autorestic/internal/location.go
2021-10-26 15:57:40 +02:00

349 lines
7.4 KiB
Go

package internal
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
"time"
"github.com/cupcakearmy/autorestic/internal/colors"
"github.com/cupcakearmy/autorestic/internal/lock"
"github.com/cupcakearmy/autorestic/internal/metadata"
"github.com/robfig/cron"
)
type LocationType string
const (
TypeLocal LocationType = "local"
TypeVolume LocationType = "volume"
VolumePrefix string = "volume:"
)
type HookArray = []string
type Hooks struct {
Before HookArray `yaml:"before,omitempty"`
After HookArray `yaml:"after,omitempty"`
Success HookArray `yaml:"success,omitempty"`
Failure HookArray `yaml:"failure,omitempty"`
}
type Options map[string]map[string][]interface{}
type Location struct {
name string `yaml:",omitempty"`
From string `yaml:"from,omitempty"`
To []string `yaml:"to,omitempty"`
Hooks Hooks `yaml:"hooks,omitempty"`
Cron string `yaml:"cron,omitempty"`
Options Options `yaml:"options,omitempty"`
}
func GetLocation(name string) (Location, bool) {
l, ok := GetConfig().Locations[name]
l.name = name
return l, ok
}
func (l Location) validate() error {
if l.From == "" {
return fmt.Errorf(`Location "%s" is missing "from" key`, l.name)
}
if l.getType() == TypeLocal {
if from, err := GetPathRelativeToConfig(l.From); err != nil {
return err
} else {
if stat, err := os.Stat(from); err != nil {
return err
} else {
if !stat.IsDir() {
return fmt.Errorf("\"%s\" is not valid directory for location \"%s\"", from, l.name)
}
}
}
}
if len(l.To) == 0 {
return fmt.Errorf(`Location "%s" has no "to" targets`, l.name)
}
// Check if backends are all valid
for _, to := range l.To {
_, ok := GetBackend(to)
if !ok {
return fmt.Errorf("invalid backend `%s`", to)
}
}
return nil
}
func ExecuteHooks(commands []string, options ExecuteOptions) error {
if len(commands) == 0 {
return nil
}
colors.Secondary.Println("\nRunning hooks")
for _, command := range commands {
colors.Body.Println("> " + command)
out, err := ExecuteCommand(options, "-c", command)
if err != nil {
colors.Error.Println(out)
return err
}
if VERBOSE {
colors.Faint.Println(out)
}
}
colors.Body.Println("")
return nil
}
func (l Location) getType() LocationType {
if strings.HasPrefix(l.From, VolumePrefix) {
return TypeVolume
}
return TypeLocal
}
func (l Location) getVolumeName() string {
return strings.TrimPrefix(l.From, VolumePrefix)
}
func (l Location) getPath() (string, error) {
t := l.getType()
switch t {
case TypeLocal:
if path, err := GetPathRelativeToConfig(l.From); err != nil {
return "", err
} else {
return path, nil
}
case TypeVolume:
return "/volume/" + l.name + "/" + l.getVolumeName(), nil
}
return "", fmt.Errorf("could not get path for location \"%s\"", l.name)
}
func (l Location) Backup(cron bool) []error {
var errors []error
colors.PrimaryPrint(" Backing up location \"%s\" ", l.name)
t := l.getType()
options := ExecuteOptions{
Command: "bash",
Envs: map[string]string{
"AUTORESTIC_LOCATION": l.name,
},
}
if err := l.validate(); err != nil {
errors = append(errors, err)
colors.Error.Print(err)
goto after
}
if t == TypeLocal {
dir, _ := GetPathRelativeToConfig(l.From)
colors.Faint.Printf("Executing under: \"%s\"\n", dir)
options.Dir = dir
}
// Hooks
if err := ExecuteHooks(l.Hooks.Before, options); err != nil {
errors = append(errors, err)
goto after
}
// Backup
for i, to := range l.To {
backend, _ := GetBackend(to)
colors.Secondary.Printf("Backend: %s\n", backend.name)
env, err := backend.getEnv()
if err != nil {
errors = append(errors, err)
continue
}
lFlags := getOptions(l.Options, "backup")
bFlags := getOptions(backend.Options, "backup")
cmd := []string{"backup"}
cmd = append(cmd, lFlags...)
