Merge pull request #897 from restic/add-extended-options

Add extended options

src/cmds/restic/cmd_init.go

@@ -27,7 +27,7 @@ func runInit(gopts GlobalOptions, args []string) error {
 		return errors.Fatal("Please specify repository location (-r)")
 	}
 
-	be, err := create(gopts.Repo)
+	be, err := create(gopts.Repo, gopts.extended)
 	if err != nil {
 		return errors.Fatalf("create backend at %s failed: %v\n", gopts.Repo, err)
 	}

src/cmds/restic/global.go

@@ -12,11 +12,12 @@ import (
 	"syscall"
 
 	"restic/backend/local"
+	"restic/backend/location"
 	"restic/backend/rest"
 	"restic/backend/s3"
 	"restic/backend/sftp"
 	"restic/debug"
-	"restic/location"
+	"restic/options"
 	"restic/repository"
 
 	"restic/errors"
@@ -38,6 +39,10 @@ type GlobalOptions struct {
 	password string
 	stdout   io.Writer
 	stderr   io.Writer
+
+	Options []string
+
+	extended options.Options
 }
 
 var globalOptions = GlobalOptions{
@@ -65,6 +70,8 @@ func init() {
 	f.BoolVar(&globalOptions.NoLock, "no-lock", false, "do not lock the repo, this allows some operations on read-only repos")
 	f.BoolVarP(&globalOptions.JSON, "json", "", false, "set output mode to JSON for commands that support it")
 
+	f.StringSliceVarP(&globalOptions.Options, "option", "o", []string{}, "set extended option (`key=value`, can be specified multiple times)")
+
 	restoreTerminal()
 }
 
@@ -287,7 +294,7 @@ func OpenRepository(opts GlobalOptions) (*repository.Repository, error) {
 		return nil, errors.Fatal("Please specify repository location (-r)")
 	}
 
-	be, err := open(opts.Repo)
+	be, err := open(opts.Repo, opts.extended)
 	if err != nil {
 		return nil, err
 	}
@@ -309,8 +316,61 @@ func OpenRepository(opts GlobalOptions) (*repository.Repository, error) {
 	return s, nil
 }
 
+func parseConfig(loc location.Location, opts options.Options) (interface{}, error) {
+	// only apply options for a particular backend here
+	opts = opts.Extract(loc.Scheme)
+
+	switch loc.Scheme {
+	case "local":
+		cfg := loc.Config.(local.Config)
+		if err := opts.Apply(loc.Scheme, &cfg); err != nil {
+			return nil, err
+		}
+
+		debug.Log("opening local repository at %#v", cfg)
+		return cfg, nil
+
+	case "sftp":
+		cfg := loc.Config.(sftp.Config)
+		if err := opts.Apply(loc.Scheme, &cfg); err != nil {
+			return nil, err
+		}
+
+		debug.Log("opening sftp repository at %#v", cfg)
+		return cfg, nil
+
+	case "s3":
+		cfg := loc.Config.(s3.Config)
+		if cfg.KeyID == "" {
+			cfg.KeyID = os.Getenv("AWS_ACCESS_KEY_ID")
+		}
+
+		if cfg.Secret == "" {
+			cfg.Secret = os.Getenv("AWS_SECRET_ACCESS_KEY")
+		}
+
+		if err := opts.Apply(loc.Scheme, &cfg); err != nil {
+			return nil, err
+		}
+
+		debug.Log("opening s3 repository at %#v", cfg)
+		return cfg, nil
+
+	case "rest":
+		cfg := loc.Config.(rest.Config)
+		if err := opts.Apply(loc.Scheme, &cfg); err != nil {
+			return nil, err
+		}
+
+		debug.Log("opening rest repository at %#v", cfg)
+		return cfg, nil
+	}
+
+	return nil, errors.Fatalf("invalid backend: %q", loc.Scheme)
+}
+
 // Open the backend specified by a location config.
-func open(s string) (restic.Backend, error) {
+func open(s string, opts options.Options) (restic.Backend, error) {
 	debug.Log("parsing location %v", s)
 	loc, err := location.Parse(s)
 	if err != nil {
@@ -319,27 +379,21 @@ func open(s string) (restic.Backend, error) {
 
