$ git clone -n https://src.fedoraproject.org/rpms/golang-x-mobile.git /var/lib/mock/f45-build-12804-443/root/chroot_tmpdir/scmroot/golang-x-mobile
Cloning into '/var/lib/mock/f45-build-12804-443/root/chroot_tmpdir/scmroot/golang-x-mobile'...
$ git fetch origin 03f6d44a3a7127fb51dfb449e084fc67d19ac837:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-x-mobile
 * [new ref]         03f6d44a3a7127fb51dfb449e084fc67d19ac837 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 03f6d44 Fix FTBFS. Update to the latest commit