$ git clone -n https://src.fedoraproject.org/rpms/rust-alga.git /var/lib/mock/f41-build-side-1-2784269-32559/root/chroot_tmpdir/scmroot/rust-alga
Cloning into '/var/lib/mock/f41-build-side-1-2784269-32559/root/chroot_tmpdir/scmroot/rust-alga'...
$ git fetch origin b33f99f98ce76f2299acd360846495cc6a41be6a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-alga
 * [new ref]         b33f99f98ce76f2299acd360846495cc6a41be6a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b33f99f Include patch to fix doctests with Rust 1.80+