 	var be restic.Backend
 
+	cfg, err := parseConfig(loc, opts)
+	if err != nil {
+		return nil, err
+	}
+
 	switch loc.Scheme {
 	case "local":
-		debug.Log("opening local repository at %#v", loc.Config)
-		be, err = local.Open(loc.Config.(string))
+		be, err = local.Open(cfg.(local.Config))
 	case "sftp":
-		debug.Log("opening sftp repository at %#v", loc.Config)
-		be, err = sftp.OpenWithConfig(loc.Config.(sftp.Config))
+		be, err = sftp.OpenWithConfig(cfg.(sftp.Config))
 	case "s3":
-		cfg := loc.Config.(s3.Config)
-		if cfg.KeyID == "" {
-			cfg.KeyID = os.Getenv("AWS_ACCESS_KEY_ID")
-
-		}
-		if cfg.Secret == "" {
-			cfg.Secret = os.Getenv("AWS_SECRET_ACCESS_KEY")
-		}
-
-		debug.Log("opening s3 repository at %#v", cfg)
-		be, err = s3.Open(cfg)
+		be, err = s3.Open(cfg.(s3.Config))
 	case "rest":
-		be, err = rest.Open(loc.Config.(rest.Config))
+		be, err = rest.Open(cfg.(rest.Config))
+
 	default:
 		return nil, errors.Fatalf("invalid backend: %q", loc.Scheme)
 	}
@@ -352,34 +406,27 @@ func open(s string) (restic.Backend, error) {
 }
 
 // Create the backend specified by URI.
-func create(s string) (restic.Backend, error) {
+func create(s string, opts options.Options) (restic.Backend, error) {
 	debug.Log("parsing location %v", s)
 	loc, err := location.Parse(s)
 	if err != nil {
 		return nil, err
 	}
 
+	cfg, err := parseConfig(loc, opts)
+	if err != nil {
+		return nil, err
+	}
+
 	switch loc.Scheme {
 	case "local":
-		debug.Log("create local repository at %#v", loc.Config)
-		return local.Create(loc.Config.(string))
+		return local.Create(cfg.(local.Config))
 	case "sftp":
-		debug.Log("create sftp repository at %#v", loc.Config)
-		return sftp.CreateWithConfig(loc.Config.(sftp.Config))
+		return sftp.CreateWithConfig(cfg.(sftp.Config))
 	case "s3":
-		cfg := loc.Config.(s3.Config)
-		if cfg.KeyID == "" {
-			cfg.KeyID = os.Getenv("AWS_ACCESS_KEY_ID")
-
-		}
-		if cfg.Secret == "" {
-			cfg.Secret = os.Getenv("AWS_SECRET_ACCESS_KEY")
-		}
-
-		debug.Log("create s3 repository at %#v", loc.Config)
-		return s3.Open(cfg)
+		return s3.Open(cfg.(s3.Config))
 	case "rest":
-		return rest.Create(loc.Config.(rest.Config))
+		return rest.Create(cfg.(rest.Config))
 	}
 
 	debug.Log("invalid repository scheme: %v", s)

src/cmds/restic/main.go

@@ -5,6 +5,7 @@ import (
 	"os"
 	"restic"
 	"restic/debug"
+	"restic/options"
 
 	"github.com/spf13/cobra"
 
@@ -22,10 +23,21 @@ directories in an encrypted repository stored on different backends.
 	SilenceErrors: true,
 	SilenceUsage:  true,
 
+	PersistentPreRunE: func(*cobra.Command, []string) error {
+		// parse extended options
+		opts, err := options.Parse(globalOptions.Options)
+		if err != nil {
+			return err
+		}
+		globalOptions.extended = opts
+
 		// run the debug functions for all subcommands (if build tag "debug" is
 		// enabled)
-	PersistentPreRunE: func(*cobra.Command, []string) error {
-		return runDebug()
+		if err := runDebug(); err != nil {
+			return err
+		}
+
+		return nil
 	},
 	PersistentPostRun: func(*cobra.Command, []string) {
 		shutdownDebug()

src/restic/backend/local/config.go

@@ -6,11 +6,16 @@ import (
 	"restic/errors"
 )
 
+// Config holds all information needed to open a local repository.
+type Config struct {
+	Path string
+}
+
 // ParseConfig parses a local backend config.
 func ParseConfig(cfg string) (interface{}, error) {
 	if !strings.HasPrefix(cfg, "local:") {
 		return nil, errors.New(`invalid format, prefix "local" not found`)
 	}
 
