$ git clone -n https://src.fedoraproject.org/rpms/perl-Date-ICal.git /var/lib/mock/f45-build-22972-595/root/chroot_tmpdir/scmroot/perl-Date-ICal
Cloning into '/var/lib/mock/f45-build-22972-595/root/chroot_tmpdir/scmroot/perl-Date-ICal'...
$ git fetch origin f88c2acacfb61100e6ef46d58db29543a8614d91:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Date-ICal
 * [new ref]         f88c2acacfb61100e6ef46d58db29543a8614d91 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f88c2ac Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild