$ git clone -n https://src.fedoraproject.org/rpms/perl-rpm-build-perl.git /var/lib/mock/f40-build-778651-130043/root/chroot_tmpdir/scmroot/perl-rpm-build-perl
Cloning into '/var/lib/mock/f40-build-778651-130043/root/chroot_tmpdir/scmroot/perl-rpm-build-perl'...
$ git fetch origin 4be4e515352df375348ad7d6b3529c0ef52c7257:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-rpm-build-perl
 * [new ref]         4be4e515352df375348ad7d6b3529c0ef52c7257 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4be4e51 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild