Function CopyRegularFile

pkg/util/fsutil/fsutil.go:518–637

CopyRegularFile copies a regular file

(clone bool, src, dst string, makeDir bool)

// CopyRegularFile copies a regular file
func CopyRegularFile(clone bool, src, dst string, makeDir bool) error {
	log.Debugf("CopyRegularFile(%v,%v,%v,%v)", clone, src, dst, makeDir)
	//'clone' should be true only for the dst files that need to clone the dir properties from src
	s, err := os.Open(src)
	if err != nil {
		return err
	}
	defer s.Close()

	srcFileInfo, err := s.Stat()
	if err != nil {
		return err
	}

	if !srcFileInfo.Mode().IsRegular() {
		return ErrSrcNotRegularFile
	}

	if makeDir {
		dstDirPath := FileDir(dst)
		if _, err := os.Stat(dstDirPath); err != nil {
			if os.IsNotExist(err) {
				srcDirPath := FileDir(src)

				if clone {
					cloneDirPath(srcDirPath, dstDirPath)
				} else {
					var dirMode os.FileMode = 0777
					err = os.MkdirAll(dstDirPath, dirMode)
					if err != nil {
						return err
					}

					//try copying the timestamps too (even without cloning)
					srcDirInfo, err := os.Stat(srcDirPath)
					if err == nil {
						if sysStat, ok := srcDirInfo.Sys().(*syscall.Stat_t); ok {
							ssi := SysStatInfo(sysStat)
							if ssi.Ok {
								if err := UpdateFileTimes(dstDirPath, ssi.Atime, ssi.Mtime); err != nil {
									log.Warnf("CopyRegularFile() - UpdateFileTimes(%v) error - %v", dstDirPath, err)
								}
							}
						}
					} else {
						log.Warnf("CopyRegularFile() - os.Stat(%v) error - %v", srcDirPath, err)
					}
				}
			} else {
				return err
			}
		}
	}

	d, err := os.Create(dst)
	if err != nil {
		return err
	}