embed git commit info in nodeinfo&c

this will make it much easier to debug problems for instances that run
unreleased versions!

when run on a tagged commit, `git describe --tags` prints the tag name;
otherwise it prints something like `2025.4.3-32-ga4c0ef824c` which
means:

- the closest tag is 2025.4.3
- there are 32 commits between that tag and this commit
- this commit's id is `a4c0ef824c` (the `g` is just a prefix)

notice that the version as reported by the frontend (in
`/about-sharkey` for example) is _not_ changed, that one is still
sourced from `/package.json` (so, for example, you don't get a
"sharkey has been updated!" pop-up every time)

packages/backend/src/boot/master.ts

@@ -51,7 +51,7 @@ function greet() {
 	}
 
 	bootLogger.info('Welcome to Sharkey!');
-	bootLogger.info(`Sharkey v${meta.version}`, null, true);
+	bootLogger.info(`Sharkey v${meta.gitVersion ?? meta.version}`, null, true);
 }
 
 /**
@@ -91,7 +91,7 @@ export async function masterMain() {
 			maxBreadcrumbs: 0,
 
 			// Set release version
-			release: 'Sharkey@' + meta.version,
+			release: 'Sharkey@' + (meta.gitVersion ?? meta.version),
 
 			...config.sentryForBackend.options,
 		});

packages/backend/src/boot/worker.ts

@@ -37,7 +37,7 @@ export async function workerMain() {
 			maxBreadcrumbs: 0,
 
 			// Set release version
-			release: "Sharkey@" + meta.version,
+			release: "Sharkey@" + (meta.gitVersion ?? meta.version),
 
 			...config.sentryForBackend.options,
 		});

packages/backend/src/config.ts

@@ -397,7 +397,7 @@ export function loadConfig(): Config {
 	applyEnvOverrides(config);
 
 	const url = tryCreateUrl(config.url ?? process.env.MISSKEY_URL ?? '');
-	const version = meta.version;
+	const version = meta.gitVersion ?? meta.version;
 	const host = url.host;
 	const hostname = url.hostname;
 	const scheme = url.protocol.replace(/:$/, '');

scripts/build-pre.js

@@ -5,13 +5,24 @@
 
 const fs = require('fs');
 const packageJsonPath = __dirname + '/../package.json'
+const { execFileSync } = require('node:child_process');
 
 function build() {
+	let gitVersion;
+	try {
+		gitVersion = execFileSync('git', ['describe', '--tags'], {
+			encoding: 'utf-8',
+		});
+		gitVersion = gitVersion.trim();
+	} catch (e) {
+		console.warn("couldn't get git commit details, ignoring",e);
+	}
+
 	try {
 		const json = fs.readFileSync(packageJsonPath, 'utf-8')
 		const meta = JSON.parse(json);
 		fs.mkdirSync(__dirname + '/../built', { recursive: true });
-		fs.writeFileSync(__dirname + '/../built/meta.json', JSON.stringify({ version: meta.version }), 'utf-8');
+		fs.writeFileSync(__dirname + '/../built/meta.json', JSON.stringify({ version: meta.version, gitVersion }), 'utf-8');
 	} catch (e) {
 		console.error(e)
 	}