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 <redacted>
---
 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.");