Add filesystem abstraction for NetBSD (#1267)

* Add fs abstraction file for NetBSD
* Add init function with verification that the unzip binary is
  available

Co-authored-by: Lawrence Hoffman <lawrence.hoffman@block-g.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/src/luarocks/fs/netbsd.lua b/src/luarocks/fs/netbsd.lua
new file mode 100644
index 00000000..b9610339
--- /dev/null
+++ b/src/luarocks/fs/netbsd.lua
@@ -0,0 +1,14 @@
+--- NetBSD implementation of filesystem and platform abstractions.
+local netbsd = {}
+
+local fs = require("luarocks.fs")
+
+function netbsd.init()
+    local uz=io.open("/usr/bin/unzip", "r")
+    if uz ~= nil then 
+        io.close(uz) 
+        fs.set_tool_available("unzip", true)
+    end
+end
+
+return netbsd