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nixos/tests/installer: Add test for LUKS rootfs.

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This serves as a regression test for #7859.

It's pretty straightforward, except from the fact that nixos-generate-
config doesn't detect LUKS devices and the "sleep 60".

As for the former, I have tried to add support for LUKS devices for
nixos-generate-config, but it's not so easy as it sounds, because we
need to create a device tree across all possible mappers and/or LVM up
to the "real" device and then decide whether it is relevant to what is
currently mounted. So I guess this is something for the nixpart branch
(see #2079).

And the latter isn't very trivial as well, because the LUKS passphrase
prompt is issued on /dev/console, which is the last "console=..." kernel
parameter (thus the `mkAfter`). So we can't simply grep the log, because
the prompt ends up being on one terminal only (tty0) and using select()
on $machine->{socket} doesn't work very well, because the FD is always
"ready for read". If we would read the FD, we would conflict with
$machine->connect and end up having an inconsistent state. Another idea
would be to use multithreading to do $machine->connect while feeding the
passphrase prompt in a loop and stop the thread once $machine->connect
is done. Turns out that this is not so easy as well, because the threads
need to share the $machine object and of course need to do properly
locking.

In the end I decided to use the "blindly hope that 60 seconds is enough"
approach for now and come up with a better solution later. Other VM
tests surely use sleep as well, but it's $machine->sleep, which is bound
to the clock of the VM, so if the build machine is on high load, a
$machine->sleep gets properly delayed but the timer outside the VM won't
get that delay, so the test is not deterministic.

Tested against the following revisions:

5e3fe39: Before the libgcrypt cleanup (a71f78a) that broke cryptsetup.
69a6848: While cryptsetup was broken (obviously the test failed).
15faa43: After cryptsetup has been switched to OpenSSL (fd588f9).

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
This commit is contained in:
aszlig 2015-05-21 12:42:00 +02:00
parent 3b396701fd
commit 1f34503010
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37
nixos/tests/installer.nix
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@ -334,6 +334,43 @@ in {
'';
};
# Boot off an encrypted root partition
luksroot = makeInstallerTest "luksroot"
{ createPartitions = ''
$machine->succeed(
"parted /dev/vda mklabel msdos",
"parted /dev/vda -- mkpart primary ext2 1M 50MB", # /boot
"parted /dev/vda -- mkpart primary linux-swap 50M 1024M",
"parted /dev/vda -- mkpart primary 1024M -1s", # LUKS
"udevadm settle",
"mkswap /dev/vda2 -L swap",
"swapon -L swap",
"modprobe dm_mod dm_crypt",
"echo -n supersecret | cryptsetup luksFormat -q /dev/vda3 -",
"echo -n supersecret | cryptsetup luksOpen --key-file - /dev/vda3 cryptroot",
"mkfs.ext3 -L nixos /dev/mapper/cryptroot",
"mount LABEL=nixos /mnt",
"mkfs.ext3 -L boot /dev/vda1",
"mkdir -p /mnt/boot",
"mount LABEL=boot /mnt/boot",
);
'';
# XXX: Currently, generate-config doesn't detect LUKS yet.
extraConfig = ''
boot.kernelParams = lib.mkAfter [ "console=tty0" ];
boot.initrd.luks.devices = lib.singleton {
name = "cryptroot";
device = "/dev/vda3";
preLVM = true;
};
'';
preBootCommands = ''
$machine->start;
sleep 60; # XXX: Hopefully this is long enough :-/
$machine->sendChars("supersecret\n");
'';
};
swraid = makeInstallerTest "swraid"
{ createPartitions =
''