Mercurial > hg
diff tests/test-revlog.t @ 49209:2dd53a33aefa stable
test-revlog: test a repository that contains a diff against nullrev
We are witnessing a crash in the rust code, so we lets make sure this case is
tested.
author | Arseniy Alekseyev <aalekseyev@janestreet.com> |
---|---|
date | Sun, 22 May 2022 23:26:06 +0200 |
parents | 3a9f3470922c |
children | cc92ad0e8185 |
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--- a/tests/test-revlog.t Tue May 17 14:36:57 2022 -0400 +++ b/tests/test-revlog.t Sun May 22 23:26:06 2022 +0200 @@ -32,6 +32,7 @@ Test for CVE-2016-3630 + $ mkdir test2; cd test2 $ hg init >>> import codecs @@ -52,3 +53,37 @@ >>> rl = revlog.revlog(tvfs, target=(KIND_OTHER, b'test'), radix=b'a') >>> rl.revision(1) mpatchError(*'patch cannot be decoded'*) (glob) + + $ cd .. + + +Regression test for support for the old repos with strange diff encoding. +Apparently it used to be possible (maybe it's still possible, but we don't know how) +to create commits whose diffs are encoded relative to a nullrev. +This test checks that a repo with that encoding can still be read. + +This is what we did to produce the repo in test-revlog-diff-relative-to-nullrev.tar: + +- tweak the code in mercurial/revlogutils/deltas.py to produce such "trivial" deltas: +> if deltainfo is None: +> - deltainfo = self._fullsnapshotinfo(fh, revinfo, target_rev) +> + deltainfo = self._builddeltainfo(revinfo, nullrev, fh) +- hg init +- echo hi > a +- hg commit -Am_ +- remove some cache files + + $ tar --force-local -xf "$TESTDIR"/bundles/test-revlog-diff-relative-to-nullrev.tar + $ cd nullrev-diff + $ hg debugdeltachain a + rev chain# chainlen prev delta size rawsize chainsize ratio lindist extradist extraratio readsize largestblk rddensity srchunks + 0 1 2 -1 p1 15 3 15 5.00000 15 0 0.00000 15 15 1.00000 1 +#if rhg + $ hg cat --config rhg.cat=true -r 0 a + abort: corrupted revlog + [255] +#else + $ hg cat --config rhg.cat=true -r 0 a + hi +#endif + $ cd ..