$ git clone -n https://src.fedoraproject.org/rpms/golang.git /var/lib/mock/f42-build-866103-173709/root/chroot_tmpdir/scmroot/golang
Cloning into '/var/lib/mock/f42-build-866103-173709/root/chroot_tmpdir/scmroot/golang'...
$ git fetch origin b06cd97cc3965c1b2e3fe61645cb83776c657148:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang
 * [new ref]         b06cd97cc3965c1b2e3fe61645cb83776c657148 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b06cd97 Remove TestPIESize patch