$ git clone -n https://src.fedoraproject.org/rpms/R-gsl.git /var/lib/mock/f40-build-789496-135730/root/chroot_tmpdir/scmroot/R-gsl
Cloning into '/var/lib/mock/f40-build-789496-135730/root/chroot_tmpdir/scmroot/R-gsl'...
$ git fetch origin 27c19a5b08881a4f0d2b063b8a29e96a45c197eb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-gsl
 * [new ref]         27c19a5b08881a4f0d2b063b8a29e96a45c197eb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 27c19a5 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild