Allow lockfile path to be configured

cmd/backup.go

@@ -6,7 +6,6 @@ import (
 
 	"github.com/cupcakearmy/autorestic/internal"
 	"github.com/cupcakearmy/autorestic/internal/colors"
-	"github.com/cupcakearmy/autorestic/internal/lock"
 	"github.com/spf13/cobra"
 )
 
@@ -15,9 +14,9 @@ var backupCmd = &cobra.Command{
 	Short: "Create backups for given locations",
 	Run: func(cmd *cobra.Command, args []string) {
 		internal.GetConfig()
-		err := lock.Lock()
+		err := internal.Lock()
 		CheckErr(err)
-		defer lock.Unlock()
+		defer internal.Unlock()
 
 		selected, err := internal.GetAllOrSelected(cmd, false)
 		CheckErr(err)

cmd/check.go

@@ -3,7 +3,6 @@ package cmd
 import (
 	"github.com/cupcakearmy/autorestic/internal"
 	"github.com/cupcakearmy/autorestic/internal/colors"
-	"github.com/cupcakearmy/autorestic/internal/lock"
 	"github.com/spf13/cobra"
 )
 
@@ -12,9 +11,9 @@ var checkCmd = &cobra.Command{
 	Short: "Check if everything is setup",
 	Run: func(cmd *cobra.Command, args []string) {
 		internal.GetConfig()
-		err := lock.Lock()
+		err := internal.Lock()
 		CheckErr(err)
-		defer lock.Unlock()
+		defer internal.Unlock()
 
 		CheckErr(internal.CheckConfig())
 

cmd/cron.go

@@ -3,7 +3,6 @@ package cmd
 import (
 	"github.com/cupcakearmy/autorestic/internal"
 	"github.com/cupcakearmy/autorestic/internal/flags"
-	"github.com/cupcakearmy/autorestic/internal/lock"
 	"github.com/spf13/cobra"
 )
 
@@ -13,9 +12,9 @@ var cronCmd = &cobra.Command{
 	Long:  `Intended to be mainly triggered by an automated system like systemd or crontab. For each location checks if a cron backup is due and runs it.`,
 	Run: func(cmd *cobra.Command, args []string) {
 		internal.GetConfig()
-		err := lock.Lock()
+		err := internal.Lock()
 		CheckErr(err)
-		defer lock.Unlock()
+		defer internal.Unlock()
 
 		err = internal.RunCron()
 		CheckErr(err)

cmd/exec.go

@@ -5,7 +5,6 @@ import (
 
 	"github.com/cupcakearmy/autorestic/internal"
 	"github.com/cupcakearmy/autorestic/internal/colors"
-	"github.com/cupcakearmy/autorestic/internal/lock"
 	"github.com/spf13/cobra"
 )
 
@@ -14,9 +13,9 @@ var execCmd = &cobra.Command{
 	Short: "Execute arbitrary native restic commands for given backends",
 	Run: func(cmd *cobra.Command, args []string) {
 		internal.GetConfig()
-		err := lock.Lock()
+		err := internal.Lock()
 		CheckErr(err)
-		defer lock.Unlock()
+		defer internal.Unlock()
 
 		selected, err := internal.GetAllOrSelected(cmd, true)
 		CheckErr(err)

cmd/forget.go

@@ -2,7 +2,6 @@ package cmd
 
 import (
 	"github.com/cupcakearmy/autorestic/internal"
-	"github.com/cupcakearmy/autorestic/internal/lock"
 	"github.com/spf13/cobra"
 )
 
@@ -11,9 +10,9 @@ var forgetCmd = &cobra.Command{
 	Short: "Forget and optionally prune snapshots according the specified policies",
 	Run: func(cmd *cobra.Command, args []string) {
 		internal.GetConfig()
-		err := lock.Lock()
+		err := internal.Lock()
 		CheckErr(err)
-		defer lock.Unlock()
+		defer internal.Unlock()
 
 		selected, err := internal.GetAllOrSelected(cmd, false)
 		CheckErr(err)

cmd/restore.go

@@ -4,7 +4,6 @@ import (
 	"fmt"
 
 	"github.com/cupcakearmy/autorestic/internal"
-	"github.com/cupcakearmy/autorestic/internal/lock"
 	"github.com/spf13/cobra"
 )
 
