Revert "Erase PST partition if its marked to be erased."

This now gets done at the framework level.
Doing it here breaks the signature on the partition.

This reverts commit ee19387905650cab5da7dd97ada5502cd17ac93d.

Bug: 19967123
Change-Id: I2a977cb0f0ba94defa1bf9091219398ddc1d3528
(cherry picked from commit 037444642bc32d8fed3bb996823b6a62faa57195)

3 files changed, 0 insertions, 44 deletions

diff --git a/recovery.cpp b/recovery.cpp
index a390c8a..4e43e83 100644
--- a/recovery.cpp
+++ b/recovery.cpp
@@ -695,7 +695,6 @@ static void wipe_data(int confirm, Device* device) {
     device->WipeData();
     erase_volume("/data");
     erase_volume("/cache");
-    erase_persistent_partition();
     ui->Print("Data wipe complete.\n");
 }
 
@@ -1102,7 +1101,6 @@ main(int argc, char **argv) {
         if (device->WipeData()) status = INSTALL_ERROR;
         if (erase_volume("/data")) status = INSTALL_ERROR;
         if (should_wipe_cache && erase_volume("/cache")) status = INSTALL_ERROR;
-        if (erase_persistent_partition() == -1 ) status = INSTALL_ERROR;
         if (status != INSTALL_SUCCESS) ui->Print("Data wipe failed.\n");
     } else if (should_wipe_cache) {
         if (should_wipe_cache && erase_volume("/cache")) status = INSTALL_ERROR;
diff --git a/roots.cpp b/roots.cpp
index 0d47577..ee14016 100644
--- a/roots.cpp
+++ b/roots.cpp
@@ -39,8 +39,6 @@ static struct fstab *fstab = NULL;
 
 extern struct selabel_handle *sehandle;
 
-static const char* PERSISTENT_PATH = "/persistent";
-
 void load_volume_table()
 {
     int i;
@@ -266,41 +264,6 @@ int format_volume(const char* volume) {
     return -1;
 }
 
-int erase_persistent_partition() {
-    Volume *v = volume_for_path(PERSISTENT_PATH);
-    if (v == NULL) {
-        // most devices won't have /persistent, so this is not an error.
-        return 0;
-    }
-
-    int fd = open(v->blk_device, O_RDWR);
-    uint64_t size = get_file_size(fd);
-    if (size == 0) {
-        LOGE("failed to stat size of /persistent\n");
-        close(fd);
-        return -1;
-    }
-
-    char oem_unlock_enabled;
-    lseek(fd, size - 1, SEEK_SET);
-    read(fd, &oem_unlock_enabled, 1);
-
-    if (oem_unlock_enabled) {
-        if (wipe_block_device(fd, size)) {
-           LOGE("error wiping /persistent: %s\n", strerror(errno));
-           close(fd);
-           return -1;
-        }
-
-        lseek(fd, size - 1, SEEK_SET);
-        write(fd, &oem_unlock_enabled, 1);
-    }
-
-    close(fd);
-
-    return (int) oem_unlock_enabled;
-}
-
 int setup_install_mounts() {
     if (fstab == NULL) {
         LOGE("can't set up install mounts: no fstab loaded\n");
diff --git a/roots.h b/roots.h
index b62a5b1..230d9de 100644
--- a/roots.h
+++ b/roots.h
@@ -46,11 +46,6 @@ int format_volume(const char* volume);
 // mounted (/tmp and /cache) are mounted.  Returns 0 on success.
 int setup_install_mounts();
 
-// Conditionally wipes the /persistent partition if it's marked
-// to wipe. Returns -1 on failure, 1 if the partition was wiped
-// and 0 if the partition was not wiped.
-int erase_persistent_partition();
-
 #ifdef __cplusplus
 }
 #endif