMA),
             ("path", false, &StringSchema::new("Directory path. The directory path is created if it does not already exist.").schema()),
         ],
@@ -54,6 +55,10 @@ fn create_datastore(
         bail!("datastore '{}' already exists.", name);
     }
 
+    if param["comment"].as_str().unwrap().find(|c: char| c.is_control()) != None {
+        bail!("comment must not contain control characters!");
+    }
+
     let path: PathBuf = param["path"].as_str().unwrap().into();
     let backup_user = crate::backup::backup_user()?;
     let _store = ChunkStore::create(
@@ -65,7 +70,8 @@ fn create_datastore(
     )?;
 
     let datastore = json!({
-        "path": param["path"]
+        "path": param["path"],
+        "comment": param["comment"],
     });
 
     config.set_data(name, "datastore", datastore);