adb: Don't clobber block devices during push

In the past, an adb push would ALWAYS unlink the target path.
Now, we only links and regular files (and links).
This allows the following to work:

   adb shell ls -l /dev/block/mmcblk0p8
     # brw------- root     root     179,   8 2013-11-28 07:43 mmcblk0p8
   adb push n7.jpa.mda.post_jb_encryption.raw  /dev/block/mmcblk0p8

Bug: 11984121
Change-Id: I982c7a1cd87986621f2bebdcb41c4e281f67f772

1 files changed, 6 insertions, 3 deletions

diff --git a/adb/file_sync_service.c b/adb/file_sync_service.c
index e981c2a..25bfdc9 100644
--- a/adb/file_sync_service.c
+++ b/adb/file_sync_service.c
@@ -339,11 +339,14 @@ static int do_send(int s, char *path, char *buffer)
     if(!tmp || errno) {
         mode = 0644;
         is_link = 0;
+    } else {
+        struct stat st;
+        /* Don't delete files before copying if they are not "regular" */
+        if(lstat(path, &st) || S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
+            adb_unlink(path);
+        }
     }
 
-    adb_unlink(path);
-
-
 #ifdef HAVE_SYMLINKS
     if(is_link)
         ret = handle_send_link(s, path, buffer);