Mercurial > hg
view tests/test-origbackup-conflict.t @ 36672:9e7b14caf67f
xdiff: remove patience and histogram diff algorithms
Patience diff is the normal diff algorithm, plus some greediness that
unconditionally matches common common unique lines. That means it is easy to
construct cases to let it generate suboptimal result, like:
```
open('a', 'w').write('\n'.join(list('a' + 'x' * 300 + 'u' + 'x' * 700 + 'a\n')))
open('b', 'w').write('\n'.join(list('b' + 'x' * 700 + 'u' + 'x' * 300 + 'b\n')))
```
Patience diff has been advertised as being able to generate better results for
some C code changes. However, the more scientific way to do that is the
indention heuristic [1].
Since patience diff could generate suboptimal result more easily and its
"better" diff feature could be replaced by the new indention heuristic, let's
just remove it and its variant histogram diff to simplify the code.
[1]: https://github.com/git/git/commit/433860f3d0beb0c6f205290bd16cda413148f098
Test Plan:
`gcc -fPIC *.c --shared -o xdiff.so` still builds.
Differential Revision: https://phab.mercurial-scm.org/D2573
author | Jun Wu <quark@fb.com> |
---|---|
date | Sat, 03 Mar 2018 10:39:55 -0800 |
parents | 4441705b7111 |
children | 0b46e1aa7760 |
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Set up repo $ cat << EOF >> $HGRCPATH > [ui] > origbackuppath=.hg/origbackups > [merge] > checkunknown=warn > EOF $ hg init repo $ cd repo $ echo base > base $ hg add base $ hg commit -m "base" Make a dir named b that contains a file, and a file named d $ mkdir -p b $ echo c1 > b/c $ echo d1 > d $ hg add b/c d $ hg commit -m "c1" $ hg bookmark c1 Peform an update that causes b/c to be backed up $ hg up -q 0 $ mkdir -p b $ echo c2 > b/c $ hg up --verbose c1 resolving manifests b/c: replacing untracked file getting b/c creating directory: $TESTTMP/repo/.hg/origbackups/b getting d 2 files updated, 0 files merged, 0 files removed, 0 files unresolved (activating bookmark c1) $ test -f .hg/origbackups/b/c Make files named b and d $ hg up -q 0 $ echo b1 > b $ echo d2 > d $ hg add b d $ hg commit -m b1 created new head $ hg bookmark b1 Perform an update that causes b to be backed up - it should replace the backup b dir $ hg up -q 0 $ echo b2 > b $ hg up --verbose b1 resolving manifests b: replacing untracked file getting b removing conflicting directory: $TESTTMP/repo/.hg/origbackups/b getting d 2 files updated, 0 files merged, 0 files removed, 0 files unresolved (activating bookmark b1) $ test -f .hg/origbackups/b Perform an update the causes b/c to be backed up again - it should replace the backup b file $ hg up -q 0 $ mkdir b $ echo c3 > b/c $ hg up --verbose c1 resolving manifests b/c: replacing untracked file getting b/c creating directory: $TESTTMP/repo/.hg/origbackups/b removing conflicting file: $TESTTMP/repo/.hg/origbackups/b getting d 2 files updated, 0 files merged, 0 files removed, 0 files unresolved (activating bookmark c1) $ test -d .hg/origbackups/b Cause two symlinks to be backed up that points to a valid location from the backup dir $ hg up -q 0 $ mkdir ../sym-link-target #if symlink $ ln -s ../../../sym-link-target b $ ln -s ../../../sym-link-target d #else $ touch b d #endif $ hg up b1 b: replacing untracked file d: replacing untracked file 2 files updated, 0 files merged, 0 files removed, 0 files unresolved (activating bookmark b1) #if symlink $ readlink.py .hg/origbackups/b .hg/origbackups/b -> ../../../sym-link-target #endif Perform an update that causes b/c and d to be backed up again - b/c should not go into the target dir $ hg up -q 0 $ mkdir b $ echo c4 > b/c $ echo d3 > d $ hg up --verbose c1 resolving manifests b/c: replacing untracked file d: replacing untracked file getting b/c creating directory: $TESTTMP/repo/.hg/origbackups/b removing conflicting file: $TESTTMP/repo/.hg/origbackups/b getting d 2 files updated, 0 files merged, 0 files removed, 0 files unresolved (activating bookmark c1) $ cat .hg/origbackups/b/c c4 $ cat .hg/origbackups/d d3 $ ls ../sym-link-target Incorrectly configure origbackuppath to be under a file $ echo data > .hg/badorigbackups $ hg up -q 0 $ mkdir b $ echo c5 > b/c $ hg up --verbose c1 --config ui.origbackuppath=.hg/badorigbackups resolving manifests b/c: replacing untracked file getting b/c creating directory: $TESTTMP/repo/.hg/badorigbackups/b abort: $ENOTDIR$: '$TESTTMP/repo/.hg/badorigbackups/b' [255] $ cat .hg/badorigbackups data