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From: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
To: Matthieu Moy <git@matthieu-moy.fr>
Cc: Per Lundberg <per.lundberg@hibox.tv>,
	Duy Nguyen <pclouds@gmail.com>,
	Git Mailing List <git@vger.kernel.org>,
	jost@tcs.ifi.lmu.de, Joshua Jensen <jjensen@workspacewhiz.com>,
	Junio C Hamano <gitster@pobox.com>,
	Clemens Buchacher <drizzd@gmx.net>,
	"Holger Hellmuth \(IKS\)" <hellmuth@ira.uka.de>,
	Kevin Ballard <kevin@sb.org>
Subject: Re: [RFC PATCH] Introduce "precious" file concept
Date: Mon, 12 Nov 2018 10:49:44 +0100	[thread overview]
Message-ID: <87o9au39s7.fsf@evledraar.gmail.com> (raw)
In-Reply-To: <1205132135.1189562.1542013731020.JavaMail.zimbra@matthieu-moy.fr>


On Mon, Nov 12 2018, Matthieu Moy wrote:

> "Per Lundberg" <per.lundberg@hibox.tv> wrote:
>
>> On 11/11/18 5:41 PM, Duy Nguyen wrote:
>> > On Sun, Nov 11, 2018 at 1:33 PM Ævar Arnfjörð Bjarmason
>> > <avarab@gmail.com> wrote:
>>
>> >> That will lose no data, and in the very rare cases where a checkout of
>> >> tracked files would overwrite an ignored pattern, we can just error out
>> >> (as we do with the "Ok to overwrite" branch removed) and tell the user
>> >> to delete the files to proceed.
>> > There's also the other side of the coin. If this refuse to overwrite
>> > triggers too often, it can become an annoyance.
>
> I may have missed some cases, but to me the cases when checkout may try
> to overwrite an ignored file are essentially:
>
> * Someone "git add"ed a file meant to be ignored by mistake (e.g.
>   "git add -f *.o").
>
> * A file that was meant to be kept private (e.g. config.mak.dev) ends
>   up being tracked. This may happen when we find a way to make per-developer
>   settings the same for everyone.

Yes, the cases under discussion here are all cases where a tracked file
clobbers a file matching a pattern in in .gitignore.

What I'd add to your list is:

* Some projects (I've seen this in the wild) add e.g. *.mp3 or whatever
  else usually doesn't belong in the repo as a "soft ignore". This is
  something we've never recommended, but have implicitly supported since
  the only caveats are a) you need a one-off "git add -f" and then
  they're tracked b) them being missing from "status" before being
  tracked c) the issue under discussion here.

* Cases where e.g. filename changes to a directory or globs because of
  that make this more complex.

> I both cases I'd want at least to be notified that something is going on,
> and in the second I'd probably want to keep my local file around.
>> If we feel thrashable is stretching it too far (which I don't think it
>> is), we could add a "core.ignore_files_are_trashable" setting that
>> brings back the old semantics, for those who have a strong feeling about it.
>
> May I remind an idea I sugested in an old thread: add an intermediate level
> where ignored files to be overwritten are renamed (eg. foo -> foo~ like Emacs'
> backup files):
>
> https://public-inbox.org/git/vpqd3t9656k.fsf@bauges.imag.fr/
>
> One advantage of the "rename" behavior is that it's safer that the current,
> but still not very disturbing for people who like the current behavior. This
> makes it a good candidate for a default behavior.
>
> This could come in complement with this thread's "precious" concept:
>
> * If you know what you're doing and know that such or such file is precious,
>   mark it as such and Git will never overwrite it.
>
> * If you don't know about precious files, just keep the default setting and
>   the worse that can happen is to get your file overwritten with a bakup
>   of the old version kept around.
>
> This would probably play better with a notion of "precious" files than with
> a notion of "trashable" files.

I used to think this foo -> foo~ approach made the most sense (and said
as much in
https://public-inbox.org/git/871s8qdzph.fsf@evledraar.gmail.com/) but I
think it's probably best not to do it and just error out, because:

 * We'd still need to handle the cases where "tests" the file collides
   with "tests" the directory. Then where do we move the colliding file?
   ~/.git/lost+found/* ? We could handle the subdir case with another
   special-case though...

 * I think such silent action will just leave users more confused, and
   in many cases (e.g. a merge) whatever message we print out will be
   missed in a deluge of other messaging, and they'll probably miss it.

   I'd like to avoid a case where a bunch of *~ files get committed
   because the user's workflow is (and some beginner git users do this):

       git pull && git add . && git commit && git push

   As the "pull" would now invoke a merge that would do this rename.

 * If I have the "foo" file open in my editor (a plausible way to run
   into this) I switch to another terminal, do the merge, miss the
   message, then re-save "foo". Now I have both "foo" and "foo~"
   on-disk. Another case where we should just refuse until the user
   resolves the situation to avoid the confusion.

  reply	other threads:[~2018-11-12  9:49 UTC|newest]

Thread overview: 86+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-08-17  5:21 git merge, .gitignore, and silently overwriting untracked files Joshua Jensen
2010-08-17 19:33 ` Junio C Hamano
2010-08-18 23:39   ` [PATCH] optionally disable overwriting of ignored files Clemens Buchacher
2010-08-19 10:41     ` Jakub Narebski
2010-08-20 18:48       ` Clemens Buchacher
2010-08-20 19:01         ` Joshua Jensen
2010-08-20 20:35     ` Junio C Hamano
2010-08-21  8:05       ` Clemens Buchacher
2010-08-22  7:25         ` Junio C Hamano
2010-08-22  8:20           ` Clemens Buchacher
2010-10-09 22:39         ` Kevin Ballard
2010-08-21 13:23       ` Clemens Buchacher
2010-10-09 13:52       ` [PATCH 0/5] do not overwrite untracked files in leading path Clemens Buchacher
2010-10-09 13:52       ` [PATCH 1/5] t7607: use test_commit and test_must_fail Clemens Buchacher
2010-10-10  6:35         ` Jonathan Nieder
2010-10-10  8:35           ` [PATCH 1/5 v2] t7607: use test-lib functions and check MERGE_HEAD Clemens Buchacher
2010-10-13 21:33             ` Junio C Hamano
2010-10-13 21:59             ` Junio C Hamano
2010-10-09 13:52       ` [PATCH 2/5] t7607: add leading-path tests Clemens Buchacher
2010-10-09 19:14         ` Johannes Sixt
2010-10-10  8:38           ` [PATCH 2/5 v2] " Clemens Buchacher
2010-10-09 13:52       ` [PATCH 3/5] add function check_ok_to_remove() Clemens Buchacher
2010-10-13 21:43         ` Junio C Hamano
2010-10-09 13:52       ` [PATCH 4/5] lstat_cache: optionally return match_len Clemens Buchacher
2010-10-09 13:53       ` [PATCH 5/5] do not overwrite files in leading path Clemens Buchacher
2010-10-13 21:57         ` Junio C Hamano
2010-10-13 22:34           ` Clemens Buchacher
2010-10-15  6:48             ` Clemens Buchacher
2010-10-15 18:47               ` Junio C Hamano
2010-08-20 20:46     ` [PATCH] optionally disable overwriting of ignored files Junio C Hamano
2010-08-21  6:48       ` [PATCH v2] " Clemens Buchacher
2010-08-23  8:33     ` [PATCH] " Matthieu Moy
2010-08-31 18:44       ` Heiko Voigt
2010-08-23  9:37     ` Matthieu Moy
2010-08-23 13:56       ` Holger Hellmuth
2010-08-23 15:11         ` Clemens Buchacher
2010-08-23 15:57           ` Junio C Hamano
2010-08-24  7:28             ` Clemens Buchacher
2010-08-24 16:19               ` Junio C Hamano
2018-10-16  9:10       ` Ignored files being silently overwritten when switching branches Ævar Arnfjörð Bjarmason
2018-10-16 15:05         ` Duy Nguyen
2018-10-18  1:55           ` Junio C Hamano
2018-11-06 15:12 ` Checkout deleted semi-untracked file Ævar Arnfjörð Bjarmason
2018-11-11  9:52   ` [RFC PATCH] Introduce "precious" file concept Nguyễn Thái Ngọc Duy
2018-11-11 12:15     ` Bert Wesarg
2018-11-11 12:59     ` Junio C Hamano
2018-11-26 19:38     ` [PATCH v2 0/2] Precios files round two Nguyễn Thái Ngọc Duy
2018-11-26 19:38       ` [PATCH v2 1/2] Introduce "precious" file concept Nguyễn Thái Ngọc Duy
2018-11-26 19:38       ` [PATCH v2 2/2] unpack-trees: support core.allIgnoredFilesArePreciousWhenMerging Nguyễn Thái Ngọc Duy
2018-11-11 12:33   ` [RFC PATCH] Introduce "precious" file concept Ævar Arnfjörð Bjarmason
2018-11-11 13:06     ` Ævar Arnfjörð Bjarmason
2018-11-12 16:14       ` Duy Nguyen
2018-11-11 15:41     ` Duy Nguyen
2018-11-11 16:55       ` Ævar Arnfjörð Bjarmason
2018-11-12  7:35       ` Per Lundberg
2018-11-12  9:08         ` Matthieu Moy
2018-11-12  9:49           ` Ævar Arnfjörð Bjarmason [this message]
2018-11-12 10:26             ` Junio C Hamano
2018-11-12 12:45               ` Ævar Arnfjörð Bjarmason
2018-11-12 13:02                 ` Junio C Hamano
2018-11-12 16:07           ` Duy Nguyen
2018-11-12 23:22     ` brian m. carlson
2018-11-26  9:30       ` Per Lundberg
2018-11-26 10:28         ` Ævar Arnfjörð Bjarmason
2018-11-26 12:49         ` Junio C Hamano
2018-11-27 15:08           ` Ævar Arnfjörð Bjarmason
2018-11-28  3:58             ` Junio C Hamano
2018-11-28 21:54               ` Ævar Arnfjörð Bjarmason
2018-11-29  5:04                 ` Junio C Hamano
2018-12-01  6:21                 ` Duy Nguyen
2018-11-26 15:26         ` Duy Nguyen
2018-11-26 15:34           ` Ævar Arnfjörð Bjarmason
2018-11-26 15:40             ` Duy Nguyen
2018-11-26 15:47               ` Ævar Arnfjörð Bjarmason
2018-11-26 15:55                 ` Duy Nguyen
2018-11-27  9:43                   ` Per Lundberg
2018-11-27 12:55                     ` Jacob Keller
2018-11-27 14:50                       ` Per Lundberg
2018-11-28  1:21                         ` brian m. carlson
2018-11-28  6:54                           ` Per Lundberg
2018-11-27 15:19                       ` Duy Nguyen
2018-12-06 18:39                       ` Duy Nguyen
2018-11-26 16:02       ` Eckhard Maaß
2018-10-15 13:01 Ignored files being silently overwritten when switching branches Per Lundberg
2018-10-16  6:40 ` Jeff King
2018-11-06 12:41 Checkout deleted semi-untracked file Steffen Jost

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