build: Optimize test-attribution-txt.sh to use go.mod, not vendor

Signed-off-by: Leonard Goodell <leonard.goodell@intel.com>

bin/test-attribution-txt.sh

@@ -9,46 +9,16 @@ EXIT_CODE=0
 
 cd "$GIT_ROOT"
 
-if [ -d vendor.bk ]; then
-    echo "vendor.bk exits - remove before continuing"
-    exit 1
-fi
-
-trap cleanup 0 1 2 3 6
-
-cleanup()
-{
-    cd "$GIT_ROOT"
-    # restore the vendor dir
-    rm -rf vendor
-    if [ -d vendor.bk ]; then
-        mv vendor.bk vendor
-    fi
-    exit $EXIT_CODE
-}
-
-# if the vendor directory exists, back it up so we can build a fresh one
-if [ -d vendor ]; then
-    mv vendor vendor.bk
-fi
-
-# create a vendor dir with the mod dependencies
-GO111MODULE=on go mod vendor
-
-# turn on nullglobbing so if there is nothing in cmd dir then we don't do
-# anything in this loop
-shopt -s nullglob
-
 if [ ! -f Attribution.txt ]; then
     echo "An Attribution.txt file is missing, please add"
     EXIT_CODE=1
 else
-    # loop over every library in the modules.txt file in vendor
+    # loop over every library in the go.mod file
     while IFS= read -r lib; do
-        if ! grep -q "$lib" Attribution.txt && [ "$lib" != "explicit" ] && [ "$lib" != "explicit;" ]; then
+        if ! grep -q "$lib" Attribution.txt; then
             echo "An attribution for $lib is missing from Attribution.txt, please add"
             # need to do this in a bash subshell, see SC2031
             (( EXIT_CODE=1 ))
         fi
-    done < <(grep '#' < "$GIT_ROOT/vendor/modules.txt" | awk '{print $2}')
+    done < <(cat $GIT_ROOT/go.mod | grep -v 'module ' | grep -v TODO | grep '/' | sed 's/require //' | sed 's/replace //' | awk '{print $1}')
 fi