$ git clone -n https://src.fedoraproject.org/rpms/perl-Chart.git /var/lib/mock/f45-build-22261-590/root/chroot_tmpdir/scmroot/perl-Chart
Cloning into '/var/lib/mock/f45-build-22261-590/root/chroot_tmpdir/scmroot/perl-Chart'...
$ git fetch origin e70cb4f1ecacb943456e2c7deaad2aa1237ed92f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Chart
 * [new ref]         e70cb4f1ecacb943456e2c7deaad2aa1237ed92f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e70cb4f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild