Add git revision to migration-verifier. (#70)

This will help debugging cases where migration-verifier may have been built from an old revision.

Author: FGasper

.github/workflows/all.yml

@@ -83,7 +83,7 @@ jobs:
         run: yes | m stable && dirname $(readlink $(which mongod)) > .metapath
 
       - name: Build
-        run: go build main/migration_verifier.go
+        run: ./build.sh
 
       - name: Start clusters
         run: |-

README.md

@@ -6,11 +6,9 @@ _This Repository is NOT an officially supported MongoDB product. This tool reduc
 
 
 ```
-go build main/migration_verifier.go
+./build.sh
 ```
 
-
-
 # Operational UX Once Running 
 
 _Assumes no port set, default port for operation webserver is 27020_

build.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+commit=$(git show --no-patch --format='%H')
+
+go build -ldflags="-X 'main.Revision=$commit'" main/migration_verifier.go

main/migration_verifier.go

@@ -43,6 +43,9 @@ const (
 	pprofInterval         = "pprofInterval"
 )
 
+// This gets set at build time.
+var Revision = "Unknown; build with build.sh."
+
 func main() {
 	zerolog.ErrorStackMarshaler = pkgerrors.MarshalStack
 
@@ -154,9 +157,10 @@ func main() {
 	}
 
 	app := &cli.App{
-		Name:  "migration-verifier",
-		Usage: "verify migration correctness",
-		Flags: flags,
+		Name:    "migration-verifier",
+		Usage:   "verify migration correctness",
+		Version: Revision,
+		Flags:   flags,
 		Before: func(cCtx *cli.Context) error {
 			confFile := cCtx.String(configFileFlag)
 
@@ -203,6 +207,10 @@ func handleArgs(ctx context.Context, cCtx *cli.Context) (*verifier.Verifier, err
 
 	v := verifier.NewVerifier(verifierSettings, logPath)
 
+	v.GetLogger().Info().
+		Str("revision", Revision).
+		Msg("migration-verifier started.")
+
 	err := v.SetSrcURI(ctx, cCtx.String(srcURI))
 	if err != nil {
 		return nil, err