368 lines
9.1 KiB
Go
368 lines
9.1 KiB
Go
package main
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import (
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"encoding/json"
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"errors"
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"fmt"
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"log"
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"os"
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"os/exec"
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"strings"
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"time"
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)
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var ErrRestic = errors.New("restic error")
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var ErrRepoNotFound = errors.New("repository not found or uninitialized")
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func lineIn(needle string, haystack []string) bool {
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for _, line := range haystack {
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if line == needle {
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return true
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}
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}
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return false
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}
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func maybeAddArgString(args []string, name, value string) []string {
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if value != "" {
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return append(args, name, value)
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}
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return args
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}
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func maybeAddArgInt(args []string, name string, value int) []string {
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if value > 0 {
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return append(args, name, fmt.Sprint(value))
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}
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return args
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}
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func maybeAddArgBool(args []string, name string, value bool) []string {
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if value {
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return append(args, name)
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}
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return args
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}
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func maybeAddArgsList(args []string, name string, value []string) []string {
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for _, v := range value {
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args = append(args, name, v)
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}
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return args
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}
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type CommandOptions interface {
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ToArgs() []string
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}
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type GenericOpts []string
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func (o GenericOpts) ToArgs() []string {
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return o
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}
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type NoOpts struct{}
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func (NoOpts) ToArgs() []string {
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return []string{}
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}
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type BackupOpts struct {
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Exclude []string `hcl:"Exclude,optional"`
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Include []string `hcl:"Include,optional"`
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Tags []string `hcl:"Tags,optional"`
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Host string `hcl:"Host,optional"`
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}
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func (bo BackupOpts) ToArgs() (args []string) {
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args = maybeAddArgsList(args, "--exclude", bo.Exclude)
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args = maybeAddArgsList(args, "--include", bo.Include)
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args = maybeAddArgsList(args, "--tag", bo.Tags)
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args = maybeAddArgString(args, "--host", bo.Host)
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return
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}
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type RestoreOpts struct {
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Exclude []string `hcl:"Exclude,optional"`
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Include []string `hcl:"Include,optional"`
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Host []string `hcl:"Host,optional"`
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Tags []string `hcl:"Tags,optional"`
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Path string `hcl:"Path,optional"`
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Target string `hcl:"Target,optional"`
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Verify bool `hcl:"Verify,optional"`
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}
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func (ro RestoreOpts) ToArgs() (args []string) {
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args = maybeAddArgsList(args, "--exclude", ro.Exclude)
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args = maybeAddArgsList(args, "--include", ro.Include)
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args = maybeAddArgsList(args, "--host", ro.Host)
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args = maybeAddArgsList(args, "--tag", ro.Tags)
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args = maybeAddArgString(args, "--path", ro.Path)
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args = maybeAddArgString(args, "--target", ro.Target)
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args = maybeAddArgBool(args, "--verify", ro.Verify)
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return
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}
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type TagList []string
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func (t TagList) String() string {
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return strings.Join(t, ",")
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}
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type ForgetOpts struct {
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KeepLast int `hcl:"KeepLast,optional"`
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KeepHourly int `hcl:"KeepHourly,optional"`
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KeepDaily int `hcl:"KeepDaily,optional"`
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KeepWeekly int `hcl:"KeepWeekly,optional"`
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KeepMonthly int `hcl:"KeepMonthly,optional"`
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KeepYearly int `hcl:"KeepYearly,optional"`
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KeepWithin time.Duration `hcl:"KeepWithin,optional"`
