Automated rollback of commit 496d3de.

*** Reason for rollback ***

Roll-forward.

unknown commit fixed the internal protoc to also accept full paths, just as the external one does. Fixes bazelbuild#2265

*** Original change description ***

Automated rollback of commit bcd2355.

*** Reason for rollback ***

RELNOTES: None
PiperOrigin-RevId: 164324424

Author: buchgr

src/main/java/com/google/devtools/build/lib/rules/proto/ProtoCompileActionBuilder.java

@@ -596,7 +596,7 @@ static CustomCommandLine createCommandLineFromToolchains(
     }
 
     for (Artifact src : protosToCompile) {
-      cmdLine.addPath(src.getRootRelativePath());
+      cmdLine.addPath(src.getExecPath());
     }
 
     if (!allowServices) {

src/test/java/com/google/devtools/build/lib/rules/proto/ProtoCompileActionBuilderTest.java

@@ -106,6 +106,30 @@ public void commandLine_basic() throws Exception {
         .inOrder();
   }
 
+  @Test
+  public void commandline_derivedArtifact() {
+    // Verify that the command line contains the correct path to a generated protocol buffers.
+    SupportData supportData =
+        SupportData.create(
+            Predicates.<TransitiveInfoCollection>alwaysFalse(),
+            ImmutableList.of(derivedArtifact("//:dont-care", "source_file.proto")),
+            NestedSetBuilder.<Artifact>emptySet(STABLE_ORDER) /* protosInDirectDeps */,
+            NestedSetBuilder.<Artifact>emptySet(STABLE_ORDER) /* transitiveImports */,
+            true /* hasProtoSources */);
+
+    CustomCommandLine cmdLine =
+        createCommandLineFromToolchains(
+            ImmutableList.<ToolchainInvocation>of() /* toolchainInvocations */,
+            supportData.getDirectProtoSources(),
+            supportData.getTransitiveImports(),
+            null /* protosInDirectDeps */,
+            "//foo:bar",
+            true /* allowServices */,
+            ImmutableList.<String>of() /* protocOpts */);
+
+    assertThat(cmdLine.arguments()).containsExactly("out/source_file.proto");
+  }
+
   @Test
   public void commandLine_strictDeps() throws Exception {
     ProtoLangToolchainProvider toolchain =