From c2904a8e14b09e4c054ff186f1274b89b0f11e25 Mon Sep 17 00:00:00 2001
From: Brian Seymour <imbrianseymour@gmail.com>
Date: Tue, 6 Oct 2020 23:40:14 -0500
Subject: [PATCH] add lua support

---
 api/main.go       |  1 +
 lxc/execute       |  3 +++
 lxc/executors/lua |  2 ++
 lxc/versions      |  3 +++
 readme.md         | 11 +++++++++++
 5 files changed, 20 insertions(+)
 create mode 100644 lxc/executors/lua

diff --git a/api/main.go b/api/main.go
index 3ca388d..21cb1f9 100644
--- a/api/main.go
+++ b/api/main.go
@@ -77,6 +77,7 @@ func Execute(res http.ResponseWriter, req *http.Request) {
         "java",
         "julia", "jl",
         "kotlin",
+        "lua",
         "nasm", "asm",
         "node", "javascript", "js",
         "perl", "pl",
diff --git a/lxc/execute b/lxc/execute
index 248caee..0bca774 100755
--- a/lxc/execute
+++ b/lxc/execute
@@ -75,6 +75,9 @@ case "$lang" in
 "kotlin")
     bin=kotlin
     ;;
+"lua")
+    bin=lua
+    ;;
 "nasm" | "asm")
     bin=nasm
     ;;
diff --git a/lxc/executors/lua b/lxc/executors/lua
new file mode 100644
index 0000000..b412013
--- /dev/null
+++ b/lxc/executors/lua
@@ -0,0 +1,2 @@
+cd /tmp/$2
+runuser runner$1 -c "cd /tmp/$2 ; cat args.args | xargs -d '\n' timeout -s KILL 3 lua code.code"
diff --git a/lxc/versions b/lxc/versions
index f23f467..1e36ea3 100755
--- a/lxc/versions
+++ b/lxc/versions
@@ -33,6 +33,9 @@ echo '---'
 echo 'kotlin'
 lxc-attach --clear-env -n piston -- /bin/bash -l -c "kotlinc -version 2>&1 | grep kotlin"
 echo "---"
+echo 'lua'
+lxc-attach --clear-env -n piston -- /bin/bash -l -c "lua -v"
+echo "---"
 echo 'nasm'
 lxc-attach --clear-env -n piston -- /bin/bash -l -c "nasm -version"
 echo '---'
diff --git a/readme.md b/readme.md
index 0bfb7e4..b3bc4ca 100644
--- a/readme.md
+++ b/readme.md
@@ -207,6 +207,17 @@ make
 echo 'export PATH=$PATH:/opt/emacs/emacs-26.3/src' >> /opt/.profile
 source /opt/.profile
 
+# install lua
+# final binary: /opt/lua/lua54/src/lua
+# get version: /opt/lua/lua54/src/lua -v
+cd /opt && mkdir lua && cd lua
+wget https://sourceforge.net/projects/luabinaries/files/5.4.0/Docs%20and%20Sources/lua-5.4.0_Sources.tar.gz/download
+tar -xzf download
+cd lua54
+make
+echo 'export PATH=$PATH:/opt/lua/lua54/src' >> /opt/.profile
+source /opt/.profile
+
 # create runnable users and apply limits
 for i in {1..150}; do
     useradd -M runner$i