From abde949455c9827fcf4ec6deb15bb394765d5ee4 Mon Sep 17 00:00:00 2001
From: Graham McIntire <graham@mcintire.me>
Date: Tue, 24 Mar 2026 12:56:11 -0500
Subject: [PATCH] feat: show build date on agent startup

Inject build timestamp via ldflags during Docker build so the
agent logs when the binary was compiled.
---
 Dockerfile | 2 +-
 main.go    | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/Dockerfile b/Dockerfile
index e32430d..58f07f7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,7 +7,7 @@ COPY . .
 ARG VERSION=dev
 RUN --mount=type=cache,target=/go/pkg/mod \
     --mount=type=cache,target=/root/.cache/go-build \
-    CGO_ENABLED=0 go build -ldflags="-s -w -X main.version=${VERSION}" -o towerops-agent .
+    CGO_ENABLED=0 go build -ldflags="-s -w -X main.version=${VERSION} -X main.buildDate=$(date -u +%Y-%m-%dT%H:%M:%SZ)" -o towerops-agent .
 
 FROM alpine:3.23
 RUN apk add --no-cache ca-certificates iputils libcap
diff --git a/main.go b/main.go
index a83d9ff..edef54d 100644
--- a/main.go
+++ b/main.go
@@ -13,6 +13,7 @@ import (
 )
 
 var version = "dev"
+var buildDate = "unknown"
 
 var insecureFlag bool
 
@@ -71,7 +72,7 @@ func runMain(ctx context.Context, args []string) int {
 		return 1
 	}
 
-	slog.Info("towerops agent starting", "version", version)
+	slog.Info("towerops agent starting", "version", version, "built", buildDate)
 
 	// Convert HTTP(S) to WebSocket URL
 	wsURL, err := toWebSocketURL(*apiURL)