local shell = require("shell")
local package = require("package")
local component = require("component")
local filesystem = require("filesystem")


local FROM = _ENV.install.from
local exists = filesystem.exists

--init path
local oldPackagePath = package.path
package.path = table.concat({oldPackagePath, string.format("%s/lib/?.lua", FROM)}, ";")


--install
if (exists(FROM .. "libtar.tar") and exists(FROM .. "pm.tar")) then
    shell.execute(FROM .. "bin/pm install --allow-same-version " .. FROM .. "libtar.tar")
    shell.execute(FROM .. "bin/pm install --allow-same-version " .. FROM .. "pm.tar")
end
if (component.isAvailable("internet")) then
    shell.execute(FROM .. "bin/pm install --allow-same-version " .. FROM .. "pm_get.tar")
    shell.execute("pm-get update")
    shell.execute("pm-get upgrade")
end

--reset path
package.path = oldPackagePath