func()

in file/rotator.go [243:279]

• 29 lines of code
• 8 McCabe index (conditional complexity)

func (r *Rotator) openNew() error {
	err := os.MkdirAll(r.dir(), r.dirMode())
	if err != nil {
		return fmt.Errorf("failed to make directories for new file: %w", err)
	}

	stat, err := os.Lstat(r.rot.ActiveFile())
	if err == nil {
		isSymlink := stat.Mode()&fs.ModeSymlink != 0

		// check if the file has to be rotated before writing to it
		reason, t := r.isRotationTriggered(0)
		if reason == rotateReasonNoRotate {
			// To avoid symlink following attacks, if the active file is a symlink
			// we need to rotate it to avoid writing to the symlink target, which
			// could be a sensitive or protected file not owned by us.
			if isSymlink {
				if r.log != nil {
					r.log.Debugw("Active file is a symlink, forcing rotation", "filename", r.rot.ActiveFile())
				}
				reason = rotateReasonInitializing
				t = r.clock.Now()
			} else {
				return r.appendToFile()
			}
		}

		if err = r.rot.Rotate(reason, t); err != nil {
			return fmt.Errorf("failed to rotate backups: %w", err)
		}
		if err = r.purge(); err != nil {
			return fmt.Errorf("failed to purge unnecessary rotated files: %w", err)
		}
	}

	return r.openFile()
}