@@ -14,9 +13,9 @@ var restoreCmd = &cobra.Command{
 	Args:  cobra.MaximumNArgs(1),
 	Run: func(cmd *cobra.Command, args []string) {
 		internal.GetConfig()
-		err := lock.Lock()
+		err := internal.Lock()
 		CheckErr(err)
-		defer lock.Unlock()
+		defer internal.Unlock()
 
 		location, _ := cmd.Flags().GetString("location")
 		l, ok := internal.GetLocation(location)

cmd/root.go

@@ -8,7 +8,6 @@ import (
 	"github.com/cupcakearmy/autorestic/internal"
 	"github.com/cupcakearmy/autorestic/internal/colors"
 	"github.com/cupcakearmy/autorestic/internal/flags"
-	"github.com/cupcakearmy/autorestic/internal/lock"
 	"github.com/spf13/cobra"
 
 	homedir "github.com/mitchellh/go-homedir"
@@ -18,7 +17,7 @@ import (
 func CheckErr(err error) {
 	if err != nil {
 		colors.Error.Fprintln(os.Stderr, "Error:", err)
-		lock.Unlock()
+		internal.Unlock()
 		os.Exit(1)
 	}
 }
@@ -42,6 +41,7 @@ func init() {
 	rootCmd.PersistentFlags().BoolVarP(&flags.VERBOSE, "verbose", "v", false, "verbose mode")
 	rootCmd.PersistentFlags().StringVar(&flags.RESTIC_BIN, "restic-bin", "restic", "specify custom restic binary")
 	rootCmd.PersistentFlags().StringVar(&flags.DOCKER_IMAGE, "docker-image", "cupcakearmy/autorestic:"+internal.VERSION, "specify a custom docker image")
+	rootCmd.PersistentFlags().StringVar(&flags.LOCKFILE, "lockfile", "", "specify a custom path for the lockfile (defaults to .autorestic.lock.yml next to the loaded autorestic config file)")
 	cobra.OnInitialize(initConfig)
 }
 

cmd/unlock.go

@@ -9,7 +9,6 @@ import (
 
 	"github.com/cupcakearmy/autorestic/internal"
 	"github.com/cupcakearmy/autorestic/internal/colors"
-	"github.com/cupcakearmy/autorestic/internal/lock"
 	"github.com/spf13/cobra"
 )
 
@@ -33,7 +32,7 @@ To check you can run "ps aux | grep autorestic".`,
 			}
 		}
 
-		err := lock.Unlock()
+		err := internal.Unlock()
 		if err != nil {
 			colors.Error.Println("Could not unlock:", err)
 			return

docs/pages/_meta.json

@@ -3,6 +3,7 @@
   "quick": "Quick Start",
   "installation": "Installation",
   "config": "Configuration",
+  "lockfile": "Lockfile",
   "location": "Locations",
   "backend": "Backend",
   "cli": "CLI",

docs/pages/cli/general.md

@@ -34,3 +34,11 @@ With `--restic-bin` you can specify to run a specific restic binary. This can be
 ```bash
 autorestic --restic-bin /some/path/to/my/custom/restic/binary
 ```
+
+## `--lockfile`
+
+Specify the path for the [lockfile](../lockfile.md) used by `autorestic`. If omitted, this will default to `.autorestic.lock.yml` next to the loaded config file.
+
+```bash
+autorestic --lockfile /path/to/my/.autorestic.lock.yml
+```

docs/pages/lockfile.md

@@ -0,0 +1,14 @@
+# Lockfile
+
+Under the hood, `autorestic` uses a lockfile to ensure that only one instance is running and to keep track of when [cronjobs](./location/cron.md) were last run.
+
+By default, the lockfile is stored next to your [configuration file](./config.md) as `.autorestic.lock.yml`. In other words, if your config file is located at `/some/path/.autorestic.yml`, then the lockfile will be located at `/some/path/.autorestic.lock.yml`.
+
+## Customization
+
+The path to the lockfile can be customized if need be. This can be done is a few ways:
+
+1. Using the `--lockfile ...` command line flag
+1. Setting `lockfile: ...` in the configuration file
+
+Note that `autorestic` will check for a customized lockfile path in the order listed above. This means that if you specify a lockfile path in multiple places, the method that's higher in the list will win.

