From: Jeff King <peff@peff.net>
To: git@vger.kernel.org
Cc: Michael Haggerty <mhagger@alum.mit.edu>
Subject: [PATCH 15/17] find_hook: keep our own static buffer
Date: Mon, 10 Aug 2015 05:37:45 -0400 [thread overview]
Message-ID: <20150810093744.GO30981@sigill.intra.peff.net> (raw)
In-Reply-To: <20150810092731.GA9027@sigill.intra.peff.net>
The find_hook function returns the results of git_path,
which is a static buffer shared by other path-related calls.
Returning such a buffer is slightly dangerous, because it
can be overwritten by seemingly unrelated functions.
Let's at least keep our _own_ static buffer, so you can
only get in trouble by calling find_hook in quick
succession, which is less likely to happen and more obvious
to notice.
While we're at it, let's add some documentation of the
function's limitations.
Signed-off-by: Jeff King <peff@peff.net>
---
run-command.c | 10 ++++++----
run-command.h | 5 +++++
2 files changed, 11 insertions(+), 4 deletions(-)
diff --git a/run-command.c b/run-command.c
index 4d73e90..28e1d55 100644
--- a/run-command.c
+++ b/run-command.c
@@ -797,11 +797,13 @@ int finish_async(struct async *async)
const char *find_hook(const char *name)
{
- const char *path = git_path("hooks/%s", name);
- if (access(path, X_OK) < 0)
- path = NULL;
+ static struct strbuf path = STRBUF_INIT;
- return path;
+ strbuf_reset(&path);
+ strbuf_git_path(&path, "hooks/%s", name);
+ if (access(path.buf, X_OK) < 0)
+ return NULL;
+ return path.buf;
}
int run_hook_ve(const char *const *env, const char *name, va_list args)
diff --git a/run-command.h b/run-command.h
index 1103805..5b4425a 100644
--- a/run-command.h
+++ b/run-command.h
@@ -52,6 +52,11 @@ int start_command(struct child_process *);
int finish_command(struct child_process *);
int run_command(struct child_process *);
+/*
+ * Returns the path to the hook file, or NULL if the hook is missing
+ * or disabled. Note that this points to static storage that will be
+ * overwritten by further calls to find_hook and run_hook_*.
+ */
extern const char *find_hook(const char *name);
LAST_ARG_MUST_BE_NULL
extern int run_hook_le(const char *const *env, const char *name, ...);
--
2.5.0.414.g670f2a4
next prev parent reply other threads:[~2015-08-10 9:37 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 ` Jeff King [this message]
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
2015-08-10 17:47 ` Jeff King
2015-08-15 9:05 ` Duy Nguyen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: http://vger.kernel.org/majordomo-info.html
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20150810093744.GO30981@sigill.intra.peff.net \
--to=peff@peff.net \
--cc=git@vger.kernel.org \
--cc=mhagger@alum.mit.edu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://80x24.org/mirrors/git.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).