$ git clone -n https://src.fedoraproject.org/rpms/perl-Class-C3.git /var/lib/mock/f45-build-22308-590/root/chroot_tmpdir/scmroot/perl-Class-C3
Cloning into '/var/lib/mock/f45-build-22308-590/root/chroot_tmpdir/scmroot/perl-Class-C3'...
$ git fetch origin f8a45179e4856d9cceddd2f56995862330b769f4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Class-C3
 * [new ref]         f8a45179e4856d9cceddd2f56995862330b769f4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f8a4517 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild