$ git clone -n https://src.fedoraproject.org/rpms/rust-hashbrown0.12.git /var/lib/mock/f40-build-2082357-49833/root/chroot_tmpdir/scmroot/rust-hashbrown0.12
Cloning into '/var/lib/mock/f40-build-2082357-49833/root/chroot_tmpdir/scmroot/rust-hashbrown0.12'...
$ git fetch origin 3821fde28b8af7853bc917c55cc466f4fbd3d0fa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-hashbrown0.12
 * [new ref]         3821fde28b8af7853bc917c55cc466f4fbd3d0fa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3821fde Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild