Re: [PATCH 3/3] get_sha1: support relative path ":path" syntax

> Currently :path and ref:path can be used to refer to a specific object
> in index or ref respectively. "path" component is absolute path. This
> patch allows "path" to be written as "./path" or "../path", which is
> relative to user's original cwd.
>
> This does not work in commands for which startup_info is NULL
> (i.e. non-builtin ones, it seems none of them needs this anyway).
>
> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
> ---
>  sha1_name.c                    |   37 ++++++++++++++++++++++--
>  t/t1506-rev-parse-diagnosis.sh |   62 ++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 96 insertions(+), 3 deletions(-)
>
> diff --git a/sha1_name.c b/sha1_name.c
> index 484081d..22c1df9 100644
> --- a/sha1_name.c
> +++ b/sha1_name.c
> @@ -1046,6 +1046,23 @@ int get_sha1_with_mode_1(const char *name, unsigned char *sha1, unsigned *mode,
>        return ret;
>  }
>
> +static char *resolve_relative_path(const char *rel)
> +{
> +       if (prefixcmp(rel, "./") && prefixcmp(rel, "../"))
> +               return NULL;
> +
> +       if (!startup_info)
> +               die("Relative path syntax is not supported in this command. Please report.");