Add util package

internal/util/compress.go

@@ -0,0 +1,73 @@
+package util
+
+import (
+	"compress/gzip"
+	"io"
+	"os"
+
+	"github.com/ClusterCockpit/cc-backend/pkg/log"
+)
+
+func CompressFile(fileIn string, fileOut string) error {
+	originalFile, err := os.Open(fileIn)
+	if err != nil {
+		log.Errorf("CompressFile() error: %v", err)
+		return err
+	}
+	defer originalFile.Close()
+
+	gzippedFile, err := os.Create(fileOut)
+
+	if err != nil {
+		log.Errorf("CompressFile() error: %v", err)
+		return err
+	}
+	defer gzippedFile.Close()
+
+	gzipWriter := gzip.NewWriter(gzippedFile)
+	defer gzipWriter.Close()
+
+	_, err = io.Copy(gzipWriter, originalFile)
+	if err != nil {
+		log.Errorf("CompressFile() error: %v", err)
+		return err
+	}
+	gzipWriter.Flush()
+	if err := os.Remove(fileIn); err != nil {
+		log.Errorf("CompressFile() error: %v", err)
+		return err
+	}
+
+	return nil
+}
+
+func UncompressFile(fileIn string, fileOut string) error {
+	gzippedFile, err := os.Open(fileIn)
+	if err != nil {
+		log.Errorf("UncompressFile() error: %v", err)
+		return err
+	}
+	defer gzippedFile.Close()
+
+	gzipReader, _ := gzip.NewReader(gzippedFile)
+	defer gzipReader.Close()
+
+	uncompressedFile, err := os.Create(fileOut)
+	if err != nil {
+		log.Errorf("UncompressFile() error: %v", err)
+		return err
+	}
+	defer uncompressedFile.Close()
+
+	_, err = io.Copy(uncompressedFile, gzipReader)
+	if err != nil {
+		log.Errorf("UncompressFile() error: %v", err)
+		return err
+	}
+	if err := os.Remove(fileIn); err != nil {
+		log.Errorf("UncompressFile() error: %v", err)
+		return err
+	}
+
+	return nil
+}

internal/util/copy.go

@@ -0,0 +1,106 @@
+package util
+
+import (
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+)
+
+func CopyFile(src, dst string) (err error) {
+	in, err := os.Open(src)
+	if err != nil {
+		return
+	}
+	defer in.Close()
+
+	out, err := os.Create(dst)
+	if err != nil {
+		return
+	}
+	defer func() {
+		if e := out.Close(); e != nil {
+			err = e
+		}
+	}()
+
+	_, err = io.Copy(out, in)
+	if err != nil {
+		return
+	}
+
+	err = out.Sync()
+	if err != nil {
+		return
+	}
+
+	si, err := os.Stat(src)
+	if err != nil {
+		return
+	}
+	err = os.Chmod(dst, si.Mode())
+	if err != nil {
+		return
+	}
+
+	return
+}
+
+// CopyDir recursively copies a directory tree, attempting to preserve permissions.
+// Source directory must exist, destination directory must *not* exist.
+// Symlinks are ignored and skipped.
+func CopyDir(src string, dst string) (err error) {
+	src = filepath.Clean(src)
+	dst = filepath.Clean(dst)
+
+	si, err := os.Stat(src)
+	if err != nil {
+		return err
+	}
+	if !si.IsDir() {
+		return fmt.Errorf("source is not a directory")
+	}
+
+	_, err = os.Stat(dst)
+	if err != nil && !os.IsNotExist(err) {
+		return
+	}
+	if err == nil {
+		return fmt.Errorf("destination already exists")
+	}
+
+	err = os.MkdirAll(dst, si.Mode())
+	if err != nil {
+		return
+	}
+
+	entries, err := ioutil.ReadDir(src)
+	if err != nil {
+		return
+	}
+
+	for _, entry := range entries {
+		srcPath := filepath.Join(src, entry.Name())
+		dstPath := filepath.Join(dst, entry.Name())
+
+		if entry.IsDir() {
+			err = CopyDir(srcPath, dstPath)
+			if err != nil {
+				return
+			}
+		} else {
+			// Skip symlinks.
+			if entry.Mode()&os.ModeSymlink != 0 {
+				continue
+			}
+
+			err = CopyFile(srcPath, dstPath)
+			if err != nil {
+				return
+			}
+		}
+	}
+
+	return
+}

internal/util/fstat.go

@@ -0,0 +1,30 @@
+package util
+
+import (
+	"errors"
+	"os"
+
+	"github.com/ClusterCockpit/cc-backend/pkg/log"
+)
+
+func CheckFileExists(filePath string) bool {
+	_, err := os.Stat(filePath)
+	return !errors.Is(err, os.ErrNotExist)
+}
+
+func GetFilesize(filePath string) int64 {
+	fileInfo, err := os.Stat(filePath)
+	if err != nil {
+		log.Errorf("Error on Stat %s: %v", filePath, err)
+	}
+	return fileInfo.Size()
+}
+
+func GetFilecount(path string) int {
+	files, err := os.ReadDir(path)
+	if err != nil {
+		log.Errorf("Error on ReadDir %s: %v", path, err)
+	}
+
+	return len(files)
+}