package yqlib import ( "io" "os" ) func safelyRenameFile(from string, to string) { if renameError := os.Rename(from, to); renameError != nil { log.Debugf("Error renaming from %v to %v, attempting to copy contents", from, to) log.Debug(renameError.Error()) // can't do this rename when running in docker to a file targeted in a mounted volume, // so gracefully degrade to copying the entire contents. if copyError := copyFileContents(from, to); copyError != nil { log.Errorf("Failed copying from %v to %v", from, to) log.Error(copyError.Error()) } else { removeErr := os.Remove(from) if removeErr != nil { log.Errorf("failed removing original file: %s", from) } } } } // thanks https://stackoverflow.com/questions/21060945/simple-way-to-copy-a-file-in-golang func copyFileContents(src, dst string) (err error) { // ignore CWE-22 gosec issue - that's more targetted for http based apps that run in a public directory, // and ensuring that it's not possible to give a path to a file outside thar directory. in, err := os.Open(src) // #nosec if err != nil { return err } defer safelyCloseFile(in) out, err := os.Create(dst) if err != nil { return err } defer safelyCloseFile(out) if _, err = io.Copy(out, in); err != nil { return err } return out.Sync() } func safelyCloseFile(file *os.File) { err := file.Close() if err != nil { log.Error("Error closing file!") log.Error(err.Error()) } }