From 5cbc1470b9fc00f9d82e118cdd40304eddf5eee2 Mon Sep 17 00:00:00 2001
From: Leonardo de Moura <leonardo@microsoft.com>
Date: Mon, 21 Aug 2017 20:20:13 +0200
Subject: [PATCH] chore(bin/leanpkg): return nicer error message if `greadlink`
 is not available on OSX

see issue #1788
---
 bin/leanpkg | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/bin/leanpkg b/bin/leanpkg
index 929bbf706d..1ef27e4477 100755
--- a/bin/leanpkg
+++ b/bin/leanpkg
@@ -1,7 +1,15 @@
 #!/usr/bin/env bash
-if command -v greadlink >/dev/null 2>&1; then
-    # macOS readlink doesn't support -f option
-    READLINK=greadlink
+
+unamestr=`uname`
+if [[ "$unamestr" == 'Darwin' ]]; then
+    # OSX
+    if command -v greadlink >/dev/null 2>&1; then
+        # macOS readlink doesn't support -f option
+        READLINK=greadlink
+    else
+        echo "OSX 'readlink' command does not support option '-f', please install 'greadlink'. If you use 'brew', you can install 'greadlink' using 'brew install coreutils'"
+        exit 1
+    fi
 else
     READLINK=readlink
 fi