$ git clone -n https://src.fedoraproject.org/rpms/golang-modernc-lex.git /var/lib/mock/f45-build-20267-569/root/chroot_tmpdir/scmroot/golang-modernc-lex
Cloning into '/var/lib/mock/f45-build-20267-569/root/chroot_tmpdir/scmroot/golang-modernc-lex'...
$ git fetch origin 137380ee65d584ab0a1d1925ae2926ea92aaba44:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-modernc-lex
 * [new ref]         137380ee65d584ab0a1d1925ae2926ea92aaba44 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 137380e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild