filemerge: add support for partial conflict resolution by external tool
A common class of merge conflicts is in imports/#includes/etc. It's
relatively easy to write a tool that can resolve these conflicts,
perhaps by naively just unioning the statements and leaving any
cleanup to other tools to do later [1]. Such specialized tools cannot
generally resolve all conflicts in a file, of course. Let's therefore
call them "partial merge tools". Note that the internal simplemerge
algorithm is such a partial merge tool - one that only resolves
trivial "conflicts" where one side is unchanged or both sides change
in the same way.
One can also imagine having smarter language-aware partial tools that
merge the AST. It may be useful for such tools to interactively let
the user resolve any conflicts it can't resolve itself. However,
having the option of implementing it as a partial merge tool means
that the developer doesn't *need* to create a UI for it. Instead, the
user can resolve any remaining conflicts with their regular merge tool
(e.g. `:merge3` or `meld).
We don't currently have a way to let the user define such partial
merge tools. That's what this patch addresses. It lets the user
configure partial merge tools to run. Each tool can be configured to
run only on files matching certain patterns (e.g. "*.py"). The tool
takes three inputs (local, base, other) and resolves conflicts by
updating these in place. For example, let's say the inputs are these:
base:
```
import sys
def main():
print('Hello')
```
local:
```
import os
import sys
def main():
print('Hi')
```
other:
```
import re
import sys
def main():
print('Howdy')
```
A partial merge tool could now resolve the conflicting imports by
replacing the import statements in *all* files by the following
snippet, while leaving the remainder of the files unchanged.
```
import os
import re
import sys
```
As a result, simplemerge and any regular merge tool that runs after
the partial merge tool(s) will consider the imports to be
non-conflicting and will only present the conflict in `main()` to the
user.
Differential Revision: https://phab.mercurial-scm.org/D12356
This file contains tests case that deal with format change accross stream clone
#require serve no-reposimplestore no-chg
#testcases stream-legacy stream-bundle2
$ cat << EOF >> $HGRCPATH
> [storage]
> revlog.persistent-nodemap.slow-path=allow
> EOF
#if stream-legacy
$ cat << EOF >> $HGRCPATH
> [server]
> bundle2.stream = no
> EOF
#endif
Initialize repository
$ hg init server --config format.use-share-safe=yes --config format.use-persistent-nodemap=yes
$ cd server
$ sh $TESTDIR/testlib/stream_clone_setup.sh
adding 00changelog-ab349180a0405010.nd
adding 00changelog.d
adding 00changelog.i
adding 00changelog.n
adding 00manifest.d
adding 00manifest.i
adding container/isam-build-centos7/bazel-coverage-generator-sandboxfs-compatibility-0758e3e4f6057904d44399bd666faba9e7f40686.patch
adding data/foo.d
adding data/foo.i
adding data/foo.n
adding data/undo.babar
adding data/undo.d
adding data/undo.foo.d
adding data/undo.foo.i
adding data/undo.foo.n
adding data/undo.i
adding data/undo.n
adding data/undo.py
adding foo.d
adding foo.i
adding foo.n
adding meta/foo.d
adding meta/foo.i
adding meta/foo.n
adding meta/undo.babar
adding meta/undo.d
adding meta/undo.foo.d
adding meta/undo.foo.i
adding meta/undo.foo.n
adding meta/undo.i
adding meta/undo.n
adding meta/undo.py
adding savanah/foo.d
adding savanah/foo.i
adding savanah/foo.n
adding savanah/undo.babar
adding savanah/undo.d
adding savanah/undo.foo.d
adding savanah/undo.foo.i
adding savanah/undo.foo.n
adding savanah/undo.i
adding savanah/undo.n
adding savanah/undo.py
adding store/C\xc3\xa9lesteVille_is_a_Capital_City (esc)
adding store/foo.d
adding store/foo.i
adding store/foo.n
adding store/undo.babar
adding store/undo.d
adding store/undo.foo.d
adding store/undo.foo.i
adding store/undo.foo.n
adding store/undo.i
adding store/undo.n
adding store/undo.py
adding undo.babar
adding undo.d
adding undo.foo.d
adding undo.foo.i
adding undo.foo.n
adding undo.i
adding undo.n
adding undo.py
$ hg debugbuilddag .+5000 --from-existing
$ ls -1 .hg/store/00changelog*
.hg/store/00changelog-*.nd (glob)
.hg/store/00changelog.d
.hg/store/00changelog.i
.hg/store/00changelog.n
$ cd ..
#if no-windows
Test streaming from/to repository without a store:
==================================================
This is skipped Windows needs dot-encode to handle some of the file in this
tests, and dot-encode need the store enabled.
