Copy reclient binaries into the out directory itself

This is to avoid the problem of multiple source commands / builds run in parallel overwriting the binaries in the reclient dir.

TESTED=ran concurrent builds, ensured binaries weren't being overwritten.

Bug: b/302378775

NOTE FOR REVIEWERS - original patch and result patch are not identical.
PLEASE REVIEW CAREFULLY.
Diffs between the patches:
 fi
+  local RECLIENT_VERSION=`readlink prebuilts/remoteexecution-client/live`
+
+  local NONCOG_RECLIENT_BIN_DIR_BASE="${OUT_DIR}/.reclient"
+  local NONCOG_RECLIENT_BIN_DIR="${NONCOG_RECLIENT_BIN_DIR_BASE}/${RECLIENT_VERSION}"
+  if [ -d "${NONCOG_RECLIENT_BIN_DIR}" ]; then
+    if [ `ls ${NONCOG_RECLIENT_BIN_DIR} | wc -l` -gt 1 ] ; then
+      # binaries already exist, only update the symlink to ensure correct
+      # reclient version is set.
+      ln -sf ${RECLIENT_VERSION} ${NONCOG_RECLIENT_BIN_DIR_BASE}/live
+      return
+    fi
+  # Create the non cog directory and copy binaries into it.
+  mkdir -p ${NONCOG_RECLIENT_BIN_DIR}
-
-  # Copy the binaries out of live.
-  cp $TOP/prebuilts/remoteexecution-client/live/* $NONCOG_RECLIENT_BIN_DIR
+  cp ${TOP}/prebuilts/remoteexecution-client/live/* ${NONCOG_RECLIENT_BIN_DIR}
+  ln -sf ${RECLIENT_VERSION} ${NONCOG_RECLIENT_BIN_DIR_BASE}/live
-  export RBE_DIR=$NONCOG_RECLIENT_BIN_DIR
+  export RBE_DIR="${NONCOG_RECLIENT_BIN_DIR_BASE}/live"

Original patch:
 diff a/cogsetup.sh b/cogsetup.sh
--- a/cogsetup.sh
+++ b/cogsetup.sh
@@ -39,22 +39,30 @@
 # non-cog part of the overall filesystem.  This is to workaround the problem
 # described in b/289391270.
 function _copy_reclient_binaries_from_cog() {
-  local NONCOG_RECLIENT_BIN_DIR="${HOME}/.cog/reclient/bin"
-  if [ ! -d "$NONCOG_RECLIENT_BIN_DIR" ]; then
-    # Create the non cog directory if it doesn't exist.
-    mkdir -p ${NONCOG_RECLIENT_BIN_DIR}
-  else
-    # Clear out the non cog directory if it does exist.
-    rm -f ${NONCOG_RECLIENT_BIN_DIR}/*
+  if [[ "${OUT_DIR}" == "" ]]; then
+    OUT_DIR="out"
   fi
+  local RECLIENT_VERSION=`readlink prebuilts/remoteexecution-client/live`
 
-  local TOP=$(gettop)
+  local NONCOG_RECLIENT_BIN_DIR_BASE="${OUT_DIR}/.reclient"
+  local NONCOG_RECLIENT_BIN_DIR="${NONCOG_RECLIENT_BIN_DIR_BASE}/${RECLIENT_VERSION}"
+  if [ -d "${NONCOG_RECLIENT_BIN_DIR}" ]; then
+    if [ `ls ${NONCOG_RECLIENT_BIN_DIR} | wc -l` -gt 1 ] ; then
+      # binaries already exist, only update t

Change-Id: Ia6cb7faae6366ee7491fcf91777318b772a3ba88