atuin: make cargoHash the same on Linux and Darwin (#371272)

pkgs/by-name/at/atuin/package.nix

@@ -5,6 +5,8 @@
   installShellFiles,
   rustPlatform,
   nixosTests,
+  jq,
+  moreutils,
 }:
 
 rustPlatform.buildRustPackage rec {
@@ -18,12 +20,34 @@ rustPlatform.buildRustPackage rec {
     hash = "sha256-P/q4XYhpXo9kwiltA0F+rQNSlqI+s8TSi5v5lFJWJ/4=";
   };
 
-  # TODO: unify this to one hash because updater do not support this
-  cargoHash =
-    if stdenv.hostPlatform.isLinux then
-      "sha256-JDm7HWMaLSodpOhrR7rm6ZS/ATX/q8fRK+OJ/EKqg3U="
-    else
-      "sha256-mrsqaqJHMyNi3yFDIyAXFBS+LY71VWXE8O7mjvgI6lo=";
+  # the interim crate contains both README.md and readme.md,
+  # which causes a hash mismatch on systems with a case-insensitive filesystem.
+  # This removes the readme files and updates cargo's checksum file accordingly
+  depsExtraArgs = {
+    nativeBuildInputs = [
+      jq
+      moreutils
+    ];
+
+    postBuild = ''
+      pushd $name/interim
+
+      if [ -e readme.md ]; then
+        rm --force --verbose README.md readme.md
+        jq 'del(.files."README.md") | del(.files."readme.md")' \
+          .cargo-checksum.json -c \
+          | sponge .cargo-checksum.json
+
+        popd
+      else
+        echo "ERROR: the interim crate has been updated"
+        echo "When you see this message, please remove the workaround for the interim crate from the atuin nix expression"
+        exit 1
+      fi
+    '';
+  };
+
+  cargoHash = "sha256-l8DsQwEJZL9kr9UIpZzebDSRYET2WM8VFwk+O1Qk9oQ=";
 
   # atuin's default features include 'check-updates', which do not make sense
   # for distribution builds. List all other default features.