From: Elijah Newren <newren@gmail.com>
To: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Cc: Git Mailing List <git@vger.kernel.org>,
Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH 03/19] Ensure index matches head before invoking merge machinery, round N
Date: Thu, 25 Jul 2019 12:58:35 -0700 [thread overview]
Message-ID: <CABPp-BHahUojy1+cBrOTCvg-w3n-xJp3yE3Br6v8jMwnMzQwCQ@mail.gmail.com> (raw)
In-Reply-To: <nycvar.QRO.7.76.6.1907252120300.21907@tvgsbejvaqbjf.bet>
Hi Dscho,
On Thu, Jul 25, 2019 at 12:41 PM Johannes Schindelin
<Johannes.Schindelin@gmx.de> wrote:
>
> Hi Elijah,
>
> On Thu, 25 Jul 2019, Elijah Newren wrote:
>
<snip>
> > ...And it was fixed again in commit
> > 160252f81626 ("git-merge-ours: make sure our index matches HEAD", 2005-11-03)
> > ...and it was fixed again in commit
> > 3ec62ad9ffba ("merge-octopus: abort if index does not match HEAD", 2016-04-09)
> > ...and again in commit
> > 65170c07d466 ("merge-recursive: avoid incorporating uncommitted changes in a merge", 2017-12-21)
> > ...and again in commit
> > eddd1a411d93 ("merge-recursive: enforce rule that index matches head before merging", 2018-06-30)
> >
> > ...with multiple testcases added to the testsuite that could be
> > enumerated in even more commits.
> >
> > Then, finally, in a patch in the same series as the last fix above, the
> > documentation about this requirement was fixed in commit 55f39cf7551b
> > ("merge: fix misleading pre-merge check documentation", 2018-06-30), and
> > we all lived happily ever after...
> >
> > </quick summary>
>
> Whoa. What a story.
I know, right?
> > diff --git a/builtin/merge-recursive.c b/builtin/merge-recursive.c
> > index 5b910e351e..a4bfd8fc51 100644
> > --- a/builtin/merge-recursive.c
> > +++ b/builtin/merge-recursive.c
> > @@ -1,3 +1,4 @@
> > +#include "cache.h"
> > #include "builtin.h"
> > #include "commit.h"
> > #include "tag.h"
> > @@ -63,6 +64,9 @@ int cmd_merge_recursive(int argc, const char **argv, const char *prefix)
> > if (argc - i != 3) /* "--" "<head>" "<remote>" */
> > die(_("not handling anything other than two heads merge."));
> >
> > + if (repo_read_index_unmerged(the_repository))
> > + die_resolve_conflict("merge");
>
> For a moment I was unsure whether `_unmerged()` is the right thing to do
> here, as it specifically allows to read the index even when there are
> conflict stages. But I guess it does not matter too much here. I
> probably would have opted for `repo_read_index()` instead, though.
The names repo_read_index() and repo_read_index_unmerged() actually
seem slightly misleading to me; they seem to do the opposite of what
you'd think they do.
repo_read_index() reads in an index and allows unmerged entries and
returns istate->cache_nr.
repo_read_index_unmerged() calls repo_read_index(), then checks to see
if any of the entries are unmerged and returns whether or not any
unmerged entries were found.
So, the way to disallow conflict stages isn't to use
repo_read_index(), but to use repo_read_index_unmerged(), as I did.
Counter-intuitive, I know.
<snip>
> But of course, if there are uncommitted changes, this would write a tree
> different from HEAD, then reset the index to match HEAD, so indeed, this
> discard/read dance is necessary.
>
> So this hunk is good.
>
<snip>
>
> This is obviously a good change: it strengthens the test case by fixing
> a subtle bug.
