Support specifying multiple host flags for various commands

The `dump`, `find`, `forget`, `ls`, `mount`, `restore`, `snapshots`,
`stats` and `tag` commands will now take into account multiple
`--host` and `-H` flags.

internal/fuse/root.go

@@ -19,7 +19,7 @@ import (
 // Config holds settings for the fuse mount.
 type Config struct {
 	OwnerIsRoot      bool
-	Host             string
+	Hosts            []string
 	Tags             []restic.TagList
 	Paths            []string
 	SnapshotTemplate string

internal/fuse/snapshots_dir.go

@@ -234,7 +234,7 @@ func updateSnapshots(ctx context.Context, root *Root) error {
 		return nil
 	}
 
-	snapshots, err := restic.FindFilteredSnapshots(ctx, root.repo, root.cfg.Host, root.cfg.Tags, root.cfg.Paths)
+	snapshots, err := restic.FindFilteredSnapshots(ctx, root.repo, root.cfg.Hosts, root.cfg.Tags, root.cfg.Paths)
 	if err != nil {
 		return err
 	}

internal/restic/snapshot.go

@@ -162,8 +162,10 @@ func (sn *Snapshot) HasTags(l []string) bool {
 	return true
 }
 
-// HasTagList returns true if the snapshot satisfies at least one TagList,
-// so there is a TagList in l for which all tags are included in sn.
+// HasTagList returns true if either
+// - the snapshot satisfies at least one TagList, so there is a TagList in l
+//   for which all tags are included in sn, or
+// - l is empty
 func (sn *Snapshot) HasTagList(l []TagList) bool {
 	debug.Log("testing snapshot with tags %v against list: %v", sn.Tags, l)
 
@@ -201,6 +203,23 @@ func (sn *Snapshot) HasPaths(paths []string) bool {
 	return true
 }
 
+// HasHostname returns true if either
+// - the snapshot hostname is in the list of the given hostnames, or
+// - the list of given hostnames is empty
+func (sn *Snapshot) HasHostname(hostnames []string) bool {
+	if len(hostnames) == 0 {
+		return true
+	}
+
+	for _, hostname := range hostnames {
+		if sn.Hostname == hostname {
+			return true
+		}
+	}
+
+	return false
+}
+
 // Snapshots is a list of snapshots.
 type Snapshots []*Snapshot
 

internal/restic/snapshot_find.go

@@ -14,7 +14,7 @@ import (
 var ErrNoSnapshotFound = errors.New("no snapshot found")
 
 // FindLatestSnapshot finds latest snapshot with optional target/directory, tags and hostname filters.
-func FindLatestSnapshot(ctx context.Context, repo Repository, targets []string, tagLists []TagList, hostname string) (ID, error) {
+func FindLatestSnapshot(ctx context.Context, repo Repository, targets []string, tagLists []TagList, hostnames []string) (ID, error) {
 	var err error
 	absTargets := make([]string, 0, len(targets))
 	for _, target := range targets {
@@ -38,7 +38,12 @@ func FindLatestSnapshot(ctx context.Context, repo Repository, targets []string,
 		if err != nil {
 			return errors.Errorf("Error loading snapshot %v: %v", snapshotID.Str(), err)
 		}
-		if snapshot.Time.Before(latest) || (hostname != "" && hostname != snapshot.Hostname) {
+
+		if snapshot.Time.Before(latest) {
+			return nil
+		}
+
+		if !snapshot.HasHostname(hostnames) {
 			return nil
 		}
 
@@ -82,7 +87,7 @@ func FindSnapshot(repo Repository, s string) (ID, error) {
 
 // FindFilteredSnapshots yields Snapshots filtered from the list of all
 // snapshots.
-func FindFilteredSnapshots(ctx context.Context, repo Repository, host string, tags []TagList, paths []string) (Snapshots, error) {
+func FindFilteredSnapshots(ctx context.Context, repo Repository, hosts []string, tags []TagList, paths []string) (Snapshots, error) {
 	results := make(Snapshots, 0, 20)
 
 	err := repo.List(ctx, SnapshotFile, func(id ID, size int64) error {
@@ -92,7 +97,7 @@ func FindFilteredSnapshots(ctx context.Context, repo Repository, host string, ta
 			return nil
 		}
 
-		if (host != "" && host != sn.Hostname) || !sn.HasTagList(tags) || !sn.HasPaths(paths) {
+		if !sn.HasHostname(hosts) || !sn.HasTagList(tags) || !sn.HasPaths(paths) {
 			return nil
 		}