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move handling of config to script layer

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This commit is contained in:
Frederik Ring 2021-08-24 09:01:44 +02:00
parent 2469597848
commit e0c4adc563
6 changed files with 58 additions and 122 deletions
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22
NOTICE
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@ -1,22 +0,0 @@
Copyright 2021 Offen Authors <hioffen@posteo.de>
This project contains software that is Copyright (c) 2018 Futurice
Licensed under the Terms of the MIT License:
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

126
cmd/backup/main.go
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@ -5,13 +5,11 @@ package main
import (
"context"
"errors"
"fmt"
"io"
"os"
"path"
"path/filepath"
"strconv"
"time"
"github.com/docker/docker/api/types"
@ -19,7 +17,7 @@ import (
"github.com/docker/docker/api/types/swarm"
"github.com/docker/docker/client"
"github.com/gofrs/flock"
"github.com/joho/godotenv"
"github.com/kelseyhightower/envconfig"
"github.com/leekchan/timeutil"
minio "github.com/minio/minio-go/v7"
"github.com/minio/minio-go/v7/pkg/credentials"
@ -29,7 +27,7 @@ import (
)
func main() {
unlock := lock("/var/dockervolumebackup.lock")
unlock := lock("/var/lock/dockervolumebackup.lock")
defer unlock()
s := &script{}
@ -51,16 +49,26 @@ type script struct {
logger *logrus.Logger
start time.Time
file string
file string
bucket string
archive string
sources string
passphrase []byte
retentionDays *int
leeway *time.Duration
containerLabel string
pruningPrefix string
c *config
}
type config struct {
BackupSources string `split_words:"true" default:"/backup"`
BackupFilename string `split_words:"true" default:"backup-%Y-%m-%dT%H-%M-%S.tar.gz"`
BackupArchive string `split_words:"true" default:"/archive"`
BackupRetentionDays int32 `split_words:"true" default:"-1"`
BackupPruningLeeway time.Duration `split_words:"true" default:"1m"`
BackupPruningPrefix string `split_words:"true"`
BackupStopContainerLabel string `split_words:"true" default:"true"`
AwsS3BucketName string `split_words:"true"`
AwsEndpoint string `split_words:"true" default:"s3.amazonaws.com"`
AwsEndpointProto string `split_words:"true" default:"https"`
AwsEndpointInsecure bool `split_words:"true"`
AwsAccessKeyID string `envconfig:"AWS_ACCESS_KEY_ID"`
AwsSecretAccessKey string `split_words:"true"`
GpgPassphrase string `split_words:"true"`
}
// init creates all resources needed for the script to perform actions against
@ -72,8 +80,9 @@ func (s *script) init() error {
s.logger = logrus.New()
s.logger.SetOutput(os.Stdout)
if err := godotenv.Load("/etc/backup.env"); err != nil {
return fmt.Errorf("init: failed to load env file: %w", err)
s.c = &config{}
if err := envconfig.Process("", s.c); err != nil {
return fmt.Errorf("init: failed to process configuration values: %w", err)
}
_, err := os.Stat("/var/run/docker.sock")
@ -85,15 +94,14 @@ func (s *script) init() error {
s.cli = cli
}
if bucket := os.Getenv("AWS_S3_BUCKET_NAME"); bucket != "" {
s.bucket = bucket
mc, err := minio.New(os.Getenv("AWS_ENDPOINT"), &minio.Options{
if s.c.AwsS3BucketName != "" {
mc, err := minio.New(s.c.AwsEndpoint, &minio.Options{
Creds: credentials.NewStaticV4(
os.Getenv("AWS_ACCESS_KEY_ID"),
