From 9484d958ecc94b35182f92e5be31e7a1270b861b Mon Sep 17 00:00:00 2001
From: gregce <gregce@google.com>
Date: Tue, 18 Apr 2017 18:56:03 +0200
Subject: Fix crash on graph cycle in configuration loading

PiperOrigin-RevId: 153473961
---
 .../analysis/config/BuildConfigurationTest.java    | 58 ++++++++++++++++++++++
 1 file changed, 58 insertions(+)

(limited to 'src/test/java/com/google/devtools/build/lib/analysis')

diff --git a/src/test/java/com/google/devtools/build/lib/analysis/config/BuildConfigurationTest.java b/src/test/java/com/google/devtools/build/lib/analysis/config/BuildConfigurationTest.java
index d273f8c0f4..fe17b4773a 100644
--- a/src/test/java/com/google/devtools/build/lib/analysis/config/BuildConfigurationTest.java
+++ b/src/test/java/com/google/devtools/build/lib/analysis/config/BuildConfigurationTest.java
@@ -26,6 +26,8 @@ import com.google.devtools.build.lib.analysis.config.BuildConfiguration.Fragment
 import com.google.devtools.build.lib.analysis.util.ConfigurationTestCase;
 import com.google.devtools.build.lib.cmdline.Label;
 import com.google.devtools.build.lib.cmdline.RepositoryName;
+import com.google.devtools.build.lib.packages.NoSuchPackageException;
+import com.google.devtools.build.lib.packages.NoSuchTargetException;
 import com.google.devtools.build.lib.rules.cpp.CppConfiguration;
 import com.google.devtools.build.lib.rules.java.JavaConfiguration;
 import com.google.devtools.build.lib.rules.objc.J2ObjcConfiguration;
@@ -372,4 +374,60 @@ public class BuildConfigurationTest extends ConfigurationTestCase {
     BuildConfiguration cfg = createHost("--define=foo=bar");
     assertThat(cfg.getCommandLineBuildVariables().get("foo")).isEqualTo("bar");
   }
+
+  /**
+   * Returns a mock config fragment that loads the given label and does nothing else.
+   */
+  private static ConfigurationFragmentFactory createMockFragmentWithLabelDep(final String label) {
+    return new ConfigurationFragmentFactory() {
+      @Override
+      public Fragment create(ConfigurationEnvironment env, BuildOptions buildOptions)
+          throws InvalidConfigurationException, InterruptedException {
+        try {
+          env.getTarget(Label.parseAbsoluteUnchecked(label));
+        } catch (NoSuchPackageException e) {
+          fail("cannot load mock fragment's dep label " + label + ": " + e.getMessage());
+        } catch (NoSuchTargetException e) {
+          fail("cannot load mock fragment's dep label " + label + ": " + e.getMessage());
+        }
+        return new Fragment() {};
+      }
+
+      @Override
+      public Class<? extends Fragment> creates() {
+        return CppConfiguration.class;
+      }
+
+      @Override
+      public ImmutableSet<Class<? extends FragmentOptions>> requiredOptions() {
+        return ImmutableSet.<Class<? extends FragmentOptions>>of();
+      }
+    };
+  }
+
+  @Test
+  public void depLabelCycleOnConfigurationLoading() throws Exception {
+    configurationFactory =
+        new ConfigurationFactory(
+            analysisMock.createConfigurationCollectionFactory(),
+            createMockFragmentWithLabelDep("//foo"));
+    getScratch().file("foo/BUILD",
+        "load('//skylark:one.bzl', 'one')",
+        "cc_library(name = 'foo')");
+    getScratch().file("skylark/BUILD");
+    getScratch().file("skylark/one.bzl",
+        "load('//skylark:two.bzl', 'two')",
+        "def one():",
+        "  pass");
+    getScratch().file("skylark/two.bzl",
+        "load('//skylark:one.bzl', 'one')",
+        "def two():",
+        "  pass");
+    checkError(String.join("\n",
+        "ERROR <no location>: cycle detected in extension files: ",
+        "    foo/BUILD",
+        ".-> //skylark:one.bzl",
+        "|   //skylark:two.bzl",
+        "`-- //skylark:one.bzl"));
+  }
 }
-- 
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