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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
View File

@ -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 ( import (
"context" "context"
"errors"
"fmt" "fmt"
"io" "io"
"os" "os"
"path" "path"
"path/filepath" "path/filepath"
"strconv"
"time" "time"
"github.com/docker/docker/api/types" "github.com/docker/docker/api/types"
@ -19,7 +17,7 @@ import (
"github.com/docker/docker/api/types/swarm" "github.com/docker/docker/api/types/swarm"
"github.com/docker/docker/client" "github.com/docker/docker/client"
"github.com/gofrs/flock" "github.com/gofrs/flock"
"github.com/joho/godotenv" "github.com/kelseyhightower/envconfig"
"github.com/leekchan/timeutil" "github.com/leekchan/timeutil"
minio "github.com/minio/minio-go/v7" minio "github.com/minio/minio-go/v7"
"github.com/minio/minio-go/v7/pkg/credentials" "github.com/minio/minio-go/v7/pkg/credentials"
@ -29,7 +27,7 @@ import (
) )
func main() { func main() {
unlock := lock("/var/dockervolumebackup.lock") unlock := lock("/var/lock/dockervolumebackup.lock")
defer unlock() defer unlock()
s := &script{} s := &script{}
@ -51,16 +49,26 @@ type script struct {
logger *logrus.Logger logger *logrus.Logger
start time.Time start time.Time
file string
file string c *config
bucket string }
archive string
sources string type config struct {
passphrase []byte BackupSources string `split_words:"true" default:"/backup"`
retentionDays *int BackupFilename string `split_words:"true" default:"backup-%Y-%m-%dT%H-%M-%S.tar.gz"`
leeway *time.Duration BackupArchive string `split_words:"true" default:"/archive"`
containerLabel string BackupRetentionDays int32 `split_words:"true" default:"-1"`
pruningPrefix string 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 // 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 = logrus.New()
s.logger.SetOutput(os.Stdout) s.logger.SetOutput(os.Stdout)
if err := godotenv.Load("/etc/backup.env"); err != nil { s.c = &config{}
return fmt.Errorf("init: failed to load env file: %w", err) 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") _, err := os.Stat("/var/run/docker.sock")
@ -85,15 +94,14 @@ func (s *script) init() error {
s.cli = cli s.cli = cli
} }
if bucket := os.Getenv("AWS_S3_BUCKET_NAME"); bucket != "" { if s.c.AwsS3BucketName != "" {
s.bucket = bucket mc, err := minio.New(s.c.AwsEndpoint, &minio.Options{
mc, err := minio.New(os.Getenv("AWS_ENDPOINT"), &minio.Options{
Creds: credentials.NewStaticV4( Creds: credentials.NewStaticV4(
os.Getenv("AWS_ACCESS_KEY_ID"), s.c.AwsAccessKeyID,
os.Getenv("AWS_SECRET_ACCESS_KEY"), 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 { if err != nil {
return fmt.Errorf("init: error setting up minio client: %w", err) return fmt.Errorf("init: error setting up minio client: %w", err)
@ -101,32 +109,7 @@ func (s *script) init() error {
s.mc = mc s.mc = mc
} }
file := os.Getenv("BACKUP_FILENAME") s.file = path.Join("/tmp", s.c.BackupFilename)
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.start = time.Now() s.start = time.Now()
return nil return nil
@ -134,7 +117,8 @@ func (s *script) init() error {
// stopContainersAndRun stops all Docker containers that are marked as to being // stopContainersAndRun stops all Docker containers that are marked as to being
// stopped during the backup and runs the given thunk. After returning, it makes // 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 { func (s *script) stopContainersAndRun(thunk func() error) error {
if s.cli == nil { if s.cli == nil {
return thunk() return thunk()
@ -149,7 +133,7 @@ func (s *script) stopContainersAndRun(thunk func() error) error {
containerLabel := fmt.Sprintf( containerLabel := fmt.Sprintf(
"docker-volume-backup.stop-during-backup=%s", "docker-volume-backup.stop-during-backup=%s",
s.containerLabel, s.c.BackupStopContainerLabel,
) )
containersToStop, err := s.cli.ContainerList(s.ctx, types.ContainerListOptions{ containersToStop, err := s.cli.ContainerList(s.ctx, types.ContainerListOptions{
Quiet: true, Quiet: true,
@ -251,10 +235,10 @@ func (s *script) stopContainersAndRun(thunk func() error) error {
// saves it to disk. // saves it to disk.
func (s *script) takeBackup() error { func (s *script) takeBackup() error {
s.file = timeutil.Strftime(&s.start, s.file) 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) 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 return nil
} }
@ -262,7 +246,7 @@ func (s *script) takeBackup() error {
// In case no passphrase is given it returns early, leaving the backup file // In case no passphrase is given it returns early, leaving the backup file
// untouched. // untouched.
func (s *script) encryptBackup() error { func (s *script) encryptBackup() error {
if s.passphrase == nil { if s.c.GpgPassphrase == "" {
return nil return nil
} }
@ -274,7 +258,7 @@ func (s *script) encryptBackup() error {
} }
_, name := path.Split(s.file) _, 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, IsBinary: true,
FileName: name, FileName: name,
}, nil) }, nil)
@ -305,21 +289,21 @@ func (s *script) encryptBackup() error {
// as per the given configuration. // as per the given configuration.
func (s *script) copyBackup() error { func (s *script) copyBackup() error {
_, name := path.Split(s.file) _, name := path.Split(s.file)
if s.bucket != "" { if s.c.AwsS3BucketName != "" {
_, err := s.mc.FPutObject(s.ctx, s.bucket, name, s.file, minio.PutObjectOptions{ _, err := s.mc.FPutObject(s.ctx, s.c.AwsS3BucketName, name, s.file, minio.PutObjectOptions{
ContentType: "application/tar+gzip", ContentType: "application/tar+gzip",
}) })
if err != nil { if err != nil {
return fmt.Errorf("copyBackup: error uploading backup to remote storage: %w", err) 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 := os.Stat(s.c.BackupArchive); !os.IsNotExist(err) {
if err := copy(s.file, path.Join(s.archive, name)); err != nil { 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) 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 return nil
} }
@ -337,22 +321,22 @@ func (s *script) cleanBackup() error {
// the given configuration. In case the given configuration would delete all // the given configuration. In case the given configuration would delete all
// backups, it does nothing instead. // backups, it does nothing instead.
func (s *script) pruneOldBackups() error { func (s *script) pruneOldBackups() error {
if s.retentionDays == nil { if s.c.BackupRetentionDays < 0 {
return nil return nil
} }
if s.leeway != nil { if s.c.BackupPruningLeeway != 0 {
s.logger.Infof("Sleeping for %s before pruning backups.", s.leeway) s.logger.Infof("Sleeping for %s before pruning backups.", s.c.BackupPruningLeeway)
time.Sleep(*s.leeway) time.Sleep(s.c.BackupPruningLeeway)
} }
s.logger.Infof("Trying to prune backups older than %d day(s) now.", *s.retentionDays) s.logger.Infof("Trying to prune backups older than %d day(s) now.", s.c.BackupRetentionDays)
deadline := s.start.AddDate(0, 0, -*s.retentionDays) deadline := s.start.AddDate(0, 0, -int(s.c.BackupRetentionDays))
if s.bucket != "" { if s.c.AwsS3BucketName != "" {
candidates := s.mc.ListObjects(s.ctx, s.bucket, minio.ListObjectsOptions{ candidates := s.mc.ListObjects(s.ctx, s.c.AwsS3BucketName, minio.ListObjectsOptions{
WithMetadata: true, WithMetadata: true,
Prefix: s.pruningPrefix, Prefix: s.c.BackupPruningPrefix,
}) })
var matches []minio.ObjectInfo var matches []minio.ObjectInfo
@ -378,7 +362,7 @@ func (s *script) pruneOldBackups() error {
} }
close(objectsCh) 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 var errors []error
for result := range errChan { for result := range errChan {
if result.Err != nil { 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( 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 { if err != nil {
return fmt.Errorf( return fmt.Errorf(

25
entrypoint.sh
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@ -3,37 +3,12 @@
# Copyright 2021 - Offen Authors <hioffen@posteo.de> # Copyright 2021 - Offen Authors <hioffen@posteo.de>
# SPDX-License-Identifier: MPL-2.0 # 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 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_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 "Installing cron.d entry with expression $BACKUP_CRON_EXPRESSION."
echo "$BACKUP_CRON_EXPRESSION backup 2>&1" | crontab - echo "$BACKUP_CRON_EXPRESSION backup 2>&1" | crontab -
# Let cron take the wheel
echo "Starting cron in foreground." echo "Starting cron in foreground."
crond -f -l 8 crond -f -l 8

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

4
go.sum
View File

@ -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/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 v0.0.0-20160202185014-0b12d6b521d8/go.mod h1:Nht3zPeWKUH0NzdCt2Blrr5ys8VGpn0CEB0cQHVjt7k=
github.com/jmespath/go-jmespath v0.0.0-20160803190731-bd40a432e4c7/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/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 v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
github.com/json-iterator/go v1.1.7/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4= 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 h1:xdiiI2gbIgH/gLH7ADydsJ1uDOEzR8yvV7C0MuV77Wo=
github.com/jtolds/gls v4.20.0+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU= 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/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 v1.1.0/go.mod h1:EZBBE59ingxPouuu3KfxchcWSUPOHkagtvWXihfKN4Q=
github.com/kisielk/errcheck v1.2.0/go.mod h1:/BMXB+zMLi60iA8Vv6Ksmxu/1UDYcXs4uQLJ+jE2L00= github.com/kisielk/errcheck v1.2.0/go.mod h1:/BMXB+zMLi60iA8Vv6Ksmxu/1UDYcXs4uQLJ+jE2L00=
github.com/kisielk/errcheck v1.5.0/go.mod h1:pFxgyoBC7bSaBwPgfKdkLd5X25qrDl4LWUI2bnpBCr8= github.com/kisielk/errcheck v1.5.0/go.mod h1:pFxgyoBC7bSaBwPgfKdkLd5X25qrDl4LWUI2bnpBCr8=

1
test/compose/docker-compose.yml
View File

@ -41,7 +41,6 @@ services:
volumes: volumes:
- app_data:/var/opt/offen - app_data:/var/opt/offen
volumes: volumes:
backup_data: backup_data:
app_data: app_data: