$ git clone -n https://src.fedoraproject.org/rpms/perl-Math-GMP.git /var/lib/mock/f42-build-876693-179772/root/chroot_tmpdir/scmroot/perl-Math-GMP
Cloning into '/var/lib/mock/f42-build-876693-179772/root/chroot_tmpdir/scmroot/perl-Math-GMP'...
$ git fetch origin aebea019102337d5b9d5b4458d91c8f2795feff1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Math-GMP
 * [new ref]         aebea019102337d5b9d5b4458d91c8f2795feff1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aebea01 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild