From c68c5e30a7acaeb3fbb46152c09f683c337456ad Mon Sep 17 00:00:00 2001
From: Federico Capoano <nemesis@ninux.org>
Date: Fri, 27 May 2016 17:08:22 +0200
Subject: [PATCH] [utils] Added file_exists + test #19

---
 openwisp-config/files/lib/openwisp/utils.lua | 7 +++++++
 openwisp-config/tests/test_utils.lua         | 5 +++++
 2 files changed, 12 insertions(+)

diff --git a/openwisp-config/files/lib/openwisp/utils.lua b/openwisp-config/files/lib/openwisp/utils.lua
index c22b411..5d336e8 100644
--- a/openwisp-config/files/lib/openwisp/utils.lua
+++ b/openwisp-config/files/lib/openwisp/utils.lua
@@ -1,4 +1,5 @@
 -- openwisp uci utils
+require('io')
 require('lfs')
 
 function starts_with_dot(str)
@@ -127,3 +128,9 @@ function dirtree(dir)
     end
     return coroutine.wrap(function() yieldtree(dir) end)
 end
+
+function file_exists(path)
+    local f = io.open(path, 'r')
+    if f ~= nil then io.close(f) return true end
+    return false
+end
diff --git a/openwisp-config/tests/test_utils.lua b/openwisp-config/tests/test_utils.lua
index 4e0e613..d38732f 100644
--- a/openwisp-config/tests/test_utils.lua
+++ b/openwisp-config/tests/test_utils.lua
@@ -242,4 +242,9 @@ function TestUtils.test_dirtree()
     luaunit.assertEquals(count, 4)
 end
 
+function TestUtils.test_file_exists()
+    luaunit.assertEquals(file_exists('./test_utils.lua'), true)
+    luaunit.assertEquals(file_exists('./WRONG'), false)
+end
+
 os.exit(luaunit.LuaUnit.run())