From b2c2fdd9aa0f9b93b777a890e77a438b164a8a74 Mon Sep 17 00:00:00 2001
From: Alessio Treglia <alessio@tendermint.com>
Date: Mon, 9 Nov 2020 15:25:17 +0000
Subject: [PATCH] enrich version --long's output with build deps

The output of the version --long command now shows
the list of build dependencies.

From: #7848
Closes: #7835
---
 version/version.go | 39 ++++++++++++++++++++++++++++++++-------
 1 file changed, 32 insertions(+), 7 deletions(-)

diff --git a/version/version.go b/version/version.go
index 9429a9c1f9f1..9ce86e94c5da 100644
--- a/version/version.go
+++ b/version/version.go
@@ -18,8 +18,10 @@
 package version
 
 import (
+	"encoding/json"
 	"fmt"
 	"runtime"
+	"runtime/debug"
 )
 
 var (
@@ -39,13 +41,14 @@ var (
 
 // Info defines the application version information.
 type Info struct {
-	Name       string `json:"name" yaml:"name"`
-	ServerName string `json:"server_name" yaml:"server_name"`
-	ClientName string `json:"client_name" yaml:"client_name"`
-	Version    string `json:"version" yaml:"version"`
-	GitCommit  string `json:"commit" yaml:"commit"`
-	BuildTags  string `json:"build_tags" yaml:"build_tags"`
-	GoVersion  string `json:"go" yaml:"go"`
+	Name       string     `json:"name" yaml:"name"`
+	ServerName string     `json:"server_name" yaml:"server_name"`
+	ClientName string     `json:"client_name" yaml:"client_name"`
+	Version    string     `json:"version" yaml:"version"`
+	GitCommit  string     `json:"commit" yaml:"commit"`
+	BuildTags  string     `json:"build_tags" yaml:"build_tags"`
+	GoVersion  string     `json:"go" yaml:"go"`
+	BuildDeps  []buildDep `json:"build_deps" yaml:"build_deps"`
 }
 
 func NewInfo() Info {
@@ -57,6 +60,7 @@ func NewInfo() Info {
 		GitCommit:  Commit,
 		BuildTags:  BuildTags,
 		GoVersion:  fmt.Sprintf("go version %s %s/%s", runtime.Version(), runtime.GOOS, runtime.GOARCH),
+		BuildDeps:  depsFromBuildInfo(),
 	}
 }
 
@@ -68,3 +72,24 @@ build tags: %s
 		vi.Name, vi.Version, vi.GitCommit, vi.BuildTags, vi.GoVersion,
 	)
 }
+
+func depsFromBuildInfo() (deps []buildDep) {
+	buildInfo, ok := debug.ReadBuildInfo()
+	if !ok {
+		return nil
+	}
+
+	for _, dep := range buildInfo.Deps {
+		deps = append(deps, buildDep{dep})
+	}
+
+	return
+}
+
+type buildDep struct {
+	*debug.Module
+}
+
+func (d buildDep) String() string                    { return fmt.Sprintf("%s@%s", d.Path, d.Version) }
+func (d buildDep) MarshalJSON() ([]byte, error)      { return json.Marshal(d.String()) }
+func (d buildDep) MarshalYAML() (interface{}, error) { return d.String(), nil }