$ git clone -n https://src.fedoraproject.org/rpms/golang-github-hpcloud-tail.git /var/lib/mock/f40-build-2446113-61286/root/chroot_tmpdir/scmroot/golang-github-hpcloud-tail
Cloning into '/var/lib/mock/f40-build-2446113-61286/root/chroot_tmpdir/scmroot/golang-github-hpcloud-tail'...
$ git fetch origin 8afcfb684418b7b33c165c303332b3e46e7f781f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-hpcloud-tail
 * [new ref]         8afcfb684418b7b33c165c303332b3e46e7f781f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8afcfb6 Replaced by golang-github-nxadm-tail