$ git clone -n https://src.fedoraproject.org/rpms/perl-Class-Base.git /var/lib/mock/f45-build-22310-590/root/chroot_tmpdir/scmroot/perl-Class-Base
Cloning into '/var/lib/mock/f45-build-22310-590/root/chroot_tmpdir/scmroot/perl-Class-Base'...
$ git fetch origin fdc718d11590c7869f31413f1a04b654fa864f2f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Class-Base
 * [new ref]         fdc718d11590c7869f31413f1a04b654fa864f2f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fdc718d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild