$ git clone -n https://src.fedoraproject.org/rpms/dub.git /var/lib/mock/f41-build-854719-166949/root/chroot_tmpdir/scmroot/dub
Cloning into '/var/lib/mock/f41-build-854719-166949/root/chroot_tmpdir/scmroot/dub'...
$ git fetch origin bf49324afe8b7ce525f385f9ee4ca1db0e2cffcc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dub
 * [new ref]         bf49324afe8b7ce525f385f9ee4ca1db0e2cffcc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bf49324 Update to 1.38.1