main: sanitize commas from fsname

The cipherdir path is used as the fsname, as displayed
in "df -T". Now, having a comma in fsname triggers a sanity check
in go-fuse, aborting the mount with:

  /bin/fusermount: mount failed: Invalid argument
  fuse.NewServer failed: fusermount exited with code 256

Sanitize fsname by replacing any commas with underscores.

https://github.com/rfjakob/gocryptfs/issues/262

1 files changed, 5 insertions, 0 deletions

diff --git a/mount.go b/mount.go
index d050c60..f473e1e 100644
--- a/mount.go
+++ b/mount.go
@@ -309,6 +309,11 @@ func initGoFuse(fs pathfs.FileSystem, args *argContainer) *fuse.Server {
 	if args.fsname != "" {
 		fsname = args.fsname
 	}
+	fsname2 := strings.Replace(fsname, ",", "_", -1)
+	if fsname2 != fsname {
+		tlog.Warn.Printf("Warning: %q will be displayed as %q in \"df -T\"", fsname, fsname2)
+		fsname = fsname2
+	}
 	mOpts.Options = append(mOpts.Options, "fsname="+fsname)
 	// Second column, "Type", will be shown as "fuse." + Name
 	mOpts.Name = "gocryptfs"