support "sideload over ADB" mode

Rather than depending on the existence of some place to store a file
that is accessible to users on an an unbootable device (eg, a physical
sdcard, external USB drive, etc.), add support for sideloading
packages sent to the device with adb.

This change adds a "minimal adbd" which supports nothing but receiving
a package over adb (with the "adb sideload" command) and storing it to
a fixed filename in the /tmp ramdisk, from where it can be verified
and sideloaded in the usual way.  This should be leave available even
on locked user-build devices.

The user can select "apply package from ADB" from the recovery menu,
which starts minimal-adb mode (shutting down any real adbd that may be
running).  Once minimal-adb has received a package it exits
(restarting real adbd if appropriate) and then verification and
installation of the received package proceeds.

Change-Id: I6fe13161ca064a98d06fa32104e1f432826582f5
diff --git a/ b/
index a94ecc6..7e48e7f 100644
--- a/
+++ b/
@@ -10,7 +10,8 @@
     roots.cpp \
     ui.cpp \
     screen_ui.cpp \
-    verifier.cpp
+    verifier.cpp \
+    adb_install.cpp
 LOCAL_MODULE := recovery
@@ -40,7 +41,7 @@
 LOCAL_STATIC_LIBRARIES += libext4_utils libz
-LOCAL_STATIC_LIBRARIES += libminzip libunz libmtdutils libmincrypt
+LOCAL_STATIC_LIBRARIES += libminzip libunz libmtdutils libmincrypt libminadbd
 LOCAL_STATIC_LIBRARIES += libminui libpixelflinger_static libpng libcutils
 LOCAL_STATIC_LIBRARIES += libstdc++ libc
@@ -67,6 +68,7 @@
 include $(commands_recovery_local_path)/minui/
 include $(commands_recovery_local_path)/minelf/
 include $(commands_recovery_local_path)/minzip/
+include $(commands_recovery_local_path)/minadbd/
 include $(commands_recovery_local_path)/mtdutils/
 include $(commands_recovery_local_path)/tools/
 include $(commands_recovery_local_path)/edify/