Add the deps_checker_label attribute

rules/jvm/private/label.bzl

@@ -5,23 +5,27 @@ load(
     _LabeledJarsData = "LabeledJarsData",
 )
 
+def get_labeled_jars(label, java_info, deps):
+    deps_labeled_jars = [dep[_LabeledJars] for dep in deps if _LabeledJars in dep]
+    return _LabeledJars(
+        label = label,
+        values = depset(
+            [
+                _LabeledJarsData(
+                    label = label,
+                    jars = depset(transitive = [java_info.compile_jars, java_info.full_compile_jars]),
+                ),
+            ],
+            order = "preorder",
+            transitive = [labeled_jars.values for labeled_jars in deps_labeled_jars],
+        ),
+    )
+
 def labeled_jars_implementation(target, ctx):
     if JavaInfo not in target:
         return []
 
-    deps_labeled_jars = [dep[_LabeledJars] for dep in getattr(ctx.rule.attr, "deps", []) if _LabeledJars in dep]
-    java_info = target[JavaInfo]
-    return [
-        _LabeledJars(
-            values = depset(
-                [
-                    _LabeledJarsData(
-                        label = ctx.label,
-                        jars = depset(transitive = [java_info.compile_jars, java_info.full_compile_jars]),
-                    ),
-                ],
-                order = "preorder",
-                transitive = [labeled_jars.values for labeled_jars in deps_labeled_jars],
-            ),
-        ),
-    ]
+    if _LabeledJars in target:
+        return []
+
+    return [get_labeled_jars(ctx.label, target[JavaInfo], getattr(ctx.rule.attr, "deps", []))]

rules/private/phases.bzl

@@ -7,6 +7,7 @@ load(":phases/phase_coda.bzl", _phase_coda = "phase_coda")
 load(":phases/phase_coverage_jacoco.bzl", _phase_coverage_jacoco = "phase_coverage_jacoco")
 load(":phases/phase_ijinfo.bzl", _phase_ijinfo = "phase_ijinfo")
 load(":phases/phase_javainfo.bzl", _phase_javainfo = "phase_javainfo")
+load(":phases/phase_labeledjars.bzl", _phase_labeledjars = "phase_labeledjars")
 load(":phases/phase_library_defaultinfo.bzl", _phase_library_defaultinfo = "phase_library_defaultinfo")
 load(":phases/phase_outputgroupinfo.bzl", _phase_outputgroupinfo = "phase_outputgroupinfo")
 load(":phases/phase_resources.bzl", _phase_resources = "phase_resources")
@@ -37,6 +38,8 @@ phase_ijinfo = _phase_ijinfo
 
 phase_javainfo = _phase_javainfo
 
+phase_labeledjars = _phase_labeledjars
+
 phase_library_defaultinfo = _phase_library_defaultinfo
 
 phase_outputgroupinfo = _phase_outputgroupinfo

rules/private/phases/phase_labeledjars.bzl

@@ -0,0 +1,12 @@
+load("//rules:providers.bzl", "LabeledJars")
+load("//rules/jvm:private/label.bzl", "get_labeled_jars")
+
+#
+# PHASE: labeledjars
+#
+# Outputs the `LabeledJars` provider if `deps_checker_label` is set.
+#
+
+def phase_labeledjars(ctx, g):
+    if ctx.attr.deps_checker_label != "":
+        g.out.providers.append(get_labeled_jars(ctx.attr.deps_checker_label, g.javainfo.java_info, ctx.attr.deps))

rules/private/phases/phase_zinc_depscheck.bzl

@@ -25,7 +25,16 @@ def phase_zinc_depscheck(ctx, g):
         deps_check = ctx.actions.declare_file("{}/depscheck_{}.success".format(ctx.label.name, name))
         deps_args = ctx.actions.args()
         deps_args.add(name, format = "--check_%s=true")
-        deps_args.add_all("--direct", [dep.label for dep in ctx.attr.deps], format_each = "_%s")
+
+        direct_dependency_labels = []
+
+        for dependency in ctx.attr.deps:
+            if _LabeledJars in dependency:
+                direct_dependency_labels.append(dependency[_LabeledJars].label)
+            else:
+                direct_dependency_labels.append(dependency.label)
+
+        deps_args.add_all("--direct", direct_dependency_labels, format_each = "_%s")
 
         # Check the comment on the function we're calling here to understand why
         # we're not using map_each

rules/providers.bzl

@@ -66,6 +66,7 @@ IntellijInfo = provider(
 LabeledJars = provider(
     doc = "Exported jars and their labels.",
     fields = {
+        "label": "The label of the target providing this provider.",
         "values": "The preorder depset of label and jars.",
     },
 )

rules/scala.bzl

@@ -19,6 +19,7 @@ load(
     _phase_coverage_jacoco = "phase_coverage_jacoco",
     _phase_ijinfo = "phase_ijinfo",
     _phase_javainfo = "phase_javainfo",
+    _phase_labeledjars = "phase_labeledjars",
     _phase_library_defaultinfo = "phase_library_defaultinfo",
     _phase_outputgroupinfo = "phase_outputgroupinfo",
     _phase_resources = "phase_resources",
@@ -75,7 +76,19 @@ _compile_private_attributes = {
     ),
 }
 
-_compile_attributes = {
+_deps_checker_label_attributes = {
+    "deps_checker_label": attr.string(
+        doc = """\
+The label to identify this target in the output of the dependency checker.
+
+By default, this is just the label of the target. But sometimes—for example, when overriding an artifact with
+`rules_jvm_external` to point to your own, or defining an alias to target—you want the dependency checker to suggest
+you add or remove a different label as a dependency. In that case, you can set this attribute to that label.
+""",
+    ),
+}
+
+_compile_attributes = _deps_checker_label_attributes | {
     "srcs": attr.label_list(
         cfg = _scala_outgoing_transition,
         doc = "The source Scala and Java files (and `-sources.jar` `.srcjar` `-src.jar` files of those).",
@@ -213,6 +226,7 @@ def _scala_library_implementation(ctx):
         ("resources", _phase_resources),
         ("classpaths", _phase_classpaths),
         ("javainfo", _phase_javainfo),
+        ("labeledjars", _phase_labeledjars),
         ("semanticdb", _phase_semanticdb),
         ("singlejar", _phase_singlejar),
         ("coverage", _phase_coverage_jacoco),
@@ -227,6 +241,7 @@ def _scala_binary_implementation(ctx):
         ("resources", _phase_resources),
         ("classpaths", _phase_classpaths),
         ("javainfo", _phase_javainfo),
+        ("labeledjars", _phase_labeledjars),
         ("semanticdb", _phase_semanticdb),
         ("singlejar", _phase_singlejar),
         ("coverage", _phase_coverage_jacoco),
@@ -242,6 +257,7 @@ def _scala_test_implementation(ctx):
         ("resources", _phase_resources),
         ("classpaths", _phase_classpaths),
         ("javainfo", _phase_javainfo),
+        ("labeledjars", _phase_labeledjars),
         ("semanticdb", _phase_semanticdb),
         ("singlejar", _phase_singlejar),
         ("coverage", _phase_coverage_jacoco),
@@ -458,6 +474,7 @@ To run: `bazel run <target>`
 scala_import = rule(
     attrs = _dicts.add(
         _scala_import_private_attributes,
+        _deps_checker_label_attributes,
         {
             "deps": attr.label_list(
                 doc = "Libraries used by this one.",

rules/scala/private/import.bzl

@@ -6,6 +6,7 @@ load(
     "//rules/common:private/utils.bzl",
     _separate_src_jars_srcs_and_other = "separate_src_jars_srcs_and_other",
 )
+load("//rules/jvm:private/label.bzl", "get_labeled_jars")
 
 scala_import_private_attributes = {
     "_java_toolchain": attr.label(
@@ -14,10 +15,6 @@ scala_import_private_attributes = {
 }
 
 def scala_import_implementation(ctx):
-    default_info = DefaultInfo(
-        files = depset(ctx.files.jars + ctx.files.srcjar),
-    )
-
     if ctx.files.jars:
         _src_jar, _, _jar = _separate_src_jars_srcs_and_other(ctx.files.jars)
         _src_jar += ctx.files.srcjar
@@ -66,9 +63,12 @@ def scala_import_implementation(ctx):
     else:
         java_info = java_common.merge([dep[JavaInfo] for dep in ctx.attr.deps])
 
-    intellij_info = create_intellij_info(ctx.label, ctx.attr.deps, java_info)
+    providers = [java_info, create_intellij_info(ctx.label, ctx.attr.deps, java_info)]
+
+    if ctx.attr.deps_checker_label != "":
+        providers.append(get_labeled_jars(ctx.attr.deps_checker_label, java_info, ctx.attr.deps))
 
-    return [intellij_info, java_info]
+    return providers
 
 def create_intellij_info(label, deps, java_info):
     # note: tried using transitive_exports from a JavaInfo that was given non-empty exports, but it was always empty

tests/dependencies/deps_checker_label/BUILD

@@ -0,0 +1,40 @@
+load("@rules_scala_annex//rules:scala.bzl", "scala_import", "scala_library")
+
+scala_library(
+    name = "library",
+    srcs = [],
+    deps_checker_label = "//dependencies/deps_checker_label:library-alias",
+    scala_toolchain_name = "test_zinc_2_13",
+)
+
+alias(
+    name = "library-alias",
+    actual = ":library",
+)
+
+scala_library(
+    name = "depends-on-library-alias",
+    srcs = [],
+    scala_toolchain_name = "test_zinc_2_13",
+    tags = ["manual"],
+    deps = [":library-alias"],
+)
+
+scala_import(
+    name = "import",
+    deps_checker_label = "//dependencies/deps_checker_label:import-alias",
+    jars = [],
+)
+
+alias(
+    name = "import-alias",
+    actual = ":import",
+)
+
+scala_library(
+    name = "depends-on-import-alias",
+    srcs = [],
+    scala_toolchain_name = "test_zinc_2_13",
+    tags = ["manual"],
+    deps = [":import-alias"],
+)

tests/dependencies/deps_checker_label/test

@@ -0,0 +1,8 @@
+#!/bin/bash -e
+. "$(dirname "$0")"/../../common.sh
+
+! bazel build :depends-on-library-alias || false
+bazel build :depends-on-library-alias |& grep "buildozer 'remove deps //dependencies/deps_checker_label:library-alias' //dependencies/deps_checker_label:depends-on-library-alias"
+
+! bazel build :depends-on-import-alias || false
+bazel build :depends-on-import-alias |& grep "buildozer 'remove deps //dependencies/deps_checker_label:import-alias' //dependencies/deps_checker_label:depends-on-import-alias"