os.Getenv("AWS_SECRET_ACCESS_KEY"),
s.c.AwsAccessKeyID,
s.c.AwsSecretAccessKey,
"",
),
Secure: os.Getenv("AWS_ENDPOINT_INSECURE") == "" && os.Getenv("AWS_ENDPOINT_PROTO") == "https",
Secure: !s.c.AwsEndpointInsecure && s.c.AwsEndpointProto == "https",
})
if err != nil {
return fmt.Errorf("init: error setting up minio client: %w", err)
@ -101,32 +109,7 @@ func (s *script) init() error {
s.mc = mc
}
file := os.Getenv("BACKUP_FILENAME")
if file == "" {
return errors.New("init: BACKUP_FILENAME not given")
}
s.file = path.Join("/tmp", file)
s.archive = os.Getenv("BACKUP_ARCHIVE")
s.sources = os.Getenv("BACKUP_SOURCES")
if v := os.Getenv("GPG_PASSPHRASE"); v != "" {
s.passphrase = []byte(v)
}
if v := os.Getenv("BACKUP_RETENTION_DAYS"); v != "" {
i, err := strconv.Atoi(v)
if err != nil {
return fmt.Errorf("init: error parsing BACKUP_RETENTION_DAYS as int: %w", err)
}
s.retentionDays = &i
}
if v := os.Getenv("BACKUP_PRUNING_LEEWAY"); v != "" {
d, err := time.ParseDuration(v)
if err != nil {
return fmt.Errorf("init: error parsing BACKUP_PRUNING_LEEWAY as duration: %w", err)
}
s.leeway = &d
}
s.containerLabel = os.Getenv("BACKUP_STOP_CONTAINER_LABEL")
s.pruningPrefix = os.Getenv("BACKUP_PRUNING_PREFIX")
s.file = path.Join("/tmp", s.c.BackupFilename)
s.start = time.Now()
return nil
@ -134,7 +117,8 @@ func (s *script) init() error {
// stopContainersAndRun stops all Docker containers that are marked as to being
// stopped during the backup and runs the given thunk. After returning, it makes
// sure containers are being restarted if required.
// sure containers are being restarted if required. In case the docker cli
// is not configured, it will call the given thunk immediately.
func (s *script) stopContainersAndRun(thunk func() error) error {
if s.cli == nil {
return thunk()
@ -149,7 +133,7 @@ func (s *script) stopContainersAndRun(thunk func() error) error {
containerLabel := fmt.Sprintf(
"docker-volume-backup.stop-during-backup=%s",
s.containerLabel,
s.c.BackupStopContainerLabel,
)
containersToStop, err := s.cli.ContainerList(s.ctx, types.ContainerListOptions{
Quiet: true,
@ -251,10 +235,10 @@ func (s *script) stopContainersAndRun(thunk func() error) error {
// saves it to disk.
func (s *script) takeBackup() error {
s.file = timeutil.Strftime(&s.start, s.file)
if err := targz.Compress(s.sources, s.file); err != nil {
if err := targz.Compress(s.c.BackupSources, s.file); err != nil {
return fmt.Errorf("takeBackup: error compressing backup folder: %w", err)
}
s.logger.Infof("Created backup of `%s` at `%s`.", s.sources, s.file)
s.logger.Infof("Created backup of `%s` at `%s`.", s.c.BackupSources, s.file)
return nil
}
@ -262,7 +246,7 @@ func (s *script) takeBackup() error {
// In case no passphrase is given it returns early, leaving the backup file
// untouched.
func (s *script) encryptBackup() error {
if s.passphrase == nil {
if s.c.GpgPassphrase == "" {
return nil
}
@ -274,7 +258,7 @@ func (s *script) encryptBackup() error {
}
_, name := path.Split(s.file)
dst, err := openpgp.SymmetricallyEncrypt(outFile, []byte(s.passphrase), &openpgp.FileHints{
dst, err := openpgp.SymmetricallyEncrypt(outFile, []byte(s.c.GpgPassphrase), &openpgp.FileHints{
IsBinary: true,
FileName: name,
}, nil)
@ -305,21 +289,21 @@ func (s *script) encryptBackup() error {
// as per the given configuration.
