$ git clone -n https://src.fedoraproject.org/rpms/R-showtext.git /var/lib/mock/f40-build-1930431-25111/root/chroot_tmpdir/scmroot/R-showtext
Cloning into '/var/lib/mock/f40-build-1930431-25111/root/chroot_tmpdir/scmroot/R-showtext'...
$ git fetch origin b9283f93cc3c92b6fc05389908141398c6726e35:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-showtext
 * [new ref]         b9283f93cc3c92b6fc05389908141398c6726e35 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b9283f9 R-maint-sig mass rebuild