From a8f02b913d54c02ba18950a40bf13e7ebe311da1 Mon Sep 17 00:00:00 2001
From: Pim van Pelt <pim@ipng.ch>
Date: Fri, 17 Apr 2026 22:20:35 +0200
Subject: [PATCH] maglevt: show FQDN in header instead of config paths; v1.0.1

Replace the cfgPath field in the TUI header with the system's
fully-qualified hostname via gethostname + CNAME lookup, matching
what `hostname -f` produces.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
 Makefile            |  2 +-
 cmd/tester/main.go  | 20 +++++++++++++++++++-
 cmd/tester/model.go |  2 +-
 cmd/tester/view.go  |  2 +-
 4 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/Makefile b/Makefile
index 60694ae..4e31388 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,7 @@ FRONTEND_WEB_SRC := $(shell find cmd/frontend/web/src -type f 2>/dev/null) \
 FRONTEND_WEB_DIST := cmd/frontend/web/dist/index.html
 
 NATIVE_ARCH  := $(shell go env GOARCH)
-VERSION      := 1.0.0
+VERSION      := 1.0.1
 COMMIT_HASH  := $(shell git rev-parse --short HEAD 2>/dev/null || echo unknown)
 DATE         := $(shell date -u +%Y-%m-%dT%H:%M:%SZ)
 LDFLAGS      := -X '$(MODULE)/cmd.version=$(VERSION)' \
diff --git a/cmd/tester/main.go b/cmd/tester/main.go
index f26abf5..d04f2f1 100644
--- a/cmd/tester/main.go
+++ b/cmd/tester/main.go
@@ -108,7 +108,7 @@ func run() error {
 	}
 
 	m := Model{
-		cfgPath: strings.Join(cfgPaths, ", "),
+		host:    fqdn(),
 		vips:    vips,
 		opts:    opts,
 		startAt: time.Now(),
@@ -158,6 +158,24 @@ func run() error {
 // deterministic TUI layout: within a file, frontends are visited
 // in name-sorted order; across files, the first occurrence of each
 // tuple wins and fixes its slot in the output.
+// fqdn returns the system's fully-qualified hostname: gethostname(2)
+// via os.Hostname() for the short name, then a CNAME lookup to reach
+// the canonical form the resolver would hand back — the same two-step
+// dance `hostname -f` performs. Falls back to the short name when the
+// resolver has nothing to add, so the TUI header always renders.
+func fqdn() string {
+	h, err := os.Hostname()
+	if err != nil {
+		return "unknown"
+	}
+	if cname, err := net.LookupCNAME(h); err == nil {
+		if s := strings.TrimSuffix(cname, "."); s != "" {
+			return s
+		}
+	}
+	return h
+}
+
 func buildVIPsUnion(cfgs []*config.Config, cfgPaths []string, filterRe *regexp.Regexp, opts probeOpts) []*vipState {
 	_ = cfgPaths // reserved for future diagnostics (e.g. which file this tuple came from)
 	type key struct {
diff --git a/cmd/tester/model.go b/cmd/tester/model.go
index cb0f2b1..e8bb778 100644
--- a/cmd/tester/model.go
+++ b/cmd/tester/model.go
@@ -75,7 +75,7 @@ type errEvent struct {
 // probeResultMsg handlers can update rolling/tally without copying
 // the whole model.
 type Model struct {
-	cfgPath string
+	host    string
 	vips    []*vipState
 	opts    probeOpts
 	startAt time.Time
diff --git a/cmd/tester/view.go b/cmd/tester/view.go
index 050eaf4..9797083 100644
--- a/cmd/tester/view.go
+++ b/cmd/tester/view.go
@@ -149,7 +149,7 @@ func (m Model) viewHeader() string {
 	}
 	line := fmt.Sprintf(
 		"maglevt — %s — interval: %s  timeout: %s  header: %s  [%s]  uptime: %s",
-		m.cfgPath,
+		m.host,
 		m.opts.Interval,
 		m.opts.Timeout,
 		m.opts.Header,