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KeepWithinHourly time.Duration `hcl:"KeepWithinHourly,optional"`
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KeepWithinDaily time.Duration `hcl:"KeepWithinDaily,optional"`
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KeepWithinWeekly time.Duration `hcl:"KeepWithinWeekly,optional"`
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KeepWithinMonthly time.Duration `hcl:"KeepWithinMonthly,optional"`
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KeepWithinYearly time.Duration `hcl:"KeepWithinYearly,optional"`
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Tags []TagList `hcl:"Tags,optional"`
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KeepTags []TagList `hcl:"KeepTags,optional"`
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Prune bool `hcl:"Prune,optional"`
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}
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func (fo ForgetOpts) ToArgs() (args []string) {
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args = maybeAddArgInt(args, "--keep-last", fo.KeepLast)
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args = maybeAddArgInt(args, "--keep-hourly", fo.KeepHourly)
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args = maybeAddArgInt(args, "--keep-daily", fo.KeepDaily)
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args = maybeAddArgInt(args, "--keep-weekly", fo.KeepWeekly)
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args = maybeAddArgInt(args, "--keep-monthly", fo.KeepMonthly)
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args = maybeAddArgInt(args, "--keep-yearly", fo.KeepYearly)
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// Add keep-within-*
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if fo.KeepWithin > 0 {
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args = append(args, "--keep-within", fo.KeepWithin.String())
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}
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if fo.KeepWithinHourly > 0 {
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args = append(args, "--keep-within-hourly", fo.KeepWithinHourly.String())
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}
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if fo.KeepWithinDaily > 0 {
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args = append(args, "--keep-within-daily", fo.KeepWithinDaily.String())
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}
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if fo.KeepWithinWeekly > 0 {
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args = append(args, "--keep-within-weekly", fo.KeepWithinWeekly.String())
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}
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if fo.KeepWithinMonthly > 0 {
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args = append(args, "--keep-within-monthly", fo.KeepWithinMonthly.String())
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}
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if fo.KeepWithinYearly > 0 {
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args = append(args, "--keep-within-yearly", fo.KeepWithinYearly.String())
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}
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// Add tags
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for _, tagList := range fo.Tags {
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args = append(args, "--tag", tagList.String())
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}
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for _, tagList := range fo.KeepTags {
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args = append(args, "--keep-tag", tagList.String())
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}
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// Add prune options
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args = maybeAddArgBool(args, "--prune", fo.Prune)
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return args
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}
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type ResticGlobalOpts struct {
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CaCertFile string `hcl:"CaCertFile,optional"`
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CacheDir string `hcl:"CacheDir,optional"`
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PasswordFile string `hcl:"PasswordFile,optional"`
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TLSClientCertFile string `hcl:"TlsClientCertFile,optional"`
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LimitDownload int `hcl:"LimitDownload,optional"`
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LimitUpload int `hcl:"LimitUpload,optional"`
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VerboseLevel int `hcl:"VerboseLevel,optional"`
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CleanupCache bool `hcl:"CleanupCache,optional"`
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NoCache bool `hcl:"NoCache,optional"`
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NoLock bool `hcl:"NoLock,optional"`
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}
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func (glo ResticGlobalOpts) ToArgs() (args []string) {
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args = maybeAddArgString(args, "--cacert", glo.CaCertFile)
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args = maybeAddArgString(args, "--cache-dir", glo.CacheDir)
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args = maybeAddArgString(args, "--password-file", glo.PasswordFile)
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args = maybeAddArgString(args, "--tls-client-cert", glo.TLSClientCertFile)
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args = maybeAddArgInt(args, "--limit-download", glo.LimitDownload)
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args = maybeAddArgInt(args, "--limit-upload", glo.LimitUpload)
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args = maybeAddArgInt(args, "--verbose", glo.VerboseLevel)
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args = maybeAddArgBool(args, "--cleanup-cache", glo.CleanupCache)
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args = maybeAddArgBool(args, "--no-cache", glo.NoCache)
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args = maybeAddArgBool(args, "--no-lock", glo.NoLock)
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return args
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}
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type Restic struct {
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Logger *log.Logger
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Repo string
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Env map[string]string
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Passphrase string
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GlobalOpts *ResticGlobalOpts
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Cwd string
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}
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func (rcmd Restic) BuildEnv() []string {
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if rcmd.Env == nil {
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rcmd.Env = map[string]string{}
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}
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if rcmd.Passphrase != "" {
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rcmd.Env["RESTIC_PASSWORD"] = rcmd.Passphrase
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}
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envList := os.Environ()
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for name, value := range rcmd.Env {
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envList = append(envList, fmt.Sprintf("%s=%s", name, value))
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}
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return envList
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}
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type ResticError struct {
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OriginalError error
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Command string
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Output []string
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}
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func NewResticError(command string, output []string, originalError error) *ResticError {
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return &ResticError{
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OriginalError: originalError,
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Command: command,
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Output: output,
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}
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}
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func (e *ResticError) Error() string {
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return fmt.Sprintf(
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"error running restic %s: %s\nOutput:\n%s",
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e.Command,
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e.OriginalError,
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strings.Join(e.Output, "\n"),
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)
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}
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func (e *ResticError) Unwrap() error {
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return e.OriginalError
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}
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func (rcmd Restic) RunRestic(command string, options CommandOptions, commandArgs ...string) ([]string, error) {
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args := []string{}
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if rcmd.GlobalOpts != nil {
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args = rcmd.GlobalOpts.ToArgs()
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}
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args = append(args, "--repo", rcmd.Repo, command)
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args = append(args, options.ToArgs()...)
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args = append(args, commandArgs...)
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cmd := exec.Command("restic", args...)
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output := NewCapturedLogWriter(rcmd.Logger)
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cmd.Stdout = output
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cmd.Stderr = output
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cmd.Env = rcmd.BuildEnv()
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cmd.Dir = rcmd.Cwd
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if err := cmd.Run(); err != nil {
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responseErr := ErrRestic
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if lineIn("Is there a repository at the following location?", output.Lines) {
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responseErr = ErrRepoNotFound
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}
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return output.Lines, NewResticError(command, output.Lines, responseErr)
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}
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return output.Lines, nil
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}
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func (rcmd Restic) Backup(files []string, opts BackupOpts) error {
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_, err := rcmd.RunRestic("backup", opts, files...)
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return err
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}
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func (rcmd Restic) Restore(snapshot string, opts RestoreOpts) error {
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_, err := rcmd.RunRestic("restore", opts, snapshot)
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return err
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}
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func (rcmd Restic) Forget(forgetOpts ForgetOpts) error {
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_, err := rcmd.RunRestic("forget", forgetOpts)
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return err
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}
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func (rcmd Restic) Check() error {
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_, err := rcmd.RunRestic("check", NoOpts{})
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return err
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}
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type Snapshot struct {
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UID int `json:"uid"`
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GID int `json:"gid"`
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Time time.Time `json:"time"`
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Tree string `json:"tree"`
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Hostname string `json:"hostname"`
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Username string `json:"username"`
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ID string `json:"id"`
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ShortID string `json:"short_id"` // nolint:tagliatelle
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Paths []string `json:"paths"`
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Tags []string `json:"tags,omitempty"`
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}
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func (rcmd Restic) ReadSnapshots() ([]Snapshot, error) {
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lines, err := rcmd.RunRestic("snapshots", GenericOpts{"--json"})
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if err != nil {
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return nil, err
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}
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snapshots := new([]Snapshot)
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if err = json.Unmarshal([]byte(lines[0]), snapshots); err != nil {
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return nil, fmt.Errorf("failed parsing snapshot results: %w", err)
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}
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return *snapshots, nil
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}
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func (rcmd Restic) Snapshots() error {
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_, err := rcmd.RunRestic("snapshots", NoOpts{})
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return err
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}
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func (rcmd Restic) EnsureInit() error {
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if err := rcmd.Snapshots(); errors.Is(err, ErrRepoNotFound) {
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_, err := rcmd.RunRestic("init", NoOpts{})
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return err
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}
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return nil
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}
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