Migrate to Bzlmod. WORKSPACE files were deprecated in Bazel 8, and won't be supported in 9.

Signed-off-by: Steffen Smolka <steffen.smolka@gmail.com>

Author: smolkaj

.github/workflows/ci-build-proto.yml

@@ -14,13 +14,22 @@ on:
 
 jobs:
   build:
+
     strategy:
       matrix:
-        os:
-          - ubuntu-22.04
-          - ubuntu-24.04
-          - ubuntu-latest
+        # We only test on the oldest version we want to support and latest, and
+        # hope things also work for versions in the middle.
+        os: [ubuntu-22.04, ubuntu-latest]
+        bazel_version: [6.x, latest]
+      # Don't abort other runs when one of them fails, to ease debugging.
+      fail-fast: false
+
     runs-on: ${{ matrix.os }}
+
+    env:
+      USE_BAZEL_VERSION: ${{ matrix.bazel_version }}
+      KEY: bazel-${{ matrix.bazel_version }}-${{ matrix.os }}
+
     steps:
     - uses: actions/checkout@v4
       with:
@@ -33,9 +42,9 @@ jobs:
         path: "~/.cache/bazel"
         # Create a new cache entry whenever Bazel files change.
         # See https://docs.github.com/en/actions/guides/caching-dependencies-to-speed-up-workflows
-        key: bazel-${{ matrix.os }}-${{ hashFiles('**/*.bazel*') }}
+        key: ${{ env.KEY }}-${{ hashFiles('**/*.bazel*', '**/*.bzl') }}
         restore-keys: |
-          bazel-${{ matrix.os }}-
+          ${{ env.KEY }}
 
     - name: Save start time
       uses: josStorer/get-current-time@v2
@@ -85,4 +94,4 @@ jobs:
       if: always() && (github.ref_name == 'main' || env.duration > 300)
       with:
         path: "~/.cache/bazel"
-        key: bazel-${{ matrix.os }}-${{ hashFiles('**/*.bazel*') }}-${{ github.run_id }}
+        key: ${{ env.KEY }}-${{ hashFiles('**/*.bazel*', '**/*.bzl') }}-${{ github.run_id }}

.gitignore

@@ -2,6 +2,7 @@
 *~
 docs/v1/build/
 bazel-*
+*.lock
 .DS_Store
 build
 dist

proto/.bazelversion

@@ -0,0 +1,38 @@
+module(
+    name = "p4runtime",
+    repo_name = "com_github_p4lang_p4runtime",
+)
+
+bazel_dep(name = "bazel_skylib", version = "1.7.1")
+
+bazel_dep(
+    name = "googleapis",
+    version = "0.0.0-20240819-fe8ba054a",
+    repo_name = "com_google_googleapis",
+)
+switched_rules = use_extension("@com_google_googleapis//:extensions.bzl", "switched_rules")
+switched_rules.use_languages(
+    cc = True,
+    go = True,
+    grpc = True,
+    python = True,
+)
+use_repo(switched_rules, "com_google_googleapis_imports")
+
+bazel_dep(name = "grpc", version = "1.68.0", repo_name = "com_github_grpc_grpc")
+
+bazel_dep(
+    name = "protobuf",
+    version = "29.1",
+    repo_name = "com_google_protobuf",
+    )
+
+bazel_dep(name = "rules_license", version = "1.0.0")
+
+bazel_dep(name = "rules_proto", version = "7.0.2")
+
+bazel_dep(
+    name = "rules_go",
+    version = "0.50.1",
+    repo_name = "io_bazel_rules_go",
+)

proto/MODULE.bazel

@@ -0,0 +1,5 @@
+# https://bazel.build/external/migration#workspace.bzlmod
+#
+# This file is intentionally empty. When bzlmod is enabled and this
+# file exists, the contents of WORKSPACE.bazel is ignored. This prevents
+# bzlmod builds from unintentionally depending on the WORKSPACE.bazel file.