$ git clone -n https://src.fedoraproject.org/rpms/perl-Pegex.git /var/lib/mock/f45-build-25717-612/root/chroot_tmpdir/scmroot/perl-Pegex
Cloning into '/var/lib/mock/f45-build-25717-612/root/chroot_tmpdir/scmroot/perl-Pegex'...
$ git fetch origin 6b1fac92105ac4ac876a32fe843d5733d5f0eae9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Pegex
 * [new ref]         6b1fac92105ac4ac876a32fe843d5733d5f0eae9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6b1fac9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild