Re: [PATCH] setup: translate symlinks in filename when using absolute paths

[Junio C Hamano <gitster@pobox.com>]

Carlo Marcelo Arenas Belon <carenas@sajinet.com.pe> writes:

> otherwise, comparison to validate against work tree will fail when
> the path includes a symlink and the name passed is not canonical.
>
> Signed-off-by: Carlo Marcelo Arenas Belon <carenas@sajinet.com.pe>

I take that "path" and "name passed" refer to the same thing (i.e. "path"
parameter) in the above.

I think you are trying to handle the case where:

 - you give "/home/carenas/one" from the command line;
 - $PWD is "/home/carenas"; and
 - "/home/carenas" is a symlink to "/net/host/home/carenas"

and the scan-from-the-beginning-of-string check done between
"/home/carenas/one" and the return value of get_git_work_tree() which
presumably is "/net/host/home/carenas" disagrees.  I wonder if a more
correct solution might be to help get_git_work_tree() to match the notion
of where the repository and its worktree are to the idea of where the user
thinks they are, i.e. not "/net/host/home/carenas" but "/home/carenas", a
bit better?

That would involve tweaking make_absolute_path() I guess?

Note that your patch is the right thing to do either case, i.e. with or
without such a change to make_absolute_path(), as the function is used to
set up the return value from get_git_work_tree().  Anything we compare
with it should have passed make_absolute_path() at least once.

Nguyễn?

> ---
>  setup.c |   11 +++++++----
>  1 files changed, 7 insertions(+), 4 deletions(-)
>
> diff --git a/setup.c b/setup.c
> index 91887a4..e7c0d4d 100644
> --- a/setup.c
> +++ b/setup.c
> @@ -7,10 +7,13 @@ static int inside_work_tree = -1;
>  char *prefix_path(const char *prefix, int len, const char *path)
>  {
>  	const char *orig = path;
> -	char *sanitized = xmalloc(len + strlen(path) + 1);
> -	if (is_absolute_path(orig))
> -		strcpy(sanitized, path);
> -	else {
> +	char *sanitized;
> +	if (is_absolute_path(orig)) {
> +		const char *temp = make_absolute_path(path);
> +		sanitized = xmalloc(len + strlen(temp) + 1);
> +		strcpy(sanitized, temp);
> +	} else {
> +		sanitized = xmalloc(len + strlen(path) + 1);
>  		if (len)
>  			memcpy(sanitized, prefix, len);
>  		strcpy(sanitized + len, path);
> -- 
> 1.7.3.4.626.g73e7b.dirty