[PATCH] release/checks/try.nix: init

[Alyssa Ross <hi@alyssa.is>]

This is a regression test for c7f87f3 ("host/rootfs: allow growing ext
partition to fail").  It's the first time we're actually doing
automated tests of a Spectrum boot.  For now, I'm using the NixOS test
framework, but because we're not using NixOS and not setting any NixOS
options, it feels to me like it doesn't actually buy us very much, so
if it doesn't start adding more value as we add more (or more complex)
tests, it might be simpler to just use a shell/execline script for
tests.

Signed-off-by: Alyssa Ross <hi@alyssa.is>
---

Documentation for reviewing patches:
https://spectrum-os.org/doc/contributing/reviewing-patches.html

 release/checks/default.nix |  2 ++
 release/checks/try.nix     | 50 ++++++++++++++++++++++++++++++++++++++
 release/live/default.nix   |  2 +-
 3 files changed, 53 insertions(+), 1 deletion(-)
 create mode 100644 release/checks/try.nix

diff --git a/release/checks/default.nix b/release/checks/default.nix
index f8a3f9b..bf26b9a 100644
--- a/release/checks/default.nix
+++ b/release/checks/default.nix
@@ -15,4 +15,6 @@ import ../../lib/eval-config.nix ({ ... } @ args:
   rustfmt = import ./rustfmt.nix args;
 
   shellcheck = import ./shellcheck.nix args;
+
+  try = import ./try.nix args;
 })
diff --git a/release/checks/try.nix b/release/checks/try.nix
new file mode 100644
index 0000000..73539ef
--- /dev/null
+++ b/release/checks/try.nix
@@ -0,0 +1,50 @@
+# SPDX-License-Identifier: MIT
+# SPDX-FileCopyrightText: 2023 Alyssa Ross <hi@alyssa.is>
+
+import ../../lib/eval-config.nix ({ config, ... }:
+
+let
+  live = import ../live { inherit config; };
+in
+
+config.pkgs.nixosTest ({ pkgs, ... }: {
+  name = "try-spectrum-test";
+  nodes = {};
+
+  testScript = ''
+    import shlex
+    import subprocess
+
+    conf = subprocess.run([
+      "${pkgs.mtools}/bin/mcopy",
+      "-i",
+      "${live}@@1M",
+      "::loader/entries/spectrum.conf",
+      "-",
+    ], stdout=subprocess.PIPE)
+    conf.check_returncode()
+
+    cmdline = None
+    for line in conf.stdout.decode('utf-8').splitlines():
+      key, value = line.split(' ', 1)
+      if key == 'options':
+        cmdline = value
+
+    flags = " ".join(map(shlex.quote, [
+      "qemu-kvm",
+      "-m", "512",
+      "-kernel", "${live.rootfs.kernel}/${pkgs.stdenv.hostPlatform.linux-kernel.target}",
+      "-initrd", "${live.initramfs}",
+      "-device", "qemu-xhci",
+      "-device", "usb-storage,drive=drive1,removable=true",
+      "-drive", "file=${live},id=drive1,format=raw,if=none,readonly=on",
+      "-append", f"panic=-1 {cmdline}",
+    ]))
+
+    machine = create_machine({"startCommand": flags})
+
+    machine.start()
+    machine.wait_for_console_text("EXT4-fs \(sda4\): mounted filesystem")
+    machine.crash()
+  '';
+}))
diff --git a/release/live/default.nix b/release/live/default.nix
index b7ee036..6df73d4 100644
--- a/release/live/default.nix
+++ b/release/live/default.nix
@@ -48,6 +48,6 @@ stdenvNoCC.mkDerivation {
 
   enableParallelBuilding = true;
 
-  passthru = { inherit rootfs; };
+  passthru = { inherit initramfs rootfs; };
 }
 ) {})
-- 
2.37.1