$ git clone -n https://src.fedoraproject.org/rpms/perl-Math-Libm.git /var/lib/mock/f42-build-876697-179772/root/chroot_tmpdir/scmroot/perl-Math-Libm
Cloning into '/var/lib/mock/f42-build-876697-179772/root/chroot_tmpdir/scmroot/perl-Math-Libm'...
$ git fetch origin 470e88596915625423b489a64c4c2ef137f47b23:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Math-Libm
 * [new ref]         470e88596915625423b489a64c4c2ef137f47b23 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 470e885 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild