mirror of
https://github.com/offen/docker-volume-backup.git
synced 2024-09-19 21:20:28 +02:00
216 lines
8.2 KiB
Go
216 lines
8.2 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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"crypto/x509"
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"encoding/pem"
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"fmt"
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"os"
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"regexp"
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"strconv"
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"time"
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"github.com/offen/docker-volume-backup/internal/errwrap"
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)
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// Config holds all configuration values that are expected to be set
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// by users.
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type Config struct {
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AwsS3BucketName string `split_words:"true"`
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AwsS3Path string `split_words:"true"`
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AwsEndpoint string `split_words:"true" default:"s3.amazonaws.com"`
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AwsEndpointProto string `split_words:"true" default:"https"`
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AwsEndpointInsecure bool `split_words:"true"`
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AwsEndpointCACert CertDecoder `envconfig:"AWS_ENDPOINT_CA_CERT"`
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AwsStorageClass string `split_words:"true"`
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AwsAccessKeyID string `envconfig:"AWS_ACCESS_KEY_ID"`
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AwsSecretAccessKey string `split_words:"true"`
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AwsIamRoleEndpoint string `split_words:"true"`
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AwsPartSize int64 `split_words:"true"`
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BackupCompression CompressionType `split_words:"true" default:"gz"`
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GzipParallelism WholeNumber `split_words:"true" default:"1"`
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BackupSources string `split_words:"true" default:"/backup"`
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BackupFilename string `split_words:"true" default:"backup-%Y-%m-%dT%H-%M-%S.{{ .Extension }}"`
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BackupFilenameExpand bool `split_words:"true"`
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BackupLatestSymlink string `split_words:"true"`
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BackupArchive string `split_words:"true" default:"/archive"`
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BackupCronExpression string `split_words:"true" default:"@daily"`
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BackupRetentionDays int32 `split_words:"true" default:"-1"`
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BackupPruningLeeway time.Duration `split_words:"true" default:"1m"`
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BackupPruningPrefix string `split_words:"true"`
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BackupStopContainerLabel string `split_words:"true"`
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BackupStopDuringBackupLabel string `split_words:"true" default:"true"`
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BackupStopServiceTimeout time.Duration `split_words:"true" default:"5m"`
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BackupFromSnapshot bool `split_words:"true"`
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BackupExcludeRegexp RegexpDecoder `split_words:"true"`
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BackupSkipBackendsFromPrune []string `split_words:"true"`
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GpgPassphrase string `split_words:"true"`
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NotificationURLs []string `envconfig:"NOTIFICATION_URLS"`
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NotificationLevel string `split_words:"true" default:"error"`
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EmailNotificationRecipient string `split_words:"true"`
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EmailNotificationSender string `split_words:"true" default:"noreply@nohost"`
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EmailSMTPHost string `envconfig:"EMAIL_SMTP_HOST"`
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EmailSMTPPort int `envconfig:"EMAIL_SMTP_PORT" default:"587"`
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EmailSMTPUsername string `envconfig:"EMAIL_SMTP_USERNAME"`
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EmailSMTPPassword string `envconfig:"EMAIL_SMTP_PASSWORD"`
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WebdavUrl string `split_words:"true"`
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WebdavUrlInsecure bool `split_words:"true"`
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WebdavPath string `split_words:"true" default:"/"`
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WebdavUsername string `split_words:"true"`
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WebdavPassword string `split_words:"true"`
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SSHHostName string `split_words:"true"`
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SSHPort string `split_words:"true" default:"22"`
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SSHUser string `split_words:"true"`
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SSHPassword string `split_words:"true"`
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SSHIdentityFile string `split_words:"true" default:"/root/.ssh/id_rsa"`
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SSHIdentityPassphrase string `split_words:"true"`
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SSHRemotePath string `split_words:"true"`
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ExecLabel string `split_words:"true"`
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ExecForwardOutput bool `split_words:"true"`
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LockTimeout time.Duration `split_words:"true" default:"60m"`
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AzureStorageAccountName string `split_words:"true"`
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AzureStoragePrimaryAccountKey string `split_words:"true"`
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AzureStorageContainerName string `split_words:"true"`
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AzureStoragePath string `split_words:"true"`
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AzureStorageEndpoint string `split_words:"true" default:"https://{{ .AccountName }}.blob.core.windows.net/"`
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DropboxEndpoint string `split_words:"true" default:"https://api.dropbox.com/"`
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DropboxOAuth2Endpoint string `envconfig:"DROPBOX_OAUTH2_ENDPOINT" default:"https://api.dropbox.com/"`
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DropboxRefreshToken string `split_words:"true"`
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DropboxAppKey string `split_words:"true"`
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DropboxAppSecret string `split_words:"true"`
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DropboxRemotePath string `split_words:"true"`
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DropboxConcurrencyLevel NaturalNumber `split_words:"true" default:"6"`
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source string
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additionalEnvVars map[string]string
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}
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type CompressionType string
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func (c *CompressionType) Decode(v string) error {
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switch v {
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case "gz", "zst":
