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From: Jeff King <peff@peff.net>
To: Doan Tran Cong Danh <congdanhqx@gmail.com>
Cc: git@vger.kernel.org, gitster@pobox.com
Subject: Re: [PATCH v6 9/9] sequencer: fallback to sane label in making rebase todo list
Date: Mon, 11 Nov 2019 03:39:40 -0500	[thread overview]
Message-ID: <20191111083940.GC17984@sigill.intra.peff.net> (raw)
In-Reply-To: <78daf050de8c0cdc81fed4adc8fef92d1768c63a.1573452046.git.congdanhqx@gmail.com>

On Mon, Nov 11, 2019 at 01:03:42PM +0700, Doan Tran Cong Danh wrote:

> In later stage of rebasing, we will make a ref in
> refs/rewritten/<label>, this label is extracted from the subject of
> current merge commit.
> 
> If that subject has forbidden character for refname, git couldn't create
> the rewritten ref. One such case is the merge commit subject has
> a multibyte character encoded in ISO-2022-JP.
> 
> Provide a sane fallback in order to help git-rebase works in such case

Good find. Not having worked much with this part of the sequencer code,
I don't have a strong opinion on the fallback label. But it seems better
than the current behavior would be.

I suspect there may be other subtle problems, too, for filesystems that
can't represent some part of the subject (e.g., I wonder if some of your
ISO-2022-JP tests might already have trouble on HFS+, which excepts all
paths to be UTF-8).

> @@ -4607,9 +4608,15 @@ static int make_script_with_merges(struct pretty_print_context *pp,
>  			if (isspace(*p1))
>  				*(char *)p1 = '-';
>  
> +		hex_oid = oid_to_hex(&commit->object.oid);
> +
> +		if (check_refname_format(label.buf, REFNAME_ALLOW_ONELEVEL) < 0) {
> +			strbuf_reset(&label);
> +			strbuf_addf(&label, "label-%s", hex_oid);
> +		}
> +
>  		strbuf_reset(&buf);
> -		strbuf_addf(&buf, "%s -C %s",
> -			    cmd_merge, oid_to_hex(&commit->object.oid));
> +		strbuf_addf(&buf, "%s -C %s", cmd_merge, hex_oid);

A minor nit, but I think it's better here to just call oid_to_hex()
twice, rather than assigning to the hex_oid variable. It's returning a
pointer to a static buffer, so holding onto the pointers for too long is
dangerous. What you have here is definitely OK, because nothing
interesting happens in between, but seeing any assignment of the result
of "oid_to_hex" makes auditing harder.

And it's not like it's that expensive, or that this is
performance-critical code (and if it were, we'd do better to use
oid_to_hex_r() directly into the strbuf anyway).

-Peff

  reply	other threads:[~2019-11-11  8:39 UTC|newest]

