$ git clone -n https://src.fedoraproject.org/rpms/rust-hax-lib-macros.git /var/lib/mock/f45-build-42290-792/root/chroot_tmpdir/scmroot/rust-hax-lib-macros
Cloning into '/var/lib/mock/f45-build-42290-792/root/chroot_tmpdir/scmroot/rust-hax-lib-macros'...
$ git fetch origin 20adc90b34311c03d5bf83c356081a4e90ce1871:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-hax-lib-macros
 * [new ref]         20adc90b34311c03d5bf83c356081a4e90ce1871 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 20adc90 initial package (resolves rhbz#2487230)