cmd = append(cmd, bFlags...)
if cron {
cmd = append(cmd, "--tag", "cron")
}
cmd = append(cmd, ".")
backupOptions := ExecuteOptions{
Dir: options.Dir,
Envs: env,
}
var out string
switch t {
case TypeLocal:
out, err = ExecuteResticCommand(backupOptions, cmd...)
case TypeVolume:
out, err = backend.ExecDocker(l, cmd)
}
if err != nil {
colors.Error.Println(out)
errors = append(errors, err)
continue
}
md := metadata.ExtractMetadataFromBackupLog(out)
mdEnv := metadata.MakeEnvFromMetadata(&md)
for k, v := range mdEnv {
options.Envs[k+"_"+fmt.Sprint(i)] = v
options.Envs[k+"_"+strings.ToUpper(backend.name)] = v
}
if VERBOSE {
colors.Faint.Println(out)
}
}
// After hooks
if err := ExecuteHooks(l.Hooks.After, options); err != nil {
errors = append(errors, err)
}
after:
var commands []string
if len(errors) > 0 {
commands = l.Hooks.Failure
} else {
commands = l.Hooks.Success
}
if err := ExecuteHooks(commands, options); err != nil {
errors = append(errors, err)
}
colors.Success.Println("Done")
return errors
}
func (l Location) Forget(prune bool, dry bool) error {
colors.PrimaryPrint("Forgetting for location \"%s\"", l.name)
path, err := l.getPath()
if err != nil {
return err
}
for _, to := range l.To {
backend, _ := GetBackend(to)
colors.Secondary.Printf("For backend \"%s\"\n", backend.name)
env, err := backend.getEnv()
if err != nil {
return nil
}
options := ExecuteOptions{
Envs: env,
}
lFlags := getOptions(l.Options, "forget")
bFlags := getOptions(backend.Options, "forget")
cmd := []string{"forget", "--path", path}
if prune {
cmd = append(cmd, "--prune")
}
if dry {
cmd = append(cmd, "--dry-run")
}
cmd = append(cmd, lFlags...)
cmd = append(cmd, bFlags...)
out, err := ExecuteResticCommand(options, cmd...)
if VERBOSE {
colors.Faint.Println(out)
}
if err != nil {
return err
}
}
colors.Success.Println("Done")
return nil
}
func (l Location) hasBackend(backend string) bool {
for _, b := range l.To {
if b == backend {
return true
}
}
return false
}
func (l Location) Restore(to, from string, force bool) error {
if from == "" {
from = l.To[0]
} else if !l.hasBackend(from) {
return fmt.Errorf("invalid backend: \"%s\"", from)
}
to, err := filepath.Abs(to)
if err != nil {
return err
}
colors.PrimaryPrint("Restoring location \"%s\"", l.name)
backend, _ := GetBackend(from)
path, err := l.getPath()
if err != nil {
return nil
}
colors.Secondary.Println("Restoring lastest snapshot")
colors.Body.Printf("%s → %s.\n", from, path)
switch l.getType() {
case TypeLocal:
// Check if target is empty
if !force {
notEmptyError := fmt.Errorf("target %s is not empty", to)
_, err = os.Stat(to)
if err == nil {
files, err := ioutil.ReadDir(to)
if err != nil {
return err
}
if len(files) > 0 {
return notEmptyError
}
} else {
if !os.IsNotExist(err) {
return err
}
}
}
err = backend.Exec([]string{"restore", "--target", to, "--path", path, "latest"})
case TypeVolume:
_, err = backend.ExecDocker(l, []string{"restore", "--target", ".", "--path", path, "latest"})
}
if err != nil {
return err
}
colors.Success.Println("Done")
return nil
}
func (l Location) RunCron() error {
if l.Cron == "" {
return nil
}
schedule, err := cron.ParseStandard(l.Cron)
if err != nil {
return err
}
last := time.Unix(lock.GetCron(l.name), 0)
next := schedule.Next(last)
now := time.Now()
if now.After(next) {
lock.SetCron(l.name, now.Unix())
l.Backup(true)
} else {
if !CRON_LEAN {
colors.Body.Printf("Skipping \"%s\", not due yet.\n", l.name)
}
}
return nil
}