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nixos/nbd: fix nbd-server config section ordering

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Closes #169103
This commit is contained in:
Alexandru Scvortov 2022-04-18 09:44:46 +01:00
parent d0343685e1
commit 4646491175
2 changed files with 44 additions and 15 deletions
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43
nixos/modules/services/networking/nbd.nix
View file

@ -4,28 +4,34 @@ with lib;
let
cfg = config.services.nbd;
configFormat = pkgs.formats.ini { };
iniFields = with types; attrsOf (oneOf [ bool int float str ]);
serverConfig = configFormat.generate "nbd-server-config"
({
generic =
(cfg.server.extraOptions // {
user = "root";
group = "root";
port = cfg.server.listenPort;
} // (optionalAttrs (cfg.server.listenAddress != null) {
listenaddr = cfg.server.listenAddress;
}));
}
// (mapAttrs
# The `[generic]` section must come before all the others in the
# config file. This means we can't just dump an attrset to INI
# because that sorts the sections by name. Instead, we serialize it
# on its own first.
genericSection = {
generic = (cfg.server.extraOptions // {
user = "root";
group = "root";
port = cfg.server.listenPort;
} // (optionalAttrs (cfg.server.listenAddress != null) {
listenaddr = cfg.server.listenAddress;
}));
};
exportSections =
mapAttrs
(_: { path, allowAddresses, extraOptions }:
extraOptions // {
exportname = path;
} // (optionalAttrs (allowAddresses != null) {
authfile = pkgs.writeText "authfile" (concatStringsSep "\n" allowAddresses);
}))
cfg.server.exports)
);
cfg.server.exports;
serverConfig =
pkgs.writeText "nbd-server-config" ''
${lib.generators.toINI {} genericSection}
${lib.generators.toINI {} exportSections}
'';
splitLists =
partition
(path: hasPrefix "/dev/" path)
@ -103,6 +109,13 @@ in
};
config = mkIf cfg.server.enable {
assertions = [
{
assertion = !(cfg.server.exports ? "generic");
message = "services.nbd.server exports must not be named 'generic'";
}
];
boot.kernelModules = [ "nbd" ];
systemd.services.nbd-server = {

16
nixos/tests/nbd.nix
View file

@ -28,6 +28,11 @@ import ./make-test-python.nix ({ pkgs, ... }:
## It's also a loopback device to test exporting /dev/...
systemd.services.create-priv-file =
mkCreateSmallFileService { path = "/vault-priv.disk"; loop = true; };
## `aaa.disk` is just here because "[aaa]" sorts before
## "[generic]" lexicographically, and nbd-server breaks if
## "[generic]" isn't the first section.
systemd.services.create-aaa-file =
mkCreateSmallFileService { path = "/aaa.disk"; };
# Needed only for nbd-client used in the tests.
environment.systemPackages = [ pkgs.nbd ];
@ -39,6 +44,9 @@ import ./make-test-python.nix ({ pkgs, ... }:
services.nbd.server = {
enable = true;
exports = {
aaa = {
path = "/aaa.disk";
};
vault-pub = {
path = "/vault-pub.disk";
};
@ -83,5 +91,13 @@ import ./make-test-python.nix ({ pkgs, ... }:
if foundString != testString:
raise Exception(f"Read the wrong string from nbd disk. Expected: '{testString}'. Found: '{foundString}'")
server.succeed("nbd-client -d /dev/nbd0")
# Server: Successfully connect to the aaa disk
server.succeed("nbd-client localhost ${toString listenPort} /dev/nbd0 -name aaa -persist")
server.succeed(f"echo '{testString}' | dd of=/dev/nbd0 conv=notrunc")
foundString = server.succeed(f"dd status=none if=/aaa.disk count={len(testString)}")[:len(testString)]
if foundString != testString:
raise Exception(f"Read the wrong string from nbd disk. Expected: '{testString}'. Found: '{foundString}'")
server.succeed("nbd-client -d /dev/nbd0")
'';
})