-	return cfg[6:], nil
+	return Config{Path: cfg[6:]}, nil
 }

src/restic/backend/local/local.go

@@ -16,7 +16,7 @@ import (
 
 // Local is a backend in a local directory.
 type Local struct {
-	p string
+	Config
 }
 
 var _ restic.Backend = &Local{}
@@ -34,28 +34,28 @@ func paths(dir string) []string {
 }
 
 // Open opens the local backend as specified by config.
-func Open(dir string) (*Local, error) {
+func Open(cfg Config) (*Local, error) {
 	// test if all necessary dirs are there
-	for _, d := range paths(dir) {
+	for _, d := range paths(cfg.Path) {
 		if _, err := fs.Stat(d); err != nil {
 			return nil, errors.Wrap(err, "Open")
 		}
 	}
 
-	return &Local{p: dir}, nil
+	return &Local{Config: cfg}, nil
 }
 
 // Create creates all the necessary files and directories for a new local
 // backend at dir. Afterwards a new config blob should be created.
-func Create(dir string) (*Local, error) {
+func Create(cfg Config) (*Local, error) {
 	// test if config file already exists
-	_, err := fs.Lstat(filepath.Join(dir, backend.Paths.Config))
+	_, err := fs.Lstat(filepath.Join(cfg.Path, backend.Paths.Config))
 	if err == nil {
 		return nil, errors.New("config file already exists")
 	}
 
 	// create paths for data, refs and temp
-	for _, d := range paths(dir) {
+	for _, d := range paths(cfg.Path) {
 		err := fs.MkdirAll(d, backend.Modes.Dir)
 		if err != nil {
 			return nil, errors.Wrap(err, "MkdirAll")
@@ -63,12 +63,12 @@ func Create(dir string) (*Local, error) {
 	}
 
 	// open backend
-	return Open(dir)
+	return Open(cfg)
 }
 
 // Location returns this backend's location (the directory name).
 func (b *Local) Location() string {
-	return b.p
+	return b.Path
 }
 
 // Construct path for given Type and name.
@@ -132,13 +132,13 @@ func (b *Local) Save(h restic.Handle, rd io.Reader) (err error) {
 		return err
 	}
 
-	tmpfile, err := copyToTempfile(filepath.Join(b.p, backend.Paths.Temp), rd)
+	tmpfile, err := copyToTempfile(filepath.Join(b.Path, backend.Paths.Temp), rd)
 	debug.Log("saved %v to %v", h, tmpfile)
 	if err != nil {
 		return err
 	}
 
-	filename := filename(b.p, h.Type, h.Name)
+	filename := filename(b.Path, h.Type, h.Name)
 
 	// test if new path already exists
 	if _, err := fs.Stat(filename); err == nil {
@@ -183,7 +183,7 @@ func (b *Local) Load(h restic.Handle, length int, offset int64) (io.ReadCloser,
 		return nil, errors.New("offset is negative")
 	}
 
-	f, err := os.Open(filename(b.p, h.Type, h.Name))
+	f, err := os.Open(filename(b.Path, h.Type, h.Name))
 	if err != nil {
 		return nil, err
 	}
@@ -210,7 +210,7 @@ func (b *Local) Stat(h restic.Handle) (restic.FileInfo, error) {
 		return restic.FileInfo{}, err
 	}
 
-	fi, err := fs.Stat(filename(b.p, h.Type, h.Name))
+	fi, err := fs.Stat(filename(b.Path, h.Type, h.Name))
 	if err != nil {
 		return restic.FileInfo{}, errors.Wrap(err, "Stat")
 	}
@@ -221,7 +221,7 @@ func (b *Local) Stat(h restic.Handle) (restic.FileInfo, error) {
 // Test returns true if a blob of the given type and name exists in the backend.
 func (b *Local) Test(h restic.Handle) (bool, error) {
 	debug.Log("Test %v", h)
-	_, err := fs.Stat(filename(b.p, h.Type, h.Name))
+	_, err := fs.Stat(filename(b.Path, h.Type, h.Name))
 	if err != nil {
 		if os.IsNotExist(errors.Cause(err)) {
 			return false, nil
@@ -235,7 +235,7 @@ func (b *Local) Test(h restic.Handle) (bool, error) {
 // Remove removes the blob with the given name and type.
 func (b *Local) Remove(h restic.Handle) error {
 	debug.Log("Remove %v", h)
-	fn := filename(b.p, h.Type, h.Name)
+	fn := filename(b.Path, h.Type, h.Name)
 
