$ git clone -n https://src.fedoraproject.org/rpms/gsl.git /var/lib/mock/f40-build-2003311-44828/root/chroot_tmpdir/scmroot/gsl
Cloning into '/var/lib/mock/f40-build-2003311-44828/root/chroot_tmpdir/scmroot/gsl'...
$ git fetch origin 71b7f187603b7988dc6522461076228f3a31b9f8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gsl
 * [new ref]         71b7f187603b7988dc6522461076228f3a31b9f8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 71b7f18 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild