Update img plan

Remove scaffolding since it's broken
embed runc statically

Signed-off-by: Elliott Davis <elliott@excellent.io>

img/plan.sh

@@ -1,20 +1,44 @@
 pkg_name="img"
 pkg_origin="core"
-pkg_version=0.3.0
+pkg_version=0.4.6
 pkg_description="Standalone, daemon-less, unprivileged Dockerfile and OCI compatible container image builder."
 pkg_upstream_url="https://github.com/genuinetools/img"
 pkg_license=('MIT')
 pkg_maintainer="The Habitat Maintainers <humans@habitat.sh>"
 pkg_source="https://github.com/genuinetools/img"
-pkg_shasum="37fb69555f178370a67568e0004c7e67a048673fd26e7ab29e327c3ccdb57ace"
 pkg_bin_dirs=(bin)
-pkg_scaffolding=core/scaffolding-go
-pkg_deps=(core/runc core/git core/pkg-config core/libseccomp)
+pkg_deps=(core/git core/pkg-config core/libseccomp)
+pkg_build_deps=(core/go core/git core/dep core/make core/gcc)
+
+export GOPATH="${HAB_CACHE_SRC_PATH}/go"
+export workspace_src="${GOPATH}/src"
+export base_path="github.com/genuinetools"
+export pkg_cache_path="${workspace_src}/${base_path}/${pkg_name}"
+
+do_before() {
+  rm -rf "$pkg_cache_path"
+  mkdir -p "$pkg_cache_path"
+}
+
+do_download() {
+  git clone https://github.com/genuinetools/img "$pkg_cache_path"
+}
+
+do_verify() {
+  return 0
+}
+
+do_unpack() {
+  return 0
+}
 
 do_build() {
-  export PATH="$PATH:$GOPATH/bin"
-  pushd "$scaffolding_go_pkg_path" >/dev/null
-  make clean
+  export PATH="$PATH:${GOPATH}/bin"
+  pushd "${pkg_cache_path}" >/dev/null
   make static
   popd >/dev/null
 }
+
+do_install() {
+  cp -r "${pkg_cache_path}/img" "${pkg_prefix}/bin/${bin}"
+}