[Request] [+- ] D10724: revlog: fix index computation during inline->non-inline transition

[joerg.sonnenberger (Joerg Sonnenberger)]

joerg.sonnenberger created this revision.
Herald added a reviewer: indygreg.
Herald added a reviewer: hg-reviewers.
Herald added a subscriber: mercurial-patches.

REVISION SUMMARY
  The computation 63edc384d3b7 <https://phab.mercurial-scm.org/rHG63edc384d3b7f497fba4c1797bab86eede583dca> failed to factor in the index entries
  themselve as revlog.start() doesn't count them. Fonud by Valtenin
  Gatienbaron with a precise test case from me.

REPOSITORY
  rHG Mercurial

BRANCH
  default

REVISION DETAIL
  https://phab.mercurial-scm.org/D10724

AFFECTED FILES
  mercurial/revlog.py
  tests/helper-killhook.py
  tests/test-transaction-rollback-on-revlog-split.t

CHANGE DETAILS

diff --git a/tests/test-transaction-rollback-on-revlog-split.t b/tests/test-transaction-rollback-on-revlog-split.t
new file mode 100644
--- /dev/null
+++ b/tests/test-transaction-rollback-on-revlog-split.t
@@ -0,0 +1,29 @@
+Test correctness of revlog inline -> non-inline transition
+----------------------------------------------------------
+
+Test offset computation to correctly factor in the index entries themselve.
+Test repo has one small, one moderate and one big change. The clone has
+the small and moderate change and will transition to non-inline storage when
+adding the big change.
+
+  $ hg init troffset-computation --config format.revlog-compression=none
+  $ cd troffset-computation
+  $ printf '% 20d' '1' > file
+  $ hg commit -Aqm_
+  $ printf '% 1024d' '1' > file
+  $ hg commit -Aqm_
+  $ dd if=/dev/zero of=file bs=1k count=128 > /dev/null 2>&1
+  $ hg commit -Aqm_
+  $ cd ..
+
+  $ hg clone -r 1 troffset-computation troffset-computation-copy --config format.revlog-compression=none -q
+  $ cd troffset-computation-copy
+  $ cat > .hg/hgrc <<EOF
+  > [hooks]
+  > pretxnchangegroup = python:$TESTDIR/helper-killhook.py:killme
+  > EOF
+  $ hg pull ../troffset-computation
+  pulling from ../troffset-computation
+  [80]
+  $ cat .hg/store/journal | tr -s '\000' ' ' | grep data/file | tail -1
+  data/file.i 128
diff --git a/tests/helper-killhook.py b/tests/helper-killhook.py
new file mode 100644
--- /dev/null
+++ b/tests/helper-killhook.py
@@ -0,0 +1,4 @@
+import os
+
+def killme(ui, repo, hooktype, **wkargs):
+    os._exit(80)
diff --git a/mercurial/revlog.py b/mercurial/revlog.py
--- a/mercurial/revlog.py
+++ b/mercurial/revlog.py
@@ -1985,7 +1985,7 @@
         with self._indexfp(b'r') as ifh, self._datafp(b'w') as dfh:
             for r in self:
                 dfh.write(self._getsegmentforrevs(r, r, df=ifh)[1])
-                if troffset <= self.start(r):
+                if troffset <= self.start(r) + r * self.index.entry_size:
                     trindex = r
 
         with self._indexfp(b'w') as fp:



To: joerg.sonnenberger, indygreg, #hg-reviewers
Cc: mercurial-patches, mercurial-devel
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