$ git clone -n https://src.fedoraproject.org/rpms/fetchmail.git /var/lib/mock/f45-build-8921-397/root/chroot_tmpdir/scmroot/fetchmail
Cloning into '/var/lib/mock/f45-build-8921-397/root/chroot_tmpdir/scmroot/fetchmail'...
$ git fetch origin 7b0aa7054a0a97145736fe001fa1a98d79d9133c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fetchmail
 * [new ref]         7b0aa7054a0a97145736fe001fa1a98d79d9133c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7b0aa70 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild