$ git clone -n https://src.fedoraproject.org/rpms/golang-x-sys.git /var/lib/mock/f45-build-12801-443/root/chroot_tmpdir/scmroot/golang-x-sys
Cloning into '/var/lib/mock/f45-build-12801-443/root/chroot_tmpdir/scmroot/golang-x-sys'...
$ git fetch origin 209292993593fa68dbe276c4df5d33d2aceea6d8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-x-sys
 * [new ref]         209292993593fa68dbe276c4df5d33d2aceea6d8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2092929 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild