# This expression returns a list of all fetchurl calls used by ‘expr’.
{
expr,
lib ? import ../../lib,
}:
let
inherit (lib)
addErrorContext
attrNames
concatLists
const
filter
genericClosure
isAttrs
isDerivation
isList
mapAttrsToList
optional
optionals
;
root = expr;
uniqueFiles = map (x: x.file) (genericClosure {
startSet = map (file: {
key = with file; (if type == null then "" else type + "+") + hash;
inherit file;
}) files;
operator = const [ ];
});
files = map (drv: {
urls = drv.urls or [ drv.url ];
hash = drv.outputHash;
isPatch = (drv ? postFetch && drv.postFetch != "");
type = drv.outputHashAlgo;
name = drv.name;
}) fetchurlDependencies;
fetchurlDependencies = filter (
drv:
drv.outputHash or "" != "" && drv.outputHashMode or "flat" == "flat" && (drv ? url || drv ? urls)
) dependencies;
dependencies = map (x: x.value) (genericClosure {
startSet = map keyDrv (derivationsIn' root);
operator = { key, value }: map keyDrv (immediateDependenciesOf value);
derivationsIn' =
x:
if !canEval x then
[ ]
else if isDerivation x then
optional (canEval x.drvPath) x
else if isList x then
concatLists (map derivationsIn' x)
else if isAttrs x then
concatLists (
mapAttrsToList (n: v: addErrorContext "while finding tarballs in '${n}':" (derivationsIn' v)) x
)
else
[ ];
keyDrv =
if canEval drv.drvPath then
key = drv.drvPath;
value = drv;
}
{ };
immediateDependenciesOf =
mapAttrsToList (n: v: derivationsIn v) (
removeAttrs drv (
[
"meta"
"passthru"
]
++ optionals (drv ? passthru) (attrNames drv.passthru)
);
derivationsIn =
concatLists (map derivationsIn x)
canEval = val: (builtins.tryEval val).success;
in
uniqueFiles