piston/lxc/execute

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#!/usr/bin/env bash
dir="$( cd "$( dirname "$0" )" && pwd )"
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touch $dir/lockfile
if [ -z "$1" ]; then
echo "invalid args"
exit
fi
if [ -z "$2" ]; then
echo "invalid args"
exit
fi
lang=$1
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epoch=$(date +%s%N)
basepath="/var/lib/lxc/piston/rootfs"
filepath="/tmp/$epoch/code.code"
argpath="/tmp/$epoch/args.args"
arg=$(basename $argpath)
# write arg file
mkdir -p $basepath/tmp/$epoch
chmod 777 $basepath/tmp/$epoch
cat $2 > $basepath$filepath
echo "${@:3}" > $basepath$argpath
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# process incrementor
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exec 200>$dir/lockfile
flock -x 200
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oldinc=$(cat $dir/i | awk '{$1=$1};1')
newinc=$(expr $oldinc + 1)
if (( newinc >= 151 )); then
newinc=1
echo 1 > $dir/i
else
echo $newinc > $dir/i
fi
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exec 200>&-
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bin=
case "$lang" in
"awk")
bin=awk
;;
"bash")
bin=bash
;;
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"brainfuck" | "bf")
bin=brainfuck
;;
"c")
bin=c
;;
"cpp" | "c++")
bin=cpp
;;
"csharp" | "cs" | "c#")
bin=csharp
;;
"elixir" | "exs")
bin=elixir
;;
"go")
bin=go
;;
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"haskell" | "hs")
bin=haskell
;;
"java")
bin=java
;;
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"jelly")
bin=jelly
;;
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"julia" | "jl")
bin=julia
;;
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"kotlin")
bin=kotlin
;;
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"lua")
bin=lua
;;
"nasm" | "asm")
bin=nasm
;;
"nasm64" | "asm64")
bin=nasm64
;;
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"nim")
bin=nim
;;
"node" | "js" | "javascript")
bin=node
;;
"deno" | "denojs" | "denots")
bin=deno
;;
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"paradoc")
bin=paradoc
;;
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"perl")
bin=perl
;;
"php")
bin=php
;;
"python2")
bin=python2
;;
"python3" | "python")
bin=python3
;;
"ruby")
bin=ruby
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;;
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"rust")
bin=rust
;;
"swift")
bin=swift
;;
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"emacs" | "elisp" | "el")
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bin=emacs
;;
"bash")
bin=bash
;;
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"typescript" | "ts")
bin=typescript
;;
*)
echo "invalid language"
exit
esac
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# runner
timeout -s KILL 10 \
lxc-attach --clear-env -n piston -- \
/bin/bash -l -c "bash /exec/$bin $newinc $epoch 2>&1 | head -c 65536"
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# process janitor
lxc-attach --clear-env -n piston -- \
/bin/bash -l -c "\
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for i in {1..100}; do pkill -u runner$newinc --signal SIGKILL; done ;\
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find /tmp -user runner$newinc -exec /bin/rm -rf {} \;\
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" > /dev/null 2>&1 &
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rm -rf $basepath/tmp/$epoch