$ git clone -n https://src.fedoraproject.org/rpms/rust-cmac.git /var/lib/mock/f45-build-40846-776/root/chroot_tmpdir/scmroot/rust-cmac
Cloning into '/var/lib/mock/f45-build-40846-776/root/chroot_tmpdir/scmroot/rust-cmac'...
$ git fetch origin f48847bdef5e529beb93d9b08658dca05fc7371f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cmac
 * [new ref]         f48847bdef5e529beb93d9b08658dca05fc7371f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f48847b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild