feat: log version at startup (#178)

Fixes #132

Makefile

@@ -11,7 +11,7 @@ BINARIES=$(shell cd $(ROOT_DIR)/cmd && ls -1 | grep -v ^common)
 GOMODULE=$(shell grep ^module $(ROOT_DIR)/go.mod | awk '{ print $$2 }')
 
 # Set version strings based on git tag and current ref
-GO_LDFLAGS=-ldflags "-s -w"
+GO_LDFLAGS=-ldflags "-s -w -X '$(GOMODULE)/internal/version.Version=$(shell git describe --tags --exact-match 2>/dev/null)' -X '$(GOMODULE)/internal/version.CommitHash=$(shell git rev-parse --short HEAD)'"
 
 .PHONY: build mod-tidy clean format golines test
 

cmd/cdnsd/main.go

@@ -1,4 +1,4 @@
-// Copyright 2023 Blink Labs Software
+// Copyright 2024 Blink Labs Software
 //
 // Use of this source code is governed by an MIT-style
 // license that can be found in the LICENSE file or at
@@ -20,6 +20,7 @@ import (
 	"github.com/blinklabs-io/cdnsd/internal/indexer"
 	"github.com/blinklabs-io/cdnsd/internal/logging"
 	"github.com/blinklabs-io/cdnsd/internal/state"
+	"github.com/blinklabs-io/cdnsd/internal/version"
 )
 
 var cmdlineFlags struct {
@@ -54,6 +55,10 @@ func main() {
 		}
 	}()
 
+	logger.Info(
+		fmt.Sprintf("cdnsd %s started", version.GetVersionString()),
+	)
+
 	// Load state
 	if err := state.GetState().Load(); err != nil {
 		logger.Fatalf("failed to load state: %s", err)

internal/version/version.go

@@ -0,0 +1,23 @@
+// Copyright 2024 Blink Labs Software
+//
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file or at
+// https://opensource.org/licenses/MIT.
+
+package version
+
+import (
+	"fmt"
+)
+
+// These are populated at build time
+var Version string
+var CommitHash string
+
+func GetVersionString() string {
+	if Version != "" {
+		return fmt.Sprintf("%s (commit %s)", Version, CommitHash)
+	} else {
+		return fmt.Sprintf("devel (commit %s)", CommitHash)
+	}
+}