Add a //file target to external jar repositories

Fixes https://github.com/bazelbuild/bazel/issues/990.

It's sometimes useful to be able to access the file pulled down
with maven_jar; for example, scala macro jars don't work with ijar,
so it's necessary to pull them into the compile-time classpath
unharmed.

--
Change-Id: I1d9e1cb30ea6fa56c18cbfcc68ee9b203524dfd4
Reviewed-on: https://bazel-review.googlesource.com/#/c/3550
MOS_MIGRATED_REVID=121379551

1 files changed, 10 insertions, 0 deletions

diff --git a/src/test/java/com/google/devtools/build/lib/rules/repository/JarDecompressorTest.java b/src/test/java/com/google/devtools/build/lib/rules/repository/JarDecompressorTest.java
index 852640287b..76ee90d559 100644
--- a/src/test/java/com/google/devtools/build/lib/rules/repository/JarDecompressorTest.java
+++ b/src/test/java/com/google/devtools/build/lib/rules/repository/JarDecompressorTest.java
@@ -50,6 +50,16 @@ public class JarDecompressorTest {
   }
 
   @Test
+  public void testTargets() throws Exception {
+    Path outputDir = DecompressorValue.decompress(descriptorBuilder.build());
+    assertThat(outputDir.exists()).isTrue();
+    String buildContent =
+        new String(FileSystemUtils.readContentAsLatin1(outputDir.getRelative("jar/BUILD")));
+    assertThat(buildContent).contains("java_import");
+    assertThat(buildContent).contains("filegroup");
+  }
+
+  @Test
   public void testWorkspaceGen() throws Exception {
     Path outputDir = DecompressorValue.decompress(descriptorBuilder.build());
     assertThat(outputDir.exists()).isTrue();