$ git clone -n https://src.fedoraproject.org/rpms/ghc-aeson-yaml.git /var/lib/mock/f38-build-side-42-init-devel-1027729-29693/root/chroot_tmpdir/scmroot/ghc-aeson-yaml
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1027729-29693/root/chroot_tmpdir/scmroot/ghc-aeson-yaml'...
$ git fetch origin 1f7b24443cd4ab2876c8180ee3007f8e56f6807d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-aeson-yaml
 * [new ref]         1f7b24443cd4ab2876c8180ee3007f8e56f6807d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1f7b244 Convert to %autorelease and %autochangelog