 	// reset read-only flag
 	err := fs.Chmod(fn, 0666)
@@ -316,7 +316,7 @@ func (b *Local) List(t restic.FileType, done <-chan struct{}) <-chan string {
 	}
 
 	ch := make(chan string)
-	items, err := lister(filepath.Join(dirname(b.p, t, "")))
+	items, err := lister(filepath.Join(dirname(b.Path, t, "")))
 	if err != nil {
 		close(ch)
 		return ch
@@ -343,7 +343,7 @@ func (b *Local) List(t restic.FileType, done <-chan struct{}) <-chan string {
 // Delete removes the repository and all files.
 func (b *Local) Delete() error {
 	debug.Log("Delete()")
-	return fs.RemoveAll(b.p)
+	return fs.RemoveAll(b.Path)
 }
 
 // Close closes all open files.

src/restic/backend/local/local_test.go

@@ -35,7 +35,7 @@ func init() {
 		if err != nil {
 			return nil, err
 		}
-		return local.Create(tempBackendDir)
+		return local.Create(local.Config{Path: tempBackendDir})
 	}
 
 	test.OpenFn = func() (restic.Backend, error) {
@@ -43,7 +43,7 @@ func init() {
 		if err != nil {
 			return nil, err
 		}
-		return local.Open(tempBackendDir)
+		return local.Open(local.Config{Path: tempBackendDir})
 	}
 
 	test.CleanupFn = func() error {

src/restic/backend/location/location_test.go

@@ -0,0 +1,227 @@
+package location
+
+import (
+	"net/url"
+	"reflect"
+	"testing"
+
+	"restic/backend/local"
+	"restic/backend/rest"
+	"restic/backend/s3"
+	"restic/backend/sftp"
+)
+
+func parseURL(s string) *url.URL {
+	u, err := url.Parse(s)
+	if err != nil {
+		panic(err)
+	}
+
+	return u
+}
+
+var parseTests = []struct {
+	s string
+	u Location
+}{
+	{
+		"local:/srv/repo",
+		Location{Scheme: "local",
+			Config: local.Config{
+				Path: "/srv/repo",
+			},
+		},
+	},
+	{
+		"local:dir1/dir2",
+		Location{Scheme: "local",
+			Config: local.Config{
+				Path: "dir1/dir2",
+			},
+		},
+	},
+	{
+		"local:dir1/dir2",
+		Location{Scheme: "local",
+			Config: local.Config{
+				Path: "dir1/dir2",
+			},
+		},
+	},
+	{
+		"dir1/dir2",
+		Location{Scheme: "local",
+			Config: local.Config{
+				Path: "dir1/dir2",
+			},
+		},
+	},
+	{
+		"local:../dir1/dir2",
+		Location{Scheme: "local",
+			Config: local.Config{
+				Path: "../dir1/dir2",
+			},
+		},
+	},
+	{
+		"/dir1/dir2",
+		Location{Scheme: "local",
+			Config: local.Config{
+				Path: "/dir1/dir2",
+			},
+		},
+	},
+
+	{
+		"sftp:user@host:/srv/repo",
+		Location{Scheme: "sftp",
+			Config: sftp.Config{
+				User: "user",
+				Host: "host",
+				Dir:  "/srv/repo",
+			},
+		},
+	},
+	{
+		"sftp:host:/srv/repo",
+		Location{Scheme: "sftp",
+			Config: sftp.Config{
+				User: "",
+				Host: "host",
+				Dir:  "/srv/repo",
+			},
+		},
+	},
+	{
+		"sftp://user@host/srv/repo",
+		Location{Scheme: "sftp",
+			Config: sftp.Config{
+				User: "user",
+				Host: "host",
+				Dir:  "srv/repo",
+			},
+		},
+	},
+	{
+		"sftp://user@host//srv/repo",
+		Location{Scheme: "sftp",
+			Config: sftp.Config{
+				User: "user",
+				Host: "host",
+				Dir:  "/srv/repo",
+			},
+		},
+	},
+
+	{
+		"s3://eu-central-1/bucketname",
+		Location{Scheme: "s3",
+			Config: s3.Config{
+				Endpoint: "eu-central-1",
+				Bucket:   "bucketname",
+				Prefix:   "restic",
+			},
+		},
+	},
+	{
+		"s3://hostname.foo/bucketname",
+		Location{Scheme: "s3",
+			Config: s3.Config{
+				Endpoint: "hostname.foo",
+				Bucket:   "bucketname",
+				Prefix:   "restic",
+			},
+		},
+	},
+	{
+		"s3://hostname.foo/bucketname/prefix/directory",
+		Location{Scheme: "s3",
+			Config: s3.Config{
+				Endpoint: "hostname.foo",
+				Bucket:   "bucketname",
+				Prefix:   "prefix/directory",
+			},
+		},
+	},
+	{
+		"s3:eu-central-1/repo",
+		Location{Scheme: "s3",
+			Config: s3.Config{
+				Endpoint: "eu-central-1",
+				Bucket:   "repo",
+				Prefix:   "restic",
+			},
+		},
+	},
+	{
+		"s3:eu-central-1/repo/prefix/directory",
+		Location{Scheme: "s3",
+			Config: s3.Config{
+				Endpoint: "eu-central-1",
+				Bucket:   "repo",
+				Prefix:   "prefix/directory",
+			},
+		},
+	},
+	{
+		"s3:https://hostname.foo/repo",
+		Location{Scheme: "s3",
+			Config: s3.Config{
+				Endpoint: "hostname.foo",
+				Bucket:   "repo",
+				Prefix:   "restic",
+			},
+		},
+	},
+	{
+		"s3:https://hostname.foo/repo/prefix/directory",
+		Location{Scheme: "s3",
+			Config: s3.Config{
+				Endpoint: "hostname.foo",
+				Bucket:   "repo",
+				Prefix:   "prefix/directory",
+			},
+		},
+	},
+	{
+		"s3:http://hostname.foo/repo",
+		Location{Scheme: "s3",
+			Config: s3.Config{
+				Endpoint: "hostname.foo",
+				Bucket:   "repo",
+				Prefix:   "restic",
+				UseHTTP:  true,
+			},
+		},
+	},
+	{
+		"rest:http://hostname.foo:1234/",
+		Location{Scheme: "rest",
+			Config: rest.Config{
+				URL: parseURL("http://hostname.foo:1234/"),
+			},
+		},
+	},
+}
+
+func TestParse(t *testing.T) {
+	for i, test := range parseTests {
+		t.Run(test.s, func(t *testing.T) {
+			u, err := Parse(test.s)
+			if err != nil {
+				t.Fatalf("unexpected error: %v", err)
+			}
+
+			if test.u.Scheme != u.Scheme {
+				t.Errorf("test %d: scheme does not match, want %q, got %q",
+					i, test.u.Scheme, u.Scheme)
+			}
+
+			if !reflect.DeepEqual(test.u.Config, u.Config) {
+				t.Errorf("test %d: cfg map does not match, want:\n  %#v\ngot: \n  %#v",
+					i, test.u.Config, u.Config)
+			}
+		})
+	}
+}

