$ git clone -n https://src.fedoraproject.org/rpms/rsgain.git /var/lib/mock/f45-build-34675-690/root/chroot_tmpdir/scmroot/rsgain
Cloning into '/var/lib/mock/f45-build-34675-690/root/chroot_tmpdir/scmroot/rsgain'...
$ git fetch origin bdb81478c032b6aebdedb095a3369c914827f255:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rsgain
 * [new ref]         bdb81478c032b6aebdedb095a3369c914827f255 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bdb8147 Rebuilt for FFmpeg 9