$ hg clone --pull --config format.usestore=no server server-no-store
requesting all changes
adding changesets
adding manifests
adding file changes
added 5004 changesets with 1088 changes to 1088 files (+1 heads)
new changesets 96ee1d7354c4:06ddac466af5
updating to branch default
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg verify -R server-no-store
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
checked 5004 changesets with 1088 changes to 1088 files
$ hg -R server serve -p $HGPORT -d --pid-file=hg-1.pid --error errors-1.txt
$ cat hg-1.pid > $DAEMON_PIDS
$ hg -R server-no-store serve -p $HGPORT2 -d --pid-file=hg-2.pid --error errors-2.txt
$ cat hg-2.pid >> $DAEMON_PIDS
$ hg debugrequires -R server | grep store
store
$ hg debugrequires -R server-no-store | grep store
[1]
store → no-store cloning
$ hg clone --quiet --stream -U http://localhost:$HGPORT clone-remove-store --config format.usestore=no
$ cat errors-1.txt
$ hg -R clone-remove-store verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
checked 5004 changesets with 1088 changes to 1088 files
$ hg debugrequires -R clone-remove-store | grep store
[1]
no-store → store cloning
$ hg clone --quiet --stream -U http://localhost:$HGPORT2 clone-add-store --config format.usestore=yes
$ cat errors-2.txt
$ hg -R clone-add-store verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
checked 5004 changesets with 1088 changes to 1088 files
$ hg debugrequires -R clone-add-store | grep store
store
$ killdaemons.py
$ rm hg-*.pid errors-*.txt
#endif
Test streaming from/to repository without a fncache
===================================================
$ hg clone --pull --config format.usefncache=no server server-no-fncache
requesting all changes
adding changesets
adding manifests
adding file changes
added 5004 changesets with 1088 changes to 1088 files (+1 heads)
new changesets 96ee1d7354c4:06ddac466af5
updating to branch default
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg verify -R server-no-fncache
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
checked 5004 changesets with 1088 changes to 1088 files
$ hg -R server serve -p $HGPORT -d --pid-file=hg-1.pid --error errors-1.txt
$ cat hg-1.pid > $DAEMON_PIDS
$ hg -R server-no-fncache serve -p $HGPORT2 -d --pid-file=hg-2.pid --error errors-2.txt
$ cat hg-2.pid >> $DAEMON_PIDS
$ hg debugrequires -R server | grep fncache
fncache
$ hg debugrequires -R server-no-fncache | grep fncache
[1]
fncache → no-fncache cloning
$ hg clone --quiet --stream -U http://localhost:$HGPORT clone-remove-fncache --config format.usefncache=no
$ cat errors-1.txt
$ hg -R clone-remove-fncache verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
checked 5004 changesets with 1088 changes to 1088 files
$ hg debugrequires -R clone-remove-fncache | grep fncache
[1]
no-fncache → fncache cloning
$ hg clone --quiet --stream -U http://localhost:$HGPORT2 clone-add-fncache --config format.usefncache=yes
$ cat errors-2.txt
$ hg -R clone-add-fncache verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
checked 5004 changesets with 1088 changes to 1088 files
$ hg debugrequires -R clone-add-fncache | grep fncache
fncache
$ killdaemons.py
Test streaming from/to repository without a dotencode
===================================================
$ rm hg-*.pid errors-*.txt
$ hg clone --pull --config format.dotencode=no server server-no-dotencode
requesting all changes
adding changesets
adding manifests
adding file changes
added 5004 changesets with 1088 changes to 1088 files (+1 heads)
new changesets 96ee1d7354c4:06ddac466af5
updating to branch default
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg verify -R server-no-dotencode
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
checked 5004 changesets with 1088 changes to 1088 files
$ hg -R server serve -p $HGPORT -d --pid-file=hg-1.pid --error errors-1.txt
$ cat hg-1.pid > $DAEMON_PIDS
$ hg -R server-no-dotencode serve -p $HGPORT2 -d --pid-file=hg-2.pid --error errors-2.txt
$ cat hg-2.pid >> $DAEMON_PIDS
$ hg debugrequires -R server | grep dotencode
dotencode
$ hg debugrequires -R server-no-dotencode | grep dotencode
[1]
dotencode → no-dotencode cloning
$ hg clone --quiet --stream -U http://localhost:$HGPORT clone-remove-dotencode --config format.dotencode=no
$ cat errors-1.txt
$ hg -R clone-remove-dotencode verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
checked 5004 changesets with 1088 changes to 1088 files
$ hg debugrequires -R clone-remove-dotencode | grep dotencode
[1]
no-dotencode → dotencode cloning
$ hg clone --quiet --stream -U http://localhost:$HGPORT2 clone-add-dotencode --config format.dotencode=yes
$ cat errors-2.txt
$ hg -R clone-add-dotencode verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
checked 5004 changesets with 1088 changes to 1088 files
$ hg debugrequires -R clone-add-dotencode | grep dotencode
dotencode
$ killdaemons.py
Cloning from a share
--------------------
We should be able to clone from a "share" repository, it will use the source store for streaming.
The resulting clone should not use share.
