Final shuffle to make /sdcard work in shell.

Move legacy mount location to /storage/emulated/legacy, and create
a symlink to point towards shell-visible FUSE daemon.  This symlink
is then masked from zygote-forked apps by a tmpfs.

Bug: 7255202
Change-Id: I22967c10e5719c0628816f061606924ddd15e5bb
diff --git a/init.tuna.rc b/init.tuna.rc
index 6181640..e2cae6f 100755
--- a/init.tuna.rc
+++ b/init.tuna.rc
@@ -4,18 +4,16 @@
     # See storage config details at http://source.android.com/tech/storage/
     mkdir /mnt/shell/emulated 0700 shell shell
     mkdir /storage/emulated 0000 root root
-    mkdir /storage/emulated_legacy 0000 root root
 
-    export EXTERNAL_STORAGE /storage/emulated_legacy
-    export ADB_EXTERNAL_STORAGE /mnt/shell/emulated/0
-
+    export EXTERNAL_STORAGE /storage/emulated/legacy
     export EMULATED_STORAGE_SOURCE /mnt/shell/emulated
     export EMULATED_STORAGE_TARGET /storage/emulated
 
     # Support legacy paths
-    symlink /storage/emulated_legacy /sdcard
-    symlink /storage/emulated_legacy /mnt/sdcard
-    symlink /storage/emulated_legacy /storage/sdcard0
+    symlink /storage/emulated/legacy /sdcard
+    symlink /storage/emulated/legacy /mnt/sdcard
+    symlink /storage/emulated/legacy /storage/sdcard0
+    symlink /mnt/shell/emulated/0 /storage/emulated/legacy
 
 on post-fs-data
     mkdir /data/media 0770 media_rw media_rw