$ git clone -n https://src.fedoraproject.org/rpms/golang-github-openprinting-goipp.git /var/lib/mock/f41-build-1036215-18712/root/chroot_tmpdir/scmroot/golang-github-openprinting-goipp
Cloning into '/var/lib/mock/f41-build-1036215-18712/root/chroot_tmpdir/scmroot/golang-github-openprinting-goipp'...
$ git fetch origin de29e6da0d87c9e41125cc227c83ad0092152c08:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-openprinting-goipp
 * [new ref]         de29e6da0d87c9e41125cc227c83ad0092152c08 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at de29e6d Fix FTBFS