Official Go implementation of the Ethereum protocol
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go-ethereum/internal/version/version.go

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// Copyright 2022 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// Package version implements reading of build version information.
package version
import (
"fmt"
"runtime"
"runtime/debug"
"strings"
"github.com/ethereum/go-ethereum/params"
)
const ourPath = "github.com/ethereum/go-ethereum" // Path to our module
// These variables are set at build-time by the linker when the build is
// done by build/ci.go.
var gitCommit, gitDate string
// VCSInfo represents the git repository state.
type VCSInfo struct {
Commit string // head commit hash
Date string // commit time in YYYYMMDD format
Dirty bool
}
// VCS returns version control information of the current executable.
func VCS() (VCSInfo, bool) {
if gitCommit != "" {
// Use information set by the build script if present.
return VCSInfo{Commit: gitCommit, Date: gitDate}, true
}
if buildInfo, ok := debug.ReadBuildInfo(); ok {
if buildInfo.Main.Path == ourPath {
return buildInfoVCS(buildInfo)
}
}
return VCSInfo{}, false
}
// ClientName creates a software name/version identifier according to common
// conventions in the Ethereum p2p network.
func ClientName(clientIdentifier string) string {
git, _ := VCS()
return fmt.Sprintf("%s/v%v/%v-%v/%v",
strings.Title(clientIdentifier),
params.VersionWithCommit(git.Commit, git.Date),
runtime.GOOS, runtime.GOARCH,
runtime.Version(),
)
}
// runtimeInfo returns build and platform information about the current binary.
//
// If the package that is currently executing is a prefixed by our go-ethereum
// module path, it will print out commit and date VCS information. Otherwise,
// it will assume it's imported by a third-party and will return the imported
// version and whether it was replaced by another module.
func Info() (version, vcs string) {
version = params.VersionWithMeta
buildInfo, ok := debug.ReadBuildInfo()
if !ok {
return version, ""
}
version = versionInfo(buildInfo)
if status, ok := VCS(); ok {
modified := ""
if status.Dirty {
modified = " (dirty)"
}
commit := status.Commit
if len(commit) > 8 {
commit = commit[:8]
}
vcs = commit + "-" + status.Date + modified
}
return version, vcs
}
// versionInfo returns version information for the currently executing
// implementation.
//
// Depending on how the code is instansiated, it returns different amounts of
// information. If it is unable to determine which module is related to our
// package it falls back to the hardcoded values in the params package.
func versionInfo(info *debug.BuildInfo) string {
// If the main package is from our repo, prefix version with "geth".
if strings.HasPrefix(info.Path, ourPath) {
return fmt.Sprintf("geth %s", info.Main.Version)
}
// Not our main package, so explicitly print out the module path and
// version.
var version string
if info.Main.Path != "" && info.Main.Version != "" {
// These can be empty when invoked with "go run".
version = fmt.Sprintf("%s@%s ", info.Main.Path, info.Main.Version)
}
mod := findModule(info, ourPath)
if mod == nil {
// If our module path wasn't imported, it's unclear which
// version of our code they are running. Fallback to hardcoded
// version.
return version + fmt.Sprintf("geth %s", params.VersionWithMeta)
}
// Our package is a dependency for the main module. Return path and
// version data for both.
version += fmt.Sprintf("%s@%s", mod.Path, mod.Version)
if mod.Replace != nil {
// If our package was replaced by something else, also note that.
version += fmt.Sprintf(" (replaced by %s@%s)", mod.Replace.Path, mod.Replace.Version)
}
return version
}
// findModule returns the module at path.
func findModule(info *debug.BuildInfo, path string) *debug.Module {
if info.Path == ourPath {
return &info.Main
}
for _, mod := range info.Deps {
if mod.Path == path {
return mod
}
}
return nil
}