alpine: add script to automatically build state image using nodejs

examples/alpine.html

@@ -19,6 +19,7 @@ window.onload = function()
         autostart: true,
         bzimage_initrd_from_filesystem: true,
         cmdline: "rw root=host9p rootfstype=9p rootflags=trans=virtio,cache=loose modules=virtio_pci tsc=reliable",
+        //initial_state: { url: "../images/alpine-state.bin" },
     });
 };
 </script>

tools/docker/alpine/Readme.md

@@ -3,3 +3,4 @@ You can build a Alpine Linux 9p image using Docker:
 1. As needed, kernel flavor (`virt` is smaller than `lts`, but don't have networking) and set of additional packages (community repo is enabled by default) can be edited in `Dockerfile`
 2. Check and run `./build.sh` with started dockerd (podman works)
 3. Run local webserver (e.g. `make run`) and open `examples/alpine.html`
+4. (optional) Run `./build-state.js` and add `initial_state: { url: "../images/alpine-state.bin" }` to `alpine.html`

tools/docker/alpine/build-state.js

@@ -0,0 +1,59 @@
+#!/usr/bin/env node
+"use strict";
+
+console.log("Don't forget to run `make all` before running this script");
+
+const path = require("path");
+const fs = require("fs");
+const V86 = require("./../../../build/libv86.js").V86;
+
+const V86_ROOT = path.join(__dirname, "../../..");
+const OUTPUT_FILE = path.join(V86_ROOT, "images/alpine-state.bin");
+
+var emulator = new V86({
+    bios: { url: path.join(V86_ROOT, "bios/seabios.bin") },
+    vga_bios: { url: path.join(V86_ROOT, "bios/vgabios.bin") },
+    autostart: true,
+    memory_size: 512 * 1024 * 1024,
+    vga_memory_size: 8 * 1024 * 1024,
+    network_relay_url: "<UNUSED>",
+    bzimage_initrd_from_filesystem: true,
+    cmdline: "rw root=host9p rootfstype=9p rootflags=trans=virtio,cache=loose modules=virtio_pci tsc=reliable init_on_free=on",
+    filesystem: {
+        baseurl: path.join(V86_ROOT, "images/alpine-rootfs-flat"),
+        basefs: path.join(V86_ROOT, "images/alpine-fs.json"),
+    },
+    screen_dummy: true,
+});
+
+console.log("Now booting, please stand by ...");
+
+let serial_text = "";
+let booted = false;
+
+emulator.add_listener("serial0-output-byte", function(byte)
+{
+    const c = String.fromCharCode(byte);
+    //process.stdout.write(c);
+
+    serial_text += c;
+
+    if(!booted && serial_text.endsWith("localhost:~# "))
+    {
+        booted = true;
+
+        emulator.serial0_send("sync;echo 3 >/proc/sys/vm/drop_caches\n");
+
+        setTimeout(async function ()
+            {
+                const s = await emulator.save_state();
+
+                fs.writeFile(OUTPUT_FILE, new Uint8Array(s), function(e)
+                    {
+                        if(e) throw e;
+                        console.log("Saved as " + OUTPUT_FILE);
+                        emulator.stop();
+                    });
+            }, 10 * 1000);
+    }
+});

tools/docker/alpine/build.sh

@@ -27,5 +27,3 @@ mkdir -p "$OUT_ROOTFS_FLAT"
 ../../../tools/copy-to-sha256.py "$OUT_ROOTFS_TAR" "$OUT_ROOTFS_FLAT"
 
 echo "$OUT_ROOTFS_TAR", "$OUT_ROOTFS_FLAT" and "$OUT_FSJSON" created.
-
-# TODO: auto-build state, add examples/alpine.html