From: Junio C Hamano <gitster@pobox.com>
To: Phillip Wood <phillip.wood123@gmail.com>
Cc: Rohit Ashiwal <rohit.ashiwal265@gmail.com>,
Johannes.Schindelin@gmx.de, git@vger.kernel.org,
martin.agren@gmail.com, newren@gmail.com, t.gummerer@gmail.com
Subject: Re: [GSoC][PATCH v2 3/6] rebase -i: support --committer-date-is-author-date
Date: Tue, 13 Aug 2019 10:06:53 -0700 [thread overview]
Message-ID: <xmqqsgq5805u.fsf@gitster-ct.c.googlers.com> (raw)
In-Reply-To: <7274e753-f75c-ad9a-9c2c-7ba8abc32971@gmail.com> (Phillip Wood's message of "Tue, 13 Aug 2019 11:38:57 +0100")
Phillip Wood <phillip.wood123@gmail.com> writes:
>> + if (opts->committer_date_is_author_date) {
>> + size_t len;
>> + int res = -1;
>> + struct strbuf datebuf = STRBUF_INIT;
>> + char *date = read_author_date_or_null();
>
> You must always check the return value of functions that might return
> NULL. In this case we should return an error as you do in try_to
> _commit() later
>
>> +
>> + strbuf_addf(&datebuf, "@%s", date);
>
> GNU printf() will add something like '(null)' to the buffer if you
> pass a NULL pointer so I don't think we can be sure that this will not
> increase the length of the buffer if date is NULL.
And an implementation that is not as lenient may outright segfault.
>> + if (opts->committer_date_is_author_date) {
>> + int len = strlen(author);
>> + struct ident_split ident;
>> + struct strbuf date = STRBUF_INIT;
>> +
>> + split_ident_line(&ident, author, len);
>> +
>> + if (!ident.date_begin)
>> + return error(_("corrupted author without date information"));
>
> We return an error if we cannot get the date - this is exactly what we
> should be doing above. It is also great to see a single version of
> this being used whether or not we are amending.
>
>> +
>> + strbuf_addf(&date, "@%s",ident.date_begin);
>
> I think we should use %s.* and ident.date_end to be sure we getting
> what we want. Your version is OK if the author is formatted correctly
> but I'm uneasy about relying on that when we can get the verified end
> from ident.
If the author line is not formatted correctly, split_ident_line()
would notice and return NULL in these fields, I think (in other
words, my take on the call to split_ident_line() above is not
necessarily done in order to "split", but primarily to validate that
the line is formatted correctly---and find the beginning of the
timestamp field).
But your "pay attention to date_end" raises an interesting point.
The string that follows ident.date_begin would be a large integer
(i.e. number of seconds since epoch), a SP, a positive or negative
sign (i.e. east or west of GMT), 4 digits (i.e. timezone offset), so
if you want to leave something like "@1544328981" in the buffer, you
need to stop at .date_end to omit the timezone information.
On the other hand, if you do want the timezone information as well
(which I think is the case for this codepath), you should not stop
at there and have something like "@1544328981 +0900", the code as
written would give better result.
next prev parent reply other threads:[~2019-08-13 17:06 UTC|newest]
Thread overview: 96+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-06 17:36 [GSoC][PATCHl 0/6] rebase -i: support more options Rohit Ashiwal
2019-08-06 17:36 ` [GSoC][PATCHl 1/6] rebase -i: add --ignore-whitespace flag Rohit Ashiwal
2019-08-07 5:38 ` Junio C Hamano
2019-08-07 20:25 ` Rohit Ashiwal
2019-08-08 16:44 ` Phillip Wood
2019-08-12 17:43 ` Rohit Ashiwal
2019-08-06 17:36 ` [GSoC][PATCHl 2/6] sequencer: add NULL checks under read_author_script Rohit Ashiwal
2019-08-06 17:36 ` [GSoC][PATCHl 3/6] rebase -i: support --committer-date-is-author-date Rohit Ashiwal
2019-08-08 11:29 ` Phillip Wood
2019-08-08 16:00 ` Junio C Hamano
2019-08-06 17:36 ` [GSoC][PATCHl 4/6] sequencer: rename amend_author to author_to_rename Rohit Ashiwal
2019-08-08 11:30 ` Phillip Wood
2019-08-06 17:36 ` [GSoC][PATCHl 5/6] rebase -i: support --ignore-date Rohit Ashiwal
2019-08-07 19:41 ` Johannes Schindelin
2019-08-07 20:22 ` Junio C Hamano
2019-08-07 20:33 ` Rohit Ashiwal
2019-08-08 11:42 ` Phillip Wood
2019-08-08 16:53 ` Phillip Wood
2019-08-06 17:36 ` [GSoC][PATCHl 6/6] rebase: add --author-date-is-committer-date Rohit Ashiwal
2019-08-08 11:42 ` Phillip Wood
2019-08-12 19:42 ` [GSoC][PATCH v2 0/6] rebase -i: support more options Rohit Ashiwal
2019-08-12 19:42 ` [GSoC][PATCH v2 1/6] rebase -i: add --ignore-whitespace flag Rohit Ashiwal
2019-08-13 12:07 ` Phillip Wood
2019-08-12 19:42 ` [GSoC][PATCH v2 2/6] sequencer: add NULL checks under read_author_script Rohit Ashiwal
2019-08-12 19:42 ` [GSoC][PATCH v2 3/6] rebase -i: support --committer-date-is-author-date Rohit Ashiwal
2019-08-13 10:38 ` Phillip Wood
2019-08-13 12:09 ` Phillip Wood
2019-08-13 17:06 ` Junio C Hamano [this message]
2019-08-14 18:38 ` Phillip Wood
2019-08-13 13:35 ` Phillip Wood
2019-08-12 19:42 ` [GSoC][PATCH v2 4/6] sequencer: rename amend_author to author_to_rename Rohit Ashiwal
2019-08-13 13:29 ` Phillip Wood
2019-08-12 19:42 ` [GSoC][PATCH v2 5/6] rebase -i: support --ignore-date Rohit Ashiwal
2019-08-13 13:28 ` Phillip Wood
2019-08-13 17:21 ` Junio C Hamano
2019-08-14 18:47 ` Phillip Wood
2019-08-13 21:45 ` Junio C Hamano
2019-08-14 18:51 ` Phillip Wood
2019-08-14 19:33 ` Junio C Hamano
2019-08-17 9:28 ` Phillip Wood
2019-08-12 19:43 ` [GSoC][PATCH v2 6/6] rebase: add --author-date-is-committer-date Rohit Ashiwal
2019-08-13 17:28 ` Junio C Hamano
2019-08-20 3:45 ` [PATCH v3 0/6] rebase -i: support more options Rohit Ashiwal
2019-08-20 3:45 ` [PATCH v3 1/6] rebase -i: add --ignore-whitespace flag Rohit Ashiwal
2019-08-20 18:40 ` Phillip Wood
2019-08-20 18:47 ` Rohit Ashiwal
2019-08-20 3:45 ` [PATCH v3 2/6] sequencer: add NULL checks under read_author_script Rohit Ashiwal
2019-08-23 15:20 ` Junio C Hamano
2019-08-20 3:45 ` [PATCH v3 3/6] rebase -i: support --committer-date-is-author-date Rohit Ashiwal
2019-08-20 13:32 ` Phillip Wood
2019-08-20 3:45 ` [PATCH v3 4/6] sequencer: rename amend_author to author_to_rename Rohit Ashiwal
2019-08-20 3:45 ` [PATCH v3 5/6] rebase -i: support --ignore-date Rohit Ashiwal
2019-08-20 13:45 ` Phillip Wood
2019-08-20 17:42 ` Junio C Hamano
2019-08-20 18:30 ` Phillip Wood
2019-08-20 3:45 ` [GSoC][PATCH v2 6/6] rebase: add --author-date-is-committer-date Rohit Ashiwal
2019-08-20 4:00 ` Rohit Ashiwal
2019-08-20 3:45 ` [PATCH v3 6/6] rebase: add --reset-author-date Rohit Ashiwal
2019-08-20 3:54 ` [PATCH v3 0/6] rebase -i: support more options Rohit Ashiwal
2019-08-20 13:56 ` Phillip Wood
2019-08-20 17:53 ` Junio C Hamano
2019-08-20 18:37 ` Phillip Wood
2019-09-07 11:50 ` [PATCH v4 " Rohit Ashiwal
2019-09-07 11:50 ` [PATCH v4 1/6] rebase -i: add --ignore-whitespace flag Rohit Ashiwal
2019-10-04 9:29 ` Phillip Wood
2019-10-05 18:12 ` Elijah Newren
2019-10-06 17:57 ` Rohit Ashiwal
2019-09-07 11:50 ` [PATCH v4 2/6] sequencer: allow callers of read_author_script() to ignore fields Rohit Ashiwal
2019-09-07 11:50 ` [PATCH v4 3/6] rebase -i: support --committer-date-is-author-date Rohit Ashiwal
2019-10-04 9:37 ` Phillip Wood
2019-10-06 17:57 ` Rohit Ashiwal
2019-10-24 13:28 ` Phillip Wood
2019-09-07 11:50 ` [PATCH v4 4/6] sequencer: rename amend_author to author_to_rename Rohit Ashiwal
2019-09-07 11:50 ` [PATCH v4 5/6] rebase -i: support --ignore-date Rohit Ashiwal
2019-09-07 20:56 ` Rohit Ashiwal
2019-09-27 10:00 ` Phillip Wood
2019-10-06 17:57 ` Rohit Ashiwal
2019-10-24 20:36 ` Phillip Wood
2019-09-07 11:50 ` [PATCH v4 6/6] rebase: add --reset-author-date Rohit Ashiwal
2019-09-09 18:02 ` [PATCH v4 0/6] rebase -i: support more options Junio C Hamano
2019-09-09 18:51 ` Phillip Wood
2019-09-09 19:24 ` Junio C Hamano
2019-11-01 13:59 ` [PATCH v5 " Rohit Ashiwal
2019-11-01 13:59 ` [PATCH v5 1/6] rebase -i: add --ignore-whitespace flag Rohit Ashiwal
2019-11-01 13:59 ` [PATCH v5 2/6] sequencer: allow callers of read_author_script() to ignore fields Rohit Ashiwal
2019-11-01 14:00 ` [PATCH v5 3/6] rebase -i: support --committer-date-is-author-date Rohit Ashiwal
2019-11-01 14:00 ` [PATCH v5 4/6] sequencer: rename amend_author to author_to_rename Rohit Ashiwal
2019-11-01 14:00 ` [PATCH v5 5/6] rebase -i: support --ignore-date Rohit Ashiwal
2019-11-02 7:32 ` Junio C Hamano
2019-11-02 7:48 ` Junio C Hamano
2019-11-01 14:00 ` [PATCH v5 6/6] rebase: add --reset-author-date Rohit Ashiwal
2019-11-02 7:34 ` Junio C Hamano
2019-11-21 6:14 ` [PATCH v5 0/6] rebase -i: support more options Junio C Hamano
2019-11-21 8:17 ` Alban Gruin
2019-11-22 6:32 ` Junio C Hamano
2019-11-28 11:14 ` Phillip Wood
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