buildRustCrate: Fix `include` filter

buildRustCrate has a handy `include` helper, that only imports those whitelisted
files and folders to the store.

However, the function's matching logic is broken and includes all files,
regardless of whether or not they're whitelisted, as long as the whitelist
contains at least one name (regardless of whether that name exists). This is
because it doesn't take into account that
`lib.strings.removePrefix "foo" "bar" == "bar"` (that is, paths that don't match
the prefix are passed straight through).

1 files changed, 1 insertions, 2 deletions

diff --git a/pkgs/build-support/rust/build-rust-crate/helpers.nix b/pkgs/build-support/rust/build-rust-crate/helpers.nix
index 8a0a62434ec0..14d997b2d5cf 100644
--- a/pkgs/build-support/rust/build-rust-crate/helpers.nix
+++ b/pkgs/build-support/rust/build-rust-crate/helpers.nix
@@ -14,9 +14,8 @@
   include = includedFiles: src: builtins.filterSource (path: type:
      lib.lists.any (f:
        let p = toString (src + ("/" + f));
-           suff = lib.strings.removePrefix p path;
        in
-       suff == "" || (lib.strings.hasPrefix "/" suff)
+       p == path || (lib.strings.hasPrefix (p + "/") path)
      ) includedFiles
   ) src;
   exclude = excludedFiles: src: builtins.filterSource (path: type: