$ git clone -n https://src.fedoraproject.org/rpms/ghc-http-client.git /var/lib/mock/f40-build-2208151-52110/root/chroot_tmpdir/scmroot/ghc-http-client
Cloning into '/var/lib/mock/f40-build-2208151-52110/root/chroot_tmpdir/scmroot/ghc-http-client'...
$ git fetch origin 81a8d7602271d8a8bc6ba267388fd9c7fd335c82:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-http-client
 * [new ref]         81a8d7602271d8a8bc6ba267388fd9c7fd335c82 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 81a8d76 bump release