Fixed the issue that hard links are handled improperly when bazel decompresses tarballs.

Issue link: https://github.com/bazelbuild/bazel/issues/574

--
MOS_MIGRATED_REVID=132434278

1 files changed, 34 insertions, 0 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/vfs/inmemoryfs/InMemoryFileSystem.java b/src/main/java/com/google/devtools/build/lib/vfs/inmemoryfs/InMemoryFileSystem.java
index dd974e55e4..e763ebe4e8 100644
--- a/src/main/java/com/google/devtools/build/lib/vfs/inmemoryfs/InMemoryFileSystem.java
+++ b/src/main/java/com/google/devtools/build/lib/vfs/inmemoryfs/InMemoryFileSystem.java
@@ -655,6 +655,11 @@ public class InMemoryFileSystem extends ScopeEscapableFileSystem {
   }
 
   @Override
+  public boolean supportsHardLinksNatively() {
+    return true;
+  }
+
+  @Override
   public boolean isFilePathCaseSensitive() {
     return true;
   }
@@ -931,4 +936,33 @@ public class InMemoryFileSystem extends ScopeEscapableFileSystem {
       throw Error.EACCES.exception(targetPath);
     }
   }
+
+  @Override
+  protected void createFSDependentHardLink(Path linkPath, Path originalPath)
+      throws IOException {
+
+    // Same check used when creating a symbolic link
+    if (originalPath.equals(rootPath)) {
+      throw Error.EACCES.exception(originalPath);
+    }
+
+    InMemoryDirectoryInfo linkParent;
+    synchronized (this) {
+      linkParent = getDirectory(linkPath.getParentDirectory());
+      // Same check used when creating a symbolic link
+      if (!linkParent.outOfScope()) {
+        if (linkParent.getChild(linkPath.getBaseName()) != null) {
+          throw Error.EEXIST.exception(linkPath);
+        }
+        insert(
+            linkParent,
+            linkPath.getBaseName(),
+            getDirectory(originalPath.getParentDirectory()).getChild(originalPath.getBaseName()),
+            linkPath);
+        return;
+      }
+    }
+    // If we get here, we're out of scope.
+    getDelegatedPath(linkParent.getEscapingPath(), originalPath).createHardLink(linkPath);
+  }
 }