>
> Thanks,
> Dscho
Thanks for taking a look!
next prev parent reply other threads:[~2019-07-25 19:58 UTC|newest]
Thread overview: 157+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-25 17:45 [PATCH 00/19] Cleanup merge API Elijah Newren
2019-07-25 17:45 ` [PATCH 01/19] merge-recursive: fix minor memory leak in error condition Elijah Newren
2019-07-25 17:45 ` [PATCH 02/19] merge-recursive: remove another implicit dependency on the_repository Elijah Newren
2019-07-25 17:45 ` [PATCH 03/19] Ensure index matches head before invoking merge machinery, round N Elijah Newren
2019-07-25 19:41 ` Johannes Schindelin
2019-07-25 19:58 ` Elijah Newren [this message]
2019-07-26 11:23 ` Johannes Schindelin
2019-07-25 17:45 ` [PATCH 04/19] merge-recursive: exit early if index != head Elijah Newren
2019-07-25 19:51 ` Johannes Schindelin
2019-07-25 20:12 ` Elijah Newren
2019-07-25 17:45 ` [PATCH 05/19] merge-recursive: don't force external callers to do our logging Elijah Newren
2019-07-25 17:45 ` [PATCH 06/19] Change call signature of write_tree_from_memory() Elijah Newren
2019-07-25 19:55 ` Johannes Schindelin
2019-07-26 4:58 ` Elijah Newren
2019-07-25 17:45 ` [PATCH 07/19] Move write_tree_from_memory() from merge-recursive to cache-tree Elijah Newren
2019-07-25 17:46 ` [PATCH 08/19] merge-recursive: fix some overly long lines Elijah Newren
2019-07-25 17:46 ` [PATCH 09/19] merge-recursive: use common name for ancestors/common/base_list Elijah Newren
2019-07-25 17:46 ` [PATCH 10/19] merge-recursive: rename 'mrtree' to 'result_tree', for clarity Elijah Newren
2019-07-25 20:02 ` Johannes Schindelin
2019-07-25 17:46 ` [PATCH 11/19] merge-recursive: rename merge_options argument to opt in header Elijah Newren
2019-07-25 17:46 ` [PATCH 12/19] merge-recursive: move some definitions around to clean up the header Elijah Newren
2019-07-25 17:46 ` [PATCH 13/19] merge-recursive: consolidate unnecessary fields in merge_options Elijah Newren
2019-07-25 17:46 ` [PATCH 14/19] merge-recursive: comment and reorder the merge_options fields Elijah Newren
2019-07-25 17:46 ` [PATCH 15/19] merge-recursive: split internal fields into a separate struct Elijah Newren
2019-07-25 20:12 ` Johannes Schindelin
2019-07-25 20:27 ` Elijah Newren
2019-07-26 11:25 ` Johannes Schindelin
2019-07-26 15:30 ` Elijah Newren
2019-07-25 17:46 ` [PATCH 16/19] merge-recursive: alphabetize include list Elijah Newren
2019-07-25 17:46 ` [PATCH 17/19] merge-recursive: rename MERGE_RECURSIVE_* to MERGE_VARIANT_* Elijah Newren
2019-07-25 17:46 ` [PATCH 18/19] merge-recursive: be consistent with assert Elijah Newren
2019-07-25 17:46 ` [PATCH 19/19] merge-recursive: provide a better label for diff3 common ancestor Elijah Newren
2019-07-25 20:28 ` Johannes Schindelin
2019-07-25 18:12 ` [PATCH 00/19] Cleanup merge API Junio C Hamano
2019-07-25 19:06 ` Elijah Newren
2019-07-25 22:50 ` Junio C Hamano
2019-07-26 14:07 ` Johannes Schindelin
2019-07-25 19:15 ` Johannes Schindelin
2019-07-26 15:15 ` Elijah Newren
2019-07-26 15:52 ` [PATCH v2 00/20] " Elijah Newren
2019-07-26 15:52 ` [PATCH v2 01/20] merge-recursive: fix minor memory leak in error condition Elijah Newren
