$ git clone -n https://src.fedoraproject.org/rpms/ghc-double-conversion.git /var/lib/mock/f38-build-side-42-init-devel-673719-26682/root/chroot_tmpdir/scmroot/ghc-double-conversion
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-673719-26682/root/chroot_tmpdir/scmroot/ghc-double-conversion'...
$ git fetch origin 3466bf9959d841ff8373a1cada440b353f74dbc7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-double-conversion
 * [new ref]         3466bf9959d841ff8373a1cada440b353f74dbc7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3466bf9 Convert to %autorelease and %autochangelog