$ git clone -n https://src.fedoraproject.org/rpms/gscan2pdf.git /var/lib/mock/f39-build-1704275-41218/root/chroot_tmpdir/scmroot/gscan2pdf
Cloning into '/var/lib/mock/f39-build-1704275-41218/root/chroot_tmpdir/scmroot/gscan2pdf'...
$ git fetch origin 6b6eebf728c7481e69af0cad29ada6a658bd1721:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gscan2pdf
 * [new ref]         6b6eebf728c7481e69af0cad29ada6a658bd1721 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6b6eebf Adapt to deprecated smart match in Perl 5.38.0