Subject: Re: [PATCH v5 0/5] road to reentrant real_path

From: Brandon Williams <[email-masked]>
Date: Mon, 9 Jan 2017 10:04:18 -0800

On 01/07, Junio C Hamano wrote:
> Brandon Williams <[email-masked]> writes:
> 
> > changes in v5:
> > * set errno to ELOOP when MAXSYMLINKS is exceded.
> > * revert to use MAXSYMLINKS instead of MAXDEPTH.
> > * If the OS hasn't defined MAXSYMLINKS, use a fallback value of 32.
> >
> > Brandon Williams (4):
> >   real_path: resolve symlinks by hand
> >   real_path: convert real_path_internal to strbuf_realpath
> >   real_path: create real_pathdup
> >   real_path: have callers use real_pathdup and strbuf_realpath
> >
> > Johannes Sixt (1):
> >   real_path: canonicalize directory separators in root parts
> >
> 
> How does this relate to the 5-patch real_path: series that has been
> on 'next' since last year?

The only difference should be in the first patch of the series which
handles the #define a bit differently due to the discussion that
happened last week.

Here is the interdiff between v5 and 'origin/bw/realpath-wo-chdir':

diff --git a/abspath.c b/abspath.c
index 1d56f5ed9..fce40fddc 100644
--- a/abspath.c
+++ b/abspath.c
@@ -62,7 +62,9 @@ static void get_root_part(struct strbuf *resolved, struct strbuf *remaining)
 }
 
 /* We allow "recursive" symbolic links. Only within reason, though. */
-#define MAXSYMLINKS 5
+#ifndef MAXSYMLINKS
+#define MAXSYMLINKS 32
+#endif
 
 /*
  * Return the real path (i.e., absolute path, with symlinks resolved
@@ -139,6 +141,8 @@ char *strbuf_realpath(struct strbuf *resolved, const char *path,
 			strbuf_reset(&symlink);
 
 			if (num_symlinks++ > MAXSYMLINKS) {
+				errno = ELOOP;
+
 				if (die_on_error)
 					die("More than %d nested symlinks "
 					    "on path '%s'", MAXSYMLINKS, path);

-- 
Brandon Williams