fastboot: Change -w to format after the erase of userdata & cache

If the bootloader doesn't support formatting of those partitions
(either because it doesn't support the getvar commands needed or
the partition type is not supported), the errors are printed but
doesn't halt processing of subsequent commands.

Change-Id: I816ac2e5e7593846fcb4fd39c793a8dbdd996f6f
Signed-off-by: Mike J. Chen <mjchen@google.com>
diff --git a/fastboot/engine.c b/fastboot/engine.c
index 994eeae..46b0828 100644
--- a/fastboot/engine.c
+++ b/fastboot/engine.c
@@ -255,6 +255,7 @@
 #else
     fd = fileno(tmpfile());
 #endif
+    /* reset ext4fs info so we can be called multiple times */
     reset_ext4fs_info();
     info.len = image->partition_size;
     make_ext4fs_internal(fd, NULL, NULL, NULL, 0, 1, 0, 0, 0, NULL);
@@ -266,7 +267,7 @@
     close(fd);
 }
 
-int fb_format(Action *a, usb_handle *usb)
+int fb_format(Action *a, usb_handle *usb, int skip_if_not_supported)
 {
     const char *partition = a->cmd;
     char response[FB_RESPONSE_SZ+1];
@@ -281,6 +282,13 @@
     snprintf(cmd, sizeof(cmd), "getvar:partition-type:%s", partition);
     status = fb_command_response(usb, cmd, response);
     if (status) {
+        if (skip_if_not_supported) {
+            fprintf(stderr,
+                    "Erase successful, but not automatically formatting.\n");
+            fprintf(stderr,
+                    "Can't determine partition type.\n");
+            return 0;
+        }
         fprintf(stderr,"FAILED (%s)\n", fb_get_error());
         return status;
     }
@@ -292,6 +300,13 @@
         }
     }
     if (!generator) {
+        if (skip_if_not_supported) {
+            fprintf(stderr,
+                    "Erase successful, but not automatically formatting.\n");
+            fprintf(stderr,
+                    "File system type %s not supported.\n", response);
+            return 0;
+        }
         fprintf(stderr,"Formatting is not supported for filesystem with type '%s'.\n",
                 response);
         return -1;
@@ -301,6 +316,12 @@
     snprintf(cmd, sizeof(cmd), "getvar:partition-size:%s", partition);
     status = fb_command_response(usb, cmd, response);
     if (status) {
+        if (skip_if_not_supported) {
+            fprintf(stderr,
+                    "Erase successful, but not automatically formatting.\n");
+            fprintf(stderr, "Unable to get partition size\n.");
+            return 0;
+        }
         fprintf(stderr,"FAILED (%s)\n", fb_get_error());
         return status;
     }
@@ -329,11 +350,12 @@
     return status;
 }
 
-void fb_queue_format(const char *partition)
+void fb_queue_format(const char *partition, int skip_if_not_supported)
 {
     Action *a;
 
     a = queue_action(OP_FORMAT, partition);
+    a->data = (void*)skip_if_not_supported;
     a->msg = mkmsg("formatting '%s' partition", partition);
 }
 
@@ -545,7 +567,7 @@
         } else if (a->op == OP_NOTICE) {
             fprintf(stderr,"%s\n",(char*)a->data);
         } else if (a->op == OP_FORMAT) {
-            status = fb_format(a, usb);
+            status = fb_format(a, usb, (int)a->data);
             status = a->func(a, status, status ? fb_get_error() : "");
             if (status) break;
         } else {
diff --git a/fastboot/fastboot.c b/fastboot/fastboot.c
index af61f88..848cea3 100644
--- a/fastboot/fastboot.c
+++ b/fastboot/fastboot.c
@@ -640,7 +640,7 @@
             skip(2);
         } else if(!strcmp(*argv, "format")) {
             require(2);
-            fb_queue_format(argv[1]);
+            fb_queue_format(argv[1], 0);
             skip(2);
         } else if(!strcmp(*argv, "signature")) {
             require(2);
@@ -727,7 +727,9 @@
 
     if (wants_wipe) {
         fb_queue_erase("userdata");
+        fb_queue_format("userdata", 1);
         fb_queue_erase("cache");
+        fb_queue_format("cache", 1);
     }
     if (wants_reboot) {
         fb_queue_reboot();
diff --git a/fastboot/fastboot.h b/fastboot/fastboot.h
index 7d56ecb..1d3e2b8 100644
--- a/fastboot/fastboot.h
+++ b/fastboot/fastboot.h
@@ -43,7 +43,7 @@
 /* engine.c - high level command queue engine */
 void fb_queue_flash(const char *ptn, void *data, unsigned sz);;
 void fb_queue_erase(const char *ptn);
-void fb_queue_format(const char *ptn);
+void fb_queue_format(const char *ptn, int skip_if_not_supported);
 void fb_queue_require(const char *prod, const char *var, int invert,
         unsigned nvalues, const char **value);
 void fb_queue_display(const char *var, const char *prettyname);