internal/version: use gitCommit injection in version handling code (#25851)

This changes the CI build to store the git commit and date into package
internal/version instead of package main. Doing this essentially merges our
two ways of tracking the go-ethereum version into a single place, achieving
two objectives:

- Bad block reports, which use version.Info(), will now have the git commit
  information even when geth is built in an environment such as
  launchpad.net where git access is unavailable.

- For geth builds created by `go build ./cmd/geth` (i.e. not using `go run
  build/ci.go install`), git information stored by the go tool is now used
  in the p2p node name as well as in `geth version` and `geth
  version-check`.

cmd/geth/config.go

@@ -35,6 +35,7 @@ import (
 	"github.com/ethereum/go-ethereum/eth/ethconfig"
 	"github.com/ethereum/go-ethereum/internal/ethapi"
 	"github.com/ethereum/go-ethereum/internal/flags"
+	"github.com/ethereum/go-ethereum/internal/version"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/metrics"
 	"github.com/ethereum/go-ethereum/node"
@@ -108,9 +109,10 @@ func loadConfig(file string, cfg *gethConfig) error {
 }
 
 func defaultNodeConfig() node.Config {
+	git, _ := version.VCS()
 	cfg := node.DefaultConfig
 	cfg.Name = clientIdentifier
-	cfg.Version = params.VersionWithCommit(gitCommit, gitDate)
+	cfg.Version = params.VersionWithCommit(git.Commit, git.Date)
 	cfg.HTTPModules = append(cfg.HTTPModules, "eth")
 	cfg.WSModules = append(cfg.WSModules, "eth")
 	cfg.IPCPath = "geth.ipc"

cmd/geth/main.go

@@ -52,11 +52,6 @@ const (
 )
 
 var (
-	// Git SHA1 commit hash of the release (set via linker flags)
-	gitCommit = ""
-	gitDate   = ""
-	// The app that holds all commands and flags.
-	app = flags.NewApp(gitCommit, gitDate, "the go-ethereum command line interface")
 	// flags that configure the node
 	nodeFlags = flags.Merge([]cli.Flag{
 		utils.IdentityFlag,
@@ -205,6 +200,8 @@ var (
 	}
 )
 
+var app = flags.NewApp("the go-ethereum command line interface")
+
 func init() {
 	// Initialize the CLI app and start Geth
 	app.Action = geth

cmd/geth/misccmd.go

@@ -25,6 +25,7 @@ import (
 
 	"github.com/ethereum/go-ethereum/cmd/utils"
 	"github.com/ethereum/go-ethereum/consensus/ethash"
+	"github.com/ethereum/go-ethereum/internal/version"
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/urfave/cli/v2"
 )
@@ -38,9 +39,7 @@ var (
 	VersionCheckVersionFlag = &cli.StringFlag{
 		Name:  "check.version",
 		Usage: "Version to check",
-		Value: fmt.Sprintf("Geth/v%v/%v-%v/%v",
-			params.VersionWithCommit(gitCommit, gitDate),
-			runtime.GOOS, runtime.GOARCH, runtime.Version()),
+		Value: version.ClientName(clientIdentifier),
 	}
 	makecacheCommand = &cli.Command{
 		Action:    makecache,
@@ -67,7 +66,7 @@ Regular users do not need to execute it.
 `,
 	}
 	versionCommand = &cli.Command{
-		Action:    version,
+		Action:    printVersion,
 		Name:      "version",
 		Usage:     "Print version numbers",
 		ArgsUsage: " ",
@@ -127,14 +126,16 @@ func makedag(ctx *cli.Context) error {
 	return nil
 }
 
-func version(ctx *cli.Context) error {
+func printVersion(ctx *cli.Context) error {
+	git, _ := version.VCS()
+
 	fmt.Println(strings.Title(clientIdentifier))
 	fmt.Println("Version:", params.VersionWithMeta)
-	if gitCommit != "" {
-		fmt.Println("Git Commit:", gitCommit)
+	if git.Commit != "" {
+		fmt.Println("Git Commit:", git.Commit)
 	}
-	if gitDate != "" {
-		fmt.Println("Git Commit Date:", gitDate)
+	if git.Date != "" {
+		fmt.Println("Git Commit Date:", git.Date)
 	}
 	fmt.Println("Architecture:", runtime.GOARCH)
 	fmt.Println("Go Version:", runtime.Version())