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From: Alban Gruin <alban.gruin@gmail.com>
To: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Cc: git@vger.kernel.org, Junio C Hamano <gitster@pobox.com>,
	Phillip Wood <phillip.wood123@gmail.com>,
	Derrick Stolee <stolee@gmail.com>
Subject: Re: [PATCH v7 09/15] merge-resolve: rewrite in C
Date: Sat, 10 Apr 2021 16:17:32 +0200	[thread overview]
Message-ID: <025aad24-68e3-295b-1e3b-2a7250807276@gmail.com> (raw)
In-Reply-To: <nycvar.QRO.7.76.6.2103232257590.50@tvgsbejvaqbjf.bet>

Hi Johannes,

Le 23/03/2021 à 23:21, Johannes Schindelin a écrit :
> Hi Alban,
> 
> On Wed, 17 Mar 2021, Alban Gruin wrote:
> 
>> diff --git a/merge-strategies.c b/merge-strategies.c
>> index 2717af51fd..a51700dae5 100644
>> --- a/merge-strategies.c
>> +++ b/merge-strategies.c
>> @@ -272,3 +275,95 @@ int merge_all_index(struct index_state *istate, int oneshot, int quiet,
>>
>>  	return err;
>>  }
>> +
>> +static int fast_forward(struct repository *r, struct tree_desc *t,
>> +			int nr, int aggressive)
>> +{
>> +	struct unpack_trees_options opts;
>> +	struct lock_file lock = LOCK_INIT;
>> +
>> +	refresh_index(r->index, REFRESH_QUIET, NULL, NULL, NULL);
>> +	repo_hold_locked_index(r, &lock, LOCK_DIE_ON_ERROR);
> 
> Shouldn't we lock the index first, and _then_ refresh it? I guess not,
> seeing as we don't do that either in `cmd_status()`: there, we also
> refresh the index and _then_ lock it.
> 

Yeah, I don't think I saw a lock/refresh sequence, but I may be wrong.

>> +
>> +	memset(&opts, 0, sizeof(opts));
>> +	opts.head_idx = 1;
>> +	opts.src_index = r->index;
>> +	opts.dst_index = r->index;
>> +	opts.merge = 1;
>> +	opts.update = 1;
>> +	opts.aggressive = aggressive;
>> +
>> +	if (nr == 1)
>> +		opts.fn = oneway_merge;
>> +	else if (nr == 2) {
>> +		opts.fn = twoway_merge;
>> +		opts.initial_checkout = is_index_unborn(r->index);
>> +	} else if (nr >= 3) {
>> +		opts.fn = threeway_merge;
>> +		opts.head_idx = nr - 1;
>> +	}
> 
> Given the function's name `fast_forward()`, I have to admit that I
> somewhat stumbled over these merges.
>> +
>> +	if (unpack_trees(nr, t, &opts))
>> +		return -1;
>> +

I just noticed that the lock is not released if there is an error here.

>> +	if (write_locked_index(r->index, &lock, COMMIT_LOCK))
>> +		return error(_("unable to write new index file"));
>> +
>> +	return 0;
>> +}
>> +
>> +static int add_tree(struct tree *tree, struct tree_desc *t)
>> +{
>> +	if (parse_tree(tree))
>> +		return -1;
>> +
>> +	init_tree_desc(t, tree->buffer, tree->size);
>> +	return 0;
>> +}
> 
> This is a really trivial helper, but it is used a couple times below, so
> it makes sense to have it encapsulated in a separate function.
> 
>> +
>> +int merge_strategies_resolve(struct repository *r,
>> +			     struct commit_list *bases, const char *head_arg,
>> +			     struct commit_list *remote)
> 
> Since it is a list, and since the original variable in the shell script
> had been named in the plural form, let's do the same here: `remotes`.
> 

This one is supposed to contain only one commit, so I'm not really
conviced that this parameter should be in the plural form.

>> +{
>> +	struct tree_desc t[MAX_UNPACK_TREES];
>> +	struct object_id head, oid;
>> +	struct commit_list *i;
>> +	int nr = 0;
>> +
>> +	if (head_arg)
>> +		get_oid(head_arg, &head);
>> +
>> +	puts(_("Trying simple merge."));
> 
> Good. Usually I would recommend to print this to `stderr`, but the
> original script prints it to `stdout`, so we should do that here, too.
> 
>> +
>> +	for (i = bases; i && i->item; i = i->next) {
>> +		if (add_tree(repo_get_commit_tree(r, i->item), t + (nr++)))
>> +			return 2;
> 
> Since we're talking about a library function, not a `cmd_*()` function,
> the return value on error should probably be negative.
> 
> Even better would be to let the function return an `enum` that contains
> labels with more intuitive meaning than "2".
> 
> It _is_ the expected exit code when calling `git merge-resolve`, of course
> (because of the `|| exit 2` after that `read-tree` call), but I wonder
> whether a better layer for that `2` would be the `cmd_merge_resolve()`
> function, letting `merge_strategies_resolve()` report failures in a more
> fine-grained fashion.
> 

Right -- I'll see what I can do here.

>> +	}
>> +
>> +	if (head_arg) {
> 
> It would probably be easier to read if the `if (head_arg)` clause above
> was merged into this here clause.
> 
>> +		struct tree *tree = parse_tree_indirect(&head);
>> +		if (add_tree(tree, t + (nr++)))
>> +			return 2;
>> +	}
>> +
>> +	if (remote && add_tree(repo_get_commit_tree(r, remote->item), t + (nr++)))
>> +		return 2;
> 
> You get away with assuming that `remotes` only contains at most a single
> entry because `cmd_merge_resolve()` verified it.
> 
> However, as the intention is to use this as a library function, I think
> the input validation needs to be moved here instead of relying on all
> callers to verify that they send at most one "remote" ref.
> 
> Other than that, this patch looks good to me.
> 
Well, this condition checks that there is one commit, and if so, uses it
to call add_tree().  I don't see the mistake here.

Cheers,
Alban

> Thanks,
> Dscho
> 



  reply	other threads:[~2021-04-10 14:17 UTC|newest]

Thread overview: 193+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-25 12:19 [RFC PATCH v1 00/17] Rewrite the remaining merge strategies from shell to C Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 01/17] t6027: modernise tests Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 02/17] merge-one-file: rewrite in C Alban Gruin
2020-06-25 14:55   ` Chris Torek
2020-06-25 15:16   ` Phillip Wood
2020-06-25 18:17     ` Phillip Wood
2020-06-26 14:33       ` Phillip Wood
2020-07-12 11:22     ` Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 03/17] merge-one-file: remove calls to external processes Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 04/17] merge-one-file: use error() instead of fprintf(stderr, ...) Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 05/17] merge-one-file: libify merge_one_file() Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 06/17] merge-index: libify merge_one_path() and merge_all() Alban Gruin
2020-06-26 10:13   ` Phillip Wood
2020-06-26 14:32     ` Phillip Wood
2020-07-12 11:36     ` Alban Gruin
2020-07-12 18:02       ` Phillip Wood
2020-07-12 20:10         ` Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 07/17] merge-resolve: rewrite in C Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 08/17] merge-resolve: remove calls to external processes Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 09/17] merge-resolve: libify merge_resolve() Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 10/17] merge-recursive: move better_branch_name() to merge.c Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 11/17] merge-octopus: rewrite in C Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 12/17] merge-octopus: remove calls to external processes Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 13/17] merge-octopus: libify merge_octopus() Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 14/17] merge: use the "resolve" strategy without forking Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 15/17] merge: use the "octopus" " Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 16/17] sequencer: use the "resolve" " Alban Gruin
2020-06-25 16:11   ` Phillip Wood
2020-07-12 11:27     ` Alban Gruin
2020-06-25 12:19 ` [RFC PATCH v1 17/17] sequencer: use the "octopus" merge " Alban Gruin
2020-09-01 10:56 ` [PATCH v2 00/11] Rewrite the remaining merge strategies from shell to C Alban Gruin
2020-09-01 10:56   ` [PATCH v2 01/11] t6027: modernise tests Alban Gruin
2020-09-01 10:56   ` [PATCH v2 02/11] merge-one-file: rewrite in C Alban Gruin
2020-09-01 21:06     ` Junio C Hamano
2020-09-02 14:50       ` Alban Gruin
2020-09-01 10:56   ` [PATCH v2 03/11] merge-index: libify merge_one_path() and merge_all() Alban Gruin
2020-09-01 21:11     ` Junio C Hamano
2020-09-02 15:37       ` Alban Gruin
2020-09-01 10:56   ` [PATCH v2 04/11] merge-index: don't fork if the requested program is `git-merge-one-file' Alban Gruin
2020-09-01 10:56   ` [PATCH v2 05/11] merge-resolve: rewrite in C Alban Gruin
2020-09-01 10:57   ` [PATCH v2 06/11] merge-recursive: move better_branch_name() to merge.c Alban Gruin
2020-09-01 10:57   ` [PATCH v2 07/11] merge-octopus: rewrite in C Alban Gruin
2020-09-01 10:57   ` [PATCH v2 08/11] merge: use the "resolve" strategy without forking Alban Gruin
2020-09-01 10:57   ` [PATCH v2 09/11] merge: use the "octopus" " Alban Gruin
2020-09-01 10:57   ` [PATCH v2 10/11] sequencer: use the "resolve" " Alban Gruin
2020-09-01 10:57   ` [PATCH v2 11/11] sequencer: use the "octopus" merge " Alban Gruin
2020-10-05 12:26   ` [PATCH v3 00/11] Rewrite the remaining merge strategies from shell to C Alban Gruin
2020-10-05 12:26     ` [PATCH v3 01/11] t6027: modernise tests Alban Gruin
2020-10-06 20:50       ` Junio C Hamano
2020-10-05 12:26     ` [PATCH v3 02/11] merge-one-file: rewrite in C Alban Gruin
2020-10-06 22:01       ` Junio C Hamano
2020-10-21 19:47         ` Alban Gruin
2020-10-21 20:28           ` Junio C Hamano
2020-10-21 21:20             ` Junio C Hamano
2020-10-21 20:30           ` Junio C Hamano
2020-10-05 12:26     ` [PATCH v3 03/11] merge-index: libify merge_one_path() and merge_all() Alban Gruin
2020-10-09  4:48       ` Junio C Hamano
2020-11-06 19:53         ` Alban Gruin
2020-10-05 12:26     ` [PATCH v3 04/11] merge-index: don't fork if the requested program is `git-merge-one-file' Alban Gruin
2020-10-16 19:07       ` Junio C Hamano
2020-10-05 12:26     ` [PATCH v3 05/11] merge-resolve: rewrite in C Alban Gruin
2020-10-16 19:19       ` Junio C Hamano
2020-11-06 19:53         ` Alban Gruin
2020-10-05 12:26     ` [PATCH v3 06/11] merge-recursive: move better_branch_name() to merge.c Alban Gruin
2020-10-05 12:26     ` [PATCH v3 07/11] merge-octopus: rewrite in C Alban Gruin
2020-10-05 12:26     ` [PATCH v3 08/11] merge: use the "resolve" strategy without forking Alban Gruin
2020-10-05 12:26     ` [PATCH v3 09/11] merge: use the "octopus" " Alban Gruin
2020-10-05 12:26     ` [PATCH v3 10/11] sequencer: use the "resolve" " Alban Gruin
2020-10-05 12:26     ` [PATCH v3 11/11] sequencer: use the "octopus" merge " Alban Gruin
2020-10-07  6:57     ` [PATCH v3 00/11] Rewrite the remaining merge strategies from shell to C Johannes Schindelin
2020-11-13 11:04     ` [PATCH v4 00/12] " Alban Gruin
2020-11-13 11:04       ` [PATCH v4 01/12] t6027: modernise tests Alban Gruin
2020-11-13 11:04       ` [PATCH v4 02/12] update-index: move add_cacheinfo() to read-cache.c Alban Gruin
2020-11-13 11:04       ` [PATCH v4 03/12] merge-one-file: rewrite in C Alban Gruin
2020-11-13 11:04       ` [PATCH v4 04/12] merge-index: libify merge_one_path() and merge_all() Alban Gruin
2020-11-13 11:04       ` [PATCH v4 05/12] merge-index: don't fork if the requested program is `git-merge-one-file' Alban Gruin
2020-11-13 11:04       ` [PATCH v4 06/12] merge-resolve: rewrite in C Alban Gruin
2020-11-13 11:04       ` [PATCH v4 07/12] merge-recursive: move better_branch_name() to merge.c Alban Gruin
2020-11-13 11:04       ` [PATCH v4 08/12] merge-octopus: rewrite in C Alban Gruin
2020-11-13 11:04       ` [PATCH v4 09/12] merge: use the "resolve" strategy without forking Alban Gruin
2020-11-13 11:04       ` [PATCH v4 10/12] merge: use the "octopus" " Alban Gruin
2020-11-13 11:04       ` [PATCH v4 11/12] sequencer: use the "resolve" " Alban Gruin
2020-11-13 11:04       ` [PATCH v4 12/12] sequencer: use the "octopus" merge " Alban Gruin
2020-11-16 10:21       ` [PATCH v5 00/12] Rewrite the remaining merge strategies from shell to C Alban Gruin
2020-11-16 10:21         ` [PATCH v5 01/12] t6027: modernise tests Alban Gruin
2020-11-16 10:21         ` [PATCH v5 02/12] update-index: move add_cacheinfo() to read-cache.c Alban Gruin
2020-11-16 10:21         ` [PATCH v5 03/12] merge-one-file: rewrite in C Alban Gruin
2020-11-16 10:21         ` [PATCH v5 04/12] merge-index: libify merge_one_path() and merge_all() Alban Gruin
2020-11-16 10:21         ` [PATCH v5 05/12] merge-index: don't fork if the requested program is `git-merge-one-file' Alban Gruin
2020-11-16 10:21         ` [PATCH v5 06/12] merge-resolve: rewrite in C Alban Gruin
2020-11-16 10:21         ` [PATCH v5 07/12] merge-recursive: move better_branch_name() to merge.c Alban Gruin
2020-11-16 10:21         ` [PATCH v5 08/12] merge-octopus: rewrite in C Alban Gruin
2020-11-16 10:21         ` [PATCH v5 09/12] merge: use the "resolve" strategy without forking Alban Gruin
2020-11-16 10:21         ` [PATCH v5 10/12] merge: use the "octopus" " Alban Gruin
2020-11-16 10:21         ` [PATCH v5 11/12] sequencer: use the "resolve" " Alban Gruin
