Raito Bezarius
87d99da6ca
When Ctrl-C is sent to the workload, even across remote builds, the whole process possess a global flag `_isInterrupted` which is checked in certain filesystem operations, cancelling them, e.g. writeFile will write nothing under interruption unwinding. In addition, if any operation throws an exception before we `rmdir` the cgroup, we may leave it hanging while we remove the state record. Therefore, we put the final cleanup in a block. In practice, reading statistics could lead to failures. Control groups cleanups are critical though and should always be performed. Change-Id: I48fa87317b6a9f6663559bc8fa5f8a897f37011e Signed-off-by: Raito Bezarius <raito@lix.systems>
49 lines
1.6 KiB
Nix
49 lines
1.6 KiB
Nix
{ nixpkgs, ... }:
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{
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name = "cgroups";
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nodes =
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{
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host =
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{ config, pkgs, ... }:
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{ virtualisation.additionalPaths = [ pkgs.stdenvNoCC ];
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nix.extraOptions =
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''
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extra-experimental-features = nix-command auto-allocate-uids cgroups
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extra-system-features = uid-range
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'';
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nix.settings.use-cgroups = true;
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nix.nixPath = [ "nixpkgs=${nixpkgs}" ];
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};
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};
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testScript = { nodes }: ''
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start_all()
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host.wait_for_unit("multi-user.target")
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# Start build in background
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host.execute("NIX_REMOTE=daemon nix build --use-cgroups --auto-allocate-uids --file ${./hang.nix} >&2 &")
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pid = int(host.succeed("pgrep nix"))
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service = "/sys/fs/cgroup/system.slice/nix-daemon.service"
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# Wait for cgroups to be created
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host.succeed(f"until [ -e {service}/supervisor ]; do sleep 1; done", timeout=30)
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host.succeed(f"until [ -e {service}/nix-build-uid-* ]; do sleep 1; done", timeout=30)
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# Check that there aren't processes where there shouldn't be, and that there are where there should be
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host.succeed(f'[ -z "$(cat {service}/cgroup.procs)" ]')
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host.succeed(f'[ -n "$(cat {service}/supervisor/cgroup.procs)" ]')
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host.succeed(f'[ -n "$(cat {service}/nix-build-uid-*/cgroup.procs)" ]')
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# Perform an interrupt
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host.execute(f"kill -SIGINT {pid}")
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# Check that there aren't any cgroups anymore, neither any state records
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host.succeed(f"until [ ! -e {service}/nix-build-uid-* ]; do sleep 1; done", timeout=30)
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host.succeed("until [ ! -e /nix/var/nix/cgroups/nix-build-uid-* ]; do sleep 1; done", timeout=30)
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'';
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}
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