$ git clone -n https://src.fedoraproject.org/rpms/golang-github-segmentio-asm.git /var/lib/mock/f45-build-12469-442/root/chroot_tmpdir/scmroot/golang-github-segmentio-asm
Cloning into '/var/lib/mock/f45-build-12469-442/root/chroot_tmpdir/scmroot/golang-github-segmentio-asm'...
$ git fetch origin bbaeb4940cca5328e24902bd46e32a6c61a2c616:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-segmentio-asm
 * [new ref]         bbaeb4940cca5328e24902bd46e32a6c61a2c616 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bbaeb49 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild