From 581feffe944a5eeb42f4cba3e4d24f0e1d5b0b3f Mon Sep 17 00:00:00 2001
From: xengineering <me@xengineering.eu>
Date: Tue, 30 Apr 2024 20:50:31 +0200
Subject: Add source version to executable

The output of `git describe --dirty --always` is passed as a string via
Go build flags.
---
 Makefile   |  6 ++++--
 version.go | 13 +++++++++++++
 2 files changed, 17 insertions(+), 2 deletions(-)
 create mode 100644 version.go

diff --git a/Makefile b/Makefile
index 2ae2e86..3e638f7 100644
--- a/Makefile
+++ b/Makefile
@@ -2,14 +2,16 @@ TARGET_EXEC := ceres
 BUILD_DIR := ./build
 MODULE_NAME := xengineering.eu/ceres
 
+VERSION := $(shell git describe --dirty --always)
+
 all: $(BUILD_DIR)/$(TARGET_EXEC)
 
 $(BUILD_DIR)/$(TARGET_EXEC):
-	go build -o $@ $(MODULE_NAME)
+	go build -ldflags "-X main.gitDescribe=$(VERSION)" -o $@ $(MODULE_NAME)
 
 .PHONY: debug
 debug:
-	go run $(MODULE_NAME)
+	go run -ldflags "-X main.gitDescribe=$(VERSION)" $(MODULE_NAME)
 
 .PHONY: clean
 clean:
diff --git a/version.go b/version.go
new file mode 100644
index 0000000..c3cc266
--- /dev/null
+++ b/version.go
@@ -0,0 +1,13 @@
+package main
+
+import "fmt"
+
+var gitDescribe string
+
+func version() (string, error) {
+	if gitDescribe == "" {
+		return "", fmt.Errorf("No version information available")
+	}
+
+	return gitDescribe, nil
+}
-- 
cgit v1.2.3-70-g09d2