Support multiple source roots.

PiperOrigin-RevId: 494993697
Change-Id: If42ff630db9e64dd3052d15d66deecb921396201

Author: coeuvre

src/main/java/com/google/devtools/build/lib/actions/FileArtifactValue.java

@@ -246,7 +246,7 @@ public static FileArtifactValue createFromStat(
         stat.isFile(),
         stat.getSize(),
         FileContentsProxy.create(stat),
-        /*digest=*/ null,
+        /* digest= */ null,
         xattrProvider);
   }
 
@@ -272,7 +272,7 @@ private static FileArtifactValue create(
   }
 
   public static FileArtifactValue createForVirtualActionInput(byte[] digest, long size) {
-    return new RegularFileArtifactValue(digest, /*proxy=*/ null, size);
+    return new RegularFileArtifactValue(digest, /* proxy= */ null, size);
   }
 
   public static FileArtifactValue createForUnresolvedSymlink(Path symlink) throws IOException {
@@ -305,7 +305,8 @@ public static FileArtifactValue createForNormalFile(
    */
   public static FileArtifactValue createForNormalFileUsingPath(
       Path path, long size, XattrProvider xattrProvider) throws IOException {
-    return create(path, /*isFile=*/ true, size, /*proxy=*/ null, /*digest=*/ null, xattrProvider);
+    return create(
+        path, /* isFile= */ true, size, /* proxy= */ null, /* digest= */ null, xattrProvider);
   }
 
   public static FileArtifactValue createForDirectoryWithHash(byte[] digest) {
@@ -322,7 +323,7 @@ public static FileArtifactValue createForDirectoryWithMtime(long mtime) {
    */
   public static FileArtifactValue createProxy(byte[] digest) {
     Preconditions.checkNotNull(digest);
-    return createForNormalFile(digest, /*proxy=*/ null, /*size=*/ 0);
+    return createForNormalFile(digest, /* proxy= */ null, /* size= */ 0);
   }
 
   private static String bytesToString(byte[] bytes) {
@@ -830,11 +831,17 @@ public boolean wasModifiedSinceDigest(Path path) {
    * required to resolve the content.
    */
   public static final class SourceFileArtifactValue extends FileArtifactValue {
+    private final PathFragment path;
     private final PathFragment execPath;
     private final byte[] digest;
     private final long size;
 
-    public SourceFileArtifactValue(PathFragment execPath, byte[] digest, long size) {
+    public SourceFileArtifactValue(
+        PathFragment path, PathFragment execPath, byte[] digest, long size) {
+      Preconditions.checkArgument(path.isAbsolute(), "path %s isn't absolute", path);
+      Preconditions.checkArgument(
+          path.endsWith(execPath), "path %s doesn't end with execPath %s", path, execPath);
+      this.path = path;
       this.execPath = Preconditions.checkNotNull(execPath);
       this.digest = Preconditions.checkNotNull(digest);
       this.size = size;
@@ -847,14 +854,19 @@ public boolean equals(Object o) {
       }
 
       SourceFileArtifactValue that = (SourceFileArtifactValue) o;
-      return Objects.equals(execPath, that.execPath)
+      return Objects.equals(path, that.path)
+          && Objects.equals(execPath, that.execPath)
           && Arrays.equals(digest, that.digest)
           && size == that.size;
     }
 
     @Override
     public int hashCode() {
-      return Objects.hash(execPath, Arrays.hashCode(digest), size);
+      return Objects.hash(path, execPath, Arrays.hashCode(digest), size);
+    }
+
+    public PathFragment getPath() {
+      return path;
     }
 
     public PathFragment getExecPath() {

src/test/java/com/google/devtools/build/lib/remote/BuildWithoutTheBytesIntegrationTestBase.java

@@ -579,6 +579,33 @@ public void treeOutputsFromLocalFileSystem_works() throws Exception {
     assertValidOutputFile("out/foobar.txt", "file-1\nbar\n");
   }
 
+  @Test
+  public void multiplePackagePaths_buildsSuccessfully() throws Exception {
+    write(
+        "../a/src/BUILD",
+        "genrule(",
+        "  name = 'foo',",
+        "  srcs = [],",
+        "  outs = ['out/foo.txt'],",
+        "  cmd = 'echo foo > $@',",
+        ")");
+    write(
+        "BUILD",
+        "genrule(",
+        "  name = 'foobar',",
+        "  srcs = ['//src:foo'],",
+        "  outs = ['out/foobar.txt'],",
+        "  cmd = 'cat $(location //src:foo) > $@ && echo bar >> $@',",
+        ")");
+    addOptions("--package_path=%workspace%:%workspace%/../a");
+    setDownloadToplevel();
+
+    buildTarget("//:foobar");
+    waitDownloads();
+
+    assertValidOutputFile("out/foobar.txt", "foo\nbar\n");
+  }
+
   @Test
   public void incrementalBuild_deleteOutputsInUnwritableParentDirectory() throws Exception {
     write(