$ git clone -n https://src.fedoraproject.org/rpms/ghc-http-client.git /var/lib/mock/f38-build-side-42-init-devel-837334-28399/root/chroot_tmpdir/scmroot/ghc-http-client
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-837334-28399/root/chroot_tmpdir/scmroot/ghc-http-client'...
$ git fetch origin 2dec2b8685d2307d412e9e767fc10d49021fccf1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-http-client
 * [new ref]         2dec2b8685d2307d412e9e767fc10d49021fccf1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2dec2b8 Convert to %autorelease and %autochangelog