docker-volume-backup/cmd/backup/util.go

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// Copyright 2022 - Offen Authors <hioffen@posteo.de>
// SPDX-License-Identifier: MPL-2.0
package main
import (
"bytes"
"fmt"
"io"
"os"
)
var noop = func() error { return nil }
// remove removes the given file or directory from disk.
func remove(location string) error {
fi, err := os.Lstat(location)
if err != nil {
if os.IsNotExist(err) {
return nil
}
return fmt.Errorf("remove: error checking for existence of `%s`: %w", location, err)
}
if fi.IsDir() {
err = os.RemoveAll(location)
} else {
err = os.Remove(location)
}
if err != nil {
return fmt.Errorf("remove: error removing `%s`: %w", location, err)
}
return nil
}
// buffer takes an io.Writer and returns a wrapped version of the
// writer that writes to both the original target as well as the returned buffer
func buffer(w io.Writer) (io.Writer, *bytes.Buffer) {
buffering := &bufferingWriter{buf: bytes.Buffer{}, writer: w}
return buffering, &buffering.buf
}
type bufferingWriter struct {
buf bytes.Buffer
writer io.Writer
}
func (b *bufferingWriter) Write(p []byte) (n int, err error) {
if n, err := b.buf.Write(p); err != nil {
return n, fmt.Errorf("(*bufferingWriter).Write: error writing to buffer: %w", err)
}
return b.writer.Write(p)
}