$ git clone -n https://src.fedoraproject.org/rpms/cosmic-comp.git /var/lib/mock/f41-build-855389-167123/root/chroot_tmpdir/scmroot/cosmic-comp
Cloning into '/var/lib/mock/f41-build-855389-167123/root/chroot_tmpdir/scmroot/cosmic-comp'...
$ git fetch origin 5c1c90ff8a0af65c992993d4f686344b041174a1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cosmic-comp
 * [new ref]         5c1c90ff8a0af65c992993d4f686344b041174a1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5c1c90f Bump cosmic-comp