$ git clone -n https://src.fedoraproject.org/rpms/ghc-blaze-html.git /var/lib/mock/f39-build-1965551-43292/root/chroot_tmpdir/scmroot/ghc-blaze-html
Cloning into '/var/lib/mock/f39-build-1965551-43292/root/chroot_tmpdir/scmroot/ghc-blaze-html'...
$ git fetch origin 01625cbc5c1aeb42b84a7ac49dc4fc7ecee2f8a2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-blaze-html
 * [new ref]         01625cbc5c1aeb42b84a7ac49dc4fc7ecee2f8a2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 01625cb revised .cabal file