linux-kernel - Re: [PATCH] apply: refuse touching a file beyond symlink

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Message-ID: <xmqqwq44auml.fsf@gitster.dls.corp.google.com>
Date:	Fri, 30 Jan 2015 12:20:02 -0800
From:	Junio C Hamano <gitster@...ox.com>
To:	Jeff King <peff@...f.net>
Cc:	Git Mailing List <git@...r.kernel.org>,
	Josh Boyer <jwboyer@...oraproject.org>,
	"Linux-Kernel\@Vger. Kernel. Org" <linux-kernel@...r.kernel.org>,
	twaugh@...hat.com, Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] apply: refuse touching a file beyond symlink

Jeff King <peff@...f.net> writes:

> I had the impression that we did not apply in any arbitrary order that
> could work, but rather that we did deletions first followed by
> additions. But I am fairly ignorant of the apply code.

No, you are thinking about the write-out of the finished result,
which may have to turn existing directory to a file or vice versa on
the filesystem, but that happens _after_ we decide what to turn into
what else, completely in-core.

And the decision to determine what the input _means_ should not
depend on the order of patches in the input.
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