2019-07-26 18:31 ` Junio C Hamano
2019-07-26 23:19 ` Elijah Newren
2019-07-29 14:13 ` Derrick Stolee
2019-07-26 15:52 ` [PATCH v2 02/20] merge-recursive: remove another implicit dependency on the_repository Elijah Newren
2019-07-26 18:42 ` Junio C Hamano
2019-07-26 15:52 ` [PATCH v2 03/20] Ensure index matches head before invoking merge machinery, round N Elijah Newren
2019-07-26 19:14 ` Junio C Hamano
2019-07-26 23:22 ` Elijah Newren
2019-07-26 15:52 ` [PATCH v2 04/20] merge-recursive: exit early if index != head Elijah Newren
2019-07-26 19:32 ` Junio C Hamano
2019-07-26 23:26 ` Elijah Newren
2019-07-29 15:56 ` Junio C Hamano
2019-07-26 15:52 ` [PATCH v2 05/20] merge-recursive: remove useless parameter in merge_trees() Elijah Newren
2019-07-26 19:37 ` Junio C Hamano
2019-07-26 15:52 ` [PATCH v2 06/20] merge-recursive: don't force external callers to do our logging Elijah Newren
2019-07-26 19:57 ` Junio C Hamano
2019-07-26 23:28 ` Elijah Newren
2019-07-26 15:52 ` [PATCH v2 07/20] Use write_index_as_tree() in lieu of write_tree_from_memory() Elijah Newren
2019-07-26 20:11 ` Junio C Hamano
2019-07-26 23:39 ` Elijah Newren
2019-07-29 4:46 ` Junio C Hamano
2019-07-26 15:52 ` [PATCH v2 08/20] merge-recursive: fix some overly long lines Elijah Newren
2019-07-26 15:52 ` [PATCH v2 09/20] merge-recursive: use common name for ancestors/common/base_list Elijah Newren
2019-07-26 15:52 ` [PATCH v2 10/20] merge-recursive: rename 'mrtree' to 'result_tree', for clarity Elijah Newren
2019-07-26 15:52 ` [PATCH v2 11/20] merge-recursive: rename merge_options argument to opt in header Elijah Newren
2019-07-26 15:52 ` [PATCH v2 12/20] merge-recursive: move some definitions around to clean up the header Elijah Newren
2019-07-26 15:52 ` [PATCH v2 13/20] merge-recursive: consolidate unnecessary fields in merge_options Elijah Newren
2019-07-26 15:52 ` [PATCH v2 14/20] merge-recursive: comment and reorder the merge_options fields Elijah Newren
2019-07-26 15:52 ` [PATCH v2 15/20] merge-recursive: avoid losing output and leaking memory holding that output Elijah Newren
2019-07-26 15:52 ` [PATCH v2 16/20] merge-recursive: split internal fields into a separate struct Elijah Newren
2019-07-26 15:52 ` [PATCH v2 17/20] merge-recursive: alphabetize include list Elijah Newren
2019-07-26 15:52 ` [PATCH v2 18/20] merge-recursive: rename MERGE_RECURSIVE_* to MERGE_VARIANT_* Elijah Newren
2019-07-26 15:52 ` [PATCH v2 19/20] merge-recursive: be consistent with assert Elijah Newren
2019-07-26 15:52 ` [PATCH v2 20/20] merge-recursive: provide a better label for diff3 common ancestor Elijah Newren
2019-08-15 21:40 ` [PATCH v3 00/24] Clean up merge API Elijah Newren
2019-08-15 21:40 ` [PATCH v3 01/24] merge-recursive: be consistent with assert Elijah Newren
2019-08-15 21:40 ` [PATCH v3 02/24] checkout: provide better conflict hunk description with detached HEAD Elijah Newren
2019-08-15 21:40 ` [PATCH v3 03/24] merge-recursive: enforce opt->ancestor != NULL when calling merge_trees() Elijah Newren
2019-08-16 21:05 ` Junio C Hamano
2019-08-15 21:40 ` [PATCH v3 04/24] merge-recursive: provide a better label for diff3 common ancestor Elijah Newren
