Don't restart project-clone container and persist logs.

Signed-off-by: Angel Misevski <amisevsk@redhat.com>

project-clone/main.go

@@ -13,17 +13,31 @@
 package main
 
 import (
+	"io"
 	"log"
 	"os"
+	"path"
 
 	"github.com/devfile/devworkspace-operator/project-clone/internal"
 	"github.com/devfile/devworkspace-operator/project-clone/internal/git"
 	"github.com/devfile/devworkspace-operator/project-clone/internal/zip"
 )
 
+const (
+	logFileName    = "project-clone-errors.log"
+	tmpLogFilePath = "/tmp/" + logFileName
+)
+
 // TODO: Handle sparse checkout
 // TODO: Add support for auth
 func main() {
+	f, err := os.Create(tmpLogFilePath)
+	if err != nil {
+		log.Printf("failed to open file %s for logging: %s", tmpLogFilePath, err)
+	}
+	mw := io.MultiWriter(os.Stdout, f)
+	log.SetOutput(mw)
+
 	workspace, err := internal.ReadFlattenedDevWorkspace()
 	if err != nil {
 		log.Printf("Failed to read current DevWorkspace: %s", err)
@@ -39,11 +53,34 @@ func main() {
 			err = zip.SetupZipProject(project)
 		default:
 			log.Printf("Project does not specify Git or Zip source")
-			os.Exit(1)
+			copyLogFileToProjectsRoot()
+			os.Exit(0)
 		}
 		if err != nil {
 			log.Printf("Encountered error while setting up project %s: %s", project.Name, err)
-			os.Exit(1)
+			copyLogFileToProjectsRoot()
+			os.Exit(0)
 		}
 	}
 }
+
+// copyLogFileToProjectsRoot copies the predefined log file into a persistent directory ($PROJECTS_ROOT)
+// so that issues in setting up a devfile's projects are persisted beyond workspace restarts. Note that
+// not all output from the project clone container is propagated to the log file. For example, the progress
+// in cloning a project using the `git` binary only appears in stdout/stderr.
+func copyLogFileToProjectsRoot() {
+	infile, err := os.Open(tmpLogFilePath)
+	if err != nil {
+		log.Printf("Failed to open log file: %s", err)
+	}
+	defer infile.Close()
+	outfile, err := os.Create(path.Join(internal.ProjectsRoot, logFileName))
+	if err != nil {
+		log.Printf("Failed to create log file: %s", err)
+	}
+	defer outfile.Close()
+
+	if _, err := io.Copy(outfile, infile); err != nil {
+		log.Printf("Failed to copy log file to $PROJECTS_ROOT: %s", err)
+	}
+}