cleanup update-mocks.sh

- remove unused tempdir
- use mktemp instead of creating tmpfile in repo
- normalize indent

hack/update-mocks.sh

@@ -26,16 +26,6 @@ source "${KUBE_ROOT}/hack/lib/init.sh"
 # Explicitly opt into go modules, even though we're inside a GOPATH directory
 export GO111MODULE=on
 
-_tmp="${KUBE_ROOT}/_tmp_build_tag_files"
-mkdir -p "${_tmp}"
-
-function cleanup {
-    rm -rf "$_tmp"
-    rm -f "tempfile"
-}
-
-trap cleanup EXIT
-
 kube::golang::verify_go_version
 kube::golang::setup_env
 
@@ -61,6 +51,10 @@ cd "${KUBE_ROOT}"
 
 GENERATED_MOCK_FILE_REGEX="^// Code generated by MockGen. DO NOT EDIT.$"
 
+# pick a tempfile path for writing to
+tmp=$(mktemp)
+kube::util::trap_add "rm -f ${tmp:?}" EXIT
+
 # We use this pattern here rather than `git grep` because we don't really want
 # to encode the pathspec list in multiple places and anything more complicated
 # just isn't worth the effort.
@@ -112,7 +106,7 @@ git ls-files -mo --exclude-standard -z | while read -r -d $'\0' file; do
     new_header=$(echo -e "//""$go_build_tag_string""\n""//" "$build_tag_string""\n" | cat - hack/boilerplate/boilerplate.generatego.txt)
 
     # ignore the first line (build tag) from the file
-    tail -n +3 "$file" > tempfile
+    tail -n +3 "$file" >"${tmp}"
   fi
 
   # if the file has only // +build !providerless header
@@ -122,7 +116,7 @@ git ls-files -mo --exclude-standard -z | while read -r -d $'\0' file; do
     new_header=$(echo -e "//" "$build_tag_string""\n" | cat - hack/boilerplate/boilerplate.generatego.txt)
 
     # ignore the first line (build tag) from the file
-    tail -n +2 "$file" > tempfile
+    tail -n +2 "$file" >"${tmp}"
   fi
 
   # if the file has only //go:build !providerless header
@@ -132,17 +126,17 @@ git ls-files -mo --exclude-standard -z | while read -r -d $'\0' file; do
     new_header=$(echo -e "//""$go_build_tag_string""\n" | cat - hack/boilerplate/boilerplate.generatego.txt)
 
     # ignore the first line (build tag) from the file
-    tail -n +2 "$file" > tempfile
+    tail -n +2 "$file" >"${tmp}"
   fi
 
   # if the header is generated
   if [ -n "$new_header" ]
   then
     # write the newly generated header file to the original file
-    echo -e "$new_header" | cat - tempfile > "$file"
+    echo -e "$new_header" | cat - "${tmp}" > "$file"
   else
     # if no build string insert at the top
-    cat hack/boilerplate/boilerplate.generatego.txt "$file" > tempfile && \
-    mv tempfile "$file"
+    cat hack/boilerplate/boilerplate.generatego.txt "$file" >"${tmp}" && \
+    mv "${tmp}" "$file"
   fi
 done