Expose all label-classifiers to let consumer decide what to do

coursier.bzl

@@ -475,8 +475,7 @@ def _pinned_coursier_fetch_impl(repository_ctx):
     for artifact in dep_tree["dependencies"]:
         if artifact.get("url") != None:
             http_file_repository_name = escape(artifact["coord"])
-            if not get_classifier(artifact["coord"]) == "sources":
-                maven_artifacts.extend(["@%s//:%s" % (repository_ctx.attr.name, escape(strip_packaging_and_classifier(artifact["coord"])))])
+            maven_artifacts.extend([artifact])
             http_files.extend([
                 "    http_file(",
                 "        name = \"%s\"," % http_file_repository_name,
@@ -500,7 +499,16 @@ def _pinned_coursier_fetch_impl(repository_ctx):
 
     http_files.extend(_get_jq_http_files())
 
-    http_files.extend(["maven_artifacts = [%s]" % (",".join(["\"%s\"" % s for s in maven_artifacts]))])
+    http_files.extend([
+        "maven_artifacts = [%s]" % (",".join([
+            "struct(label = \"%s\", classifier = \"%s\")" %
+            (
+                "@%s//:%s" % (repository_ctx.attr.name, escape(strip_packaging_and_classifier(artifact["coord"]))),
+                get_classifier(artifact["coord"]),
+            )
+            for artifact in maven_artifacts
+        ])),
+    ])
 
     repository_ctx.file("defs.bzl", "\n".join(http_files), executable = False)
     repository_ctx.file(