Add --local-no-unicode-normalization flag

Fixes #1411

docs/content/local.md

@@ -120,6 +120,18 @@ $ rclone -L ls /tmp/a
         6 b/one
 ```
 
+#### --no-local-unicode-normalization ####
+
+By default rclone normalizes (NFC) the unicode representation of filenames and
+directories. This flag disables that normalization and uses the same
+representation as the local filesystem.
+
+This can be useful if you need to retain the local unicode representation and
+you are using a cloud provider which supports unnormalized names (e.g. S3 or ACD).
+
+This should also work with any provider if you are using crypt and have file
+name encryption (the default) or obfuscation turned on.
+
 #### --one-file-system, -x ####
 
 This tells rclone to stay in the filesystem specified by the root and

local/local.go

@@ -23,6 +23,7 @@ import (
 
 var (
 	followSymlinks = fs.BoolP("copy-links", "L", false, "Follow symlinks and copy the pointed to item.")
+	noUTFNorm      = fs.BoolP("local-no-unicode-normalization", "", false, "Don't apply unicode normalization to paths and filenames")
 )
 
 // Constants
@@ -325,7 +326,9 @@ func (f *Fs) cleanRemote(name string) string {
 		f.wmu.Unlock()
 		name = string([]rune(name))
 	}
+	if !*noUTFNorm {
 		name = norm.NFC.String(name)
+	}
 	name = filepath.ToSlash(name)
 	return name
 }