From: Junio C Hamano <gitster@pobox.com>
To: Jeff King <peff@peff.net>
Cc: git@vger.kernel.org, Michael Haggerty <mhagger@alum.mit.edu>
Subject: Re: [PATCH 0/17] removing questionable uses of git_path
Date: Mon, 10 Aug 2015 10:31:32 -0700 [thread overview]
Message-ID: <xmqqr3nbuk23.fsf@gitster.dls.corp.google.com> (raw)
In-Reply-To: <20150810092731.GA9027@sigill.intra.peff.net> (Jeff King's message of "Mon, 10 Aug 2015 05:27:32 -0400")
Jeff King <peff@peff.net> writes:
> The problem is that git_path uses a static buffer that gets overwritten
> by subsequent calls.
As the rotating static buffer pattern used in get_pathname() was
modeled after sha1_to_hex(), we have the same issue there. They are
troubles waiting to happen unless the callers are careful.
> producing a fairly tame-looking set of function calls. It's OK to pass
> the result of git_path() to a system call, or something that is a thin
> wrapper around one (e.g., strbuf_read_file).
That is a short and good rule to follow, but the problem is that not
everybody has good taste to interpret the above rule and apply it with
an eye toward maintainability X-<.
> Along the way, there are a few cleanups (e.g., I polished off the recent
> hold_lock_file_for_append topic which was on the list, as it had some
> problematic calls).
>
> [01/17]: cache.h: clarify documentation for git_path, et al
> [02/17]: cache.h: complete set of git_path_submodule helpers
> [03/17]: t5700: modernize style
> [04/17]: add_to_alternates_file: don't add duplicate entries
> [05/17]: remove hold_lock_file_for_append
> [06/17]: prefer git_pathdup to git_path in some possibly-dangerous cases
> [07/17]: prefer mkpathdup to mkpath in assignments
> [08/17]: remote.c: drop extraneous local variable from migrate_file
> [09/17]: refs.c: remove extra git_path calls from read_loose refs
> [10/17]: path.c: drop git_path_submodule
> [11/17]: refs.c: simplify strbufs in reflog setup and writing
> [12/17]: refs.c: avoid repeated git_path calls in rename_tmp_log
> [13/17]: refs.c: avoid git_path assignment in lock_ref_sha1_basic
> [14/17]: refs.c: remove_empty_directories can take a strbuf
> [15/17]: find_hook: keep our own static buffer
> [16/17]: get_repo_path: refactor path-allocation
> [17/17]: memoize common git-path "constant" files
Nice. Thanks.
next prev parent reply other threads:[~2015-08-10 17:31 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-10 9:27 [PATCH 0/17] removing questionable uses of git_path Jeff King
2015-08-10 9:32 ` [PATCH 01/17] cache.h: clarify documentation for git_path, et al Jeff King
2015-08-10 9:32 ` [PATCH 02/17] cache.h: complete set of git_path_submodule helpers Jeff King
2015-08-10 9:32 ` [PATCH 03/17] t5700: modernize style Jeff King
2015-08-10 9:34 ` [PATCH 04/17] add_to_alternates_file: don't add duplicate entries Jeff King
2015-08-11 4:00 ` Michael Haggerty
2015-08-11 9:54 ` Jeff King
2015-08-10 9:35 ` [PATCH 05/17] remove hold_lock_file_for_append Jeff King
2015-08-10 22:36 ` Junio C Hamano
2015-08-11 9:38 ` Jeff King
2015-08-10 9:35 ` [PATCH 06/17] prefer git_pathdup to git_path in some possibly-dangerous cases Jeff King
2015-08-10 9:35 ` [PATCH 07/17] prefer mkpathdup to mkpath in assignments Jeff King
2015-08-10 9:35 ` [PATCH 08/17] remote.c: drop extraneous local variable from migrate_file Jeff King
2015-08-10 9:36 ` [PATCH 09/17] refs.c: remove extra git_path calls from read_loose_refs Jeff King
2015-08-10 9:36 ` [PATCH 10/17] path.c: drop git_path_submodule Jeff King
2015-08-10 22:50 ` Junio C Hamano
2015-08-10 22:57 ` Junio C Hamano
2015-08-10 23:52 ` Junio C Hamano
2015-08-11 9:53 ` Jeff King
2015-08-10 9:36 ` [PATCH 11/17] refs.c: simplify strbufs in reflog setup and writing Jeff King
2015-08-10 10:34 ` Michael Haggerty
2015-08-10 12:26 ` Jeff King
2015-08-10 9:36 ` [PATCH 12/17] refs.c: avoid repeated git_path calls in rename_tmp_log Jeff King
2015-08-10 9:37 ` [PATCH 13/17] refs.c: avoid git_path assignment in lock_ref_sha1_basic Jeff King
2015-08-10 9:37 ` [PATCH 14/17] refs.c: remove_empty_directories can take a strbuf Jeff King
2015-08-10 9:37 ` [PATCH 15/17] find_hook: keep our own static buffer Jeff King
2015-08-10 9:37 ` [PATCH 16/17] get_repo_path: refactor path-allocation Jeff King
2015-08-10 9:38 ` [PATCH 17/17] memoize common git-path "constant" files Jeff King
2015-08-10 12:05 ` Michael Haggerty
2015-08-10 12:30 ` Jeff King
2015-08-10 12:06 ` [PATCH 0/17] removing questionable uses of git_path Michael Haggerty
2015-08-10 17:31 ` Junio C Hamano [this message]
2015-08-10 17:47 ` Jeff King
2015-08-15 9:05 ` Duy Nguyen
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