Re: icase pathspec magic support in ls-tree

From: Erik Cervin Edin <erik@cervined.in>
Date: Oct 14, 2022, 08:03 UTC
Message-ID: <CA+JQ7M8s1W68+mzfe__+T5bJ821wYJqfgLBqA1=dSVH9Tx9fHA@mail.gmail.com>
In-Reply-To: <CABPp-BHaMCcLjdx2m4CALZQiTRQy_LovWfbdrga6XWhQJhoxWQ@mail.gmail.com>

Show 7 quoted lines

> I don't imagine I can make a perfectly correct and universal fix to
> this, but with case-insensitive matching on ls-tree in an update hook
> I believe I could reduce the frequency of this already-infrequent
> issue by at least 1000X, which would suit my purposes just fine. In my
> case filenames are mostly ansi-based, and I don't expect we've ever
> had Turkish filenames (turkish "i" being the most famous case-folding
> gotcha I think?).

How about doing it in something that's not ls-tree? Sounds like you already have a script, it just takes a bit too long?

Something similar to

On Fri, Oct 14, 2022 at 6:59 AM Torsten Bögershausen <tboegi@web.de> wrote:

>
> For example, we can use Linux:
>  git ls-files | tr 'A-Z' 'a-z' | sort | uniq -d ; echo $?

In a repo with many files, maybe use git diff --name-only and just run it periodically as a part of a check-in hook or something?

  git diff --name-only HEAD~100..HEAD | tr 'A-Z' 'a-z' | sort | uniq -d

On Fri, Oct 14, 2022 at 9:59 AM Elijah Newren <newren@gmail.com> wrote:

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>
> git diff --diff-filter=A --no-renames --name-only $OLDHASH $NEWHASH |
> sed -e s%/[^/]*$%/% | uniq | xargs git ls-tree --name-only $NEWHASH |
> \
>    sort | uniq -i -d

Or what Elijah just wrote

Show 12 quoted lines

> Coming at this from another angle, I guess we could teach git on
> case-insensitive filesystems to detect this situation (where two files
> in the index, with different contents, are pointing to the exact same
> filesystem file) and more explicitly warn the user of what's wrong,
> giving them clear help on how to fix it? And temporarily exclude those
> two files from its change reconciliation processes altogether to avoid
> ghost changes interfering with recovery actions like "pull"? Certainly
> that would be better than the current "ghost changes" behavior... but
> it would still be far less convenient than preventing (the vast
> majority of) these issues altogether, be that with a custom hook or a
> core option prohibiting clearly case-insensitive-duplicate files from
> being pushed.

That's not to say this isn't a good idea but for now I'd advice an automated scripted route.