api2/node/time.rs: implement set timezone

src/api2/node/time.rs

@@ -28,13 +28,40 @@ fn get_time(_param: Value, _info: &ApiMethod) -> Result<Value, Error> {
     }))
 }
 
+extern "C"  { fn tzset(); }
+
+// Note:: this needs root rights ??
+
+fn set_timezone(param: Value, _info: &ApiMethod) -> Result<Value, Error> {
+
+    let timezone = tools::required_string_param(&param, "timezone")?;
+
+    let path = std::path::PathBuf::from(format!("/usr/share/zoneinfo/{}", timezone));
+
+    if !path.exists() {
+        bail!("No such timezone.");
+    }
+
+    tools::file_set_contents("/etc/timezone", timezone.as_bytes(), None);
+
+    let _ = std::fs::remove_file("/etc/localtime");
+
+    use std::os::unix::fs::symlink;
+    symlink(path, "/etc/localtime")?;
+
+    unsafe { tzset() };
+
+    Ok(Value::Null)
+}
+
 pub fn router() -> Router {
 
     let route = Router::new()
         .get(
             ApiMethod::new(
-                get_time, ObjectSchema::new("Read server time and time zone settings."))
-                .returns(
+                get_time,
+                ObjectSchema::new("Read server time and time zone settings.")
+            ).returns(
                 ObjectSchema::new("Returns server time and timezone.")
                     .required("timezone", StringSchema::new("Time zone"))
                     .required("time", IntegerSchema::new("Seconds since 1970-01-01 00:00:00 UTC.")
@@ -42,6 +69,13 @@ pub fn router() -> Router {
                     .required("localtime", IntegerSchema::new("Seconds since 1970-01-01 00:00:00 UTC. (local time)")
                               .minimum(1297163644))
             )
+        )
+        .put(
+            ApiMethod::new(
+                set_timezone,
+                ObjectSchema::new("Set time zone.")
+                    .required("timezone", StringSchema::new("Time zone. The file '/usr/share/zoneinfo/zone.tab' contains the list of valid names."))
+            )
         );