99 lines
2.6 KiB
Lua
99 lines
2.6 KiB
Lua
local repoRoot = "https://git.colon-three.com/kodi/snowier/raw/branch/main/"
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local URLs = {
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fileIndex = repoRoot .. "index.json",
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sha256 = repoRoot .. "sha256.lua"
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}
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local log = {}
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--- @param value string
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function log.info(value)
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print("[I] " .. value)
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end
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--- @param value string
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function log.debug(value)
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print("[D] " .. value)
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end
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--- @param value string
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function log.error(value)
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printError("[E] " .. value)
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end
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local function main()
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log.info("Starting installer")
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if not fs.exists("sha256.lua") then
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log.info("Downloading sha256.lua")
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local sharequest = http.get(URLs.sha256)
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local shafile = fs.open("sha256.lua", "w")
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shafile.write(sharequest.readAll())
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shafile.close()
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sharequest.close()
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end
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package.path = package.path .. ";/?;/?.lua" -- hack to solve 'wget run'
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local hash = require("sha256")
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log.info("Downloading index file")
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local indexrequest = http.get(URLs.fileIndex)
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local index = textutils.unserializeJSON(indexrequest.readAll())
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indexrequest.close()
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if (index == nil) then
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log.error("Failed to deserialize index file.")
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return
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end
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log.info("Checking for updates")
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local toDownload = {}
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for k, v in ipairs(index) do
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-- A file should be redownloaded if it either:
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-- - Doesn't exist locally
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-- - Exists locally but has a different hash
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if not fs.exists(v.dest) then
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toDownload[#toDownload+1] = v
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else
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local destfile = fs.open(v.dest, "r")
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local filehash = hash.sha256(destfile.readAll())
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destfile.close()
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if filehash ~= v.sha256 then
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toDownload[#toDownload+1] = v
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end
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end
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end
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log.info(#toDownload .. " files to download")
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for k, v in ipairs(toDownload) do
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if not fs.exists("/tmp") then
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fs.makeDir("/tmp")
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end
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log.info("Downloading '" .. v.dest .. "'")
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local filerequest = http.get(repoRoot .. v.src)
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local tempfile = fs.open("/tmp/" .. v.hash .. ".lua", "w")
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tempfile.write(filerequest.readAll())
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filerequest.close()
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tempfile.close()
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-- Check the validity of the hash, this acts both as a checksum
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-- and a way to raise an error if the index is incorrect
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tempfile = fs.open("/tmp/" .. v.hash .. ".lua", "r")
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local filehash = hash.sha256(tempfile.readAll())
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tempfile.close()
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if filehash ~= v.hash then
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log.error("File " .. v.dest .. " (from " .. v.src .. ") has a mismatched hash.")
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log.error("Installation aborted.")
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return
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end
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end
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log.info("Installing")
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for k, v in ipairs(toDownload) do
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fs.move("/tmp/" .. v.hash .. ".lua", v.dest)
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end
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log.info("Installation complete!")
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end
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main()
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