klte-common: Add releasetools extension to install variant blobs

* General idea shamelessly kanged from m8
* Copy instead of symlink because we need the libril shim and doing
  that for each variant is non-scaleable
* Will only be used if explicitly called-for by dependent devices

Change-Id: I15b4b25d3e1b8856a9f8df2f2c6b72c0e55a6d66

releasetools/releasetools.py

@@ -0,0 +1,25 @@
+# Copyright (C) 2017 The LineageOS Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+""" Custom OTA commands for klte devices """
+
+import common
+import re
+import os
+
+def FullOTA_InstallEnd(info):
+  info.script.Mount("/system")
+  info.script.AppendExtra('assert(run_program("/tmp/install/bin/variant_blobs.sh") == 0);')
+  info.script.Unmount("/system")

releasetools/variant_blobs.sh

@@ -0,0 +1,58 @@
+#!/sbin/sh
+#
+# Copyright (C) 2017 The LineageOS Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+set -e
+
+better_copy()
+{
+  cp -dp "$1" "$2"
+  # symlinks don't have a context
+  if [ ! -L "$1" ]; then
+    # it is assumed that every label starts with 'u:object_r' and has no white-spaces
+    local context=`ls -Z "$1" | grep -o 'u:object_r:[^ ]*' | head -1`
+    chcon -v "$context" "$2"
+  fi
+}
+
+
+# Detect variant and copy its specific-blobs
+BOOTLOADER=`getprop ro.bootloader`
+
+case $BOOTLOADER in
+  G900V*)      VARIANT="vzw" ;;
+  *)           VARIANT="gsm" ;;
+esac
+
+BLOBBASE=/system/blobs/$VARIANT
+
+if [ -d $BLOBBASE ]; then
+  cd $BLOBBASE
+
+  for FILE in `find . -type f` ; do
+    mkdir -p `dirname /system/$FILE`
+    better_copy $FILE /system/$FILE
+  done
+
+  for FILE in bin/* ; do
+    chmod 755 /system/$FILE
+  done
+else
+  echo "Expected source directory does not exist!"
+  exit 1
+fi
+
+exit 0