internal/config.go

@@ -10,7 +10,6 @@ import (
 
 	"github.com/cupcakearmy/autorestic/internal/colors"
 	"github.com/cupcakearmy/autorestic/internal/flags"
-	"github.com/cupcakearmy/autorestic/internal/lock"
 	"github.com/joho/godotenv"
 	"github.com/mitchellh/go-homedir"
 	"github.com/spf13/cobra"
@@ -24,6 +23,7 @@ type Options map[string]OptionMap
 
 type Config struct {
 	Version   string              `mapstructure:"version" yaml:"version"`
+	Lockfile  string              `mapstructure:"lockfile,omitempty" yaml:"lockfile,omitempty"`
 	Extras    interface{}         `mapstructure:"extras" yaml:"extras"`
 	Locations map[string]Location `mapstructure:"locations" yaml:"locations"`
 	Backends  map[string]Backend  `mapstructure:"backends" yaml:"backends"`
@@ -40,7 +40,7 @@ func exitConfig(err error, msg string) {
 	if msg != "" {
 		colors.Error.Println(msg)
 	}
-	lock.Unlock()
+	Unlock()
 	os.Exit(1)
 }
 

internal/flags/flags.go

@@ -1,9 +1,10 @@
 package flags
 
 var (
-	CI         bool = false
-	VERBOSE    bool = false
-	CRON_LEAN  bool = false
-	RESTIC_BIN string
+	CI           bool = false
+	VERBOSE      bool = false
+	CRON_LEAN    bool = false
+	RESTIC_BIN   string
 	DOCKER_IMAGE string
+	LOCKFILE     string
 )

internal/location.go

@@ -11,7 +11,6 @@ import (
 
 	"github.com/cupcakearmy/autorestic/internal/colors"
 	"github.com/cupcakearmy/autorestic/internal/flags"
-	"github.com/cupcakearmy/autorestic/internal/lock"
 	"github.com/cupcakearmy/autorestic/internal/metadata"
 	"github.com/robfig/cron"
 )
@@ -442,11 +441,11 @@ func (l Location) RunCron() error {
 	if err != nil {
 		return err
 	}
-	last := time.Unix(lock.GetCron(l.name), 0)
+	last := time.Unix(GetCron(l.name), 0)
 	next := schedule.Next(last)
 	now := time.Now()
 	if now.After(next) {
-		lock.SetCron(l.name, now.Unix())
+		SetCron(l.name, now.Unix())
 		errs := l.Backup(true, "")
 		if len(errs) > 0 {
 			return fmt.Errorf("Failed to backup location \"%s\":\n%w", l.name, errors.Join(errs...))

internal/lock/lock.go → internal/lock.go

@@ -1,8 +1,9 @@
-package lock
+package internal
 
 import (
 	"os"
 	"path"
+	"path/filepath"
 	"sync"
 
 	"github.com/cupcakearmy/autorestic/internal/colors"
@@ -12,24 +13,47 @@ import (
 
 var lock *viper.Viper
 var file string
-var once sync.Once
+var lockOnce sync.Once
 
 const (
 	RUNNING = "running"
 )
 
+// getLockfilePath returns the path to the lockfile. The path for the lockfile
+// can be sources from multiple places If flags.LOCKFILE is set, its value is
+// used; if the config has the `lockfile` option set, its value is used;
+// otherwise the path is generated relative to the config file.
+func getLockfilePath() string {
+	if flags.LOCKFILE != "" {
+		abs, err := filepath.Abs(flags.LOCKFILE)
+		if err != nil {
+			return flags.LOCKFILE
+		}
+		return abs
+	}
+
+	if lockfile := GetConfig().Lockfile; lockfile != "" {
+		abs, err := filepath.Abs(lockfile)
+		if err != nil {
+			return lockfile
+		}
+		return abs
+	}
+
+	p := viper.ConfigFileUsed()
+	if p == "" {
+		colors.Error.Println("cannot lock before reading config location")
+		os.Exit(1)
+	}
+	return path.Join(path.Dir(p), ".autorestic.lock.yml")
+}
+
 func getLock() *viper.Viper {
 	if lock == nil {
-
-		once.Do(func() {
+		lockOnce.Do(func() {
 			lock = viper.New()
 			lock.SetDefault("running", false)
-			p := viper.ConfigFileUsed()
-			if p == "" {
-				colors.Error.Println("cannot lock before reading config location")
-				os.Exit(1)
-			}
-			file = path.Join(path.Dir(p), ".autorestic.lock.yml")
+			file = getLockfilePath()
 			if !flags.CRON_LEAN {
 				colors.Faint.Println("Using lock:\t", file)
 			}