treewide: fix sourceRoot for fetchgit-based src

According to Nixpkgs manual[1] and NixOS 23.11 Release Note[2], the
`sourceRoot` attribute passed to `stdenv.mkDerivation` should be
specified as `"${src.name}"` or `"${src.name}/subdir"` when `src` is
produced using `fetchgit`-based fetchers.

`sourceRoot = "source"` or `sourceRoot = "source/subdir"` is based on
the assumption that the `name` attribute of these pre-unpacked fetchers
are always `"source"`, which is not the case. Expecting constant `name`
also makes the source FODs prone to irrelevent hashes during version
bumps.

[1]: https://nixos.org/manual/nixpkgs/unstable/#var-stdenv-sourceRoot
[2]: https://nixos.org/manual/nixos/stable/release-notes#sec-release-23.11

1 files changed, 1 insertions, 1 deletions

diff --git a/pkgs/development/libraries/mpfi/default.nix b/pkgs/development/libraries/mpfi/default.nix
index 4bc568523c9f2..54abf134d3660 100644
--- a/pkgs/development/libraries/mpfi/default.nix
+++ b/pkgs/development/libraries/mpfi/default.nix
@@ -19,7 +19,7 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-aj/QmJ38ifsW36JFQcbp55aIQRvOpiqLHwEh/aFXsgo=";
   };
 
-  sourceRoot = "source/mpfi";
+  sourceRoot = "${src.name}/mpfi";
 
   nativeBuildInputs = [ autoreconfHook texinfo ];
   buildInputs = [ mpfr ];