WIP: proof of concept for license splicing

WORKSPACE

@@ -57,6 +57,10 @@ kt_register_toolchains()
 # dependencies. So, we omit them to keep the WORKSPACE file simpler.
 # https://skydoc.bazel.build/docs/getting_started_stardoc.html
 
+load("//:set_license_classifier.bzl", "use_default_license_classifier")
+
+use_default_license_classifier()
+
 load("//:repositories.bzl", "rules_jvm_external_deps")
 
 rules_jvm_external_deps()

examples/android_instrumentation_test/WORKSPACE

@@ -14,6 +14,10 @@ local_repository(
     path = "../../",
 )
 
+load("//:set_license_classifier.bzl", "use_default_license_classifier")
+
+use_default_license_classifier()
+
 load("@rules_jvm_external//:defs.bzl", "maven_install")
 
 maven_install(

examples/android_kotlin_app/WORKSPACE

@@ -29,6 +29,10 @@ local_repository(
     path = "../../",
 )
 
+load("//:set_license_classifier.bzl", "use_default_license_classifier")
+
+use_default_license_classifier()
+
 load("@rules_jvm_external//:defs.bzl", "maven_install")
 
 maven_install(

examples/android_local_test/WORKSPACE

@@ -21,6 +21,10 @@ local_repository(
     path = "../../",
 )
 
+load("//:set_license_classifier.bzl", "use_default_license_classifier")
+
+use_default_license_classifier()
+
 load("@rules_jvm_external//:defs.bzl", "maven_install")
 
 maven_install(

examples/java-export/WORKSPACE

@@ -5,6 +5,10 @@ local_repository(
     path = "../../",
 )
 
+load("//:set_license_classifier.bzl", "use_default_license_classifier")
+
+use_default_license_classifier()
+
 load("@rules_jvm_external//:repositories.bzl", "rules_jvm_external_deps")
 
 rules_jvm_external_deps()

examples/kt_jvm_export/WORKSPACE

@@ -3,6 +3,10 @@ local_repository(
     path = "../../",
 )
 
+load("//:set_license_classifier.bzl", "use_default_license_classifier")
+
+use_default_license_classifier()
+
 load("@rules_jvm_external//:repositories.bzl", "rules_jvm_external_deps")
 
 rules_jvm_external_deps()

examples/pom_file_generation/WORKSPACE

@@ -5,6 +5,10 @@ local_repository(
     path = "../../",
 )
 
+load("//:set_license_classifier.bzl", "use_default_license_classifier")
+
+use_default_license_classifier()
+
 load("@rules_jvm_external//:defs.bzl", "maven_install")
 
 maven_install(

examples/protobuf-java/WORKSPACE

@@ -47,6 +47,10 @@ local_repository(
     path = "../..",
 )
 
+load("//:set_license_classifier.bzl", "use_default_license_classifier")
+
+use_default_license_classifier()
+
 load("@rules_jvm_external//:defs.bzl", "maven_install")
 
 maven_install(

examples/scala_akka/WORKSPACE

@@ -3,6 +3,10 @@ local_repository(
     path = "../../",
 )
 
+load("//:set_license_classifier.bzl", "use_default_license_classifier")
+
+use_default_license_classifier()
+
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 
 http_archive(

examples/simple/WORKSPACE

@@ -8,6 +8,10 @@ local_repository(
     path = "../../",
 )
 
+load("//:set_license_classifier.bzl", "use_default_license_classifier")
+
+use_default_license_classifier()
+
 load("@rules_jvm_external//:defs.bzl", "maven_install")
 
 maven_install(

examples/spring_boot/WORKSPACE

@@ -3,6 +3,10 @@ local_repository(
     path = "../../",
 )
 
+load("//:set_license_classifier.bzl", "use_default_license_classifier")
+
+use_default_license_classifier()
+
 load("@rules_jvm_external//:defs.bzl", "maven_install")
 
 maven_install(

license_demo/BUILD

@@ -0,0 +1,9 @@
+
+
+java_library(
+    name = "my_lib",
+    srcs = ["MyLib.java"],
+    deps = [
+        "@maven//:junit_junit",
+    ],
+)

license_demo/MyLib.java

@@ -0,0 +1,10 @@
+/**
+ * 
+ */
+final class MyLib {
+
+  public MyLib() {
+  }
+
+  int foo() { return 1; }
+}

license_demo/WORKSPACE

@@ -0,0 +1,62 @@
+# Copyright 2022 The Bazel Authors. All rights reserved.
+#
+# 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.
+
+workspace(name = "demo")
+
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+http_archive(
+    name = "rules_license",
+    urls = [
+        "https://mirror.bazel.build/github.com/bazelbuild/rules_license/releases/download/0.0.1/rules_license-0.0.1.tar.gz",
+    ],
+    sha256 = "4865059254da674e3d18ab242e21c17f7e3e8c6b1f1421fffa4c5070f82e98b5",
+)
+
+# You must expose your own license declarations as a repository so the rules
+# generated in @maven can point to them. Otherwise you would have to generate
+# the declarations in @maven.
+local_repository(
+  name = "my_compliance",
+  path = "compliance",
+)
+
+
+# Point to parent for testing. You would use http_archive in real life.
+local_repository(
+    name = "rules_jvm_external",
+    path = "..",
+)
+
+
+load("@rules_jvm_external//:set_license_classifier.bzl", "set_license_classifier")
+set_license_classifier(path="compliance")
+
+# You should never have to call this. rules_jvm_external_setup does it for you.
+#load("@rules_jvm_external//:set_license_classifier.bzl", "use_default_license_classifier")
+#use_default_license_classifier()
+
+load("@rules_jvm_external//:defs.bzl", "maven_install")
+
+maven_install(
+    artifacts = [
+        "junit:junit:4.12",
+        "com.google.guava:guava:28.0-jre",
+    ],
+    fetch_sources = True,
+    repositories = [
+        "http://uk.maven.org/maven2",
+        "https://jcenter.bintray.com/",
+    ],
+)

license_demo/compliance/BUILD

@@ -0,0 +1,16 @@
+# Organization local compliance rules go here
+
+load("@rules_license//rules:license.bzl", "license")
+
+package(
+    default_applicable_licenses = [":license"],
+    default_visibility = ["//visibility:public"],
+)
+
+license(
+    name = "apache",
+    license_kinds = [
+        "@rules_license//licenses/spdx:Apache-2.0"
+    ],
+    license_text = "LICENSE_apache.txt",
+)

license_demo/compliance/LICENSE_apache.txt

@@ -0,0 +1 @@
+apache license

license_demo/compliance/license_classifier.bzl

@@ -0,0 +1,9 @@
+"""Users will provider their own.
+
+This is a respository rule.
+"""
+
+
+def lookup_license(url=None, sha256=None, maven_id=None):
+    print("==================================== yes")
+    return "@my_compliance//:apache"

private/dependency_tree_parser.bzl

@@ -17,6 +17,7 @@ This file contains parsing functions to turn a JSON-like dependency tree
 into target declarations (jvm_import) for the final @maven//:BUILD file.
 """
 
+load("@rules_jvm_license_classifier//:license_classifier.bzl", "lookup_license")
 load("//private:coursier_utilities.bzl", "escape", "get_classifier", "get_packaging", "strip_packaging_and_classifier", "strip_packaging_and_classifier_and_version")
 
 JETIFY_INCLUDE_LIST_JETIFY_ALL = ["*"]
@@ -293,6 +294,12 @@ def _generate_imports(repository_ctx, dep_tree, explicit_artifacts, neverlink_ar
                 target_import_string.append("\tvisibility = [%s]," % (",".join(["\"%s\"" % v for v in default_visibilities])))
                 alias_visibility = "\tvisibility = [%s],\n" % (",".join(["\"%s\"" % v for v in default_visibilities]))
 
+
+            # Splice in the license
+            lic = lookup_license(maven_id = simple_coord)
+            if lic:
+               target_import_string.append("\tapplicable_licenses = [\"%s\"]," % lic)
+
             # 9. Finish the java_import rule.
             #
             # java_import(

repositories.bzl

@@ -1,5 +1,4 @@
 load("//:defs.bzl", "maven_install")
-load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 
 _DEFAULT_REPOSITORIES = [
     "https://repo1.maven.org/maven2",

set_license_classifier.bzl

@@ -0,0 +1,52 @@
+# Copyright 2022 The Bazel Authors. All rights reserved.
+#
+# 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.
+
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+def _ensure_rules_license():
+    if not native.existing_rule("rules_license"):
+        http_archive(
+            name = "rules_license",
+            urls = [
+                "https://mirror.bazel.build/github.com/bazelbuild/rules_license/releases/download/0.0.1/rules_license-0.0.1.tar.gz",
+            ],
+            sha256 = "4865059254da674e3d18ab242e21c17f7e3e8c6b1f1421fffa4c5070f82e98b5",
+        )
+
+
+def set_default_license_classifier_impl(rctx):
+    rctx.file("license_classifier.bzl", content = """
+def lookup_license(url=None, sha256=None, maven_id=None):
+    return None
+""")
+    rctx.file("BUILD", content = "")
+
+_set_default_license_classifier = repository_rule(
+    implementation=set_default_license_classifier_impl,
+)
+
+def use_default_license_classifier():
+    _ensure_rules_license()
+    if not native.existing_rule("rules_jvm_license_classifier"):
+        _set_default_license_classifier(
+            name = "rules_jvm_license_classifier",
+        )
+
+def set_license_classifier(path):
+    _ensure_rules_license()
+    if native.existing_rule("rules_jvm_license_classifier"):
+        fail("You are trying to set the rules_jvm_external license classifier a second time.")
+    native.local_repository(
+        name = "rules_jvm_license_classifier",
+        path = path)