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Add inputs.self.submodules flake attribute

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This allows a flake to specify that it needs Git submodules to be
enabled (or disabled, if we ever change the default) on the top-level
flake. This requires the input to be refetched, but since the first
fetch is lazy, this shouldn't be expensive.

Currently the only attribute allowed by `inputs.self` is `submodules`,
but more can be added in the future (e.g. a `lazy` attribute to opt in
to lazy tree behaviour).

Fixes #5312, #9842.
This commit is contained in:
Eelco Dolstra 2025-02-04 20:51:14 +01:00
parent 01598487b7
commit 25fcc8d1ab
3 changed files with 128 additions and 48 deletions
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14
tests/functional/flakes/flake-in-submodule.sh
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@ -77,6 +77,20 @@ git -C "$rootRepo" commit -m "Add flake.nix"
storePath=$(nix flake prefetch --json "$rootRepo?submodules=1" | jq -r .storePath)
[[ -e "$storePath/submodule" ]]
# Test the use of inputs.self.
cat > "$rootRepo"/flake.nix <<EOF
{
inputs.self.submodules = true;
outputs = { self }: {
foo = self.outPath;
};
}
EOF
git -C "$rootRepo" commit -a -m "Bla"
storePath=$(nix eval --raw "$rootRepo#foo")
[[ -e "$storePath/submodule" ]]
# The root repo may use the submodule repo as an input
# through the relative path. This may change in the future;
# see: https://discourse.nixos.org/t/57783 and #9708.