Add support for make verify WHAT=typecheck.

This will be used to make the typecheck job emit junit and avoids
duplicating the rest of the verify logic.

build/root/Makefile

@@ -112,10 +112,12 @@ define VERIFY_HELP_INFO
 #
 # Args:
 #   BRANCH: Branch to be passed to verify-godeps.sh script.
+#   WHAT: List of checks to run
 #
 # Example:
 #   make verify
 #   make verify BRANCH=branch_x
+#   make verify WHAT="bazel typecheck"
 endef
 .PHONY: verify
 ifeq ($(PRINT_HELP),y)

hack/make-rules/verify.sh

@@ -73,6 +73,17 @@ function is-quick {
   return 1
 }
 
+function is-explicitly-chosen {
+  local name="${1#verify-}"
+  name="${name%.*}"
+  for e in ${WHAT}; do
+    if [[ $e == "$name" ]]; then
+      return
+    fi
+  done
+  return 1
+}
+
 function run-cmd {
   local filename="${2##*/verify-}"
   local testname="${filename%%.*}"
@@ -109,6 +120,11 @@ function run-checks {
   for t in $(ls ${pattern})
   do
     local check_name="$(basename "${t}")"
+    if [[ ! -z ${WHAT:-} ]]; then
+      if ! is-explicitly-chosen "${check_name}"; then
+        continue
+      fi
+    else
       if is-excluded "${t}" ; then
         echo "Skipping ${check_name}"
         continue
@@ -117,6 +133,7 @@ function run-checks {
         echo "Skipping ${check_name} in quick mode"
         continue
       fi
+    fi
     echo -e "Verifying ${check_name}"
     local start=$(date +%s)
     run-cmd "${runner}" "${t}" && tr=$? || tr=$?