$ git clone -n https://src.fedoraproject.org/rpms/perl-Tree.git /var/lib/mock/f45-build-27241-622/root/chroot_tmpdir/scmroot/perl-Tree
Cloning into '/var/lib/mock/f45-build-27241-622/root/chroot_tmpdir/scmroot/perl-Tree'...
$ git fetch origin d5525c1ab5a2f78f27d26cb7e571a32d5eb7fa19:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Tree
 * [new ref]         d5525c1ab5a2f78f27d26cb7e571a32d5eb7fa19 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d5525c1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild