Allow make to run from outside GOPATH

Makefile.generated_files

@@ -199,7 +199,7 @@ DEEPCOPY_FILES := $(addsuffix /$(DEEPCOPY_FILENAME), $(DEEPCOPY_DIRS))
 .PHONY: gen_deepcopy
 gen_deepcopy: $(DEEPCOPY_FILES)
 	if [[ -f $(META_DIR)/$(DEEPCOPY_GEN).todo ]]; then                  \
-	    $(DEEPCOPY_GEN)                                               \
+	    ./hack/run-in-gopath.sh $(DEEPCOPY_GEN)                         \
 	        -i $$(cat $(META_DIR)/$(DEEPCOPY_GEN).todo | paste -sd, -)  \
 	        --bounding-dirs $(PRJ_SRC_PATH)                             \
 	        -O $(DEEPCOPY_BASENAME);                                    \
@@ -243,6 +243,7 @@ $(META_DIR)/$(DEEPCOPY_GEN).mk:
 	     -f '{{range .Deps}}{{.}}{{"\n"}}{{end}}'          \
 	     ./cmd/libs/go2idl/deepcopy-gen                    \
 	     | grep "^$(PRJ_SRC_PATH)"                         \
+	     | sed 's|^$(PRJ_SRC_PATH)|./|'                    \
 	     | xargs go list -e -f '{{.Dir}} {{.Dir}}/*.go');  \
 	echo $$DIRECT $$INDIRECT | sed 's/ / =,/g' | tr '=,' '\n\t'; \
 	) | sed "s|$$(pwd -P)/||" > $@.tmp;                    \
@@ -309,7 +310,7 @@ CONVERSION_FILES := $(addsuffix /$(CONVERSION_FILENAME), $(CONVERSION_DIRS))
 .PHONY: gen_conversion
 gen_conversion: $(CONVERSION_FILES)
 	if [[ -f $(META_DIR)/$(CONVERSION_GEN).todo ]]; then                  \
-	    $(CONVERSION_GEN)                                               \
+	    ./hack/run-in-gopath.sh $(CONVERSION_GEN)                         \
 	        -i $$(cat $(META_DIR)/$(CONVERSION_GEN).todo | paste -sd, -)  \
 	        -O $(CONVERSION_BASENAME);                                    \
 	fi
@@ -419,6 +420,7 @@ $(META_DIR)/$(CONVERSION_GEN).mk:
 	     -f '{{range .Deps}}{{.}}{{"\n"}}{{end}}'          \
 	     ./cmd/libs/go2idl/conversion-gen                  \
 	     | grep "^$(PRJ_SRC_PATH)"                         \
+	     | sed 's|^$(PRJ_SRC_PATH)|./|'                    \
 	     | xargs go list -e -f '{{.Dir}} {{.Dir}}/*.go');  \
 	echo $$DIRECT $$INDIRECT | sed 's/ / =,/g' | tr '=,' '\n\t'; \
 	) | sed "s|$$(pwd -P)/||" > $@.tmp;                    \

hack/run-in-gopath.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+# Copyright 2016 The Kubernetes Authors.
+#
+# 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.
+
+# This script sets up a temporary Kubernetes GOPATH and runs an arbitrary
+# command under it.  Go tooling requires that the current directory be under
+# GOPATH or else it fails to find some things, such as the vendor directory for
+# the project.
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+KUBE_ROOT=$(dirname "${BASH_SOURCE}")/..
+source "${KUBE_ROOT}/hack/lib/init.sh"
+
+# This sets up a clean GOPATH and makes sure we are currently in it.
+kube::golang::setup_env
+
+# Run the user-provided command.
+"${@}"