$ git clone -n https://src.fedoraproject.org/rpms/rust-pyo3-macros-backend0.19.git /var/lib/mock/f42-build-3348062-45005/root/chroot_tmpdir/scmroot/rust-pyo3-macros-backend0.19
Cloning into '/var/lib/mock/f42-build-3348062-45005/root/chroot_tmpdir/scmroot/rust-pyo3-macros-backend0.19'...
$ git fetch origin 5e3b51113fed5238e4b3f30f050883c9a37d97cc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pyo3-macros-backend0.19
 * [new ref]         5e3b51113fed5238e4b3f30f050883c9a37d97cc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5e3b511 compat package for obsolete version