mirror of
https://github.com/offen/docker-volume-backup.git
synced 2024-09-19 21:20:28 +02:00
Frederik Ring
c3daeacecb
* Query for labeled services as well * Try scaling down services * Scale services back up * Use progress tool from Docker CLI * In test, label both services * Clean up error and log messages * Document scale-up/down approach in docs * Downgrade Docker CLI to match client * Document services stats * Do not rely on PreviousSpec for storing desired replica count * Log warnings from Docker when updating services * Check whether container and service labels collide * Document script behavior on label collision * Add additional check if all containers have been removed * Scale services concurrently * Move docker interaction code into own file * Factor out code for service updating * Time out after five minutes of not reaching desired container count * Inline handling of in-swarm container level restart * Timer is more suitable for timeout race * Timeout when scaling down services should be configurable * Choose better filename * Reflect changes in naming * Rename and deprecate BACKUP_STOP_CONTAINER_LABEL * Improve logging * Further simplify logging
82 lines
1.6 KiB
Go
82 lines
1.6 KiB
Go
// Copyright 2022 - Offen Authors <hioffen@posteo.de>
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// SPDX-License-Identifier: MPL-2.0
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package main
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import (
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"bytes"
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"fmt"
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"io"
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"os"
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"sync"
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)
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var noop = func() error { return nil }
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// remove removes the given file or directory from disk.
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func remove(location string) error {
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fi, err := os.Lstat(location)
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if err != nil {
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if os.IsNotExist(err) {
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return nil
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}
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return fmt.Errorf("remove: error checking for existence of `%s`: %w", location, err)
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}
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if fi.IsDir() {
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err = os.RemoveAll(location)
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} else {
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err = os.Remove(location)
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}
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if err != nil {
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return fmt.Errorf("remove: error removing `%s`: %w", location, err)
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}
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return nil
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}
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// buffer takes an io.Writer and returns a wrapped version of the
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// writer that writes to both the original target as well as the returned buffer
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func buffer(w io.Writer) (io.Writer, *bytes.Buffer) {
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buffering := &bufferingWriter{buf: bytes.Buffer{}, writer: w}
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return buffering, &buffering.buf
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}
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type bufferingWriter struct {
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buf bytes.Buffer
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writer io.Writer
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}
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func (b *bufferingWriter) Write(p []byte) (n int, err error) {
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if n, err := b.buf.Write(p); err != nil {
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return n, fmt.Errorf("(*bufferingWriter).Write: error writing to buffer: %w", err)
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}
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return b.writer.Write(p)
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}
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type noopWriteCloser struct {
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io.Writer
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}
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func (noopWriteCloser) Close() error {
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return nil
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}
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type handledSwarmService struct {
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serviceID string
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initialReplicaCount uint64
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}
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type concurrentSlice[T any] struct {
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val []T
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sync.Mutex
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}
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func (c *concurrentSlice[T]) append(v T) {
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c.Lock()
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defer c.Unlock()
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c.val = append(c.val, v)
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}
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func (c *concurrentSlice[T]) value() []T {
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return c.val
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}
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