$ git clone -n https://src.fedoraproject.org/rpms/perl-User.git /var/lib/mock/f45-build-27350-622/root/chroot_tmpdir/scmroot/perl-User
Cloning into '/var/lib/mock/f45-build-27350-622/root/chroot_tmpdir/scmroot/perl-User'...
$ git fetch origin 2fd20dc4c03d5182f5e5518427c406bd3012bbf0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-User
 * [new ref]         2fd20dc4c03d5182f5e5518427c406bd3012bbf0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2fd20dc Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild