linux-kernel - Re: diffutils file mode (was Re: [PATCH 5.15 00/37] 5.15.96-rc2 review)

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Date:   Fri, 24 Feb 2023 11:32:47 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Paul Eggert <eggert@...ucla.edu>,
        Jim Meyering <meyering@...com>,
        Nathan Chancellor <nathan@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>,
        stable <stable@...r.kernel.org>, patches@...ts.linux.dev,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        shuah@...nel.org, patches@...nelci.org,
        lkft-triage@...ts.linaro.org, Pavel Machek <pavel@...x.de>,
        Jon Hunter <jonathanh@...dia.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        srw@...dewatkins.net, rwarsow@....de
Subject: Re: diffutils file mode (was Re: [PATCH 5.15 00/37] 5.15.96-rc2
 review)

On Fri, 24 Feb 2023 11:16:52 -0800 Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> But as far as I can tell, GNU diffutils have never actually grown the
> ability to generate those extensions, even though at least the mode
> bit one should be fairly simple (the file rename/copy ones are rather
> more complicated, but those are just a "make diffs more legible and
> compact" convenience thing, unlike the executable bit thing that
> allows for scripts to remain executable).

yeah, irritating.

Can we use git instead of diff?  I tried once, but it didn't work -
perhaps because it didn't like doing stuff outside a git repo.

However, trying it now...

hp2:/home/akpm> mkdir foo
hp2:/home/akpm> cd foo
hp2:/home/akpm/foo> date > a
hp2:/home/akpm/foo> cp a b
hp2:/home/akpm/foo> chmod +x a
hp2:/home/akpm/foo> git diff a b
diff --git a/a b/b              
old mode 100755
new mode 100644