src/restic/location/location_test.go

@@ -1,140 +0,0 @@
-package location
-
-import (
-	"net/url"
-	"reflect"
-	"testing"
-
-	"restic/backend/rest"
-	"restic/backend/s3"
-	"restic/backend/sftp"
-)
-
-func parseURL(s string) *url.URL {
-	u, err := url.Parse(s)
-	if err != nil {
-		panic(err)
-	}
-
-	return u
-}
-
-var parseTests = []struct {
-	s string
-	u Location
-}{
-	{"local:/srv/repo", Location{Scheme: "local", Config: "/srv/repo"}},
-	{"local:dir1/dir2", Location{Scheme: "local", Config: "dir1/dir2"}},
-	{"local:dir1/dir2", Location{Scheme: "local", Config: "dir1/dir2"}},
-	{"dir1/dir2", Location{Scheme: "local", Config: "dir1/dir2"}},
-	{"local:../dir1/dir2", Location{Scheme: "local", Config: "../dir1/dir2"}},
-	{"/dir1/dir2", Location{Scheme: "local", Config: "/dir1/dir2"}},
-
-	{"sftp:user@host:/srv/repo", Location{Scheme: "sftp",
-		Config: sftp.Config{
-			User: "user",
-			Host: "host",
-			Dir:  "/srv/repo",
-		}}},
-	{"sftp:host:/srv/repo", Location{Scheme: "sftp",
-		Config: sftp.Config{
-			User: "",
-			Host: "host",
-			Dir:  "/srv/repo",
-		}}},
-	{"sftp://user@host/srv/repo", Location{Scheme: "sftp",
-		Config: sftp.Config{
-			User: "user",
-			Host: "host",
-			Dir:  "srv/repo",
-		}}},
-	{"sftp://user@host//srv/repo", Location{Scheme: "sftp",
-		Config: sftp.Config{
-			User: "user",
-			Host: "host",
-			Dir:  "/srv/repo",
-		}}},
-
-	{"s3://eu-central-1/bucketname", Location{Scheme: "s3",
-		Config: s3.Config{
-			Endpoint: "eu-central-1",
-			Bucket:   "bucketname",
-			Prefix:   "restic",
-		}},
-	},
-	{"s3://hostname.foo/bucketname", Location{Scheme: "s3",
-		Config: s3.Config{
-			Endpoint: "hostname.foo",
-			Bucket:   "bucketname",
-			Prefix:   "restic",
-		}},
-	},
-	{"s3://hostname.foo/bucketname/prefix/directory", Location{Scheme: "s3",
-		Config: s3.Config{
-			Endpoint: "hostname.foo",
-			Bucket:   "bucketname",
-			Prefix:   "prefix/directory",
-		}},
-	},
-	{"s3:eu-central-1/repo", Location{Scheme: "s3",
-		Config: s3.Config{
-			Endpoint: "eu-central-1",
-			Bucket:   "repo",
-			Prefix:   "restic",
-		}},
-	},
-	{"s3:eu-central-1/repo/prefix/directory", Location{Scheme: "s3",
-		Config: s3.Config{
-			Endpoint: "eu-central-1",
-			Bucket:   "repo",
-			Prefix:   "prefix/directory",
-		}},
-	},
-	{"s3:https://hostname.foo/repo", Location{Scheme: "s3",
-		Config: s3.Config{
-			Endpoint: "hostname.foo",
-			Bucket:   "repo",
-			Prefix:   "restic",
-		}},
-	},
-	{"s3:https://hostname.foo/repo/prefix/directory", Location{Scheme: "s3",
-		Config: s3.Config{
-			Endpoint: "hostname.foo",
-			Bucket:   "repo",
-			Prefix:   "prefix/directory",
-		}},
-	},
-	{"s3:http://hostname.foo/repo", Location{Scheme: "s3",
-		Config: s3.Config{
-			Endpoint: "hostname.foo",
-			Bucket:   "repo",
-			Prefix:   "restic",
-			UseHTTP:  true,
-		}},
-	},
-	{"rest:http://hostname.foo:1234/", Location{Scheme: "rest",
-		Config: rest.Config{
-			URL: parseURL("http://hostname.foo:1234/"),
-		}},
-	},
-}
-
-func TestParse(t *testing.T) {
-	for i, test := range parseTests {
-		u, err := Parse(test.s)
-		if err != nil {
-			t.Errorf("unexpected error: %v", err)
-			continue
-		}
-
-		if test.u.Scheme != u.Scheme {
-			t.Errorf("test %d: scheme does not match, want %q, got %q",
-				i, test.u.Scheme, u.Scheme)
-		}
-
-		if !reflect.DeepEqual(test.u.Config, u.Config) {
-			t.Errorf("test %d: cfg map does not match, want:\n  %#v\ngot: \n  %#v",
-				i, test.u.Config, u.Config)
-		}
-	}
-}

src/restic/options/options.go

@@ -0,0 +1,129 @@
+package options
+
+import (
+	"reflect"
+	"restic/errors"
+	"strconv"
+	"strings"
+	"time"
+)
+
+// Options holds options in the form key=value.
+type Options map[string]string
+
+// splitKeyValue splits at the first equals (=) sign.
+func splitKeyValue(s string) (key string, value string) {
+	data := strings.SplitN(s, "=", 2)
+	key = strings.ToLower(strings.TrimSpace(data[0]))
+	if len(data) == 1 {
+		// no equals sign is treated as the empty value
+		return key, ""
+	}
+
+	return key, strings.TrimSpace(data[1])
+}
+
+// Parse takes a slice of key=value pairs and returns an Options type.
+// The key may include namespaces, separated by dots. Example: "foo.bar=value".
+// Keys are converted to lower-case.
+func Parse(in []string) (Options, error) {
+	opts := make(Options, len(in))
+
+	for _, opt := range in {
+		key, value := splitKeyValue(opt)
+
+		if key == "" {
+			return Options{}, errors.Fatalf("empty key is not a valid option")
+		}
+
+		if v, ok := opts[key]; ok && v != value {
+			return Options{}, errors.Fatalf("key %q present more than once", key)
+		}
+
+		opts[key] = value
+	}
+
+	return opts, nil
+}
+
+// Extract returns an Options type with all keys in namespace ns, which is
+// also stripped from the keys. ns must end with a dot.
+func (o Options) Extract(ns string) Options {
+	l := len(ns)
+	if ns[l-1] != '.' {
+		ns += "."
+		l++
+	}
+
+	opts := make(Options)
+
+	for k, v := range o {
+		if !strings.HasPrefix(k, ns) {
+			continue
+		}
+
+		opts[k[l:]] = v
+	}
+
+	return opts
+}
+
+// Apply sets the options on dst via reflection, using the struct tag `option`.
+// The namespace argument (ns) is only used for error messages.
+func (o Options) Apply(ns string, dst interface{}) error {
+	v := reflect.ValueOf(dst).Elem()
+
+	fields := make(map[string]reflect.StructField)
+
+	for i := 0; i < v.NumField(); i++ {
+		f := v.Type().Field(i)
+		tag := f.Tag.Get("option")
+
+		if tag == "" {
+			continue
+		}
+
+		if _, ok := fields[tag]; ok {
+			panic("option tag " + tag + " is not unique in " + v.Type().Name())
+		}
+
+		fields[tag] = f
+	}
+
+	for key, value := range o {
+		field, ok := fields[key]
+		if !ok {
+			if ns != "" {
+				key = ns + "." + key
+			}
+			return errors.Fatalf("option %v is not known", key)
+		}
+
+		i := field.Index[0]
+		switch v.Type().Field(i).Type.Name() {
+		case "string":
+			v.Field(i).SetString(value)
+
+		case "int":
+			vi, err := strconv.ParseInt(value, 0, 32)
+			if err != nil {
+				return err
+			}
+
+			v.Field(i).SetInt(vi)
+
+		case "Duration":
+			d, err := time.ParseDuration(value)
+			if err != nil {
+				return err
+			}
+
+			v.Field(i).SetInt(int64(d))
+
+		default:
+			panic("type " + v.Type().Field(i).Type.Name() + " not handled")
+		}
+	}
+
+	return nil
+}

src/restic/options/options_test.go

@@ -0,0 +1,220 @@
+package options
+
+import (
+	"fmt"
+	"reflect"
+	"testing"
+	"time"
+)
+
+var optsTests = []struct {
+	input  []string
+	output Options
+}{
+	{
+		[]string{"foo=bar", "bar=baz ", "k="},
+		Options{
+			"foo": "bar",
+			"bar": "baz",
+			"k":   "",
+		},
+	},
+	{
+		[]string{"Foo=23", "baR", "k=thing with spaces"},
+		Options{
+			"foo": "23",
+			"bar": "",
+			"k":   "thing with spaces",
+		},
+	},
+	{
+		[]string{"k=thing with spaces", "k2=more spaces = not evil"},
+		Options{
+			"k":  "thing with spaces",
+			"k2": "more spaces = not evil",
+		},
+	},
+	{
+		[]string{"x=1", "foo=bar", "y=2", "foo=bar"},
+		Options{
+			"x":   "1",
+			"y":   "2",
+			"foo": "bar",
+		},
+	},
+}
+
+func TestParseOptions(t *testing.T) {
+	for i, test := range optsTests {
+		t.Run(fmt.Sprintf("test-%v", i), func(t *testing.T) {
+			opts, err := Parse(test.input)
+			if err != nil {
+				t.Fatalf("unable to parse options: %v", err)
+			}
+
+			if !reflect.DeepEqual(opts, test.output) {
+				t.Fatalf("wrong result, want:\n  %#v\ngot:\n  %#v", test.output, opts)
+			}
+		})
+	}
+}
+
+var invalidOptsTests = []struct {
+	input []string
+	err   string
+}{
+	{
+		[]string{"=bar", "bar=baz", "k="},
+		"empty key is not a valid option",
+	},
+	{
+		[]string{"x=1", "foo=bar", "y=2", "foo=baz"},
+		`key "foo" present more than once`,
+	},
+}
+
+func TestParseInvalidOptions(t *testing.T) {
+	for _, test := range invalidOptsTests {
+		t.Run(test.err, func(t *testing.T) {
+			_, err := Parse(test.input)
+			if err == nil {
+				t.Fatalf("expected error (%v) not found, err is nil", test.err)
+			}
+
+			if err.Error() != test.err {
+				t.Fatalf("expected error %q, got %q", test.err, err.Error())
+			}
+		})
+	}
+}
+
+var extractTests = []struct {
+	input  Options
+	ns     string
+	output Options
+}{
+	{
+		input: Options{
+			"foo.bar:":     "baz",
+			"s3.timeout":   "10s",
+			"sftp.timeout": "5s",
+			"global":       "foobar",
+		},
+		ns: "s3",
+		output: Options{
+			"timeout": "10s",
+		},
+	},
+}
+
+func TestOptionsExtract(t *testing.T) {
+	for _, test := range extractTests {
+		t.Run(test.ns, func(t *testing.T) {
+			opts := test.input.Extract(test.ns)
+
+			if !reflect.DeepEqual(opts, test.output) {
+				t.Fatalf("wrong result, want:\n  %#v\ngot:\n  %#v", test.output, opts)
+			}
+		})
+	}
+}
+
+// Target is used for Apply() tests
+type Target struct {
+	Name    string        `option:"name"`
+	ID      int           `option:"id"`
+	Timeout time.Duration `option:"timeout"`
+	Other   string
+}
+
+var setTests = []struct {
+	input  Options
+	output Target
+}{
+	{
+		Options{
+			"name": "foobar",
+		},
+		Target{
+			Name: "foobar",
+		},
+	},
+	{
+		Options{
+			"name": "foobar",
+			"id":   "1234",
+		},
+		Target{
+			Name: "foobar",
+			ID:   1234,
+		},
+	},
+	{
+		Options{
+			"timeout": "10m3s",
+		},
+		Target{
+			Timeout: time.Duration(10*time.Minute + 3*time.Second),
+		},
+	},
+}
+
+func TestOptionsApply(t *testing.T) {
+	for i, test := range setTests {
+		t.Run(fmt.Sprintf("test-%d", i), func(t *testing.T) {
+			var dst Target
+			err := test.input.Apply("", &dst)
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			if dst != test.output {
+				t.Fatalf("wrong result, want:\n  %#v\ngot:\n  %#v", test.output, dst)
+			}
+		})
+	}
+}
+
+var invalidSetTests = []struct {
+	input     Options
+	namespace string
+	err       string
+}{
+	{
+		Options{
+			"first_name": "foobar",
+		},
+		"ns",
+		"option ns.first_name is not known",
+	},
+	{
+		Options{
+			"id": "foobar",
+		},
+		"ns",
+		`strconv.ParseInt: parsing "foobar": invalid syntax`,
+	},
+	{
+		Options{
+			"timeout": "2134",
+		},
+		"ns",
+		`time: missing unit in duration 2134`,
+	},
+}
+
+func TestOptionsApplyInvalid(t *testing.T) {
+	for i, test := range invalidSetTests {
+		t.Run(fmt.Sprintf("test-%d", i), func(t *testing.T) {
+			var dst Target
+			err := test.input.Apply(test.namespace, &dst)
+			if err == nil {
+				t.Fatalf("expected error %v not found", test.err)
+			}
+
+			if err.Error() != test.err {
+				t.Fatalf("expected error %q, got %q", test.err, err.Error())
+			}
+		})
+	}
+}

src/restic/repository/testing.go

@@ -67,7 +67,7 @@ func TestRepository(t testing.TB) (r restic.Repository, cleanup func()) {
 	if dir != "" {
 		_, err := os.Stat(dir)
 		if err != nil {
-			be, err := local.Create(dir)
+			be, err := local.Create(local.Config{Path: dir})
 			if err != nil {
 				t.Fatalf("error creating local backend at %v: %v", dir, err)
 			}
@@ -84,7 +84,7 @@ func TestRepository(t testing.TB) (r restic.Repository, cleanup func()) {
 
 // TestOpenLocal opens a local repository.
 func TestOpenLocal(t testing.TB, dir string) (r restic.Repository) {
-	be, err := local.Open(dir)
+	be, err := local.Open(local.Config{Path: dir})
 	if err != nil {
 		t.Fatal(err)
 	}