fix: save store paths to file (#5)

closes #4

src/stages/configure.ts

@@ -1,6 +1,6 @@
 import * as core from "@actions/core";
 import { exec } from "@actions/exec";
-import { getStorePaths } from "../utils";
+import { saveStorePaths } from "../utils";
 
 export const configure = async () => {
 	core.startGroup("Configure attic");
@@ -14,8 +14,7 @@ export const configure = async () => {
 		await exec("attic", ["login", "--set-default", cache, endpoint, token]);
 
 		core.info("Collecting store paths before build");
-		const paths = await getStorePaths();
-		core.saveState("initial-paths", JSON.stringify(paths));
+		await saveStorePaths();
 	} catch (e) {
 		core.setFailed(`Action failed with error: ${e}`);
 	}

src/stages/push.ts

@@ -2,8 +2,7 @@ import * as core from "@actions/core";
 import { exec } from "@actions/exec";
 
 import splitArray from "just-split";
-import { getStorePaths } from "../utils";
-
+import { saveStorePaths, getStorePaths } from "../utils";
 export const push = async () => {
 	core.startGroup("Push to Attic");
 
@@ -15,7 +14,8 @@ export const push = async () => {
 			const cache = core.getInput("cache");
 
 			core.info("Pushing to cache");
-			const oldPaths = JSON.parse(core.getState("initial-paths")) as string[];
+			const oldPaths = await getStorePaths();
+			await saveStorePaths();
 			const newPaths = await getStorePaths();
 			const addedPaths = newPaths
 				.filter((p) => !oldPaths.includes(p))

src/utils.ts

@@ -1,23 +1,10 @@
 import { exec } from "@actions/exec";
-import { Writable } from "node:stream";
 
-class StringStream extends Writable {
-	chunks: Buffer[] = [];
-
-	_write(chunk: WithImplicitCoercion<ArrayBuffer | SharedArrayBuffer>, _enc: unknown, next: () => unknown) {
-		this.chunks.push(Buffer.from(chunk));
-		next();
-	}
-
-	string() {
-		return Buffer.concat(this.chunks).toString("utf-8");
-	}
-}
+import { readFile } from "node:fs/promises";
 
+export const saveStorePaths = async () => {
+	await exec("sh", ["-c", "nix  path-info --all --json > /tmp/store-paths"]);
+};
 export const getStorePaths = async () => {
-	const outStream = new StringStream();
-	await exec("nix", ["path-info", "--all"], { outStream });
-	const paths = outStream.string().split("\n").filter(Boolean);
-
-	return paths;
+	return JSON.parse(await readFile("/tmp/store-paths", "utf8")).map((path) => path.path);
 };