$ git clone -n https://src.fedoraproject.org/rpms/perl-UUID-Tiny.git /var/lib/mock/f45-build-27344-622/root/chroot_tmpdir/scmroot/perl-UUID-Tiny
Cloning into '/var/lib/mock/f45-build-27344-622/root/chroot_tmpdir/scmroot/perl-UUID-Tiny'...
$ git fetch origin e4db8579206c486ad6a8c0aec7d6164185fd37bf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-UUID-Tiny
 * [new ref]         e4db8579206c486ad6a8c0aec7d6164185fd37bf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e4db857 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild