importCargoLock: add support for patches

Motivation https://www.github.com/nix-community/nixpkgs-wayland/issues/461#issuecomment-2294113236

This fixes the lockfile mismatch which happens when `cargoPatches` is used with
`cargoLock` because those patches are added to `patches`.

pkgs/build-support/rust/import-cargo-lock.nix

@@ -1,4 +1,4 @@
-{ fetchgit, fetchurl, lib, writers, python3Packages, runCommand, cargo, jq }:
+{ fetchgit, fetchurl, lib, writers, python3Packages, runCommand, applyPatches, writeTextFile, cargo, jq }:
 
 {
  # Cargo lock file
@@ -7,6 +7,9 @@
  # Cargo lock file contents as string
 , lockFileContents ? null
 
+ # Applying patches requires IFD thus cannot be used in nixpkgs.
+, patches ? null
+
  # Allow `builtins.fetchGit` to be used to not require hashes for git dependencies
 , allowBuiltinFetchGit ? false
 
@@ -41,12 +44,34 @@ let
  sha = builtins.elemAt parts 4;
  } // lib.optionalAttrs (type != null) { inherit type value; };
 
- # shadows args.lockFileContents
- lockFileContents =
- if lockFile != null
- then builtins.readFile lockFile
+ lockFileContents' =
+ if args.lockFile != null
+ then builtins.readFile args.lockFile
  else args.lockFileContents;
 
+ lockFile' = (
+ applyPatches {
+ name = "cargo-lockFileContents-patched";
+ inherit patches;
+ unpackPhase = "cp $src ./Cargo.lock && chmod +w Cargo.lock";
+ installPhase = "cp ./Cargo.lock $out";
+ src =
+ if args.lockFile != null then
+ args.lockFile
+ else
+ writeTextFile {
+ name = "cargo-lockFileContents";
+ text = lockFileContents';
+ };
+ }
+ );
+
+ # shadows args.lockFile
+ lockFile = if patches != null then lockFile' else args.lockFile;
+ # shadows args.lockFileContents
+ # If `patches` is specified then `readFIle lockFile` will use IFD
+ lockFileContents = if patches != null then builtins.readFile lockFile else lockFileContents';
+
  parsedLockFile = builtins.fromTOML lockFileContents;
 
  packages = parsedLockFile.package;