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{ lib, fetchgit, formats }:
with lib;
let
json = formats.json { };
in rec {
# Derive a pin file from workspace state.
mkPinFile = workspaceState:
assert workspaceState.version >= 5 && workspaceState.version <= 6;
json.generate "Package.resolved" {
version = 1;
object.pins = map (dep: {
package = dep.packageRef.name;
repositoryURL = dep.packageRef.location;
state = dep.state.checkoutState;
}) workspaceState.object.dependencies;
};
# Make packaging helpers from swiftpm2nix generated output.
helpers = generated: let
inherit (import generated) workspaceStateFile hashes;
workspaceState = lib.importJSON workspaceStateFile;
pinFile = mkPinFile workspaceState;
in rec {
# Create fetch expressions for dependencies.
sources = listToAttrs (
map (dep: nameValuePair dep.subpath (fetchgit {
url = dep.packageRef.location;
rev = dep.state.checkoutState.revision;
sha256 = hashes.${dep.subpath};
})) workspaceState.object.dependencies
);
# Configure phase snippet for use in packaging.
configure = ''
mkdir -p .build/checkouts
ln -sf ${pinFile} ./Package.resolved
install -m 0600 ${workspaceStateFile} ./.build/workspace-state.json
''
+ concatStrings (mapAttrsToList (name: src: ''
ln -s '${src}' '.build/checkouts/${name}'
'') sources)
+ ''
# Helper that makes a swiftpm dependency mutable by copying the source.
swiftpmMakeMutable() {
local orig="$(readlink .build/checkouts/$1)"
rm .build/checkouts/$1
cp -r "$orig" .build/checkouts/$1
chmod -R u+w .build/checkouts/$1
}
'';
};
}
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