func (s *script) copyBackup() error {
_, name := path.Split(s.file)
if s.bucket != "" {
_, err := s.mc.FPutObject(s.ctx, s.bucket, name, s.file, minio.PutObjectOptions{
if s.c.AwsS3BucketName != "" {
_, err := s.mc.FPutObject(s.ctx, s.c.AwsS3BucketName, name, s.file, minio.PutObjectOptions{
ContentType: "application/tar+gzip",
})
if err != nil {
return fmt.Errorf("copyBackup: error uploading backup to remote storage: %w", err)
}
s.logger.Infof("Uploaded a copy of backup `%s` to bucket `%s`", s.file, s.bucket)
s.logger.Infof("Uploaded a copy of backup `%s` to bucket `%s`", s.file, s.c.AwsS3BucketName)
}
if _, err := os.Stat(s.archive); !os.IsNotExist(err) {
if err := copy(s.file, path.Join(s.archive, name)); err != nil {
if _, err := os.Stat(s.c.BackupArchive); !os.IsNotExist(err) {
if err := copy(s.file, path.Join(s.c.BackupArchive, name)); err != nil {
return fmt.Errorf("copyBackup: error copying file to local archive: %w", err)
}
s.logger.Infof("Stored copy of backup `%s` in local archive `%s`", s.file, s.archive)
s.logger.Infof("Stored copy of backup `%s` in local archive `%s`", s.file, s.c.AwsS3BucketName)
}
return nil
}
@ -337,22 +321,22 @@ func (s *script) cleanBackup() error {
// the given configuration. In case the given configuration would delete all
// backups, it does nothing instead.
func (s *script) pruneOldBackups() error {
if s.retentionDays == nil {
if s.c.BackupRetentionDays < 0 {
return nil
}
if s.leeway != nil {
s.logger.Infof("Sleeping for %s before pruning backups.", s.leeway)
time.Sleep(*s.leeway)
if s.c.BackupPruningLeeway != 0 {
s.logger.Infof("Sleeping for %s before pruning backups.", s.c.BackupPruningLeeway)
time.Sleep(s.c.BackupPruningLeeway)
}
s.logger.Infof("Trying to prune backups older than %d day(s) now.", *s.retentionDays)
deadline := s.start.AddDate(0, 0, -*s.retentionDays)
s.logger.Infof("Trying to prune backups older than %d day(s) now.", s.c.BackupRetentionDays)
deadline := s.start.AddDate(0, 0, -int(s.c.BackupRetentionDays))
if s.bucket != "" {
candidates := s.mc.ListObjects(s.ctx, s.bucket, minio.ListObjectsOptions{
if s.c.AwsS3BucketName != "" {
candidates := s.mc.ListObjects(s.ctx, s.c.AwsS3BucketName, minio.ListObjectsOptions{
WithMetadata: true,
Prefix: s.pruningPrefix,
Prefix: s.c.BackupPruningPrefix,
})
var matches []minio.ObjectInfo
@ -378,7 +362,7 @@ func (s *script) pruneOldBackups() error {
}
close(objectsCh)
}()
errChan := s.mc.RemoveObjects(s.ctx, s.bucket, objectsCh, minio.RemoveObjectsOptions{})
errChan := s.mc.RemoveObjects(s.ctx, s.c.AwsS3BucketName, objectsCh, minio.RemoveObjectsOptions{})
var errors []error
for result := range errChan {
if result.Err != nil {
@ -409,9 +393,9 @@ func (s *script) pruneOldBackups() error {
}
}
if _, err := os.Stat(s.archive); !os.IsNotExist(err) {
if _, err := os.Stat(s.c.BackupArchive); !os.IsNotExist(err) {
candidates, err := filepath.Glob(
path.Join(s.archive, fmt.Sprintf("%s*", s.pruningPrefix)),
path.Join(s.c.BackupArchive, fmt.Sprintf("%s*", s.c.BackupPruningPrefix)),
)
if err != nil {
return fmt.Errorf(

