Use effective artifact tag in update checks

src/bin/dosh-client.rs

@@ -4134,6 +4134,11 @@ fn update_binary_version_for_installer(local: &str, latest_tag: Option<&str>) ->
     }
 }
 
+fn effective_update_artifact_tag(local: &str, latest_tag: Option<&str>) -> Option<String> {
+    update_binary_version_for_installer(local, latest_tag)
+        .or_else(|| latest_tag.map(ToOwned::to_owned))
+}
+
 fn compare_dotted_versions(left: &str, right: &str) -> std::cmp::Ordering {
     let left = parse_comparable_version(left);
     let right = parse_comparable_version(right);
@@ -4299,13 +4304,15 @@ fn run_update(config: &dosh::config::ClientConfig, options: UpdateOptions) -> Re
         if let Some(latest_url) = latest_release_download_url(&repo, artifact) {
             let mut status = "missing";
             let mut display_url = latest_url.clone();
-            if let Some(tag_url) = latest_tag
+            if let Some(tag_url) =
+                effective_update_artifact_tag(local_version, latest_tag.as_deref())
                     .as_deref()
                     .and_then(|tag| release_tag_download_url(&repo, tag, artifact))
-                && url_reachable(&tag_url)?
             {
-                status = "available";
                 display_url = tag_url;
+                if url_reachable(&display_url)? {
+                    status = "available";
+                }
             } else if url_reachable(&latest_url)? {
                 status = "available";
             }
@@ -9556,28 +9563,28 @@ mod tests {
         PendingStreamOpen, PredictMode, Predictor, RESTART_STATUS_SCRIPT, RemoteForward,
         STARTUP_INPUT_HOLD, SshConfig, SshPathTokenContext, StartupGateMode, StatusAction,
         UpdateOptions, UpdateRole, auth_allows, cache_key, cache_server_prefix,
-        cleanup_stream_state, clear_cached_credentials, ensure_tui_safe_status_overlay,
-        expand_ssh_path_tokens, input_contains_focus_in, input_matches_escape,
-        is_local_status_target, is_resume_response_for_client, latest_release_download_url,
-        load_first_native_identity_with_prompt, native_proxy_udp_warning,
-        newest_client_trace_path_from, parse_dynamic_forward, parse_escape_key,
-        parse_local_forward, parse_remote_forward, parse_ssh_config, parse_trace_line,
-        parse_trace_options, parse_trace_report_options, parse_trace_summary, parse_update_options,
-        post_submit_hold_duration, queue_pending_user_input, queue_stale_pending_user_input,
-        raw_contains_host_table, recv_response_until, refresh_live_addr, release_tag_download_url,
-        release_tag_from_effective_url, release_version_from_tag, render_status_clear,
-        render_status_overlay, requested_env, resolved_startup_command, retire_stream_state,
-        retransmit_stream_opens, rewrite_forward_command, sanitize_trace_name,
-        selected_predict_mode, selected_udp_host, server_version_mismatch,
-        should_flush_terminal_input_after_contact, should_health_log_client_start,
-        should_hold_during_startup_gate, should_hold_post_submit_input,
-        should_reconnect_before_input_for_local_sleep, should_repaint_idle_terminal,
-        should_strip_unowned_terminal_reports, split_after_command_submit, split_trace_tokens,
-        ssh_command_target, ssh_config_uses_proxy, ssh_destination_host, ssh_username,
-        ssh_with_user, startup_command, status_ssh_target, strip_stale_mouse_reports,
-        strip_terminal_focus_reports, strip_unowned_terminal_reports, summarize_trace_file,
-        summarize_trace_file_with_mode, terminal_private_mode_transition, toml_bare_key_or_quoted,
-        top_trace_events, trace_report_warnings, unix_update_script,
+        cleanup_stream_state, clear_cached_credentials, effective_update_artifact_tag,
+        ensure_tui_safe_status_overlay, expand_ssh_path_tokens, input_contains_focus_in,
+        input_matches_escape, is_local_status_target, is_resume_response_for_client,
+        latest_release_download_url, load_first_native_identity_with_prompt,
+        native_proxy_udp_warning, newest_client_trace_path_from, parse_dynamic_forward,
+        parse_escape_key, parse_local_forward, parse_remote_forward, parse_ssh_config,
+        parse_trace_line, parse_trace_options, parse_trace_report_options, parse_trace_summary,
+        parse_update_options, post_submit_hold_duration, queue_pending_user_input,
+        queue_stale_pending_user_input, raw_contains_host_table, recv_response_until,
+        refresh_live_addr, release_tag_download_url, release_tag_from_effective_url,
+        release_version_from_tag, render_status_clear, render_status_overlay, requested_env,
+        resolved_startup_command, retire_stream_state, retransmit_stream_opens,
+        rewrite_forward_command, sanitize_trace_name, selected_predict_mode, selected_udp_host,
+        server_version_mismatch, should_flush_terminal_input_after_contact,
+        should_health_log_client_start, should_hold_during_startup_gate,
+        should_hold_post_submit_input, should_reconnect_before_input_for_local_sleep,
+        should_repaint_idle_terminal, should_strip_unowned_terminal_reports,
+        split_after_command_submit, split_trace_tokens, ssh_command_target, ssh_config_uses_proxy,
+        ssh_destination_host, ssh_username, ssh_with_user, startup_command, status_ssh_target,
+        strip_stale_mouse_reports, strip_terminal_focus_reports, strip_unowned_terminal_reports,
+        summarize_trace_file, summarize_trace_file_with_mode, terminal_private_mode_transition,
+        toml_bare_key_or_quoted, top_trace_events, trace_report_warnings, unix_update_script,
         update_binary_version_for_installer, update_installer_url, update_version_status,
         upsert_managed_block, valid_forward_host, vscode_safe_alias, wake_repaint_retry_deadline,
         windows_update_script,
@@ -11296,6 +11303,15 @@ mod tests {
             update_binary_version_for_installer("1.0.0-rc42", Some("v1.0.0")),
             None
         );
+        assert_eq!(
+            effective_update_artifact_tag("1.0.0-rc41", Some("v1.0.0-rc37")).as_deref(),
+            Some("v1.0.0-rc41")
+        );
+        assert_eq!(
+            effective_update_artifact_tag("1.0.0-rc41", Some("v1.0.0-rc42")).as_deref(),
+            Some("v1.0.0-rc42")
+        );
+        assert_eq!(effective_update_artifact_tag("1.0.0-rc41", None), None);
         let config = ClientConfig::default();
         let unix = unix_update_script(
             &config,