From 3290f935120a3afb96ba3c7cd5e2e7af4e1b4a30 Mon Sep 17 00:00:00 2001
From: Min RK <benjaminrk@gmail.com>
Date: Thu, 30 Nov 2017 12:33:46 +0100
Subject: [PATCH] fix cd to python dir in freeze.bash

- cd was missing, instead the directory was being printed
- readlink doesn't exist on BSD
---
 repo2docker/buildpacks/python/freeze.bash | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/repo2docker/buildpacks/python/freeze.bash b/repo2docker/buildpacks/python/freeze.bash
index e1ebb40d..bb614326 100755
--- a/repo2docker/buildpacks/python/freeze.bash
+++ b/repo2docker/buildpacks/python/freeze.bash
@@ -5,7 +5,14 @@ set -euo pipefail
 # Does the same for requirements2.txt to requirements2.frozen.txt...
 
 # cd to the directory where the freeze script is located
-dirname "$(readlink -f "$0")"
+if [[ ! -z "$(which realpath 2>/dev/null)" ]]; then
+    realpath=realpath
+else
+    realpath="readlink -f"
+fi
+
+cd $(dirname "$($realpath "$0")")
+
 
 function freeze-requirements {
     # Freeze a requirements file $2 into a frozen requirements file $3