Previously, two changes that were nearly, but not quite, identical would result
in large merge conflict regions that looked very similar, and were thus very
confusing to users, and lead people used to other source control systems to
claim that "mercurial's merge algorithms suck". In the relatively common case
of a new file being introduced in two branches with very slight modifications,
the old behavior would show the entire file as a conflict, and it would be very
difficult for a user to determine what was going on.
In the past, mercurial attempted to solve this with a "very smart" algorithm
that would find all common lines, but this has significant problems as
described in 3d22d20aa950.
Instead, we use a "very dumb" algorithm introduced in the previous patch that
simply matches lines at the periphery of conflict regions. This minimizes most
conflict regions well, though there may still be some degenerate edge cases,
like small modification to the beginning and end of a large file.
The current output for a failed merge with conflict markers looks something like:
merging foo
warning: conflicts during merge.
merging foo incomplete! (edit conflicts, then use 'hg resolve --mark')
merging bar
warning: conflicts during merge.
merging bar incomplete! (edit conflicts, then use 'hg resolve --mark')
We're going to change the way merges are done to perform all premerges before
all merges, so that the output above would look like:
merging foo
merging bar
warning: conflicts during merge.
merging foo incomplete! (edit conflicts, then use 'hg resolve --mark')
warning: conflicts during merge.
merging bar incomplete! (edit conflicts, then use 'hg resolve --mark')
The 'warning: conflicts during merge' line has no context, so is pretty
confusing.
This patch will change the future output to:
merging foo
merging bar
warning: conflicts while merging foo! (edit, then use 'hg resolve --mark')
warning: conflicts while merging bar! (edit, then use 'hg resolve --mark')
The hint on how to resolve the conflicts makes this a bit unwieldy, but solving
that is tricky because we already hint that people run 'hg resolve' to retry
unresolved merges. The 'hg resolve --mark' mostly applies to conflict marker
based resolution.
The computation of roots was buggy, any ancestor of a bundled merge which was
also a descendant of the parents of a bundled revision were included as part of
the bundle. We fix it and add a test for strip (which revealed the problem).
Check the test for a practical usecase.
Previously we would only actually write the revbranchcache to disk if we were in
the middle of a write operation (like commit). Now we will also write it during
any read operation. The cache knows how to invalidate itself, so it shouldn't
become corrupt if multiple writers try at once (and the write-on-read
behavior/risk is the same as all our other caches).
The cache files are usually append only but will automatically be truncated and
recover in exceptional situations. Add a debug notice when such exceptional
situations are encountered.
Previously, a backup bundle could overwrite an existing bundle and cause user
data loss. For instance, if you have A<-B<-C and strip B, it produces backup
bundle B-backup.hg. If you then hg pull -r B B-backup.hg and strip it again, it
overwrites the existing B-backup.hg and C is lost.
The fix is to add a hash of all the nodes inside that bundle to the filename.
Fixed up existing tests and added a new test in test-strip.t
commitctx already showed notes with filenames but didn't provide any context.
It is just as relevant to know when manifest or changelog is committed.
So, in addition to filenames, also show headlines 'committing files:',
'committing manifest' and 'committing changelog'.
This patch makes bundrepo retract the phase boundary for new commits to 'draft'
status, which is consistent with the behavior of 'hg unbundle'. The old
behavior was for commits to appear with the same phase as their nearest
ancestor in the base repository.
This affects several classes of operation:
* Inspecting a bundle with the -B flag
* Treating a bundle file as a peer (old: everything public, new: everything draft)
* Incoming command (neither old or new behavior is sensible -- fixed in next patch)
When the progress extension is not enabled, each call to 'ui.progress' used to
issue a debug message. This results is a very verbose output and often redundant
in tests. Dropping it makes tests less volatile to factor they do not meant to
test.
We had to alter the sed trick in 'test-rename-merge2.t'. Sed is used to drop all
output from a certain point and hidding the progress output remove its anchor.
So we anchor on something else.
Show status messages while rebasing, similar to what graft do:
rebasing 12:2647734878ef "fork" (tip)
This gives more context for the user when resolving conflicts.
Globbing the hash made it harder to maintain tests with run-tests -i when it
was so far by the generated test output.
The hashes are stable and we just need to add a (glob).
Preparing for action list split-up, making sure the final change don't have any
test changes.
The patch moves debug statements around without really changing anything.
Arguably, it temporarily makes the code worse. The only justification is that
it makes it easier to review the test changes ... and in the end the big change
will not change test output at all.
The changes to test output are due to changes in the ordering of debug output.
That is mainly because we now do the debug logging for files when we actually
process them. Files are also processed in a slightly different but still
correct order. It is now primarily ordered by action type, secondarily by
filename.
The patch introduces some redundancy. Some of it will be removed again, some of
it will in the end help code readability and efficiency. It is possible that we
later on could introduce a "process this action list and do some logging and
progress reporting and apply this function".
The "preserving X for resolve" debug statements will only have single space
indentation. It will no longer have a leading single space indented "f: msg ->
m" message. Having this message double indented would thus no longer make
sense.
The bid actions will temporarily be sorted using a custom sort key that happens
to match the sort order the simplified code will have in the end.
The recently introduced message was:
no unresolved files; you may continue your unfinished operation
This had three problems:
- looks a bit like an error message because it's not saying "we've
just resolved the last file"
- refers to "unfinished operation", which won't be the case with
"update" or "merge"
- introduces semicolons to error messages, which is stylistically
questionable
I've simplified this to:
no more unresolved files
In the future, if we want to prompt someone to continue a particular operation, we should use
a hint style:
no more unresolved files
(use 'hg graft --continue' to finish grafting)
When using resolve, users often have to consult with the output of |hg
resolve -l| to see if any unresolved files remain. This step is tedious
and adds overhead to resolving.
This patch will notify a user if there are no unresolved files remaining
after executing |hg resolve|::
no unresolved files; you may continue your unfinished operation
The patch stops short of telling the user exactly what command should be
executed to continue the unfinished operation. That is because this
information is not currently captured anywhere. This would make a
compelling follow-up feature.
Prior this changeset, rebasing a merge whose first parent was not in
the rebase lead to wrong and highly conflicting merge. See the in-line
comment for details.
Test have been updated with the data provided by the reported.
When a rebase has conflicts and the user uses rebase --continue, the previously
active bookmark was not being made active once again. With this change that
bookmark is made active again, just as if the rebase had never been interrupted.
This changes the rebasestate file format, but should handle old formats correctly.
Since the file is transient, this is even less of a problem.
Adds a test to verify the new behavior. I manually tested continuing rebases
with and without an active bookmark, and with and without being on the bookmark
being rebased.
Many tests didn't change back from subdirectories at the end of the tests ...
and they don't have to. The missing 'cd ..' could always be added when another
test case is added to the test file.
This change do that tests (99.5%) consistently end up in $TESTDIR where they
started, thus making it simpler to extend them or move them around.