insert buildinfo at compile time

compile.go

@@ -35,10 +35,7 @@ func Compile(cfg *CompileConfig, ch chan<- *CompileReport, wg *sync.WaitGroup) {
 
 	ch <- &CompileReport{Config: cfg, State: StateCompiling}
 
-	args := []string{"build", "-o", filePath}
-	if !*KeepDebugFlags {
-		args = append(args, "-ldflags=-s -w")
-	}
+	args := []string{"build", "-o", filePath, BuildLdFlags(cfg.OS, cfg.Arch)}
 
 	compileCmd := exec.Command("go", args...)
 	compileCmd.Dir = ModulePath

go.mod

@@ -3,6 +3,7 @@ module git.milar.in/milarin/gocc
 go 1.19
 
 require (
+	git.milar.in/milarin/buildinfo v1.0.0
 	git.milar.in/milarin/channel v0.0.7
 	git.milar.in/milarin/configfile v1.0.2
 	git.milar.in/milarin/gmath v0.0.1

go.sum

@@ -1,3 +1,5 @@
+git.milar.in/milarin/buildinfo v1.0.0 h1:tw98GupUYl/0a/3aPGuezhE4wseycOSsbcLp70hy60U=
+git.milar.in/milarin/buildinfo v1.0.0/go.mod h1:arI9ZoENOgcZcanv25k9y4dKDUhPp0buJrlVerGruas=
 git.milar.in/milarin/channel v0.0.7 h1:cVKtwgH/EE7U+XTHcoFCClJ4LR349KanzjX9xKwRcNg=
 git.milar.in/milarin/channel v0.0.7/go.mod h1:We83LTI8S7u7II3pD+A2ChCDWJfCkcBUCUqii9HjTtM=
 git.milar.in/milarin/configfile v1.0.2 h1:QgZVSVDsFm3HK7PEg6a2ANeZxqo0JlIooyyJv8VaCNI=

init.go

@@ -8,6 +8,7 @@ import (
 	"os/exec"
 	"path/filepath"
 
+	"git.milar.in/milarin/buildinfo"
 	"git.milar.in/milarin/configfile"
 )
 
@@ -16,7 +17,7 @@ func Init() {
 	var err error
 
 	if *ShowVersion {
-		fmt.Printf("gocc %s\n", VERSION)
+		buildinfo.Print(buildinfo.Options{})
 		os.Exit(0)
 	}
 

main.go

@@ -16,15 +16,19 @@ import (
 	"git.milar.in/milarin/channel"
 )
 
-var VERSION = "v1.0.3"
-
 // globals
 var (
 	OutputFileTmpl = template.New("output-file")
 
 	ModulePath  string
 	ProjectName string
-	Runner      channel.Runner
+
+	// meta data for executables
+	VersionTag string
+	CommitHash string
+	BuildTime  string
+
+	Runner channel.Runner
 
 	MaxConfigStringLength int
 )
@@ -63,6 +67,7 @@ var (
 
 func main() {
 	Init()
+	GatherMetaData()
 
 	ch := make(chan *CompileReport, len(CompileConfigs))
 	wg := new(sync.WaitGroup)

metadata.go

@@ -0,0 +1,153 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"os/exec"
+	"strings"
+	"time"
+)
+
+func GetCommitHash(hashfmt string) (string, error) {
+	gitCmd := exec.Command("git", "log", "-n", "1", "--pretty=format:"+hashfmt)
+	gitCmd.Dir = ModulePath
+
+	stdout, err := gitCmd.StdoutPipe()
+	if err != nil {
+		return "", err
+	}
+
+	if err := gitCmd.Start(); err != nil {
+		return "", err
+	}
+
+	hashData, err := io.ReadAll(stdout)
+	if err != nil {
+		return "", err
+	}
+
+	if err := gitCmd.Wait(); err != nil {
+		return "", err
+	}
+
+	trimmedHash := strings.TrimSpace(string(hashData))
+	if trimmedHash == "" {
+		return "", errors.New("no valid hash found")
+	}
+
+	return trimmedHash, nil
+}
+
+func GetVersionTag() (string, error) {
+	gitCmd := exec.Command("git", "log", "-n", "1", "--pretty=format:%(describe:tags)")
+	gitCmd.Dir = ModulePath
+
+	stdout, err := gitCmd.StdoutPipe()
+	if err != nil {
+		return "", err
+	}
+
+	if err := gitCmd.Start(); err != nil {
+		return "", err
+	}
+
+	tagData, err := io.ReadAll(stdout)
+	if err != nil {
+		return "", err
+	}
+
+	if err := gitCmd.Wait(); err != nil {
+		return "", err
+	}
+
+	trimmedTag := strings.TrimSpace(string(tagData))
+	if trimmedTag == "" {
+		return "", errors.New("no valid version tag found")
+	}
+
+	return trimmedTag, nil
+}
+
+func WorkTreeChanged() bool {
+	gitCmd := exec.Command("git", "status", "--porcelain")
+	gitCmd.Dir = ModulePath
+
+	stdout, err := gitCmd.StdoutPipe()
+	if err != nil {
+		return false
+	}
+
+	if err := gitCmd.Start(); err != nil {
+		return false
+	}
+
+	data, err := io.ReadAll(stdout)
+	if err != nil {
+		return false
+	}
+
+	if err := gitCmd.Wait(); err != nil {
+		return false
+	}
+
+	return len(data) != 0
+}
+
+func GatherMetaData() {
+	if !WorkTreeChanged() {
+		VersionTag, _ = GetVersionTag()
+		CommitHash, _ = GetCommitHash("%H")
+	} else {
+		hash, _ := GetCommitHash("%h")
+		VersionTag = fmt.Sprintf("(devel-%s)", hash)
+	}
+
+	BuildTime = time.Now().Format(time.RFC3339)
+}
+
+func BuildLdFlags(os, arch string) string {
+	b := &strings.Builder{}
+
+	b.WriteString("-ldflags=")
+
+	if !*KeepDebugFlags {
+		b.WriteString("-s -w")
+	}
+
+	if CommitHash != "" {
+		b.WriteString(" -X ")
+		b.WriteString("git.milar.in/milarin/buildinfo.Commit")
+		b.WriteString("=")
+		b.WriteString(CommitHash)
+	}
+
+	if VersionTag != "" {
+		b.WriteString(" -X ")
+		b.WriteString("git.milar.in/milarin/buildinfo.Version")
+		b.WriteString("=")
+		b.WriteString(VersionTag)
+	}
+
+	b.WriteString(" -X ")
+	b.WriteString("git.milar.in/milarin/buildinfo.Name")
+	b.WriteString("=")
+	b.WriteString(ProjectName)
+
+	b.WriteString(" -X ")
+	b.WriteString("git.milar.in/milarin/buildinfo.BuildTime")
+	b.WriteString("=")
+	b.WriteString(BuildTime)
+
+	b.WriteString(" -X ")
+	b.WriteString("git.milar.in/milarin/buildinfo.OS")
+	b.WriteString("=")
+	b.WriteString(os)
+
+	b.WriteString(" -X ")
+	b.WriteString("git.milar.in/milarin/buildinfo.Arch")
+	b.WriteString("=")
+	b.WriteString(arch)
+
+	return b.String()
+}