$ rm hg-*.pid errors-*.txt
$ hg share --config extensions.share= server server-share -U
$ hg -R server-share serve -p $HGPORT -d --pid-file=hg-1.pid --error errors-1.txt
$ cat hg-1.pid > $DAEMON_PIDS
$ hg clone --quiet --stream -U http://localhost:$HGPORT clone-from-share
$ hg -R clone-from-share verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
checked 5004 changesets with 1088 changes to 1088 files
$ hg debugrequires -R clone-from-share | egrep 'share$'
[1]
$ killdaemons.py
Test streaming from/to repository without a share-safe
======================================================
$ rm hg-*.pid errors-*.txt
$ hg clone --pull --config format.use-share-safe=no server server-no-share-safe
requesting all changes
adding changesets
adding manifests
adding file changes
added 5004 changesets with 1088 changes to 1088 files (+1 heads)
new changesets 96ee1d7354c4:06ddac466af5
updating to branch default
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg verify -R server-no-share-safe
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
checked 5004 changesets with 1088 changes to 1088 files
$ hg -R server serve -p $HGPORT -d --pid-file=hg-1.pid --error errors-1.txt
$ cat hg-1.pid > $DAEMON_PIDS
$ hg -R server-no-share-safe serve -p $HGPORT2 -d --pid-file=hg-2.pid --error errors-2.txt
$ cat hg-2.pid >> $DAEMON_PIDS
$ hg debugrequires -R server | grep share-safe
share-safe
$ hg debugrequires -R server-no-share-safe | grep share-safe
[1]
share-safe → no-share-safe cloning
$ hg clone --quiet --stream -U http://localhost:$HGPORT clone-remove-share-safe --config format.use-share-safe=no
$ cat errors-1.txt
$ hg -R clone-remove-share-safe verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
checked 5004 changesets with 1088 changes to 1088 files
$ hg debugrequires -R clone-remove-share-safe | grep share-safe
[1]
no-share-safe → share-safe cloning
$ hg clone --quiet --stream -U http://localhost:$HGPORT2 clone-add-share-safe --config format.use-share-safe=yes
$ cat errors-2.txt
$ hg -R clone-add-share-safe verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
checked 5004 changesets with 1088 changes to 1088 files
$ hg debugrequires -R clone-add-share-safe | grep share-safe
share-safe
$ killdaemons.py
Test streaming from/to repository without a persistent-nodemap
==============================================================
persistent nodemap affects revlog, but they are easy to generate locally, so we allow it to be changed over a stream clone
$ rm hg-*.pid errors-*.txt
$ hg clone --pull --config format.use-persistent-nodemap=no server server-no-persistent-nodemap
requesting all changes
adding changesets
adding manifests
adding file changes
added 5004 changesets with 1088 changes to 1088 files (+1 heads)
new changesets 96ee1d7354c4:06ddac466af5
updating to branch default
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg verify -R server-no-persistent-nodemap
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
checked 5004 changesets with 1088 changes to 1088 files
$ hg -R server serve -p $HGPORT -d --pid-file=hg-1.pid --error errors-1.txt
$ cat hg-1.pid > $DAEMON_PIDS
$ hg -R server-no-persistent-nodemap serve -p $HGPORT2 -d --pid-file=hg-2.pid --error errors-2.txt
$ cat hg-2.pid >> $DAEMON_PIDS
$ hg debugrequires -R server | grep persistent-nodemap
persistent-nodemap
$ hg debugrequires -R server-no-persistent-nodemap | grep persistent-nodemap
[1]
$ ls -1 server/.hg/store/00changelog*
server/.hg/store/00changelog-*.nd (glob)
server/.hg/store/00changelog.d
server/.hg/store/00changelog.i
server/.hg/store/00changelog.n
$ ls -1 server-no-persistent-nodemap/.hg/store/00changelog*
server-no-persistent-nodemap/.hg/store/00changelog.d
server-no-persistent-nodemap/.hg/store/00changelog.i
persistent-nodemap → no-persistent-nodemap cloning
$ hg clone --quiet --stream -U http://localhost:$HGPORT clone-remove-persistent-nodemap --config format.use-persistent-nodemap=no
$ cat errors-1.txt
$ hg -R clone-remove-persistent-nodemap verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
checked 5004 changesets with 1088 changes to 1088 files
$ hg debugrequires -R clone-remove-persistent-nodemap | grep persistent-nodemap
[1]
The persistent-nodemap files should no longer exists
$ ls -1 clone-remove-persistent-nodemap/.hg/store/00changelog*
clone-remove-persistent-nodemap/.hg/store/00changelog.d
clone-remove-persistent-nodemap/.hg/store/00changelog.i
no-persistent-nodemap → persistent-nodemap cloning
$ hg clone --quiet --stream -U http://localhost:$HGPORT2 clone-add-persistent-nodemap --config format.use-persistent-nodemap=yes
$ cat errors-2.txt
$ hg -R clone-add-persistent-nodemap verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
checked 5004 changesets with 1088 changes to 1088 files
$ hg debugrequires -R clone-add-persistent-nodemap | grep persistent-nodemap
persistent-nodemap
The persistent-nodemap files should exists
$ ls -1 clone-add-persistent-nodemap/.hg/store/00changelog*
clone-add-persistent-nodemap/.hg/store/00changelog-*.nd (glob)
clone-add-persistent-nodemap/.hg/store/00changelog.d
clone-add-persistent-nodemap/.hg/store/00changelog.i
clone-add-persistent-nodemap/.hg/store/00changelog.n
$ killdaemons.py