$ git clone -n https://src.fedoraproject.org/rpms/golang-modernc-ccgo-4.git /var/lib/mock/f40-build-737432-107151/root/chroot_tmpdir/scmroot/golang-modernc-ccgo-4
Cloning into '/var/lib/mock/f40-build-737432-107151/root/chroot_tmpdir/scmroot/golang-modernc-ccgo-4'...
$ git fetch origin aa7386349318466c3a60c3826b1f3552521d7776:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-modernc-ccgo-4
 * [new ref]         aa7386349318466c3a60c3826b1f3552521d7776 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aa73863 Initial import (fedora#2233188)