$ git clone -n https://src.fedoraproject.org/rpms/perl-Dist-Milla.git /var/lib/mock/f45-build-23209-596/root/chroot_tmpdir/scmroot/perl-Dist-Milla
Cloning into '/var/lib/mock/f45-build-23209-596/root/chroot_tmpdir/scmroot/perl-Dist-Milla'...
$ git fetch origin c01044325de6f9a10157efb05036494e17b353db:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Dist-Milla
 * [new ref]         c01044325de6f9a10157efb05036494e17b353db -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c010443 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild