From 2599602d5847abb9e5d89d27b028ca6040aa6cfb Mon Sep 17 00:00:00 2001
From: Nulo <git@nulo.in>
Date: Wed, 31 May 2023 11:18:11 -0300
Subject: [PATCH] rootfs en js

---
 build-rootfs.sh       |  57 -------------------
 rootfs/.npmrc         |   1 +
 rootfs/build.js       | 126 ++++++++++++++++++++++++++++++++++++++++++
 rootfs/package.json   |  20 +++++++
 rootfs/pnpm-lock.yaml |  19 +++++++
 rootfs/tsconfig.json  |   8 +++
 6 files changed, 174 insertions(+), 57 deletions(-)
 delete mode 100755 build-rootfs.sh
 create mode 100644 rootfs/.npmrc
 create mode 100644 rootfs/build.js
 create mode 100644 rootfs/package.json
 create mode 100644 rootfs/pnpm-lock.yaml
 create mode 100644 rootfs/tsconfig.json

diff --git a/build-rootfs.sh b/build-rootfs.sh
deleted file mode 100755
index a1ae6ba..0000000
--- a/build-rootfs.sh
+++ /dev/null
@@ -1,57 +0,0 @@
-#!/bin/sh -xe
-# https://github.com/firecracker-microvm/firecracker/blob/main/docs/rootfs-and-kernel-setup.md
-
-dir="$(mktemp --tmpdir -d tmp.fireactions-rootfs.XXXXXXXXXX)"
-podman run -it --rm -v "$dir:/rootfs:Z" docker.io/alpine:3.18 sh -c "
-mkdir -p /rootfs/etc/apk
-cp -r /etc/apk/keys /rootfs/etc/apk/
-echo https://dl-cdn.alpinelinux.org/alpine/v3.18/main >> /rootfs/etc/apk/repositories
-echo https://dl-cdn.alpinelinux.org/alpine/v3.18/community >> /rootfs/etc/apk/repositories
-apk add --initdb --root /rootfs alpine-base dropbear util-linux dropbear-dbclient dhcpcd
-"
-
-# gotta go fast
-echo 'rc_parallel="YES"' >> "$dir"/etc/rc.conf
-
-mkdir -p "$dir"/usr/local/sbin
-go build -tags=netgo -o "$dir"/usr/local/sbin/fireactions-agent ./agent
-# https://github.com/OpenRC/openrc/blob/master/service-script-guide.md
-echo "#!/sbin/openrc-run
-pidfile=\"/run/\${RC_SVCNAME}.pid\"
-command_background=true
-command=/usr/local/sbin/fireactions-agent" > "$dir"/etc/init.d/fireactions-agent
-chmod +x "$dir"/etc/init.d/fireactions-agent
-ln -s /etc/init.d/fireactions-agent "$dir"/etc/runlevels/default/
-
-ln -s /etc/init.d/devfs "$dir"/etc/runlevels/boot/
-ln -s /etc/init.d/procfs "$dir"/etc/runlevels/boot/
-ln -s /etc/init.d/sysfs "$dir"/etc/runlevels/boot/
-ln -s /etc/init.d/networking "$dir"/etc/runlevels/default/
-# ln -s /etc/init.d/dhcpcd "$dir"/etc/runlevels/default/
-ln -s /etc/init.d/dropbear "$dir"/etc/runlevels/default/
-
-echo ttyS0 > "$dir"/etc/securetty
-ln -s agetty "$dir"/etc/init.d/agetty.ttyS0
-ln -s /etc/init.d/agetty.ttyS0 "$dir"/etc/runlevels/default/
-# ln -s /etc/init.d/local "$dir"/etc/runlevels/default/
-
-mkdir -p "$dir"/etc/dropbear
-for t in rsa dss ed25519 ecdsa; do
-  dropbearkey -t $t -f "$dir/etc/dropbear/dropbear_${t}_host_key"
-done
-
-sudo mkdir -p "$dir"/root/.ssh
-echo ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEhrcTPMrhrOdwpgFkRFjTt8rdxt3gg16LJvBCZENRWa user@personal | sudo tee "$dir"/root/.ssh/authorized_keys
-echo "auto lo
-iface lo inet loopback" > "$dir"/etc/network/interfaces
-
-rm rootfs.ext4
-fallocate --length 1G rootfs.ext4
-mkfs.ext4 rootfs.ext4
-
-mkdir -p /tmp/rootfs
-sudo mount rootfs.ext4 /tmp/rootfs
-sudo cp -r "$dir"/* /tmp/rootfs/
-sudo umount /tmp/rootfs
-
-# sudo rm -rf "$dir"
diff --git a/rootfs/.npmrc b/rootfs/.npmrc
new file mode 100644
index 0000000..97c56e9
--- /dev/null
+++ b/rootfs/.npmrc
@@ -0,0 +1 @@
+@nulo:registry=https://gitea.nulo.in/api/packages/nulo/npm/
diff --git a/rootfs/build.js b/rootfs/build.js
new file mode 100644
index 0000000..bbccf44
--- /dev/null
+++ b/rootfs/build.js
@@ -0,0 +1,126 @@
+import { init } from "@nulo/apkit";
+import { execFile as _execFile } from "node:child_process";
+import {
+  chmod,
+  mkdir,
+  mkdtemp,
+  readFile,
+  readdir,
+  rm,
+  symlink,
+  writeFile,
+} from "node:fs/promises";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { promisify } from "node:util";
+const execFile = promisify(_execFile);
+
+const root = await mkdtemp(join(tmpdir(), "tmp.fireactions-rootfs."));
+const alpine = await init(root);
+await alpine.install(["dropbear", "util-linux", "dropbear-dbclient", "dhcpcd"]);
+
+// gotta go fast
+await append(r("/etc/rc.conf"), 'rc_parallel="YES"');
+
+await mkdirp(r("/usr/local/sbin"));
+await execFile("go", [
+  "build",
+  "-tags=netgo",
+  "-o",
+  r("/usr/local/sbin/fireactions-agent"),
+  "./agent",
+]);
+// https://github.com/OpenRC/openrc/blob/master/service-script-guide.md
+await writeFile(
+  r("/etc/init.d/fireactions-agent"),
+  `#!/sbin/openrc-run
+pidfile="/run/\${RC_SVCNAME}.pid"
+command_background=true
+command=/usr/local/sbin/fireactions-agent`
+);
+await chmod(r("/etc/init.d/fireactions-agent"), 0o700);
+await alpine.rcUpdate("default", "fireactions-agent");
+
+await alpine.rcUpdate("boot", "devfs");
+await alpine.rcUpdate("boot", "procfs");
+await alpine.rcUpdate("boot", "sysfs");
+// alpine.rcUpdate('default', 'dhcpcd')
+await alpine.rcUpdate("default", "dropbear");
+
+await writeFile(r("/etc/securetty"), "ttyS0");
+await symlink("agetty", r("/etc/init.d/agetty.ttyS0"));
+await alpine.rcUpdate("default", "agetty.ttyS0");
+
+await mkdirp(r("/etc/dropbear"));
+for (const t of ["rsa", "dss", "ed25519", "ecdsa"]) {
+  await execFile("dropbearkey", [
+    "-t",
+    t,
+    "-f",
+    r(`/etc/dropbear/dropbear_${t}_host_key`),
+  ]);
+}
+
+await execFile("sudo", ["mkdir", "-p", r("/root/.ssh")]);
+await writeFile(
+  "authorized_keys",
+  "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEhrcTPMrhrOdwpgFkRFjTt8rdxt3gg16LJvBCZENRWa user@personal"
+);
+await execFile("sudo", [
+  "mv",
+  "authorized_keys",
+  r("/root/.ssh/authorized_keys"),
+]);
+
+await alpine.rcUpdate("default", "networking");
+await writeFile(
+  r("/etc/network/interfaces"),
+  `auto lo
+iface lo inet loopback`
+);
+
+const ext4 = "rootfs.ext4";
+await rm(ext4);
+await execFile("fallocate", ["--length", "1G", ext4]);
+await execFile("mkfs.ext4", [ext4]);
+
+const mountpoint = await mkdtemp(join(tmpdir(), "tmp.fireactions-mountpoint."));
+try {
+  await mkdirp(mountpoint);
+  await execFile("sudo", ["mount", ext4, mountpoint]);
+  try {
+    for (const dir of await readdir(root)) {
+      await execFile("sudo", ["cp", "-r", r(dir), mountpoint]);
+    }
+  } finally {
+    await execFile("sudo", ["umount", mountpoint]);
+  }
+} finally {
+  await rm(mountpoint, { recursive: true });
+}
+
+// # sudo rm -rf "$dir"
+
+// helpers
+/**
+ * @param {import("node:fs").PathLike} path
+ * @param {string} content
+ * @returns {Promise<void>}
+ */
+async function append(path, content) {
+  const file = await readFile(path, "utf-8");
+  await writeFile(path, file + "\n" + content);
+}
+/**
+ * @param {import("node:fs").PathLike} path
+ * @returns {Promise<void>}
+ */
+async function mkdirp(path) {
+  await mkdir(path, { recursive: true });
+}
+/**
+ * @param {string} path
+ */
+function r(path) {
+  return join(root, path);
+}
diff --git a/rootfs/package.json b/rootfs/package.json
new file mode 100644
index 0000000..a29052e
--- /dev/null
+++ b/rootfs/package.json
@@ -0,0 +1,20 @@
+{
+  "name": "fireactions-rootfs",
+  "type": "module",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "@nulo/apkit": "https://gitea.nulo.in/Nulo/apkit"
+  },
+  "devDependencies": {
+    "@tsconfig/node16": "^1.0.4",
+    "@types/node": "^20.2.5"
+  }
+}
diff --git a/rootfs/pnpm-lock.yaml b/rootfs/pnpm-lock.yaml
new file mode 100644
index 0000000..7e4ca0b
--- /dev/null
+++ b/rootfs/pnpm-lock.yaml
@@ -0,0 +1,19 @@
+lockfileVersion: '6.0'
+
+devDependencies:
+  '@tsconfig/node16':
+    specifier: ^1.0.4
+    version: 1.0.4
+  '@types/node':
+    specifier: ^20.2.5
+    version: 20.2.5
+
+packages:
+
+  /@tsconfig/node16@1.0.4:
+    resolution: {integrity: sha512-vxhUy4J8lyeyinH7Azl1pdd43GJhZH/tP2weN8TntQblOY+A0XbT8DJk1/oCPuOOyg/Ja757rG0CgHcWC8OfMA==}
+    dev: true
+
+  /@types/node@20.2.5:
+    resolution: {integrity: sha512-JJulVEQXmiY9Px5axXHeYGLSjhkZEnD+MDPDGbCbIAbMslkKwmygtZFy1X6s/075Yo94sf8GuSlFfPzysQrWZQ==}
+    dev: true
diff --git a/rootfs/tsconfig.json b/rootfs/tsconfig.json
new file mode 100644
index 0000000..7105231
--- /dev/null
+++ b/rootfs/tsconfig.json
@@ -0,0 +1,8 @@
+{
+  "extends": "@tsconfig/node16/tsconfig.json",
+  "exclude": ["build.js/", "build/"],
+  "compilerOptions": {
+    "allowJs": true,
+    "checkJs": true
+  }
+}