Fix missing files in git deps due to ripgrep observing .ignore files (#932)

For example, https://github.com/rust-lang/cargo includes a .ignore
file to ignore generated manpages in day-to-day searches. We need
those manpages to build the crate.

It's safe to use `rg -uuu` because it's a fresh checkout, there are no
extra files that .gitignore should be hiding.

---------

Co-authored-by: Ivan Petkov <[email protected]>

Author: cormacrelf

CHANGELOG.md

@@ -12,6 +12,11 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
   `dontStrip = true` builds, but can otherwise be controlled using
   `doRemapPathPrefix`.
 
+### Fixed
+* `downloadCargoPackageFromGit` now correctly includes any files listed in a
+  `.ignore` file (but otherwise not listed in `.gitignore`) when unpacking git
+  checkouts.
+
 ## [0.21.2] - 2025-11-07
 
 ### Changed

lib/downloadCargoPackageFromGit.nix

@@ -105,7 +105,10 @@ stdenv.mkDerivation {
         (
           cd "$(dirname "$cargoToml")"
 
-          crateFiles="$(rg --follow --files --ignore-file=<(
+          # NB: we tell ripgrep to ignore any ignore files (via -uuu) since we are manually
+          # applying the includes/excludes defined in Cargo.toml. Since this is a fresh git
+          # checkout, it will not include any files listed in .gitignore anyway!
+          crateFiles="$(rg -uuu --follow --files --ignore-file=<(
             remarshal -i "$cargoToml" -if toml -of json \
               | jq -r '.package | if has("include") then .include | map("!\(.)" | sub("^!!"; "")) else .exclude // [] end| .[]?'
             echo '!/Cargo.toml'