$ git clone -n https://src.fedoraproject.org/rpms/golang-github-remyoudompheng-bigfft.git /var/lib/mock/f41-build-1318706-23516/root/chroot_tmpdir/scmroot/golang-github-remyoudompheng-bigfft
Cloning into '/var/lib/mock/f41-build-1318706-23516/root/chroot_tmpdir/scmroot/golang-github-remyoudompheng-bigfft'...
$ git fetch origin de02a3530280b776b39e77cbc6dbf52bb58c1c37:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-remyoudompheng-bigfft
 * [new ref]         de02a3530280b776b39e77cbc6dbf52bb58c1c37 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at de02a35 Fix FTBFS