build: added freebsd build (untested) with FUSE mounting disabled (#964)

* build: added freebsd build (untested) with mounting disabled until go-fuse has it

* renamed freebsd package names to include 'experimental'

.goreleaser.yml

@@ -8,6 +8,7 @@ builds:
   - CGO_ENABLED=0
   goos:
   - linux
+  - freebsd
   goarch:
     - amd64
     - arm
@@ -24,6 +25,7 @@ archives:
       darwin: macOS
       linux: linux
       windows: windows
+      freebsd: freebsd-experimental
       amd64: x64
     name_template: "{{ .ProjectName }}-{{ .Version }}-{{ .Os }}-{{ .Arch }}"
     wrap_in_directory: true

internal/mount/mount_fuse.go

@@ -1,4 +1,4 @@
-// +build !windows
+// +build !windows,!freebsd
 
 package mount
 

internal/mount/mount_posix_webdav_helper.go

@@ -1,4 +1,4 @@
-// +build !windows
+// +build !windows,!freebsd
 
 package mount
 

internal/mount/mount_unsupported.go

@@ -0,0 +1,16 @@
+// +build freebsd
+
+package mount
+
+import (
+	"context"
+
+	"github.com/pkg/errors"
+
+	"github.com/kopia/kopia/fs"
+)
+
+// Directory returns an error due to mounting being unsupported on current operating system.
+func Directory(ctx context.Context, entry fs.Directory, mountPoint string, mountOptions Options) (Controller, error) {
+	return nil, errors.Errorf("mounting is not supported")
+}

snapshot/restore/local_fs_output_unix.go

@@ -1,3 +1,5 @@
+// +build linux freebsd
+
 package restore
 
 import (