feat: Run PreValidate hooks for check cmd (#437)

PreValidate can be used to mount remote directories (e.g. via NFS) so
they must executed first before running any restic commands.

This was done for the backup command in 13aa560, but not for check. This
commit fixes that.

cmd/backup.go

@@ -18,9 +18,11 @@ var backupCmd = &cobra.Command{
 		err := lock.Lock()
 		CheckErr(err)
 		defer lock.Unlock()
+		dry, _ := cmd.Flags().GetBool("dry-run")
 
 		selected, err := internal.GetAllOrSelected(cmd, false)
 		CheckErr(err)
+
 		errors := 0
 		for _, name := range selected {
 			var splitted = strings.Split(name, "@")
@@ -29,7 +31,7 @@ var backupCmd = &cobra.Command{
 				specificBackend = splitted[1]
 			}
 			location, _ := internal.GetLocation(splitted[0])
-			errs := location.Backup(false, specificBackend)
+			errs := location.Backup(false, dry, specificBackend)
 			for _, err := range errs {
 				colors.Error.Printf("%s\n\n", err)
 				errors++
@@ -44,4 +46,5 @@ var backupCmd = &cobra.Command{
 func init() {
 	rootCmd.AddCommand(backupCmd)
 	internal.AddFlagsToCommand(backupCmd, false)
+	backupCmd.Flags().Bool("dry-run", false, "do not write changes, show what would be affected")
 }

docs/pages/cli/backup.md

@@ -1,11 +1,14 @@
 # Backup
 
 ```bash
-autorestic backup [-l, --location] [-a, --all]
+autorestic backup [-l, --location] [-a, --all] [--dry-run]
 ```
 
 Performs a backup of all locations if the `-a` flag is passed. To only backup some locations pass one or more `-l` or `--location` flags.
 
+The `--dry-run` flag will do a dry run showing what would have been deleted, but won't touch the actual data.
+
+
 ```bash
 # All
 autorestic backup -a

internal/config.go

@@ -188,15 +188,31 @@ func CheckConfig() error {
 	if !CheckIfResticIsCallable() {
 		return fmt.Errorf(`%s was not found. Install either with "autorestic install" or manually`, flags.RESTIC_BIN)
 	}
-	for name, backend := range c.Backends {
-		backend.name = name
-		if err := backend.validate(); err != nil {
+
+	cwd, _ := GetPathRelativeToConfig(".")
+	for name, location := range c.Locations {
+		location.name = name
+
+		// Hooks before location validation
+		options := ExecuteOptions{
+			Command: "bash",
+			Dir:     cwd,
+			Envs: map[string]string{
+				"AUTORESTIC_LOCATION": location.name,
+			},
+		}
+		if err := location.ExecuteHooks(location.Hooks.PreValidate, options); err != nil {
+			return err
+		}
+
+		if err := location.validate(); err != nil {
 			return err
 		}
 	}
-	for name, location := range c.Locations {
-		location.name = name
-		if err := location.validate(); err != nil {
+
+	for name, backend := range c.Backends {
+		backend.name = name
+		if err := backend.validate(); err != nil {
 			return err
 		}
 	}

internal/location.go

@@ -168,7 +168,7 @@ func (l Location) getLocationTags() string {
 	return buildTag("location", l.name)
 }
 
-func (l Location) Backup(cron bool, specificBackend string) []error {
+func (l Location) Backup(cron bool, dry bool, specificBackend string) []error {
 	var errors []error
 	var backends []string
 	colors.PrimaryPrint("  Backing up location \"%s\"  ", l.name)
@@ -228,6 +228,9 @@ func (l Location) Backup(cron bool, specificBackend string) []error {
 		if cron {
 			cmd = append(cmd, "--tag", buildTag("cron"))
 		}
+		if dry {
+			cmd = append(cmd, "--dry-run")
+		}
 		cmd = append(cmd, "--tag", l.getLocationTags())
 		backupOptions := ExecuteOptions{
 			Envs: env,
@@ -447,7 +450,7 @@ func (l Location) RunCron() error {
 	now := time.Now()
 	if now.After(next) {
 		lock.SetCron(l.name, now.Unix())
-		errs := l.Backup(true, "")
+		errs := l.Backup(true, false, "")
 		if len(errs) > 0 {
 			return fmt.Errorf("Failed to backup location \"%s\":\n%w", l.name, errors.Join(errs...))
 		}