create rootfs/ and metadata.json

[#112715265]

Signed-off-by: Corbin Halliwill <challiwill@pivotal.io>

.gitignore

@@ -1 +1,4 @@
 assets/check
+assets/print-metadata
+bin/
+tar-src/

Dockerfile

@@ -14,3 +14,5 @@ RUN /usr/local/bin/docker --version
 
 ADD assets/ /opt/resource/
 RUN chmod +x /opt/resource/*
+
+ADD bin/ /bin/

assets/in

@@ -56,9 +56,17 @@ if [ "$skip_download" = "false" ]; then
 
   docker save -o ${destination}/image "$image_name"
 
+  docker run \
+    --cidfile=/tmp/container.cid \
+    -v /opt/resource/print-metadata:/tmp/print-metadata \
+    "$image_name" \
+    /tmp/print-metadata > ${destination}/metadata.json
+
+  mkdir -p ${destination}/rootfs/
+  docker export $(cat /tmp/container.cid) | tar -xf - -C ${destination}/rootfs/
+
   if [ "$rootfs" = "true" ]; then
-    docker run --cidfile=container.cid "$image_name" echo container created
-    docker export $(cat container.cid) > ${destination}/rootfs.tar
+    docker export $(cat /tmp/container.cid) > ${destination}/rootfs.tar
   fi
 fi
 

ci/scripts/build

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 set -e -x
 
@@ -9,5 +9,21 @@ cd $(dirname $0)/../..
 export GOPATH=$PWD/Godeps/_workspace:$GOPATH
 
 go build -o ./assets/check ./cmd/check/
+go build -o ./assets/print-metadata ./cmd/print-metadata/
+
+if [ ! -e bin/tar ]; then
+  if [ ! -e tar-src ]; then
+    curl https://ftp.gnu.org/gnu/tar/tar-1.28.tar.gz | tar zxf -
+    mv tar-1.28 tar-src
+  fi
+
+  mkdir -p bin/
+
+  pushd tar-src/
+    FORCE_UNSAFE_CONFIGURE=1 ./configure
+    make LDFLAGS=-static
+    cp src/tar ../bin
+  popd
+fi
 
 cp -a ./* ${BUILT_RESOURCE}/

cmd/print-metadata/main.go

@@ -0,0 +1,30 @@
+package main
+
+import (
+	"encoding/json"
+	"os"
+)
+
+type imageMetadata struct {
+	Env []string `json:"env"`
+}
+
+var blacklistedEnv = map[string]bool{
+	"HOSTNAME": true,
+}
+
+func main() {
+	var envVars []string
+	for _, e := range os.Environ() {
+		if !blacklistedEnv[e] {
+			envVars = append(envVars, e)
+		}
+	}
+
+	err := json.NewEncoder(os.Stdout).Encode(imageMetadata{
+		Env: envVars,
+	})
+	if err != nil {
+		panic(err)
+	}
+}