added helper func and test

utils/fileutils.go

@@ -606,3 +606,39 @@ func calcChecksumDetails(filePath string) (checksum entities.Checksum, err error
 	checksum = entities.Checksum{Md5: checksumInfo[MD5], Sha1: checksumInfo[SHA1], Sha256: checksumInfo[SHA256]}
 	return
 }
+
+// TODO ERAN fix comment
+// Checks for every file in filesList whether it exists. If so it copies the file to a temporary dir.
+// Returns the path to the directory with all the copied files, or an empty path if none of the files existed
+// The user is responsible to remove containerDir after finish using it
+func KeepFilesInTempDirIfExist(filesList []string) (containerDir string, err error) {
+	if containerDir, err = CreateTempDir(); err != nil {
+		return
+	}
+	defer func() {
+		if err != nil {
+			err = errors.Join(RemoveTempDir(containerDir))
+		}
+	}()
+
+	anyFileOrDirExist := false
+	for _, filePath := range filesList {
+		var exists bool
+		if exists, err = IsFileExists(filePath, false); err != nil {
+			return
+		}
+
+		if exists {
+			anyFileOrDirExist = true
+			if err = CopyFile(containerDir, filePath); err != nil {
+				return
+			}
+		}
+	}
+
+	if !anyFileOrDirExist {
+		err = os.Remove(containerDir)
+		containerDir = ""
+	}
+	return
+}

utils/fileutils_test.go

@@ -1,12 +1,12 @@
 package utils
 
 import (
+	"fmt"
+	"github.com/stretchr/testify/assert"
 	"os"
 	"path/filepath"
 	"strings"
 	"testing"
-
-	"github.com/stretchr/testify/assert"
 )
 
 func TestFindFileInDirAndParents(t *testing.T) {
@@ -54,3 +54,55 @@ func TestReadNLines(t *testing.T) {
 	assert.True(t, strings.HasPrefix(lines[1], "781"))
 	assert.True(t, strings.HasSuffix(lines[1], ":true}}}"))
 }
+
+func TestKeepFilesInTempDirIfExist(t *testing.T) {
+	var testCases = []struct {
+		amountFilesToCreate int
+	}{
+		{
+			amountFilesToCreate: 0,
+		},
+		{
+			amountFilesToCreate: 3,
+		},
+	}
+
+	for _, test := range testCases {
+		t.Run(fmt.Sprintf("with %d files created", test.amountFilesToCreate),
+			func(t *testing.T) {
+				tempDir, err := CreateTempDir()
+				assert.NoError(t, err)
+				defer func() {
+					assert.NoError(t, RemoveTempDir(tempDir), "Couldn't remove temp dir")
+				}()
+
+				var filesList []string
+				for i := 0; i < test.amountFilesToCreate; i++ {
+					var file *os.File
+					file, err = os.CreateTemp(tempDir, "tempfile")
+					assert.NoError(t, err)
+					filesList = append(filesList, file.Name())
+				}
+				containerDir, err := KeepFilesInTempDirIfExist(filesList)
+				defer func() {
+					assert.NoError(t, RemoveTempDir(containerDir), "Couldn't remove temp dir")
+				}()
+				assert.NoError(t, err)
+				if test.amountFilesToCreate > 0 {
+					assert.NotEqual(t, "", containerDir)
+
+					for i := 0; i < test.amountFilesToCreate; i++ {
+						fileName := filepath.Base(filesList[i])
+						expectedFilePath := filepath.Join(containerDir, fileName)
+						var exists bool
+						exists, err = IsFileExists(expectedFilePath, false)
+						assert.NoError(t, err)
+						assert.True(t, exists)
+					}
+				} else {
+					assert.Equal(t, "", containerDir)
+				}
+			})
+	}
+
+}