2020-11-16 10:21         ` [PATCH v5 12/12] sequencer: use the "octopus" merge " Alban Gruin
2020-11-24 11:53         ` [PATCH v6 00/13] Rewrite the remaining merge strategies from shell to C Alban Gruin
2020-11-24 11:53           ` [PATCH v6 01/13] t6407: modernise tests Alban Gruin
2020-11-24 11:53           ` [PATCH v6 02/13] t6060: modify multiple files to expose a possible issue with merge-index Alban Gruin
2020-11-24 11:53           ` [PATCH v6 03/13] update-index: move add_cacheinfo() to read-cache.c Alban Gruin
2020-12-22 20:54             ` Junio C Hamano
2020-11-24 11:53           ` [PATCH v6 04/13] merge-one-file: rewrite in C Alban Gruin
2020-12-22 21:36             ` Junio C Hamano
2021-01-03 22:41               ` Alban Gruin
2021-01-08  6:54                 ` Junio C Hamano
2020-11-24 11:53           ` [PATCH v6 05/13] merge-index: libify merge_one_path() and merge_all() Alban Gruin
2021-01-05 15:59             ` Derrick Stolee
2021-01-05 23:20               ` Alban Gruin
2020-11-24 11:53           ` [PATCH v6 06/13] merge-index: don't fork if the requested program is `git-merge-one-file' Alban Gruin
2021-01-05 16:11             ` Derrick Stolee
2021-01-05 17:35               ` Martin Ågren
2021-01-05 23:20                 ` Alban Gruin
2021-01-05 23:20               ` Alban Gruin
2021-01-06  2:04                 ` Junio C Hamano
2021-01-10 17:15                   ` Alban Gruin
2021-01-10 20:51                     ` Junio C Hamano
2021-03-08 20:32                       ` Alban Gruin
2020-11-24 11:53           ` [PATCH v6 07/13] merge-resolve: rewrite in C Alban Gruin
2020-11-24 11:53           ` [PATCH v6 08/13] merge-recursive: move better_branch_name() to merge.c Alban Gruin
2021-01-05 16:19             ` Derrick Stolee
2020-11-24 11:53           ` [PATCH v6 09/13] merge-octopus: rewrite in C Alban Gruin
2021-01-05 16:40             ` Derrick Stolee
2020-11-24 11:53           ` [PATCH v6 10/13] merge: use the "resolve" strategy without forking Alban Gruin
2021-01-05 16:45             ` Derrick Stolee
2020-11-24 11:53           ` [PATCH v6 11/13] merge: use the "octopus" " Alban Gruin
2020-11-24 11:53           ` [PATCH v6 12/13] sequencer: use the "resolve" " Alban Gruin
2020-11-24 11:53           ` [PATCH v6 13/13] sequencer: use the "octopus" merge " Alban Gruin
2020-11-24 19:34           ` [PATCH v6 00/13] Rewrite the remaining merge strategies from shell to C SZEDER Gábor
2021-01-05 16:50           ` Derrick Stolee
2021-03-17 20:49           ` [PATCH v7 00/15] " Alban Gruin
2021-03-17 20:49             ` [PATCH v7 01/15] t6407: modernise tests Alban Gruin
2021-03-17 20:49             ` [PATCH v7 02/15] t6060: modify multiple files to expose a possible issue with merge-index Alban Gruin
2021-03-17 20:49             ` [PATCH v7 03/15] t6060: add tests for removed files Alban Gruin
2021-03-22 21:36               ` Johannes Schindelin
2021-03-23 20:43                 ` Alban Gruin
2021-03-17 20:49             ` [PATCH v7 04/15] merge-index: libify merge_one_path() and merge_all() Alban Gruin
2021-03-17 20:49             ` [PATCH v7 05/15] merge-index: drop the index Alban Gruin
2021-03-17 20:49             ` [PATCH v7 06/15] merge-index: add a new way to invoke `git-merge-one-file' Alban Gruin
2021-03-17 20:49             ` [PATCH v7 07/15] update-index: move add_cacheinfo() to read-cache.c Alban Gruin
2021-03-22 21:59               ` Johannes Schindelin
2021-03-23 20:45                 ` Alban Gruin
2021-03-17 20:49             ` [PATCH v7 08/15] merge-one-file: rewrite in C Alban Gruin
2021-03-22 22:20               ` Johannes Schindelin
2021-03-23 20:53                 ` Alban Gruin
2021-03-24  9:10                   ` Johannes Schindelin
2021-04-10 14:17                     ` Alban Gruin
2021-03-17 20:49             ` [PATCH v7 09/15] merge-resolve: " Alban Gruin
2021-03-23 22:21               ` Johannes Schindelin
2021-04-10 14:17                 ` Alban Gruin [this message]
2021-03-17 20:49             ` [PATCH v7 10/15] merge-recursive: move better_branch_name() to merge.c Alban Gruin
2021-03-17 20:49             ` [PATCH v7 11/15] merge-octopus: rewrite in C Alban Gruin
2021-03-23 23:58               ` Johannes Schindelin
2021-03-17 20:49             ` [PATCH v7 12/15] merge: use the "resolve" strategy without forking Alban Gruin
2021-03-17 20:49             ` [PATCH v7 13/15] merge: use the "octopus" " Alban Gruin
2021-03-17 20:49             ` [PATCH v7 14/15] sequencer: use the "resolve" " Alban Gruin
2021-03-17 20:49             ` [PATCH v7 15/15] sequencer: use the "octopus" merge " Alban Gruin
2022-08-09 18:54             ` [PATCH v8 00/14] Rewrite the remaining merge strategies from shell to C Alban Gruin
2022-08-09 18:54               ` [PATCH v8 01/14] t6060: modify multiple files to expose a possible issue with merge-index Alban Gruin
2022-08-09 18:54               ` [PATCH v8 02/14] t6060: add tests for removed files Alban Gruin
2022-08-09 18:54               ` [PATCH v8 03/14] merge-index: libify merge_one_path() and merge_all() Alban Gruin
2022-08-17  2:10                 ` Ævar Arnfjörð Bjarmason
2022-08-09 18:54               ` [PATCH v8 04/14] merge-index: drop the index Alban Gruin
2022-08-09 18:54               ` [PATCH v8 05/14] merge-index: add a new way to invoke `git-merge-one-file' Alban Gruin
2022-08-09 21:36                 ` Johannes Schindelin
2022-08-10 13:14                   ` Phillip Wood
2022-08-09 18:54               ` [PATCH v8 06/14] update-index: move add_cacheinfo() to read-cache.c Alban Gruin
2022-08-09 18:54               ` [PATCH v8 07/14] merge-one-file: rewrite in C Alban Gruin
2022-08-09 22:01                 ` Johannes Schindelin
2022-08-09 18:54               ` [PATCH v8 08/14] merge-resolve: " Alban Gruin
2022-08-10 15:03                 ` Phillip Wood
2022-08-10 21:20                   ` Junio C Hamano
2022-08-16 12:09                     ` Johannes Schindelin
2022-08-16 19:36                       ` Junio C Hamano
2022-08-17  9:42                         ` Johannes Schindelin
2022-08-17 19:06                           ` Elijah Newren
2022-08-17 19:18                             ` Junio C Hamano
2022-08-18 14:24                               ` Ævar Arnfjörð Bjarmason
2022-08-18 17:32                                 ` Junio C Hamano
2022-08-19  1:43                                 ` Elijah Newren
2022-08-19  2:45                                   ` Ævar Arnfjörð Bjarmason
2022-08-19  4:27                                     ` Elijah Newren
2022-08-17 19:12                           ` Junio C Hamano
2022-08-16 12:17                   ` Johannes Schindelin
2022-08-16 14:02                     ` Phillip Wood
2022-08-17  2:16                 ` Ævar Arnfjörð Bjarmason
2022-08-18 14:43                 ` Ævar Arnfjörð Bjarmason
2022-08-09 18:54               ` [PATCH v8 09/14] merge-recursive: move better_branch_name() to merge.c Alban Gruin
2022-08-09 18:54               ` [PATCH v8 10/14] merge-octopus: rewrite in C Alban Gruin
2022-08-09 18:54               ` [PATCH v8 11/14] merge: use the "resolve" strategy without forking Alban Gruin
2022-08-13 16:18                 ` Junio C Hamano
2022-08-09 18:54               ` [PATCH v8 12/14] merge: use the "octopus" " Alban Gruin
2022-08-09 18:54               ` [PATCH v8 13/14] sequencer: use the "resolve" " Alban Gruin
2022-08-09 18:54               ` [PATCH v8 14/14] sequencer: use the "octopus" " Alban Gruin

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