From c9857098ac0a3173d5d03baa3c32d9a8e29faec8 Mon Sep 17 00:00:00 2001
From: William Wilgus <wilgus.william@gmail.com>
Date: Thu, 3 Mar 2022 22:08:28 -0500
Subject: Multiboot Firmware Root Redirect - WIP

Loads external drive into root namespace
Root Redirects can now be put into different folders
For instance placing '/_test' into SD1/rockbox_main.<playername>
will redirect to /<1>/_test/.rockbox
Debug menu>Bootdata now has root directory listed in addition to RAW Bootdata

Redirect root work from Michael Sevakis g#1556, RESTORED -> g#4256

Change-Id: Ia97cf50ff5f5b440877f9c005da6f12c53af931e
---
 apps/debug_menu.c                    |  8 +++++++
 firmware/common/disk.c               | 16 --------------
 firmware/include/dircache_redirect.h | 41 ++++++++++++++++++++++++++++++++++++
 3 files changed, 49 insertions(+), 16 deletions(-)

diff --git a/apps/debug_menu.c b/apps/debug_menu.c
index 3a9218bc84..1b341a96e4 100644
--- a/apps/debug_menu.c
+++ b/apps/debug_menu.c
@@ -128,6 +128,9 @@
 
 #if defined(HAVE_BOOTDATA) && !defined(SIMULATOR)
 #include "bootdata.h"
+#include "rbpaths.h"
+#include "pathfuncs.h"
+#include "rb-loader.h"
 #endif
 
 static const char* threads_getname(int selected_item, void *data,
@@ -2530,12 +2533,17 @@ static bool dbg_boot_data(void)
     simplelist_set_line_count(0);
     crc = crc_32(boot_data.payload, boot_data.length, 0xffffffff);
 #if defined(HAVE_MULTIBOOT)
+    char rootpath[VOL_MAX_LEN+2] = RB_ROOT_CONTENTS_DIR;
     int boot_volume = 0;
     if(crc == boot_data.crc)
     {
         boot_volume = boot_data.boot_volume; /* boot volume contained in uint8_t payload */
+        get_redirect_dir(rootpath, sizeof(rootpath), boot_volume, "", "");
+        rootpath[path_strip_trailing_separators(rootpath,NULL)] = '\0';
     }
     simplelist_addline("Boot Volume: <%lu>", boot_volume);
+    simplelist_addline("Root:");
+    simplelist_addline("%s", rootpath);
     simplelist_addline("");
 #endif
     simplelist_addline("Bootdata RAW:");
diff --git a/firmware/common/disk.c b/firmware/common/disk.c
index c6fbc34409..e94e161d44 100644
--- a/firmware/common/disk.c
+++ b/firmware/common/disk.c
@@ -260,23 +260,7 @@ int disk_mount_all(void)
     for (int i = 0; i < NUM_VOLUMES; i++)
         vol_drive[i] = -1; /* mark all as unassigned */
 
-#if defined(HAVE_BOOTDATA) && !defined(SIMULATOR) && !defined(BOOTLOADER)
-    unsigned int crc = 0;
-    int boot_volume = 0;
-    crc = crc_32(boot_data.payload, boot_data.length, 0xffffffff);
-    if(crc == boot_data.crc)
-    {
-        boot_volume = boot_data.boot_volume; /* boot volume contained in uint8_t payload */
-    }
-    #ifdef HAVE_HOTSWAP
-        if (storage_present(boot_volume))
-    #endif
-            mounted += disk_mount(boot_volume); /* mount boot volume first */
-    for (int i = 0; i < NUM_DRIVES; i++)
-    if (i != boot_volume)
-#else
     for (int i = 0; i < NUM_DRIVES; i++)
-#endif
     {
     #ifdef HAVE_HOTSWAP
         if (storage_present(i))
diff --git a/firmware/include/dircache_redirect.h b/firmware/include/dircache_redirect.h
index 171954a135..dfab6fd5a3 100644
--- a/firmware/include/dircache_redirect.h
+++ b/firmware/include/dircache_redirect.h
@@ -24,6 +24,13 @@
 #include "pathfuncs.h"
 #include "dir.h"
 #include "dircache.h"
+
+#if defined(HAVE_MULTIBOOT) && !defined(SIMULATOR)
+#include "rb-loader.h"
+#include "bootdata.h"
+#include "crc32.h"
+#endif
+
 #ifndef RB_ROOT_VOL_HIDDEN
 #define RB_ROOT_VOL_HIDDEN(v)   (0 == 0)
 #endif
@@ -137,11 +144,45 @@ static inline void volume_onmount_internal(IF_MV_NONVOID(int volume))
 #else
     const char *path = PATH_ROOTSTR;
 #endif
+
+#if defined(HAVE_MULTIBOOT) && !defined(SIMULATOR)
+    static char rtpath[VOL_MAX_LEN+2] = RB_ROOT_CONTENTS_DIR;
+    static bool redirected = false;
+    int boot_volume = 0;
+    unsigned int crc = 0;
+    crc = crc_32(boot_data.payload, boot_data.length, 0xffffffff);
+    if (crc == boot_data.crc)
+    {
+        root_mount_path(path, 0); /*root could be different folder don't hide*/
+        boot_volume = boot_data.boot_volume; /* boot volume contained in uint8_t payload */
+        //root_mount_path(path, volume == boot_volume ? NSITEM_HIDDEN : 0);
+        if (!redirected && volume == boot_volume)
+        {
+            if (get_redirect_dir(rtpath, sizeof(rtpath), volume, "", "") < 0)
+            {   /* Error occurred, card removed? Set root to default */
+                root_mount_path(RB_ROOT_CONTENTS_DIR, NSITEM_CONTENTS);
+            }
+            else
+                redirected = true;
+        }
+        if (redirected && volume == boot_volume)
+            root_mount_path(rtpath, NSITEM_CONTENTS);
+    } /*CRC OK*/
+    else
+    {
+        root_mount_path(path, RB_ROOT_VOL_HIDDEN(volume) ? NSITEM_HIDDEN : 0);
+        if (volume == path_strip_volume(RB_ROOT_CONTENTS_DIR, NULL, false))
+            root_mount_path(RB_ROOT_CONTENTS_DIR, NSITEM_CONTENTS);
+    }
+#else /*ndef HAVE_MULTIBOOT */
+
     root_mount_path(path, RB_ROOT_VOL_HIDDEN(volume) ? NSITEM_HIDDEN : 0);
 #ifdef HAVE_MULTIVOLUME
     if (volume == path_strip_volume(RB_ROOT_CONTENTS_DIR, NULL, false))
 #endif
         root_mount_path(RB_ROOT_CONTENTS_DIR, NSITEM_CONTENTS);
+#endif /* HAVE_MULTIBOOT */
+
 #ifdef HAVE_DIRCACHE
     dircache_mount();
 #endif
-- 
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