Use cec_exports_repo for subproject export.

This replaces //tools/source_tree:export_source_tree with a dependency
on the external cec_exports_repo project.

Signed-off-by: format 20.02.05 <github.com/ChrisCummins/format>

WORKSPACE

@@ -3,6 +3,17 @@ workspace(name = "phd")
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive", "http_file")
 load("@bazel_tools//tools/build_defs/repo:git.bzl", "git_repository")
 
+http_archive(
+    name = "cec_exports_repo",
+    sha256 = "338001b0e2e3cea978b72a456ac201b86042aecbbbdb779694ac4b131e949fc2",
+    strip_prefix = "exports_repo-2020.05.06",
+    urls = ["https://github.com/ChrisCummins/exports_repo/archive/2020.05.06.tar.gz"],
+)
+
+load("@cec_exports_repo//tools/bzl:deps.bzl", "cec_exports_repo_deps")
+
+cec_exports_repo_deps()
+
 http_archive(
     name = "gtest",
     sha256 = "9bf1fe5182a604b4135edc1a425ae356c9ad15e9b23f9f12a02e80184c3a249c",

gpu/cldrive/BUILD

@@ -16,7 +16,7 @@
 # You should have received a copy of the GNU General Public License
 # along with cldrive.  If not, see <https://www.gnu.org/licenses/>.
 
-load("//tools/bzl:exports.bzl", "exports_repo")
+load("@cec_exports_repo//tools/bzl:exports_repo.bzl", "exports_repo")
 load("@io_bazel_rules_docker//cc:image.bzl", "cc_image")
 
 licenses(["restricted"])  # GPL v3
@@ -28,12 +28,12 @@ exports_files([
 
 exports_repo(
     name = "export",
-    github_repo = "cldrive",
-    move_file_mapping = {
+    path_rename = {
         "gpu/cldrive/README.md": "README.md",
         "gpu/cldrive/LICENSE": "LICENSE",
         "gpu/cldrive/travis.yml": ".travis.yml",
     },
+    remote = "[email protected]:ChrisCummins/cldrive.git",
     targets = [
         "//gpu/cldrive/...",
     ],