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*c = CompressionType(v)
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return nil
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default:
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return errwrap.Wrap(nil, fmt.Sprintf("error decoding compression type %s", v))
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}
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}
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func (c *CompressionType) String() string {
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return string(*c)
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}
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type CertDecoder struct {
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Cert *x509.Certificate
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}
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func (c *CertDecoder) Decode(v string) error {
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if v == "" {
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return nil
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}
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content, err := os.ReadFile(v)
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if err != nil {
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content = []byte(v)
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}
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block, _ := pem.Decode(content)
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cert, err := x509.ParseCertificate(block.Bytes)
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if err != nil {
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return errwrap.Wrap(err, "error parsing certificate")
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}
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*c = CertDecoder{Cert: cert}
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return nil
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}
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type RegexpDecoder struct {
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Re *regexp.Regexp
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}
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func (r *RegexpDecoder) Decode(v string) error {
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if v == "" {
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return nil
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}
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re, err := regexp.Compile(v)
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if err != nil {
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return errwrap.Wrap(err, fmt.Sprintf("error compiling given regexp `%s`", v))
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}
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*r = RegexpDecoder{Re: re}
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return nil
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}
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// NaturalNumber is a type that can be used to decode a positive, non-zero natural number
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type NaturalNumber int
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func (n *NaturalNumber) Decode(v string) error {
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asInt, err := strconv.Atoi(v)
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if err != nil {
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return errwrap.Wrap(nil, fmt.Sprintf("error converting %s to int", v))
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}
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if asInt <= 0 {
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return errwrap.Wrap(nil, fmt.Sprintf("expected a natural number, got %d", asInt))
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}
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*n = NaturalNumber(asInt)
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return nil
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}
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func (n *NaturalNumber) Int() int {
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return int(*n)
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}
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// WholeNumber is a type that can be used to decode a positive whole number, including zero
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type WholeNumber int
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func (n *WholeNumber) Decode(v string) error {
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asInt, err := strconv.Atoi(v)
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if err != nil {
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return errwrap.Wrap(nil, fmt.Sprintf("error converting %s to int", v))
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}
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if asInt < 0 {
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return errwrap.Wrap(nil, fmt.Sprintf("expected a whole, positive number, including zero. Got %d", asInt))
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}
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*n = WholeNumber(asInt)
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return nil
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}
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func (n *WholeNumber) Int() int {
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return int(*n)
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}
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type envVarLookup struct {
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ok bool
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key string
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value string
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}
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// applyEnv sets the values in `additionalEnvVars` as environment variables.
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// It returns a function that reverts all values that have been set to its
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// previous state.
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func (c *Config) applyEnv() (func() error, error) {
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lookups := []envVarLookup{}
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unset := func() error {
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for _, lookup := range lookups {
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if !lookup.ok {
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if err := os.Unsetenv(lookup.key); err != nil {
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return errwrap.Wrap(err, fmt.Sprintf("error unsetting env var %s", lookup.key))
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}
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continue
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}
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if err := os.Setenv(lookup.key, lookup.value); err != nil {
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return errwrap.Wrap(err, fmt.Sprintf("error setting back env var %s", lookup.key))
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}
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}
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return nil
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}
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for key, value := range c.additionalEnvVars {
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current, ok := os.LookupEnv(key)
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lookups = append(lookups, envVarLookup{ok: ok, key: key, value: current})
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if err := os.Setenv(key, value); err != nil {
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return unset, errwrap.Wrap(err, "error setting env var")
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}
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}
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return unset, nil
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}
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