s

gitcmd/git.go

@@ -0,0 +1,58 @@
+package gitcmd
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"os/exec"
+	"strings"
+	"sync"
+)
+
+var (
+	gitExecPath string
+	gitOnce     sync.Once
+	gitErr      error
+)
+
+func SetExecutable(path string) {
+	gitExecPath = path
+}
+
+func Executable() (string, error) {
+	gitOnce.Do(func() {
+		if gitExecPath == "" {
+			gitExecPath, gitErr = exec.LookPath("git")
+		}
+	})
+	return gitExecPath, gitErr
+}
+
+func HomeDir() string {
+	if dir := os.Getenv("GIT_HOME"); dir != "" {
+		return dir
+	}
+	return os.TempDir()
+}
+
+func CommonEnvs() []string {
+	return []string{
+		"HOME=" + HomeDir(),
+		"GIT_CONFIG_NOSYSTEM=1",
+		"GIT_NO_REPLACE_OBJECTS=1",
+		"GIT_TERMINAL_PROMPT=0",
+		"LC_ALL=C",
+	}
+}
+
+func Version(ctx context.Context) (string, error) {
+	stdout, _, err := NewCommand("version").RunStdString(ctx)
+	if err != nil {
+		return "", fmt.Errorf("git version: %w", err)
+	}
+	fields := strings.Fields(stdout)
+	if len(fields) >= 3 {
+		return fields[2], nil
+	}
+	return stdout, nil
+}