28d3f89ad4
$ nix-build -A examples.dummy.config.debug.closure.erofs.list | xargs cat | xargs du -h 749M /nix/store/bzfv5x6lycq6hzhjv6d6vlk1q8fdg9di-base0.erofs 24M /nix/store/hp41jfq36y0mmjrzqilyh3jfsvqic3kb-nixos.erofs $ nix run -f . examples.dummy.config.uvms.cloud-hypervisor.runner ... <<< Welcome to NixOS 25.11pre-git (x86_64) - ttyS0 >>> nixos login: The definition of the `pkgs` fixpoint was moved to pkgs/default.nix. For that, dirToAttrs was moved to lib/, imported ad hoc
84 lines
2 KiB
Nix
84 lines
2 KiB
Nix
{
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lib,
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erofs-utils,
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runCommand,
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python3Minimal,
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bubblewrap,
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writeClosure,
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}:
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{
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name ? "${label}.erofs",
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label ? "image",
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roots ? [ ],
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rootsExclude ? [ ],
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erofsArgs ? [
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"--mount-point=/nix/store"
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"-z"
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"lz4hc,level=3"
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"-T0"
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"-L"
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label
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"--all-root"
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],
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...
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}@attrs:
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let
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old = writeClosure rootsExclude;
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new = writeClosure roots;
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attrs' = lib.removeAttrs [ "name" "roots" "rootsExclude" "erofsArgs" ] attrs;
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in
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runCommand name
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(
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attrs
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// {
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__structuredAttrs = true;
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inherit name label;
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unsafeDiscardReferences.out = true;
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nativeBuildInputs = [
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erofs-utils
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bubblewrap
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python3Minimal
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]
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++ attrs.nativeBuildInputs or [ ];
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inherit old new erofsArgs;
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}
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)
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''
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mkdir -p store
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python3 << EOF
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import hashlib, json, os, subprocess
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from uuid import UUID
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def uuid_from_node(node: int = 0) -> UUID:
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return UUID(fields=(*((0,) * 5), node))
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out_path = os.environ.get("out")
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default_uuid = uuid_from_node((2**48 - 1) & int.from_bytes(hashlib.sha256(out_path.encode("ascii")).digest()))
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with open(os.environ.get("NIX_ATTRS_JSON_FILE"), mode="r") as f:
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attrs = json.load(f)
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name = attrs["name"]
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with open(attrs["old"], mode="r") as f:
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old_paths = set(ln.rstrip() for ln in f)
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with open(attrs["new"], mode="r") as f:
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new_paths = [ln.rstrip() for ln in f]
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new_paths = [p for p in new_paths if p not in old_paths]
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erofs_args = attrs.get("erofsArgs", [])
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if not any(a.startswith("-U") for a in erofs_args):
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erofs_args.extend(["-U", str(default_uuid)])
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subprocess.run(
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check=True,
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env=os.environ,
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args=[
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"bwrap",
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"--dev-bind", "/", "/",
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"--chdir", os.getcwd(),
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*[a for p in new_paths for a in [f"--ro-bind", p, f"{os.getcwd()}/store/{os.path.basename(p)}"]],
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"--",
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"mkfs.erofs", *attrs.get("erofsArgs", []), out_path, "store",
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],
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)
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EOF
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''
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