Move the runfiles for external repositories to under the x.runfiles/ directory

This also sets the Bazel workspace name to io_bazel_source.

Fixes #848.

Relevant to #1116, #1124,

RELNOTES[INC]: All repositories are now directly under the x.runfiles directory in the runfiles tree (previously, external repositories were at x.runfiles/main-repo/external/other-repo. This simplifies handling remote repository runfiles considerably, but will break existing references to external repository runfiles.
---
Furthermore, if a Bazel project does not provide a workspace name in the WORKSPACE file, Bazel will now default to using __main__ as the workspace name (instead of "", as previously). The repository's runfiles will appear under x.runfiles/__main__/.

--
MOS_MIGRATED_REVID=120224534

1 files changed, 11 insertions, 0 deletions

diff --git a/src/test/java/com/google/devtools/build/lib/cmdline/RepositoryNameTest.java b/src/test/java/com/google/devtools/build/lib/cmdline/RepositoryNameTest.java
index b84af2fde6..9a39bbfda1 100644
--- a/src/test/java/com/google/devtools/build/lib/cmdline/RepositoryNameTest.java
+++ b/src/test/java/com/google/devtools/build/lib/cmdline/RepositoryNameTest.java
@@ -18,6 +18,7 @@ import static com.google.common.truth.Truth.assertThat;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.fail;
 
+import com.google.devtools.build.lib.vfs.PathFragment;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
@@ -56,4 +57,14 @@ public class RepositoryNameTest {
     assertNotValid("@foo\0", "workspace names may contain only A-Z, a-z, 0-9, '-', '_' and '.'");
   }
 
+  @Test
+  public void testRunfilesDir() throws Exception {
+    assertThat(RepositoryName.create("@foo").getRunfilesPath())
+        .isEqualTo(new PathFragment("../foo"));
+    assertThat(RepositoryName.create("@").getRunfilesPath())
+        .isEqualTo(PathFragment.EMPTY_FRAGMENT);
+    assertThat(RepositoryName.create("").getRunfilesPath())
+        .isEqualTo(PathFragment.EMPTY_FRAGMENT);
+  }
+
 }