nixpkgs/nixos/tests/activation/etc-overlay-mutable.nix
Silvan Mosberger 4f0dadbf38 treewide: format all inactive Nix files
After final improvements to the official formatter implementation,
this commit now performs the first treewide reformat of Nix files using it.
This is part of the implementation of RFC 166.

Only "inactive" files are reformatted, meaning only files that
aren't being touched by any PR with activity in the past 2 months.
This is to avoid conflicts for PRs that might soon be merged.
Later we can do a full treewide reformat to get the rest,
which should not cause as many conflicts.

A CI check has already been running for some time to ensure that new and
already-formatted files are formatted, so the files being reformatted here
should also stay formatted.

This commit was automatically created and can be verified using

    nix-build a08b3a4d19.tar.gz \
      --argstr baseRev b32a094368
    result/bin/apply-formatting $NIXPKGS_PATH
2024-12-10 20:26:33 +01:00

78 lines
2.8 KiB
Nix

{ lib, ... }:
{
name = "activation-etc-overlay-mutable";
meta.maintainers = with lib.maintainers; [ nikstur ];
nodes.machine =
{ pkgs, ... }:
{
system.etc.overlay.enable = true;
system.etc.overlay.mutable = true;
# Prerequisites
boot.initrd.systemd.enable = true;
boot.kernelPackages = pkgs.linuxPackages_latest;
specialisation.new-generation.configuration = {
environment.etc."newgen".text = "newgen";
};
specialisation.newer-generation.configuration = {
environment.etc."newergen".text = "newergen";
};
};
testScript = # python
''
newergen = machine.succeed("realpath /run/current-system/specialisation/newer-generation/bin/switch-to-configuration").rstrip()
with subtest("/run/etc-metadata/ is mounted"):
print(machine.succeed("mountpoint /run/etc-metadata"))
with subtest("No temporary files leaked into stage 2"):
machine.succeed("[ ! -e /etc-metadata-image ]")
machine.succeed("[ ! -e /etc-basedir ]")
with subtest("/etc is mounted as an overlay"):
machine.succeed("findmnt --kernel --type overlay /etc")
with subtest("switching to the same generation"):
machine.succeed("/run/current-system/bin/switch-to-configuration test")
with subtest("the initrd didn't get rebuilt"):
machine.succeed("test /run/current-system/initrd -ef /run/current-system/specialisation/new-generation/initrd")
with subtest("switching to a new generation"):
machine.fail("stat /etc/newgen")
machine.succeed("echo -n 'mutable' > /etc/mutable")
# Directory
machine.succeed("mkdir /etc/mountpoint")
machine.succeed("mount -t tmpfs tmpfs /etc/mountpoint")
machine.succeed("touch /etc/mountpoint/extra-file")
# File
machine.succeed("touch /etc/filemount")
machine.succeed("mount --bind /dev/null /etc/filemount")
machine.succeed("/run/current-system/specialisation/new-generation/bin/switch-to-configuration switch")
assert machine.succeed("cat /etc/newgen") == "newgen"
assert machine.succeed("cat /etc/mutable") == "mutable"
print(machine.succeed("findmnt /etc/mountpoint"))
print(machine.succeed("stat /etc/mountpoint/extra-file"))
print(machine.succeed("findmnt /etc/filemount"))
machine.succeed(f"{newergen} switch")
assert machine.succeed("cat /etc/newergen") == "newergen"
tmpMounts = machine.succeed("find /tmp -maxdepth 1 -type d -regex '/tmp/nixos-etc\\..*' | wc -l").rstrip()
metaMounts = machine.succeed("find /tmp -maxdepth 1 -type d -regex '/tmp/nixos-etc-metadata\\..*' | wc -l").rstrip()
assert tmpMounts == "0", f"Found {tmpMounts} remaining tmpmounts"
assert metaMounts == "1", f"Found {metaMounts} remaining metamounts"
'';
}