machines/dnyarri: Enable bcache kernel module

Since I got a new SSD for the machine (thanks @cvdnext), I also had the
opportunity to re-create my LUKS containers to LUKS2 with Argon2 key
derivation alongside creating bcache backing devices.

The change in order to support bcache is just a matter of adding
"bcache" to availableKernelModules and we're done.

However, as the storage configuration is not a very common one, I
decided to add a test specific to that to make sure future NixOS updates
won't prevent the machine from booting.

Signed-off-by: aszlig <aszlig@nix.build>

2 files changed, 128 insertions, 0 deletions

diff --git a/tests/aszlig/dnyarri/luks2-bcache.nix b/tests/aszlig/dnyarri/luks2-bcache.nix
new file mode 100644
index 00000000..c728a41a
--- /dev/null
+++ b/tests/aszlig/dnyarri/luks2-bcache.nix
@@ -0,0 +1,127 @@
+{
+  name = "dnyarri-luks2-bcache";
+
+  nodes.machine = { pkgs, ... }: {
+    environment.systemPackages = [
+      pkgs.cryptsetup pkgs.bcache-tools pkgs.btrfs-progs
+    ];
+    virtualisation.memorySize = 2048;
+    virtualisation.emptyDiskImages = [ 5 2048 2048 512 ];
+  };
+
+  nodes.newmachine = { pkgs, lib, ... }: {
+    virtualisation.memorySize = 2048;
+    virtualisation.emptyDiskImages = [ 5 2048 2048 512 ];
+    boot.initrd.luks.devices = lib.mkOverride 0 {
+      test1.device = "/dev/disk/by-uuid/07b821b9-0912-4f03-9ebc-89f41704caff";
+      test1.keyFile = "/dev/vdb";
+      test2.device = "/dev/disk/by-uuid/d140fd40-bb3c-48b5-98e0-b75878dbce66";
+      test2.keyFile = "/dev/vdb";
+    };
+    boot.initrd.availableKernelModules = [ "bcache" ];
+    boot.initrd.postMountCommands = ''
+      test 'hello test' = "$(cat /mnt-root/test/hi.txt)" || exit 1
+    '';
+    fileSystems = lib.mkVMOverride {
+      "/test" = {
+        fsType = "btrfs";
+        label = "testfs";
+        neededForBoot = true;
+      };
+    };
+  };
+
+  testScript = let
+    luksOpts = "--type LUKS2 --pbkdf argon2id -s 512 -h sha512";
+    luksFormat = "cryptsetup luksFormat -q ${luksOpts}";
+    uuid1 = "07b821b9-0912-4f03-9ebc-89f41704caff";
+    uuid2 = "d140fd40-bb3c-48b5-98e0-b75878dbce66";
+  in ''
+    $machine->waitForUnit('multi-user.target');
+
+    $machine->nest('setting up LUKS2 and bcache backing devices', sub {
+      $machine->succeed('dd if=/dev/urandom of=/dev/vdb bs=1 count=200');
+
+      $machine->succeed('make-bcache -B /dev/vdc');
+      $machine->succeed('make-bcache -B /dev/vdd');
+
+      $machine->waitUntilSucceeds(
+        '[ $(echo /dev/bcache[0-9]* | wc -w) -eq 2 ]'
+      );
+      my $bcache1 = $machine->succeed('ls -1 /dev/bcache[0-9]* | head -n1');
+      chomp $bcache1;
+      my $bcache2 = $machine->succeed('ls -1 /dev/bcache[0-9]* | tail -n1');
+      chomp $bcache2;
+
+      $machine->succeed(
+        "${luksFormat} $bcache1 --uuid ${uuid1} /dev/vdb",
+        "cryptsetup open $bcache1 l1 --key-file=/dev/vdb",
+      );
+
+      $machine->succeed(
+        "${luksFormat} $bcache2 --uuid ${uuid2} /dev/vdb",
+        "cryptsetup open $bcache2 l2 --key-file=/dev/vdb",
+      );
+
+      $machine->succeed(
+        'mkfs.btrfs -L testfs -m raid1 -d raid1 /dev/mapper/l1 /dev/mapper/l2',
+        'btrfs dev scan',
+        'mkdir /mnt-test',
+        'mount /dev/disk/by-label/testfs /mnt-test',
+        'echo hello test > /mnt-test/hi.txt',
+        'umount /mnt-test',
+        'cryptsetup close l1',
+        'cryptsetup close l2',
+      );
+    });
+
+    $machine->nest('rebooting into new configuration', sub {
+      $machine->shutdown;
+      $newmachine->{stateDir} = $machine->{stateDir};
+      $newmachine->waitForUnit('multi-user.target');
+    });
+
+    my $bcache1 =
+      $newmachine->succeed('cd /dev; ls -1 bcache[0-9]* | head -n1');
+    chomp $bcache1;
+    my $bcache2 =
+      $newmachine->succeed('cd /dev; ls -1 bcache[0-9]* | tail -n1');
+    chomp $bcache2;
+
+    $machine->nest('attaching bcache cache device', sub {
+      my $csetuuid = $newmachine->succeed(
+        'make-bcache -C /dev/vde | sed -n -e "s/^Set UUID:[^a-f0-9]*//p"'
+      );
+
+      $newmachine->succeed(
+        "echo $csetuuid > /sys/block/$bcache1/bcache/attach",
+        "echo writeback > /sys/block/$bcache1/bcache/cache_mode",
+        "echo $csetuuid > /sys/block/$bcache2/bcache/attach",
+        "echo writeback > /sys/block/$bcache2/bcache/cache_mode"
+      );
+    });
+
+    $machine->nest('write random files to test file system', sub {
+      $newmachine->succeed(
+        'for i in $(seq 100); do'.
+        ' dd if=/dev/urandom of="/test/randfile.$i" bs=1 count=100;'.
+        ' sha256sum "/test/randfile.$i" > "/test/randfile.$i.sha256"; '.
+        'done'
+      );
+    });
+
+    $machine->nest('reboot to clear disk buffers', sub {
+      $newmachine->shutdown;
+      $newmachine->waitForUnit('multi-user.target');
+    });
+
+    $machine->nest('verifying contents of random files created earlier', sub {
+      $newmachine->succeed(
+        'for i in $(seq 100); do'.
+        ' sha256sum "/test/randfile.$i" | cmp - "/test/randfile.$i.sha256"'.
+        ' || exit 1; '.
+        'done'
+      );
+    });
+  '';
+}
diff --git a/tests/default.nix b/tests/default.nix
index 44167e07..5e9355e0 100644
--- a/tests/default.nix
+++ b/tests/default.nix
@@ -9,6 +9,7 @@ let
   };
 
 in {
+  aszlig.dnyarri.luks2-bcache = callTest ./aszlig/dnyarri/luks2-bcache.nix;
   games = {
     starbound = callTest ./games/starbound.nix;
   };