$ git clone -n https://src.fedoraproject.org/forks/hypersa/rpms/ghc-http-common.git /var/lib/mock/f39-build-2225316-52817/root/chroot_tmpdir/scmroot/ghc-http-common
Cloning into '/var/lib/mock/f39-build-2225316-52817/root/chroot_tmpdir/scmroot/ghc-http-common'...
$ git fetch origin 0c4415e64a5b38a28dc918a8c66d0519d02e1752:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/forks/hypersa/rpms/ghc-http-common
 * [new ref]         0c4415e64a5b38a28dc918a8c66d0519d02e1752 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0c4415e rv64 rebuild