$ git clone -n https://src.fedoraproject.org/rpms/golang-github-shurcool-httpfs.git /var/lib/mock/f41-build-1036359-18724/root/chroot_tmpdir/scmroot/golang-github-shurcool-httpfs
Cloning into '/var/lib/mock/f41-build-1036359-18724/root/chroot_tmpdir/scmroot/golang-github-shurcool-httpfs'...
$ git fetch origin a78aba46ef70d5dd51548687a94879bf8fb8d8ed:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-shurcool-httpfs
 * [new ref]         a78aba46ef70d5dd51548687a94879bf8fb8d8ed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a78aba4 Fix FTBFS