$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Class.git /var/lib/mock/f45-build-26577-618/root/chroot_tmpdir/scmroot/perl-Test-Class
Cloning into '/var/lib/mock/f45-build-26577-618/root/chroot_tmpdir/scmroot/perl-Test-Class'...
$ git fetch origin 2ea8c133ec4f3fb29ab12b740c5130ca5fae7ea7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Class
 * [new ref]         2ea8c133ec4f3fb29ab12b740c5130ca5fae7ea7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2ea8c13 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild