$ git clone -n https://src.fedoraproject.org/rpms/emerald-themes.git /var/lib/mock/f45-build-8150-377/root/chroot_tmpdir/scmroot/emerald-themes
Cloning into '/var/lib/mock/f45-build-8150-377/root/chroot_tmpdir/scmroot/emerald-themes'...
$ git fetch origin 2f60c8a17b64a83d003bc2be20f1ef82ccd22064:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/emerald-themes
 * [new ref]         2f60c8a17b64a83d003bc2be20f1ef82ccd22064 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2f60c8a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild