refactor(stack): stack build process backend only [EE-4342] (#7750)

api/stacks/stackutils/gitops.go

@@ -0,0 +1,47 @@
+package stackutils
+
+import (
+	"fmt"
+
+	"github.com/pkg/errors"
+	portainer "github.com/portainer/portainer/api"
+	gittypes "github.com/portainer/portainer/api/git/types"
+)
+
+var (
+	ErrStackAlreadyExists     = errors.New("A stack already exists with this name")
+	ErrWebhookIDAlreadyExists = errors.New("A webhook ID already exists")
+	ErrInvalidGitCredential   = errors.New("Invalid git credential")
+)
+
+// DownloadGitRepository downloads the target git repository on the disk
+// The first return value represents the commit hash of the downloaded git repository
+func DownloadGitRepository(stackID portainer.StackID, config gittypes.RepoConfig, gitService portainer.GitService, fileService portainer.FileService) (string, error) {
+	username := ""
+	password := ""
+	if config.Authentication != nil {
+		username = config.Authentication.Username
+		password = config.Authentication.Password
+	}
+
+	stackFolder := fmt.Sprintf("%d", stackID)
+	projectPath := fileService.GetStackProjectPath(stackFolder)
+
+	err := gitService.CloneRepository(projectPath, config.URL, config.ReferenceName, username, password)
+	if err != nil {
+		if err == gittypes.ErrAuthenticationFailure {
+			newErr := ErrInvalidGitCredential
+			return "", newErr
+		}
+
+		newErr := fmt.Errorf("unable to clone git repository: %w", err)
+		return "", newErr
+	}
+
+	commitID, err := gitService.LatestCommitID(config.URL, config.ReferenceName, username, password)
+	if err != nil {
+		newErr := fmt.Errorf("unable to fetch git repository id: %w", err)
+		return "", newErr
+	}
+	return commitID, nil
+}