Mercurial > hg
view tests/test-sidedata.t @ 44758:45f3f35cefe7
copies: fix the changeset based algorithm regarding merge
In 99ebde4fec99, we changed the list of files stored into the `files` field.
This lead to the changeset centric copy algorithm to break in various merge
situation involving merge. Older information could reach the merge through
`p1`, and while information from `p2` was strictly fresher, it would get
overwritten anyway.
We update the situation with more details about which revision introduces rename
information. This help use making the right decision in case of merge.
We are now running a more comprehensive suite of test with include this kind of
situation. The behavior differ slightly from the filelog based in a couple of
instance. There is mostly two distinct cases:
1) there are conflicting rename information in a merge (different rename history
on each side). In this case the filelog based implementation arbitrarily pick a
side based on the file-revision-number. So it depends on a local factor. The
changeset centric algorithm will use a deterministic approach, by picking the
information coming from the first parent of the merge. This is stable across
different clone.
2) rename information related to file that exist in both source and destination.
The filelog based implementation do not even try to detect these, however the
changeset centric one get them for "free" (it is simpler to detect them than
not).
The new implementation focus on correctness. Performance improvement will come
later.
Differential Revision: https://phab.mercurial-scm.org/D8244
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
---|---|
date | Thu, 05 Mar 2020 17:55:05 +0100 |
parents | bca9d1a6c4c5 |
children | ea9563e9e65a |
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========================================================== Test file dedicated to checking side-data related behavior ========================================================== Check data can be written/read from sidedata ============================================ $ cat << EOF >> $HGRCPATH > [extensions] > testsidedata=$TESTDIR/testlib/ext-sidedata.py > EOF $ hg init test-sidedata --config format.exp-use-side-data=yes $ cd test-sidedata $ echo aaa > a $ hg add a $ hg commit -m a --traceback $ echo aaa > b $ hg add b $ hg commit -m b $ echo xxx >> a $ hg commit -m aa $ hg debugsidedata -c 0 2 sidedata entries entry-0001 size 4 entry-0002 size 32 $ hg debugsidedata -c 1 -v 2 sidedata entries entry-0001 size 4 '\x00\x00\x006' entry-0002 size 32 '\x98\t\xf9\xc4v\xf0\xc5P\x90\xf7wRf\xe8\xe27e\xfc\xc1\x93\xa4\x96\xd0\x1d\x97\xaaG\x1d\xd7t\xfa\xde' $ hg debugsidedata -m 2 2 sidedata entries entry-0001 size 4 entry-0002 size 32 $ hg debugsidedata a 1 2 sidedata entries entry-0001 size 4 entry-0002 size 32 Check upgrade behavior ====================== Right now, sidedata has not upgrade support Check that we can upgrade to sidedata ------------------------------------- $ hg init up-no-side-data --config format.exp-use-side-data=no $ hg debugformat -v -R up-no-side-data format-variant repo config default fncache: yes yes yes dotencode: yes yes yes generaldelta: yes yes yes sparserevlog: yes yes yes sidedata: no no no copies-sdc: no no no plain-cl-delta: yes yes yes compression: zlib zlib zlib compression-level: default default default $ hg debugformat -v -R up-no-side-data --config format.exp-use-side-data=yes format-variant repo config default fncache: yes yes yes dotencode: yes yes yes generaldelta: yes yes yes sparserevlog: yes yes yes sidedata: no yes no copies-sdc: no no no plain-cl-delta: yes yes yes compression: zlib zlib zlib compression-level: default default default $ hg debugupgraderepo -R up-no-side-data --config format.exp-use-side-data=yes > /dev/null Check that we can downgrade from sidedata ----------------------------------------- $ hg init up-side-data --config format.exp-use-side-data=yes $ hg debugformat -v -R up-side-data format-variant repo config default fncache: yes yes yes dotencode: yes yes yes generaldelta: yes yes yes sparserevlog: yes yes yes sidedata: yes no no copies-sdc: no no no plain-cl-delta: yes yes yes compression: zlib zlib zlib compression-level: default default default $ hg debugformat -v -R up-side-data --config format.exp-use-side-data=no format-variant repo config default fncache: yes yes yes dotencode: yes yes yes generaldelta: yes yes yes sparserevlog: yes yes yes sidedata: yes no no copies-sdc: no no no plain-cl-delta: yes yes yes compression: zlib zlib zlib compression-level: default default default $ hg debugupgraderepo -R up-side-data --config format.exp-use-side-data=no > /dev/null