2019-08-16 21:33 ` Junio C Hamano
2019-08-16 22:39 ` Elijah Newren
2019-08-15 21:40 ` [PATCH v3 05/24] merge-recursive: introduce an enum for detect_directory_renames values Elijah Newren
2019-08-15 21:40 ` [PATCH v3 06/24] merge-recursive: future-proof update_file_flags() against memory leaks Elijah Newren
2019-08-15 21:40 ` [PATCH v3 07/24] merge-recursive: remove another implicit dependency on the_repository Elijah Newren
2019-08-15 21:40 ` [PATCH v3 08/24] Ensure index matches head before invoking merge machinery, round N Elijah Newren
2019-08-15 21:40 ` [PATCH v3 09/24] merge-recursive: exit early if index != head Elijah Newren
2019-08-15 21:40 ` [PATCH v3 10/24] merge-recursive: remove useless parameter in merge_trees() Elijah Newren
2019-08-15 21:40 ` [PATCH v3 11/24] merge-recursive: don't force external callers to do our logging Elijah Newren
2019-08-15 21:40 ` [PATCH v3 12/24] cache-tree: share code between functions writing an index as a tree Elijah Newren
2019-08-16 22:01 ` Junio C Hamano
2019-08-16 22:39 ` Elijah Newren
2019-08-15 21:40 ` [PATCH v3 13/24] merge-recursive: fix some overly long lines Elijah Newren
2019-08-15 21:40 ` [PATCH v3 14/24] merge-recursive: use common name for ancestors/common/base_list Elijah Newren
2019-08-15 21:40 ` [PATCH v3 15/24] merge-recursive: rename 'mrtree' to 'result_tree', for clarity Elijah Newren
2019-08-15 21:40 ` [PATCH v3 16/24] merge-recursive: rename merge_options argument to opt in header Elijah Newren
2019-08-15 21:40 ` [PATCH v3 17/24] merge-recursive: move some definitions around to clean up the header Elijah Newren
2019-08-15 21:40 ` [PATCH v3 18/24] merge-recursive: consolidate unnecessary fields in merge_options Elijah Newren
2019-08-16 22:14 ` Junio C Hamano
2019-08-16 22:59 ` Elijah Newren
2019-08-16 23:24 ` Junio C Hamano
2019-08-15 21:40 ` [PATCH v3 19/24] merge-recursive: comment and reorder the merge_options fields Elijah Newren
2019-08-15 21:40 ` [PATCH v3 20/24] merge-recursive: avoid losing output and leaking memory holding that output Elijah Newren
2019-08-15 21:40 ` [PATCH v3 21/24] merge-recursive: split internal fields into a separate struct Elijah Newren
2019-08-16 21:19 ` SZEDER Gábor
2019-08-16 23:00 ` Elijah Newren
2019-08-16 22:17 ` Junio C Hamano
2019-08-15 21:40 ` [PATCH v3 22/24] merge-recursive: rename MERGE_RECURSIVE_* to MERGE_VARIANT_* Elijah Newren
2019-08-15 21:40 ` [PATCH v3 23/24] merge-recursive: add sanity checks for relevant merge_options Elijah Newren
2019-08-16 19:52 ` Junio C Hamano
2019-08-16 22:08 ` Elijah Newren
2019-08-16 23:15 ` Junio C Hamano
2019-08-16 19:59 ` Junio C Hamano
2019-08-16 22:09 ` Elijah Newren
2019-08-15 21:40 ` [PATCH v3 24/24] merge-recursive: alphabetize include list Elijah Newren
2019-08-17 18:41 ` [PATCH v4 00/24] Clean up merge API Elijah Newren
2019-08-17 18:41 ` [PATCH v4 01/24] merge-recursive: be consistent with assert Elijah Newren
2019-08-17 18:41 ` [PATCH v4 02/24] checkout: provide better conflict hunk description with detached HEAD Elijah Newren
2019-08-17 18:41 ` [PATCH v4 03/24] merge-recursive: enforce opt->ancestor != NULL when calling merge_trees() Elijah Newren
2019-08-17 18:41 ` [PATCH v4 04/24] merge-recursive: provide a better label for diff3 common ancestor Elijah Newren
2019-09-30 21:14 ` Jeff King
2019-09-30 21:19 ` Jeff King
2019-09-30 22:54 ` [PATCH] merge-recursive: fix the diff3 common ancestor label for virtual commits Elijah Newren
2019-10-01 6:56 ` Elijah Newren
2019-10-01 6:58 ` [PATCH v2] " Elijah Newren
2019-10-01 14:49 ` Jeff King
2019-10-01 18:17 ` [PATCH v3] " Elijah Newren
2019-10-07 2:51 ` Junio C Hamano
2019-10-07 15:52 ` [PATCH] merge-recursive: fix the fix to the diff3 common ancestor label Elijah Newren
2019-10-08 2:32 ` Junio C Hamano
2019-10-08 2:36 ` Junio C Hamano
2019-10-08 16:16 ` Elijah Newren
2019-08-17 18:41 ` [PATCH v4 05/24] merge-recursive: introduce an enum for detect_directory_renames values Elijah Newren
2019-08-17 18:41 ` [PATCH v4 06/24] merge-recursive: future-proof update_file_flags() against memory leaks Elijah Newren
2019-08-17 18:41 ` [PATCH v4 07/24] merge-recursive: remove another implicit dependency on the_repository Elijah Newren
2019-08-17 18:41 ` [PATCH v4 08/24] Ensure index matches head before invoking merge machinery, round N Elijah Newren
2019-09-02 23:01 ` Johannes Schindelin
2019-09-03 13:34 ` Johannes Schindelin
2019-09-03 18:17 ` Elijah Newren
2019-08-17 18:41 ` [PATCH v4 09/24] merge-recursive: exit early if index != head Elijah Newren
2019-08-17 18:41 ` [PATCH v4 10/24] merge-recursive: remove useless parameter in merge_trees() Elijah Newren
2019-08-17 18:41 ` [PATCH v4 11/24] merge-recursive: don't force external callers to do our logging Elijah Newren
2019-08-17 18:41 ` [PATCH v4 12/24] cache-tree: share code between functions writing an index as a tree Elijah Newren
2019-08-17 18:41 ` [PATCH v4 13/24] merge-recursive: fix some overly long lines Elijah Newren
2019-08-17 18:41 ` [PATCH v4 14/24] merge-recursive: use common name for ancestors/common/base_list Elijah Newren
2019-08-17 18:41 ` [PATCH v4 15/24] merge-recursive: rename 'mrtree' to 'result_tree', for clarity Elijah Newren
2019-08-17 18:41 ` [PATCH v4 16/24] merge-recursive: rename merge_options argument to opt in header Elijah Newren
2019-08-17 18:41 ` [PATCH v4 17/24] merge-recursive: move some definitions around to clean up the header Elijah Newren
2019-08-17 18:41 ` [PATCH v4 18/24] merge-recursive: consolidate unnecessary fields in merge_options Elijah Newren
2019-08-17 18:41 ` [PATCH v4 19/24] merge-recursive: comment and reorder the merge_options fields Elijah Newren
2019-08-17 18:41 ` [PATCH v4 20/24] merge-recursive: avoid losing output and leaking memory holding that output Elijah Newren
2019-08-17 18:41 ` [PATCH v4 21/24] merge-recursive: split internal fields into a separate struct Elijah Newren
2019-08-19 17:17 ` Junio C Hamano
2019-08-17 18:41 ` [PATCH v4 22/24] merge-recursive: rename MERGE_RECURSIVE_* to MERGE_VARIANT_* Elijah Newren
2019-08-17 18:41 ` [PATCH v4 23/24] merge-recursive: add sanity checks for relevant merge_options Elijah Newren
2019-08-17 18:41 ` [PATCH v4 24/24] merge-recursive: alphabetize include list Elijah Newren
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