25
entrypoint.sh
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@ -3,37 +3,12 @@
# Copyright 2021 - Offen Authors <hioffen@posteo.de>
# SPDX-License-Identifier: MPL-2.0
# Portions of this file are taken from github.com/futurice/docker-volume-backup
# See NOTICE for information about authors and licensing.
set -e
# Write cronjob env to file, fill in sensible defaults, and read them back in
cat <<EOF > /etc/backup.env
BACKUP_SOURCES="${BACKUP_SOURCES:-/backup}"
BACKUP_CRON_EXPRESSION="${BACKUP_CRON_EXPRESSION:-@daily}"
BACKUP_FILENAME="${BACKUP_FILENAME:-backup-%Y-%m-%dT%H-%M-%S.tar.gz}"
BACKUP_ARCHIVE="${BACKUP_ARCHIVE:-/archive}"
BACKUP_RETENTION_DAYS="${BACKUP_RETENTION_DAYS:-}"
BACKUP_PRUNING_LEEWAY="${BACKUP_PRUNING_LEEWAY:-1m}"
BACKUP_PRUNING_PREFIX="${BACKUP_PRUNING_PREFIX:-}"
BACKUP_STOP_CONTAINER_LABEL="${BACKUP_STOP_CONTAINER_LABEL:-true}"
AWS_S3_BUCKET_NAME="${AWS_S3_BUCKET_NAME:-}"
AWS_ENDPOINT="${AWS_ENDPOINT:-s3.amazonaws.com}"
AWS_ENDPOINT_PROTO="${AWS_ENDPOINT_PROTO:-https}"
AWS_ENDPOINT_INSECURE="${AWS_ENDPOINT_INSECURE:-}"
GPG_PASSPHRASE="${GPG_PASSPHRASE:-}"
EOF
chmod a+x /etc/backup.env
source /etc/backup.env
# Add our cron entry, and direct stdout & stderr to Docker commands stdout
echo "Installing cron.d entry with expression $BACKUP_CRON_EXPRESSION."
echo "$BACKUP_CRON_EXPRESSION backup 2>&1" | crontab -
# Let cron take the wheel
echo "Starting cron in foreground."
crond -f -l 8

2
go.mod
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@ -5,7 +5,7 @@ go 1.17
require (
github.com/docker/docker v20.10.8+incompatible
github.com/gofrs/flock v0.8.1
github.com/joho/godotenv v1.3.0
github.com/kelseyhightower/envconfig v1.4.0
github.com/leekchan/timeutil v0.0.0-20150802142658-28917288c48d
github.com/minio/minio-go/v7 v7.0.12
github.com/sirupsen/logrus v1.8.1

4
go.sum
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@ -372,8 +372,6 @@ github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANyt
github.com/j-keck/arping v0.0.0-20160618110441-2cf9dc699c56/go.mod h1:ymszkNOg6tORTn+6F6j+Jc8TOr5osrynvN6ivFWZ2GA=
github.com/jmespath/go-jmespath v0.0.0-20160202185014-0b12d6b521d8/go.mod h1:Nht3zPeWKUH0NzdCt2Blrr5ys8VGpn0CEB0cQHVjt7k=
github.com/jmespath/go-jmespath v0.0.0-20160803190731-bd40a432e4c7/go.mod h1:Nht3zPeWKUH0NzdCt2Blrr5ys8VGpn0CEB0cQHVjt7k=
github.com/joho/godotenv v1.3.0 h1:Zjp+RcGpHhGlrMbJzXTrZZPrWj+1vfm90La1wgB6Bhc=
github.com/joho/godotenv v1.3.0/go.mod h1:7hK45KPybAkOC6peb+G5yklZfMxEjkZhHbwpqxOKXbg=
github.com/jonboulle/clockwork v0.1.0/go.mod h1:Ii8DK3G1RaLaWxj9trq07+26W01tbo22gdxWY5EU2bo=
github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
github.com/json-iterator/go v1.1.7/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
@ -384,6 +382,8 @@ github.com/jstemmer/go-junit-report v0.9.1/go.mod h1:Brl9GWCQeLvo8nXZwPNNblvFj/X
github.com/jtolds/gls v4.20.0+incompatible h1:xdiiI2gbIgH/gLH7ADydsJ1uDOEzR8yvV7C0MuV77Wo=
github.com/jtolds/gls v4.20.0+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU=
github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w=
github.com/kelseyhightower/envconfig v1.4.0 h1:Im6hONhd3pLkfDFsbRgu68RDNkGF1r3dvMUtDTo2cv8=
github.com/kelseyhightower/envconfig v1.4.0/go.mod h1:cccZRl6mQpaq41TPp5QxidR+Sa3axMbJDNb//FQX6Gg=
github.com/kisielk/errcheck v1.1.0/go.mod h1:EZBBE59ingxPouuu3KfxchcWSUPOHkagtvWXihfKN4Q=
github.com/kisielk/errcheck v1.2.0/go.mod h1:/BMXB+zMLi60iA8Vv6Ksmxu/1UDYcXs4uQLJ+jE2L00=
github.com/kisielk/errcheck v1.5.0/go.mod h1:pFxgyoBC7bSaBwPgfKdkLd5X25qrDl4LWUI2bnpBCr8=

1
test/compose/docker-compose.yml
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@ -41,7 +41,6 @@ services:
volumes:
- app_data:/var/opt/offen
volumes:
backup_data:
app_data: