From 4eb27bea022c1bcd816561d2e8e64d67aef62b18 Mon Sep 17 00:00:00 2001
From: daurnimator <quae@daurnimator.com>
Date: Tue, 14 Aug 2018 12:44:40 +1000
Subject: fs/unix/tools: Throw error if umask output is invalid

---
 src/luarocks/fs/unix/tools.lua | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src')

diff --git a/src/luarocks/fs/unix/tools.lua b/src/luarocks/fs/unix/tools.lua
index 31d8f0ca..f99582bd 100644
--- a/src/luarocks/fs/unix/tools.lua
+++ b/src/luarocks/fs/unix/tools.lua
@@ -214,6 +214,9 @@ do
       local umask = assert(fd:read("*a"))
       fd:close()
       local u, g, o = umask:match("u=([rwx]*),g=([rwx]*),o=([rwx]*)")
+      if not u then
+         error("invalid umask result")
+      end
       umask_cache = string.format("%d%d%d",
          7 - rwx_to_octal(u),
          7 - rwx_to_octal(g),
-- 
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