$ git clone -n https://src.fedoraproject.org/rpms/ghc-th-abstraction.git /var/lib/mock/f41-build-837885-159471/root/chroot_tmpdir/scmroot/ghc-th-abstraction
Cloning into '/var/lib/mock/f41-build-837885-159471/root/chroot_tmpdir/scmroot/ghc-th-abstraction'...
$ git fetch origin 5ffd922e5a67eeb62dcb4c9f20212c79433eaa9d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-th-abstraction
 * [new ref]         5ffd922e5a67eeb62dcb4c9f20212c79433eaa9d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5ffd922 https://hackage.haskell.org/package/th-abstraction-0.5.0.0/changelog