depot/third_party/nixpkgs/pkgs/build-support/mitm-cache/fetch.nix

72 lines
1.4 KiB
Nix

{
lib,
fetchurl,
runCommand,
writeText,
}:
{
name ? "deps",
data,
dontFixup ? true,
...
}@attrs:
let
data' = builtins.removeAttrs (if builtins.isPath data then lib.importJSON data else data) [
"!version"
];
urlToPath =
url:
if lib.hasPrefix "https://" url then
(
let
url' = lib.drop 2 (lib.splitString "/" url);
in
"https/${builtins.concatStringsSep "/" url'}"
)
else
builtins.replaceStrings [ "://" ] [ "/" ] url;
code =
''
mkdir -p "$out"
cd "$out"
''
+ builtins.concatStringsSep "" (
lib.mapAttrsToList (
url: info:
let
key = builtins.head (builtins.attrNames info);
val = info.${key};
path = urlToPath url;
name = baseNameOf path;
source =
{
redirect = "$out/${urlToPath val}";
hash = fetchurl {
inherit url;
hash = val;
};
text = writeText name val;
}
.${key} or (throw "Unknown key: ${url}");
in
''
mkdir -p "${dirOf path}"
ln -s "${source}" "${path}"
''
) data'
);
in
runCommand name (
builtins.removeAttrs attrs [
"name"
"data"
]
// {
passthru = (attrs.passthru or { }) // {
data = writeText "deps.json" (builtins.toJSON data);
};
}
) code