Mercurial > hg
view tests/test-missing-capability.t @ 42377:0546ead39a7e stable
manifest: avoid corruption by dropping removed files with pure (issue5801)
Previously, removed files would simply be marked by overwriting the first byte
with NUL and dropping their entry in `self.position`. But no effort was made to
ignore them when compacting the dictionary into text form. This allowed them to
slip into the manifest revision, since the code seems to be trying to minimize
the string operations by copying as large a chunk as possible. As part of this,
compact() walks the existing text based on entries in the `positions` list, and
consumed everything up to the next position entry. This typically resulted in
a ValueError complaining about unsorted manifest entries.
Sometimes it seems that files do get dropped in large repos- it seems to
correspond to there being a new entry that would take the same slot. A much
more trivial problem is that if the only changes were removals, `_compact()`
didn't even run because `__delitem__` doesn't add anything to `self.extradata`.
Now there's an explicit variable to flag this, both to allow `_compact()` to
run, and to avoid searching the manifest in cases where there are no removals.
In practice, this behavior was mostly obscured by the check in fastdelta() which
takes a different path that explicitly drops removed files if there are fewer
than 1000 changes. However, timeless has a repo where after rebasing tens of
commits, a totally different path[1] is taken that bypasses the change count
check and hits this problem.
[1] https://www.mercurial-scm.org/repo/hg/file/2338bdea4474/mercurial/manifest.py#l1511
author | Matt Harbison <matt_harbison@yahoo.com> |
---|---|
date | Thu, 23 May 2019 21:54:24 -0400 |
parents | d3cc9a8df63a |
children | 8d72e29ad1e0 |
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Checking how hg behaves when one side of a pull/push doesn't support some capability (because it's running an older hg version, usually). $ hg init repo1 $ cd repo1 $ echo a > a; hg add -q a; hg commit -q -m a $ hg bookmark a $ hg clone -q . ../repo2 $ cd ../repo2 $ touch $TESTTMP/disable-lookup.py $ disable_cap() { > rm -f $TESTTMP/disable-lookup.pyc # pyc caching is buggy > cat <<EOF > $TESTTMP/disable-lookup.py > from mercurial import extensions, wireprotov1server > def wcapabilities(orig, *args, **kwargs): > cap = orig(*args, **kwargs) > cap.remove(b'$1') > return cap > extensions.wrapfunction(wireprotov1server, '_capabilities', wcapabilities) > EOF > } $ cat >> ../repo1/.hg/hgrc <<EOF > [extensions] > disable-lookup = $TESTTMP/disable-lookup.py > EOF $ cat >> .hg/hgrc <<EOF > [ui] > ssh = "$PYTHON" "$TESTDIR/dummyssh" > EOF $ hg pull ssh://user@dummy/repo1 -r tip -B a pulling from ssh://user@dummy/repo1 no changes found $ disable_cap lookup $ hg pull ssh://user@dummy/repo1 -r tip -B a pulling from ssh://user@dummy/repo1 abort: other repository doesn't support revision lookup, so a rev cannot be specified. [255] $ disable_cap pushkey $ hg pull ssh://user@dummy/repo1 -r tip -B a pulling from ssh://user@dummy/repo1 abort: remote bookmark a not found! [255]