$ git clone -n https://src.fedoraproject.org/rpms/R-whoami /var/lib/mock/f39-build-1582278-38109/root/chroot_tmpdir/scmroot/R-whoami
Cloning into '/var/lib/mock/f39-build-1582278-38109/root/chroot_tmpdir/scmroot/R-whoami'...
$ git fetch origin 1ef2c85899de7303ce1bba1aa217d075f363dc52:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-whoami
 * [new ref]         1ef2c85899de7303ce1bba1aa217d075f363dc52 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1ef2c85 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild