tjh.dev
1#!/usr/bin/env nix-shell
2/*
3#!nix-shell -i node -p nodejs
4*/
5
6import { promises as fs } from 'node:fs';
7
8const constants = {
9 githubUrl: "https://api.github.com/repos/pulsar-edit/pulsar/releases",
10 sha256FileURL: (newVersion) => `https://github.com/pulsar-edit/pulsar/releases/download/v${newVersion}/SHA256SUMS.txt`,
11 x86_64FileName: (newVersion) => `Linux.pulsar-${newVersion}.tar.gz`,
12 aarch64FileName: (newVersion) => `ARM.Linux.pulsar-${newVersion}-arm64.tar.gz`,
13 targetFile: new URL("package.nix", import.meta.url).pathname,
14};
15
16async function utf16ToUtf8(blob) {
17 // Sometime, upstream saves the SHA256SUMS.txt file in UTF-16, which absolutely breaks node's string handling
18 // So we need to convert this blob to UTF-8
19
20 // We need to skip the first 2 bytes, which are the BOM
21 const arrayBuffer = await blob.slice(2).arrayBuffer();
22 const buffer = Buffer.from(arrayBuffer);
23 const utf8String = buffer.toString('utf16le');
24 return utf8String;
25}
26
27async function getLatestVersion() {
28 const requestResult = await fetch(constants.githubUrl);
29 if (!requestResult.ok) {
30 console.error("Failed to fetch releases");
31 console.error(requestResult);
32 process.exit(1);
33 };
34 let jsonResult = await requestResult.json();
35
36 jsonResult = jsonResult.filter((release) => !release.prerelease && !release.draft);
37 if (jsonResult.length == 0) {
38 console.error("No releases found");
39 process.exit(1);
40 }
41
42 return jsonResult[0].tag_name.replace(/^v/, '');
43}
44
45async function getSha256Sum(hashFileContent, targetFile) {
46 // The upstream file has a fomat like this:
47 // 0000000000000000000000000000000000000000000000000000000000000000 targetFile
48
49 let sha256 = hashFileContent.
50 split('\n').
51 map(line => line.replace("\r", "")). // Side-effect of the UTF-16 conversion, if the file was created from Windows
52 filter((line) => line.endsWith(targetFile))[0].
53 split(' ')[0];
54
55 return "sha256-" + Buffer.from(sha256, 'hex').toString('base64');
56}
57
58async function getSha256Sums(newVersion) {
59 // Upstream provides a file with the hashes of the files, but it's not in the SRI format, and it refers to the compressed tarball
60 // So let's just use nix-prefetch-url to get the hashes of the decompressed tarball, and `nix hash to-sri` to convert them to SRI format
61 const hashFileUrl = constants.sha256FileURL(newVersion);
62 const hashFileContent = await fetch(hashFileUrl).then((response) => response.blob());
63 const headerbuffer = await hashFileContent.slice(0, 2).arrayBuffer()
64 const header = Buffer.from(headerbuffer).toString('hex');
65
66 // We must detect if it's UTF-16 or UTF-8. If it's UTF-16, we must convert it to UTF-8, otherwise just use it as-is
67 const hashFileContentString = header == 'fffe' ?
68 await utf16ToUtf8(hashFileContent) :
69 await hashFileContent.text();
70
71 let x86_64;
72 let aarch64;
73 console.log("Getting new hashes");
74 let promises = [
75 getSha256Sum(hashFileContentString, constants.x86_64FileName(newVersion)).then((hash) => { x86_64 = hash; }),
76 getSha256Sum(hashFileContentString, constants.aarch64FileName(newVersion)).then((hash) => { aarch64 = hash; }),
77 ];
78 await Promise.all(promises);
79 return { x86_64, aarch64 };
80}
81
82async function updateFile(newVersion, sha256Sums, currentFile) {
83 // There is some assumptions in how the file is formatted, but nothing egregious
84
85 let newFile = currentFile.replace(/version = "(.*)";/, `version = "${newVersion}";`);
86 newFile = newFile.replace(/x86_64-linux\.hash = "(.*)";/, `x86_64-linux.hash = "${sha256Sums.x86_64}";`);
87 newFile = newFile.replace(/aarch64-linux\.hash = "(.*)";/, `aarch64-linux.hash = "${sha256Sums.aarch64}";`);
88
89 await fs.writeFile(constants.targetFile, newFile);
90};
91
92let currentFile = await fs.readFile(constants.targetFile, 'utf8');
93let currentVersion = currentFile.match(/version = "(.*)";/)[1];
94const newVersion = await getLatestVersion();
95if (currentVersion === newVersion) {
96 console.error("Already up to date");
97 process.exit(0);
98}
99console.log("New version: " + newVersion);
100const sha256Sums = await getSha256Sums(newVersion);
101console.log(sha256Sums)
102if (!sha256Sums.x86_64 || !sha256Sums.aarch64) {
103 console.error("Failed to find sha256 sums for the 2 files");
104 process.exit(1);
105}
106updateFile(newVersion, sha256Sums, currentFile);