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https://github.com/NixOS/nixpkgs.git
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df7c405f32
This avoids the dependence on the presence of /tmp, which causes issues with nixos-install
104 lines
4.3 KiB
Nix
104 lines
4.3 KiB
Nix
{ lib, ... }:
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{
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name = "activation-etc-overlay-immutable";
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meta.maintainers = with lib.maintainers; [ nikstur ];
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nodes.machine =
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{ pkgs, ... }:
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{
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system.etc.overlay.enable = true;
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system.etc.overlay.mutable = false;
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# Prerequisites
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systemd.sysusers.enable = true;
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users.mutableUsers = false;
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boot.initrd.systemd.enable = true;
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boot.kernelPackages = pkgs.linuxPackages_latest;
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time.timeZone = "Utc";
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# The standard resolvconf service tries to write to /etc and crashes,
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# which makes nixos-rebuild exit uncleanly when switching into the new generation
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services.resolved.enable = true;
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environment.etc = {
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"mountpoint/.keep".text = "keep";
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"filemount".text = "keep";
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};
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specialisation.new-generation.configuration = {
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environment.etc."newgen".text = "newgen";
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};
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specialisation.newer-generation.configuration = {
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environment.etc."newergen".text = "newergen";
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};
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};
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testScript = # python
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''
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newergen = machine.succeed("realpath /run/current-system/specialisation/newer-generation/bin/switch-to-configuration").rstrip()
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with subtest("/run/nixos-etc-metadata/ is mounted"):
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print(machine.succeed("mountpoint /run/nixos-etc-metadata"))
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with subtest("No temporary files leaked into stage 2"):
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machine.succeed("[ ! -e /etc-metadata-image ]")
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machine.succeed("[ ! -e /etc-basedir ]")
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with subtest("/etc is mounted as an overlay"):
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machine.succeed("findmnt --kernel --type overlay /etc")
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with subtest("direct symlinks point to the target without indirection"):
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assert machine.succeed("readlink -n /etc/localtime") == "/etc/zoneinfo/Utc"
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with subtest("/etc/mtab points to the right file"):
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assert "/proc/mounts" == machine.succeed("readlink --no-newline /etc/mtab")
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with subtest("Correct mode on the source password files"):
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assert machine.succeed("stat -c '%a' /var/lib/nixos/etc/passwd") == "644\n"
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assert machine.succeed("stat -c '%a' /var/lib/nixos/etc/group") == "644\n"
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assert machine.succeed("stat -c '%a' /var/lib/nixos/etc/shadow") == "0\n"
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assert machine.succeed("stat -c '%a' /var/lib/nixos/etc/gshadow") == "0\n"
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with subtest("Password files are symlinks to /var/lib/nixos/etc"):
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assert machine.succeed("readlink -f /etc/passwd") == "/var/lib/nixos/etc/passwd\n"
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assert machine.succeed("readlink -f /etc/group") == "/var/lib/nixos/etc/group\n"
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assert machine.succeed("readlink -f /etc/shadow") == "/var/lib/nixos/etc/shadow\n"
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assert machine.succeed("readlink -f /etc/gshadow") == "/var/lib/nixos/etc/gshadow\n"
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with subtest("switching to the same generation"):
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machine.succeed("/run/current-system/bin/switch-to-configuration test")
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with subtest("the initrd didn't get rebuilt"):
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machine.succeed("test /run/current-system/initrd -ef /run/current-system/specialisation/new-generation/initrd")
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with subtest("switching to a new generation"):
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machine.fail("stat /etc/newgen")
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machine.succeed("mount -t tmpfs tmpfs /etc/mountpoint")
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machine.succeed("touch /etc/mountpoint/extra-file")
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machine.succeed("mount --bind /dev/null /etc/filemount")
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machine.succeed("/run/current-system/specialisation/new-generation/bin/switch-to-configuration switch")
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assert machine.succeed("cat /etc/newgen") == "newgen"
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print(machine.succeed("findmnt /etc/mountpoint"))
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print(machine.succeed("ls /etc/mountpoint"))
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print(machine.succeed("stat /etc/mountpoint/extra-file"))
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print(machine.succeed("findmnt /etc/filemount"))
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machine.succeed(f"{newergen} switch")
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tmpMounts = machine.succeed("find /run -maxdepth 1 -type d -regex '/run/nixos-etc\\..*'").rstrip()
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print(tmpMounts)
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metaMounts = machine.succeed("find /run -maxdepth 1 -type d -regex '/run/nixos-etc-metadata.*'").rstrip()
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print(metaMounts)
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numOfTmpMounts = len(tmpMounts.splitlines())
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numOfMetaMounts = len(metaMounts.splitlines())
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assert numOfTmpMounts == 0, f"Found {numOfTmpMounts} remaining tmpmounts"
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assert numOfMetaMounts == 1, f"Found {numOfMetaMounts} remaining metamounts"
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'';
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}
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