$ git clone -n https://src.fedoraproject.org/rpms/rust-pyo3-macros0.19.git /var/lib/mock/f42-build-3273001-41309/root/chroot_tmpdir/scmroot/rust-pyo3-macros0.19
Cloning into '/var/lib/mock/f42-build-3273001-41309/root/chroot_tmpdir/scmroot/rust-pyo3-macros0.19'...
$ git fetch origin b54a23f9603cc836b8bb569ce3753024a5a94ea0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pyo3-macros0.19
 * [new ref]         b54a23f9603cc836b8bb569ce3753024a5a94ea0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b54a23f compat package for obsolete version