$ git clone -n https://src.fedoraproject.org/rpms/rust-migrations_macros.git /var/lib/mock/f45-build-43226-801/root/chroot_tmpdir/scmroot/rust-migrations_macros
Cloning into '/var/lib/mock/f45-build-43226-801/root/chroot_tmpdir/scmroot/rust-migrations_macros'...
$ git fetch origin f7981e49deb9cd05ea24a9cd3fd33a2b69c331c2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-migrations_macros
 * [new ref]         f7981e49deb9cd05ea24a9cd3fd33a2b69c331c2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f7981e4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild