Rules for //:kustomize //:gcloud //:kubectl use :execpwd.

bazelbuild/bazel#3325

Tested:

    mkdir examples/tmp
    cd examples/tmp
    bazel run @com_benchsci_rules_kustomize//:kustomize -- create

Confirm a `kustomize.yaml` file is created in the working directory.
Previously, the tool would mutate the underlying runfiles directory.

BUILD

@@ -10,22 +10,38 @@ filegroup(
     srcs = ["exec.sh"],
 )
 
+filegroup(
+    name = "execpwd",
+    srcs = ["execpwd.sh"],
+)
+
 sh_binary(
     name = "kustomize",
-    srcs = ["@kustomize//:file"],
+    srcs = [":execpwd"],
+    args = ["$(location @kustomize//:file)"],
+    data = ["@kustomize//:file"],
 )
 
 sh_binary(
-    name = "kubectl",
+    name = "kubectl_bin",
     srcs = select({
         "@bazel_tools//src/conditions:linux_x86_64": ["@kubectl_linux//file"],
         "@bazel_tools//src/conditions:darwin": ["@kubectl_darwin//file"],
     }),
 )
 
+sh_binary(
+    name = "kubectl",
+    srcs = [":execpwd"],
+    args = ["$(location :kubectl_bin)"],
+    data = [":kubectl_bin"],
+)
+
 sh_binary(
     name = "gcloud",
-    srcs = ["@gcloud"],
+    srcs = [":execpwd"],
+    args = ["$(location @gcloud)"],
+    data = ["@gcloud"],
 )
 
 # Exported for documentation (see //tools:docs).

exec.sh

@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-exec $@
+exec "$@"

execpwd.sh

@@ -0,0 +1,26 @@
+#!/bin/sh
+# Copyright 2021 Benchsci Analytics Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# See https://github.com/bazelbuild/bazel/issues/3325
+if [ -z "${BUILD_WORKING_DIRECTORY-}" ]; then
+  echo "error BUILD_WORKING_DIRECTORY not set"
+  exit 1
+fi
+
+cmd="$( pwd )/${1}"
+cd "${BUILD_WORKING_DIRECTORY}"
+shift
+
+exec "${cmd}" "$@"