Fix the inject not supporting GitHub SHA mode version (#84)

Author: mrproliu

tools/go-agent/cmd/injector.go

@@ -25,6 +25,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"regexp"
 	"strings"
 
 	"github.com/apache/skywalking-go/tools/go-agent/tools"
@@ -33,16 +34,23 @@ import (
 	"github.com/dave/dst/decorator"
 )
 
-var projectBaseImportPath = "github.com/apache/skywalking-go"
-var goModFileName = "go.mod"
+const (
+	projectBaseImportPath = "github.com/apache/skywalking-go"
+	goModFileName         = "go.mod"
 
-var swImportFileName = "skywalking_inject.go"
-var swImportFileContent = fmt.Sprintf(`// Code generated by skywalking-go-agent. DO NOT EDIT.
+	swImportFileName = "skywalking_inject.go"
+)
+
+var (
+	swImportFileContent = fmt.Sprintf(`// Code generated by skywalking-go-agent. DO NOT EDIT.
 
 package main
 	
 import _ "%s"`, projectBaseImportPath)
 
+	gitSHARegex = regexp.MustCompile(`^[0-9a-fA-F]{40}$|^[0-9a-fA-F]{7}$`)
+)
+
 type projectInjector struct {
 }
 
@@ -133,8 +141,12 @@ func (i *projectInjector) findGoModFileInDir(dir string) bool {
 }
 
 func (i *projectInjector) injectLibraryInRoot(dir string) error {
-	fmt.Printf("injecting skywalking-go@v%s depenedency into %s\n", version, dir)
-	command := exec.Command("go", "get", "github.com/apache/skywalking-go@v"+version)
+	v := version
+	if !gitSHARegex.MatchString(version) {
+		v = "v" + version
+	}
+	fmt.Printf("injecting skywalking-go@%s depenedency into %s\n", v, dir)
+	command := exec.Command("go", "get", "github.com/apache/skywalking-go@"+v)
 	command.Dir = dir
 	command.Stdin = os.Stdin
 	command.Stdout = os.Stdout

tools/go-agent/cmd/injector_test.go

@@ -39,3 +39,9 @@ func TestContainsMainPackage(t *testing.T) {
 	assert.Nil(t, err, "should not return an error")
 	assert.True(t, mainPackage, "should contain main package")
 }
+
+func TestGithubSHA(t *testing.T) {
+	assert.True(t, gitSHARegex.MatchString("f7a33a6d91a74a3e8b524f9395b0457ea64c02b8"), "should be GitHub SHA")
+	assert.True(t, gitSHARegex.MatchString("f7a33a6"), "should be GitHub short SHA")
+	assert.False(t, gitSHARegex.MatchString("0.1.0"), "should not be GitHub SHA")
+}