$ git clone -n https://src.fedoraproject.org/rpms/gmime30.git /var/lib/mock/f45-build-11328-429/root/chroot_tmpdir/scmroot/gmime30
Cloning into '/var/lib/mock/f45-build-11328-429/root/chroot_tmpdir/scmroot/gmime30'...
$ git fetch origin 08e35a64f660e4cbc73292851d2bfbfc254ab0a8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gmime30
 * [new ref]         08e35a64f660e4cbc73292851d2bfbfc254ab0a8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 08e35a6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild