$ git clone -n https://src.fedoraproject.org/rpms/golang-github-ncw-swift.git /var/lib/mock/f41-build-1036159-18708/root/chroot_tmpdir/scmroot/golang-github-ncw-swift
Cloning into '/var/lib/mock/f41-build-1036159-18708/root/chroot_tmpdir/scmroot/golang-github-ncw-swift'...
$ git fetch origin f9c9a0f51c0eb8bae9485228b54fedced4acc275:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-ncw-swift
 * [new ref]         f9c9a0f51c0eb8bae9485228b54fedced4acc275 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f9c9a0f Fix FTBFS