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|
{ pkgs, lib, ... }:
{
name = "containers-tmpfs";
meta = {
maintainers = with lib.maintainers; [ patryk27 ];
};
nodes.machine =
{ pkgs, ... }:
{
imports = [ ../modules/installer/cd-dvd/channel.nix ];
virtualisation.writableStore = true;
containers.tmpfs = {
autoStart = true;
tmpfs = [
# Mount var as a tmpfs
"/var"
# Add a nested mount inside a tmpfs
"/var/log"
# Add a tmpfs on a path that does not exist
"/some/random/path"
];
config = {
nix.enable = false; # disabled by default on the test's host. See all-tests.nix / tag(no-nix-by-default)
};
};
virtualisation.additionalPaths = [ pkgs.stdenv ];
};
testScript = ''
machine.wait_for_unit("default.target")
assert "tmpfs" in machine.succeed("nixos-container list")
with subtest("tmpfs container is up"):
assert "up" in machine.succeed("nixos-container status tmpfs")
def tmpfs_cmd(command):
return f"nixos-container run tmpfs -- {command} 2>/dev/null"
with subtest("/var is mounted as a tmpfs"):
machine.succeed(tmpfs_cmd("mountpoint -q /var"))
with subtest("/var/log is mounted as a tmpfs"):
assert "What: tmpfs" in machine.succeed(
tmpfs_cmd("systemctl status var-log.mount --no-pager")
)
machine.succeed(tmpfs_cmd("mountpoint -q /var/log"))
with subtest("/some/random/path is mounted as a tmpfs"):
assert "What: tmpfs" in machine.succeed(
tmpfs_cmd("systemctl status some-random-path.mount --no-pager")
)
machine.succeed(tmpfs_cmd("mountpoint -q /some/random/path"))
with subtest(
"files created in the container in a non-tmpfs directory are visible on the host."
):
# This establishes legitimacy for the following tests
machine.succeed(
tmpfs_cmd("touch /root/test.file"),
tmpfs_cmd("ls -l /root | grep -q test.file"),
"test -e /var/lib/nixos-containers/tmpfs/root/test.file",
)
with subtest(
"/some/random/path is writable and that files created there are not "
+ "in the hosts container dir but in the tmpfs"
):
machine.succeed(
tmpfs_cmd("touch /some/random/path/test.file"),
tmpfs_cmd("test -e /some/random/path/test.file"),
)
machine.fail("test -e /var/lib/nixos-containers/tmpfs/some/random/path/test.file")
with subtest(
"files created in the hosts container dir in a path where a tmpfs "
+ "file system has been mounted are not visible to the container as "
+ "they do not exist in the tmpfs"
):
machine.succeed(
"touch /var/lib/nixos-containers/tmpfs/var/test.file",
"test -e /var/lib/nixos-containers/tmpfs/var/test.file",
"ls -l /var/lib/nixos-containers/tmpfs/var/ | grep -q test.file 2>/dev/null",
)
machine.fail(tmpfs_cmd("ls -l /var | grep -q test.file"))
'';
}
|
