$ git clone -n https://src.fedoraproject.org/rpms/golang-github-valyala-fasthttp.git /var/lib/mock/f39-build-1505105-35105/root/chroot_tmpdir/scmroot/golang-github-valyala-fasthttp
Cloning into '/var/lib/mock/f39-build-1505105-35105/root/chroot_tmpdir/scmroot/golang-github-valyala-fasthttp'...
$ git fetch origin 5840f4da2a66223a30261e06e9957070868d0b68:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-valyala-fasthttp
 * [new ref]         5840f4da2a66223a30261e06e9957070868d0b68 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5840f4d Update to 1.48.0