local computer=require("computer")
local fs=require("filesystem")
local info=require("process").info
local event=require("event")

function os.getenv(varname)
local env=info().data.vars
if not varname then
return env
elseif varname=='#'then
return#env
end
return env[varname]
end

function os.setenv(varname,value)
checkArg(1,varname,"string","number")
if value~=nil then
value=tostring(value)
end
info().data.vars[varname]=value
return value
end

function os.sleep(timeout)
checkArg(1,timeout,"number","nil")
local deadline=computer.uptime()+(timeout or 0)
repeat
event.pull(deadline-computer.uptime())
until computer.uptime()>=deadline
end

os.setenv("PATH","/bin:/usr/bin:/home/bin:.")
os.setenv("TMP","/tmp")
os.setenv("TMPDIR","/tmp")

if computer.tmpAddress()then
fs.mount(computer.tmpAddress(),"/tmp")
end

require("package").delay(os,"/lib/core/full_filesystem.lua")