$ git clone -n https://src.fedoraproject.org/rpms/perl-DateTime-HiRes.git /var/lib/mock/f45-build-22933-595/root/chroot_tmpdir/scmroot/perl-DateTime-HiRes
Cloning into '/var/lib/mock/f45-build-22933-595/root/chroot_tmpdir/scmroot/perl-DateTime-HiRes'...
$ git fetch origin 3529e71b215ef197ff8ef4bde40047176e5edce3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-DateTime-HiRes
 * [new ref]         3529e71b215ef197ff8ef4bde40047176e5edce3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3529e71 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild