$ git clone -n https://src.fedoraproject.org/rpms/rust-url.git /var/lib/mock/f40-build-2271489-54888/root/chroot_tmpdir/scmroot/rust-url
Cloning into '/var/lib/mock/f40-build-2271489-54888/root/chroot_tmpdir/scmroot/rust-url'...
$ git fetch origin b4348870b829c0e3569abffaee1316a52731711d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-url
 * [new ref]         b4348870b829c0e3569abffaee1316a52731711d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b434887 Update to version 2.5.0; Fixes RHBZ#2251081