Mercurial > hg
view tests/test-clone-r.t @ 23702:c48924787eaa
filectx.parents: enforce changeid of parent to be in own changectx ancestors
Because of the way filenodes are computed, you can have multiple changesets
"introducing" the same file revision. For example, in the changeset graph
below, changeset 2 and 3 both change a file -to- and -from- the same content.
o 3: content = new
|
| o 2: content = new
|/
o 1: content = old
In such cases, the file revision is create once, when 2 is added, and just reused
for 3. So the file change in '3' (from "old" to "new)" has no linkrev pointing
to it). We'll call this situation "linkrev-shadowing". As the linkrev is used for
optimization purposes when walking a file history, the linkrev-shadowing
results in an unexpected jump to another branch during such a walk.. This leads to
multiple bugs with log, annotate and rename detection.
One element to fix such bugs is to ensure that walking the file history sticks on
the same topology as the changeset's history. For this purpose, we extend the
logic in 'basefilectx.parents' so that it always defines the proper changeset
to associate the parent file revision with. This "proper" changeset has to be an
ancestor of the changeset associated with the child file revision.
This logic is performed in the '_adjustlinkrev' function. This function is
given the starting changeset and all the information regarding the parent file
revision. If the linkrev for the file revision is an ancestor of the starting
changeset, the linkrev is valid and will be used. If it is not, we detected a
topological jump caused by linkrev shadowing, we are going to walk the
ancestors of the starting changeset until we find one setting the file to the
revision we are trying to create.
The performance impact appears acceptable:
- We are walking the changelog once for each filelog traversal (as there should
be no overlap between searches),
- changelog traversal itself is fairly cheap, compared to what is likely going
to be perform on the result on the filelog traversal,
- We only touch the manifest for ancestors touching the file, And such
changesets are likely to be the one introducing the file. (except in
pathological cases involving merge),
- We use manifest diff instead of full manifest unpacking to check manifest
content, so it does not involve applying multiple diffs in most case.
- linkrev shadowing is not the common case.
Tests for fixed issues in log, annotate and rename detection have been
added.
But this changeset does not solve all problems. It fixes -ancestry-
computation, but if the linkrev-shadowed changesets is the starting one, we'll
still get things wrong. We'll have to fix the bootstrapping of such operations
in a later changeset. Also, the usage of `hg log FILE` without --follow still
has issues with linkrev pointing to hidden changesets, because it relies on the
`filelog` revset which implement its own traversal logic that is still to be
fixed.
Thanks goes to:
- Matt Mackall: for nudging me in the right direction
- Julien Cristau and RĂ©mi Cardona: for keep telling me linkrev bug were an
evolution show stopper for 3 years.
- Durham Goode: for finding a new linkrev issue every few weeks
- Mads Kiilerich: for that last rename bug who raise this topic over my
anoyance limit.
author | Pierre-Yves David <pierre-yves.david@fb.com> |
---|---|
date | Tue, 23 Dec 2014 15:30:38 -0800 |
parents | b87acfda5268 |
children | 30be3aeb5344 |
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$ hg init test $ cd test $ echo 0 >> afile $ hg add afile $ hg commit -m "0.0" $ echo 1 >> afile $ hg commit -m "0.1" $ echo 2 >> afile $ hg commit -m "0.2" $ echo 3 >> afile $ hg commit -m "0.3" $ hg update -C 0 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ echo 1 >> afile $ hg commit -m "1.1" created new head $ echo 2 >> afile $ hg commit -m "1.2" $ echo a line > fred $ echo 3 >> afile $ hg add fred $ hg commit -m "1.3" $ hg mv afile adifferentfile $ hg commit -m "1.3m" $ hg update -C 3 1 files updated, 0 files merged, 2 files removed, 0 files unresolved $ hg mv afile anotherfile $ hg commit -m "0.3m" $ hg debugindex -f 1 afile rev flag offset length size ..... link p1 p2 nodeid (re) 0 0000 0 3 2 ..... 0 -1 -1 362fef284ce2 (re) 1 0000 3 5 4 ..... 1 0 -1 125144f7e028 (re) 2 0000 8 7 6 ..... 2 1 -1 4c982badb186 (re) 3 0000 15 9 8 ..... 3 2 -1 19b1fc555737 (re) $ hg debugindex adifferentfile rev offset length ..... linkrev nodeid p1 p2 (re) 0 0 75 ..... 7 2565f3199a74 000000000000 000000000000 (re) $ hg debugindex anotherfile rev offset length ..... linkrev nodeid p1 p2 (re) 0 0 75 ..... 8 2565f3199a74 000000000000 000000000000 (re) $ hg debugindex fred rev offset length ..... linkrev nodeid p1 p2 (re) 0 0 8 ..... 6 12ab3bcc5ea4 000000000000 000000000000 (re) $ hg debugindex --manifest rev offset length ..... linkrev nodeid p1 p2 (re) 0 0 48 ..... 0 43eadb1d2d06 000000000000 000000000000 (re) 1 48 48 ..... 1 8b89697eba2c 43eadb1d2d06 000000000000 (re) 2 96 48 ..... 2 626a32663c2f 8b89697eba2c 000000000000 (re) 3 144 48 ..... 3 f54c32f13478 626a32663c2f 000000000000 (re) 4 192 .. ..... 6 de68e904d169 626a32663c2f 000000000000 (re) 5 2.. 68 ..... 7 09bb521d218d de68e904d169 000000000000 (re) 6 3.. 54 ..... 8 1fde233dfb0f f54c32f13478 000000000000 (re) $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files 4 files, 9 changesets, 7 total revisions $ cd .. $ for i in 0 1 2 3 4 5 6 7 8; do > echo > echo ---- hg clone -r "$i" test test-"$i" > hg clone -r "$i" test test-"$i" > cd test-"$i" > hg verify > cd .. > done ---- hg clone -r 0 test test-0 adding changesets adding manifests adding file changes added 1 changesets with 1 changes to 1 files updating to branch default 1 files updated, 0 files merged, 0 files removed, 0 files unresolved checking changesets checking manifests crosschecking files in changesets and manifests checking files 1 files, 1 changesets, 1 total revisions ---- hg clone -r 1 test test-1 adding changesets adding manifests adding file changes added 2 changesets with 2 changes to 1 files updating to branch default 1 files updated, 0 files merged, 0 files removed, 0 files unresolved checking changesets checking manifests crosschecking files in changesets and manifests checking files 1 files, 2 changesets, 2 total revisions ---- hg clone -r 2 test test-2 adding changesets adding manifests adding file changes added 3 changesets with 3 changes to 1 files updating to branch default 1 files updated, 0 files merged, 0 files removed, 0 files unresolved checking changesets checking manifests crosschecking files in changesets and manifests checking files 1 files, 3 changesets, 3 total revisions ---- hg clone -r 3 test test-3 adding changesets adding manifests adding file changes added 4 changesets with 4 changes to 1 files updating to branch default 1 files updated, 0 files merged, 0 files removed, 0 files unresolved checking changesets checking manifests crosschecking files in changesets and manifests checking files 1 files, 4 changesets, 4 total revisions ---- hg clone -r 4 test test-4 adding changesets adding manifests adding file changes added 2 changesets with 2 changes to 1 files updating to branch default 1 files updated, 0 files merged, 0 files removed, 0 files unresolved checking changesets checking manifests crosschecking files in changesets and manifests checking files 1 files, 2 changesets, 2 total revisions ---- hg clone -r 5 test test-5 adding changesets adding manifests adding file changes added 3 changesets with 3 changes to 1 files updating to branch default 1 files updated, 0 files merged, 0 files removed, 0 files unresolved checking changesets checking manifests crosschecking files in changesets and manifests checking files 1 files, 3 changesets, 3 total revisions ---- hg clone -r 6 test test-6 adding changesets adding manifests adding file changes added 4 changesets with 5 changes to 2 files updating to branch default 2 files updated, 0 files merged, 0 files removed, 0 files unresolved checking changesets checking manifests crosschecking files in changesets and manifests checking files 2 files, 4 changesets, 5 total revisions ---- hg clone -r 7 test test-7 adding changesets adding manifests adding file changes added 5 changesets with 6 changes to 3 files updating to branch default 2 files updated, 0 files merged, 0 files removed, 0 files unresolved checking changesets checking manifests crosschecking files in changesets and manifests checking files 3 files, 5 changesets, 6 total revisions ---- hg clone -r 8 test test-8 adding changesets adding manifests adding file changes added 5 changesets with 5 changes to 2 files updating to branch default 1 files updated, 0 files merged, 0 files removed, 0 files unresolved checking changesets checking manifests crosschecking files in changesets and manifests checking files 2 files, 5 changesets, 5 total revisions $ cd test-8 $ hg pull ../test-7 pulling from ../test-7 searching for changes adding changesets adding manifests adding file changes added 4 changesets with 2 changes to 3 files (+1 heads) (run 'hg heads' to see heads, 'hg merge' to merge) $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files 4 files, 9 changesets, 7 total revisions $ cd ..