$ git clone -n https://src.fedoraproject.org/rpms/golang-github-valyala-bytebufferpool.git /var/lib/mock/f45-build-12580-442/root/chroot_tmpdir/scmroot/golang-github-valyala-bytebufferpool
Cloning into '/var/lib/mock/f45-build-12580-442/root/chroot_tmpdir/scmroot/golang-github-valyala-bytebufferpool'...
$ git fetch origin b3da659e6b1abecc6424d869e316ef52e67e09f4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-valyala-bytebufferpool
 * [new ref]         b3da659e6b1abecc6424d869e316ef52e67e09f4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b3da659 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild