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libexpr/fetchurl.nix: allow __impure fetch

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This commit adds an optional `__impure` parameter to fetchurl.nix, which allows
the caller to use `libfetcher`'s fetcher in an impure derivation.  This allows
nixpkgs' patch-normalizing fetcher (fetchpatch) to be rewritten to use nix's
internal fetchurl, thereby eliminating the awkward "you can't use fetchpatch
here" banners scattered all over the place.

See also: https://github.com/NixOS/nixpkgs/pull/188587
This commit is contained in:
Adam Joseph 2022-09-16 00:47:54 -07:00
parent 88a45d6149
commit b3550d9179
1 changed files with 5 additions and 3 deletions
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8
src/libexpr/fetchurl.nix
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@ -12,13 +12,13 @@
, executable ? false
, unpack ? false
, name ? baseNameOf (toString url)
, __impure ? false
}:
derivation {
derivation ({
builder = "builtin:fetchurl";
# New-style output content requirements.
inherit outputHashAlgo outputHash;
outputHashMode = if unpack || executable then "recursive" else "flat";
inherit name url executable unpack;
@ -38,4 +38,6 @@ derivation {
# To make "nix-prefetch-url" work.
urls = [ url ];
}
} // (if __impure
then { inherit __impure; }
else { inherit outputHashAlgo outputHash; }))