Thread overview: 89+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-31  9:26 [PATCH 0/3] Linux with musl libc improvement Doan Tran Cong Danh
2019-10-31  9:26 ` [PATCH 1/3] t0028: eliminate non-standard usage of printf Doan Tran Cong Danh
2019-10-31 17:41   ` Jeff King
2019-11-01  1:33     ` Danh Doan
2019-10-31 19:50   ` brian m. carlson
2019-10-31  9:26 ` [PATCH 2/3] configure.ac: define ICONV_OMITS_BOM if necessary Doan Tran Cong Danh
2019-10-31 18:11   ` Jeff King
2019-10-31 20:02     ` brian m. carlson
2019-11-01  1:40     ` Danh Doan
2019-10-31  9:26 ` [PATCH 3/3] sequencer: reencode to utf-8 before arrange rebase's todo list Doan Tran Cong Danh
2019-10-31 10:38   ` Johannes Schindelin
2019-10-31 19:26     ` Jeff King
2019-11-01  4:49       ` Danh Doan
2019-11-01  8:25 ` [PATCH v2 0/3] Linux with musl libc improvement Doan Tran Cong Danh
2019-11-01  8:25   ` [PATCH v2 1/3] t0028: eliminate non-standard usage of printf Doan Tran Cong Danh
2019-11-01 16:54     ` Jeff King
2019-11-01  8:25   ` [PATCH v2 2/3] configure.ac: define ICONV_OMITS_BOM if necessary Doan Tran Cong Danh
2019-11-01 16:56     ` Jeff King
2019-11-02  0:43       ` Danh Doan
2019-11-01  8:25   ` [PATCH v2 3/3] sequencer: reencode to utf-8 before arrange rebase's todo list Doan Tran Cong Danh
2019-11-01 16:59     ` Jeff King
2019-11-02  1:02       ` Danh Doan
2019-11-02 12:20         ` Danh Doan
2019-11-05  8:00         ` Jeff King
2019-11-06  1:30           ` Junio C Hamano
2019-11-06  4:03             ` Jeff King
2019-11-06 10:03               ` Danh Doan
2019-11-07  5:56                 ` Jeff King
2019-11-06  9:19 ` [PATCH v3 0/8] Correct internal working and output encoding Doan Tran Cong Danh
2019-11-06  9:19   ` [PATCH v3 1/8] t0028: eliminate non-standard usage of printf Doan Tran Cong Danh
2019-11-06  9:20   ` [PATCH v3 2/8] configure.ac: define ICONV_OMITS_BOM if necessary Doan Tran Cong Danh
2019-11-06  9:20   ` [PATCH v3 3/8] t3900: demonstrate git-rebase problem with multi encoding Doan Tran Cong Danh
2019-11-06  9:20   ` [PATCH v3 4/8] sequencer: reencode to utf-8 before arrange rebase's todo list Doan Tran Cong Danh
2019-11-06  9:20   ` [PATCH v3 5/8] sequencer: reencode revert/cherry-pick's " Doan Tran Cong Danh
2019-11-06  9:20   ` [PATCH v3 6/8] sequencer: reencode squashing commit's message Doan Tran Cong Danh
2019-11-06  9:20   ` [PATCH v3 7/8] sequencer: reencode old merge-commit message Doan Tran Cong Danh
2019-11-06 15:39     ` Eric Sunshine
2019-11-06  9:20   ` [PATCH v3 8/8] sequencer: reencode commit message for am/rebase --show-current-patch Doan Tran Cong Danh
2019-11-07  2:56 ` [PATCH v4 0/8] Correct internal working and output encoding Doan Tran Cong Danh
2019-11-07  2:56   ` [PATCH v4 1/8] t0028: eliminate non-standard usage of printf Doan Tran Cong Danh
2019-11-07  2:56   ` [PATCH v4 2/8] configure.ac: define ICONV_OMITS_BOM if necessary Doan Tran Cong Danh
2019-11-07  6:18     ` Junio C Hamano
2019-11-07  2:56   ` [PATCH v4 3/8] t3900: demonstrate git-rebase problem with multi encoding Doan Tran Cong Danh
2019-11-07  6:02     ` Jeff King
2019-11-07  6:48       ` Danh Doan
2019-11-07  8:02         ` Jeff King
2019-11-07 10:51           ` Danh Doan
2019-11-11  8:22             ` Jeff King
2019-11-07  2:56   ` [PATCH v4 4/8] sequencer: reencode to utf-8 before arrange rebase's todo list Doan Tran Cong Danh
2019-11-07  6:04     ` Jeff King
2019-11-07  2:56   ` [PATCH v4 5/8] sequencer: reencode revert/cherry-pick's " Doan Tran Cong Danh
2019-11-07  6:06     ` Jeff King
2019-11-07  2:56   ` [PATCH v4 6/8] sequencer: reencode squashing commit's message Doan Tran Cong Danh
2019-11-07  6:15     ` Jeff King
2019-11-07  2:56   ` [PATCH v4 7/8] sequencer: reencode old merge-commit message Doan Tran Cong Danh
2019-11-07  2:56   ` [PATCH v4 8/8] sequencer: reencode commit message for am/rebase --show-current-patch Doan Tran Cong Danh
2019-11-07  6:32     ` Jeff King
2019-11-07  7:48       ` Danh Doan
2019-11-07  8:03         ` Jeff King
2019-11-07 16:32           ` Danh Doan
2019-11-08  9:43 ` [PATCH v5 0/9] Improve odd encoding integration Doan Tran Cong Danh
2019-11-08  9:43   ` [PATCH v5 1/9] t0028: eliminate non-standard usage of printf Doan Tran Cong Danh
2019-11-08  9:43   ` [PATCH v5 2/9] configure.ac: define ICONV_OMITS_BOM if necessary Doan Tran Cong Danh
2019-11-08  9:43   ` [PATCH v5 3/9] t3900: demonstrate git-rebase problem with multi encoding Doan Tran Cong Danh
2019-11-08  9:43   ` [PATCH v5 4/9] sequencer: reencode to utf-8 before arrange rebase's todo list Doan Tran Cong Danh
2019-11-08  9:43   ` [PATCH v5 5/9] sequencer: reencode revert/cherry-pick's " Doan Tran Cong Danh
2019-11-08  9:43   ` [PATCH v5 6/9] sequencer: reencode squashing commit's message Doan Tran Cong Danh
2019-11-08  9:43   ` [PATCH v5 7/9] sequencer: reencode old merge-commit message Doan Tran Cong Danh
2019-11-08  9:43   ` [PATCH v5 8/9] sequencer: reencode commit message for am/rebase --show-current-patch Doan Tran Cong Danh
2019-11-08  9:43   ` [PATCH v5 9/9] sequencer: fallback to sane label in making rebase todo list Doan Tran Cong Danh
2019-11-11  1:22   ` [PATCH v5 0/9] Improve odd encoding integration Junio C Hamano
2019-11-11  4:02   ` Junio C Hamano
2019-11-11  4:43     ` Danh Doan
2019-11-11  6:14     ` Junio C Hamano
2019-11-11  6:03 ` [PATCH v6 0/9] sequencer: handle other encoding better Doan Tran Cong Danh
2019-11-11  6:03   ` [PATCH v6 1/9] t0028: eliminate non-standard usage of printf Doan Tran Cong Danh
2019-11-11  6:03   ` [PATCH v6 2/9] configure.ac: define ICONV_OMITS_BOM if necessary Doan Tran Cong Danh
2019-11-11  6:03   ` [PATCH v6 3/9] t3900: demonstrate git-rebase problem with multi encoding Doan Tran Cong Danh
2019-11-11  6:03   ` [PATCH v6 4/9] sequencer: reencode to utf-8 before arrange rebase's todo list Doan Tran Cong Danh
2019-11-11  6:03   ` [PATCH v6 5/9] sequencer: reencode revert/cherry-pick's " Doan Tran Cong Danh
2019-11-11  6:03   ` [PATCH v6 6/9] sequencer: reencode squashing commit's message Doan Tran Cong Danh
2019-11-11  6:03   ` [PATCH v6 7/9] sequencer: reencode old merge-commit message Doan Tran Cong Danh
2019-11-11  6:03   ` [PATCH v6 8/9] sequencer: reencode commit message for am/rebase --show-current-patch Doan Tran Cong Danh
2019-11-11  6:03   ` [PATCH v6 9/9] sequencer: fallback to sane label in making rebase todo list Doan Tran Cong Danh
2019-11-11  8:39     ` Jeff King [this message]
2019-11-11 16:22       ` Phillip Wood
2019-11-11 18:26     ` Johannes Schindelin
2019-11-12  4:17       ` Junio C Hamano
2019-11-11  8:40   ` [PATCH v6 0/9] sequencer: handle other encoding better Jeff King

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