$ git clone -n https://src.fedoraproject.org/rpms/ghc-url.git /var/lib/mock/f38-build-side-42-init-devel-967893-28808/root/chroot_tmpdir/scmroot/ghc-url
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-967893-28808/root/chroot_tmpdir/scmroot/ghc-url'...
$ git fetch origin 27bc93b95ecbfc6a8c913cb1ff99d1d83c36116a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-url
 * [new ref]         27bc93b95ecbfc6a8c913cb1ff99d1d83c36116a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 27bc93b Convert to %autorelease and %autochangelog