$ git clone -n https://src.fedoraproject.org/rpms/libxcrypt.git /var/lib/mock/f45-build-42214-791/root/chroot_tmpdir/scmroot/libxcrypt
Cloning into '/var/lib/mock/f45-build-42214-791/root/chroot_tmpdir/scmroot/libxcrypt'...
$ git fetch origin 7313a047b4b8d7956913c3236c6273aea5d16a55:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libxcrypt
 * [new ref]         7313a047b4b8d7956913c3236c6273aea5d16a55 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7313a04 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild