shallowbundle: demonstrate circular node dependency happens

Summary: Without the previous fix, this would be an infinite loop.

Reviewed By: DurhamG

Differential Revision: D9174385

fbshipit-source-id: a2529c687768f73382f9e23984ada7ebcb384b2b

tests/test-fb-hgext-remotefilelog-bundleloop.t

@@ -0,0 +1,27 @@
+  $ setconfig remotefilelog.cachepath=$TESTTMP/cache extensions.remotefilelog=
+
+  $ newrepo
+  $ echo remotefilelog >> .hg/requires
+  $ drawdag <<'EOS'
+  > E  # E/X=1 (renamed from Y)
+  > |
+  > D  # D/Y=3 (renamed from X)
+  > |
+  > B  # B/X=2
+  > |
+  > A  # A/X=1
+  > EOS
+
+  $ hg bundle --all $TESTTMP/bundle --traceback -q
+
+  $ newrepo
+  $ echo remotefilelog >> .hg/requires
+  $ hg unbundle $TESTTMP/bundle
+  adding changesets
+  adding manifests
+  adding file changes
+  transaction abort!
+  rollback completed
+  abort: circular node dependency
+  [255]
+