From 5502061f21585c02b75ad9ffd02fcbef78e861d0 Mon Sep 17 00:00:00 2001
From: Nulo <git@nulo.in>
Date: Tue, 28 Mar 2023 14:00:55 -0300
Subject: [PATCH] instalar docker, hacer booteable

---
 index.ts | 40 ++++++++++++++++++++++++++++++++++++++--
 1 file changed, 38 insertions(+), 2 deletions(-)

diff --git a/index.ts b/index.ts
index 7581e6e..5a8a01a 100644
--- a/index.ts
+++ b/index.ts
@@ -4,17 +4,23 @@ import {
   copyFile,
   mkdir,
   opendir,
+  readdir,
   rm,
   symlink,
   writeFile,
 } from "node:fs/promises";
+import { tmpdir } from "node:os";
 import { basename, join } from "node:path";
 import { promisify } from "node:util";
 
 const execFile = promisify(execFileCallback);
 
+// TODO: configurar runsc
+// TODO: cache de apk (robar de define-alpine-the-sequel)
+
 const currRootPath = await setupRootfsDir();
 await setupBasicApkEnvironment(currRootPath);
+const packages = ["alpine-base", "fish", "docker", "linux-virt"];
 await execFile("doas", [
   "apk",
   "--initdb",
@@ -22,9 +28,25 @@ await execFile("doas", [
   "--root",
   currRootPath,
   "add",
-  ...["alpine-baselayout", "busybox", "libc-utils", "alpine-keys"],
-  "fish",
+  ...packages,
 ]);
+await chroot(currRootPath, ["rc-update", "add", "docker", "default"]);
+
+await chroot(currRootPath, ["rc-update", "add", "localmount", "boot"]);
+await writeFstab(currRootPath);
+
+// make VM disk image
+const ext4Path = "raw.ext4";
+await execFile("qemu-img", ["create", "-f", "raw", ext4Path, "50G"]);
+await execFile("mkfs.ext4", [ext4Path]);
+
+const mntdir = join(tmpdir(), "woodpecker-in-a-vm-" + nanoid());
+await mkdir(mntdir);
+await execFile("doas", ["mount", ext4Path, mntdir]);
+for (const path of await readdir(currRootPath))
+  await execFile("doas", ["cp", "-r", join(currRootPath, path), mntdir]);
+await execFile("doas", ["umount", mntdir]);
+await execFile("qemu-img", ["convert", "-O", "qcow2", ext4Path, "vm.qcow2"]);
 
 async function setupRootfsDir() {
   const artifactsPath = "./artifacts";
@@ -58,3 +80,17 @@ async function setupBasicApkEnvironment(rootfs: string) {
     ].join("\n")
   );
 }
+
+async function writeFstab(rootfs: string) {
+  const virtualDiskName = "/dev/vda";
+  await writeFile(
+    "fstab",
+    `${virtualDiskName}	/	ext4	rw,relatime,discard 0 1
+`
+  );
+  await execFile("doas", ["mv", "fstab", join(rootfs, "/etc/fstab")]);
+}
+
+async function chroot(rootfs: string, cmd: string[]) {
+  await execFile("doas", ["chroot", rootfs, ...cmd]);
+}