$ git clone -n https://src.fedoraproject.org/rpms/cosmic-comp.git /var/lib/mock/f41-build-856477-167635/root/chroot_tmpdir/scmroot/cosmic-comp
Cloning into '/var/lib/mock/f41-build-856477-167635/root/chroot_tmpdir/scmroot/cosmic-comp'...
$ git fetch origin 6e4e4fa56df46d2ff9e787ee10144eb24e4dcfb0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cosmic-comp
 * [new ref]         6e4e4fa56df46d2ff9e787ee10144eb24e4dcfb0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6e4e4fa Update to 1.0.0~alpha.2