$ git clone -n https://src.fedoraproject.org/rpms/ghc-haskell-src-exts-util.git /var/lib/mock/f41-build-839418-160145/root/chroot_tmpdir/scmroot/ghc-haskell-src-exts-util
Cloning into '/var/lib/mock/f41-build-839418-160145/root/chroot_tmpdir/scmroot/ghc-haskell-src-exts-util'...
$ git fetch origin c17ba8a8e934118c8e397a503d2f635ed7ab6d44:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-haskell-src-exts-util
 * [new ref]         c17ba8a8e934118c8e397a503d2f635ed7ab6d44 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c17ba8a bump release