$ git clone -n https://src.fedoraproject.org/rpms/perl-DateTime.git /var/lib/mock/f40-build-763299-122465/root/chroot_tmpdir/scmroot/perl-DateTime
Cloning into '/var/lib/mock/f40-build-763299-122465/root/chroot_tmpdir/scmroot/perl-DateTime'...
$ git fetch origin bf25a9af59e99ba7551088d3d3278686b0dd7b39:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-DateTime
 * [new ref]         bf25a9af59e99ba7551088d3d3278686b0dd7b39 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bf25a9a Update to 1.65 (rhbz#2248104)