config: dashboard-url requires dashboard feature

1 files changed, 11 insertions, 1 deletions

diff --git a/src/config/mod.rs b/src/config/mod.rs
index a1011ee..628f0ff 100644
--- a/src/config/mod.rs
+++ b/src/config/mod.rs
@@ -247,7 +247,7 @@ pub(crate) const OPTIONS: &[OptionSpec] = &[
         Kind::Text,
         "URL",
         None,
-        "Where people reach this node's dashboard (http:// or https://, e.g. behind a reverse proxy). Published in the swarm's member list: the other nodes' dashboards open it on a double-click on this node.",
+        "Where people reach this node's dashboard (http:// or https://, e.g. behind a reverse proxy). Published in the swarm's member list: the other nodes' dashboards open it on a double-click on this node. A build without the dashboard feature warns and publishes none (removing one published before).",
     ),
     option(
         "keepalive",
@@ -1544,6 +1544,16 @@ fn resolve(merged: Layer, files: Vec<PathBuf>) -> Result<Loaded> {
     settings.alias = settings.alias.map(|alias| alias.trim().to_owned());
     settings.transports = settings.ordered_transports();
     settings.check().context("invalid configuration")?;
+    // No dashboard to be reached there: none is published (and one published before is
+    // removed, `swarm::members`).
+    if !cfg!(feature = "dashboard")
+        && let Some(url) = settings.dashboard_url.take()
+    {
+        warn!(
+            url = %url,
+            "dashboard-url is set, but this build has no dashboard (the dashboard feature); not publishing it"
+        );
+    }
     Ok(Loaded {
         settings,
         origins: merged