diff --git a/tools/mainline_hook_partial.sh b/tools/mainline_hook_partial.sh
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diff --git a/tools/mainline_hook_project.sh b/tools/mainline_hook_project.sh
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+#!/bin/bash
+#set -x
+
+# called for repo projects that are part of the media mainline modules
+# this is for projects where the entire project is part of mainline.
+# we have a separate script for projects where only part of that project gets
+# pulled into mainline.
+#
+# if the project's PREUPLOAD.cfg points to this script, it is by definition a project
+# which is entirely within mainline.
+#
+# example PREUPLOAD.cfg using this script
+# [Hook Scripts]
+# mainline_hook = ${REPO_ROOT}/frameworks/av/tools/mainline_hook_project.sh
+#
+
+
+# tunables
+DEV_BRANCH=rvc-dev
+
+###
+RED=$(tput setaf 1)
+NORMAL=$(tput sgr0)
+
+## check the active branch:
+## * b131183694 d198c6a [goog/master] Fix to handle missing checks on error returned
+##
+current=`git branch -vv | grep -P "^\*[^\[]+\[goog/"|sed -e 's/^.*\[//' | sed -e 's/:.*$//'| sed -e 's/^goog\///'`
+if [ "${current}" = "" ] ; then
+        current=unknown
+fi
+
+if [ "${current}" = "${DEV_BRANCH}" ] ; then
+    # Change appears to be in mainline dev branch
+    exit 0
+fi
+
+## warn the user that about not being on the typical/desired branch.
+
+cat - <<EOF
+
+You are uploading repo  ${RED}${REPO_PATH}${NORMAL} to branch ${RED}${current}${NORMAL}. 
+The source of truth for ${RED}${REPO_PATH}${NORMAL} is branch ${RED}${DEV_BRANCH}${NORMAL}. 
+
+Please upload this change to branch ${RED}${DEV_BRANCH}${NORMAL} unless one or more of
+the following apply:
+- this is a security bug prohibited from disclosure before the next dessert release.
+  (moderate security bugs fall into this category).
+- this is new functionality prohibitied from disclosure before the next dessert release.
+EOF
+
+
+##
+## TODO: prompt the user y/n to continue right now instead of re-invoking with no-verify
+## this has to get around how repo buffers stdout from this script such that the output
+## is not flushed before we try to read the input.
+## 
+
+cat - <<EOF
+If you are sure you want to proceed uploading to branch ${RED}${current}${NORMAL},
+re-run your repo upload command with the '--no-verify' option
+
+EOF
+exit 1
+