http2 curl

Signed-off-by: Jess Frazelle <me@jessfraz.com>

curl/Dockerfile

@@ -1,12 +1,47 @@
-# curl in a container
 #
-# docker run --rm -it \
-# 	jess/curl -sSL https://check.torproject.org/api/ip
+# This Dockerfile builds a recent curl with HTTP/2 client support, using
+# a recent nghttp2 build.
+#
+# See the Makefile for how to tag it. If Docker and that image is found, the
+# Go tests use this curl binary for integration tests.
 #
-FROM alpine:latest
-MAINTAINER Jessica Frazelle <jess@docker.com>
 
-RUN apk --no-cache add \
-	curl
+FROM alpine:edge
 
-CMD [ "curl" ]
+RUN apk add --no-cache \
+	ca-certificates \
+	nghttp2 \
+	openssl
+
+ENV CURL_VERSION 7.50.1
+
+RUN set -x \
+    && apk add --no-cache --virtual .build-deps \
+		g++ \
+		make \
+		nghttp2-dev \
+		openssl-dev \
+		perl \
+	&& wget https://curl.haxx.se/download/curl-$CURL_VERSION.tar.bz2 \
+    && tar xjvf curl-$CURL_VERSION.tar.bz2 \
+    && rm curl-$CURL_VERSION.tar.bz2 \
+    && ( \
+		cd curl-$CURL_VERSION \
+    	&& ./configure \
+    		--with-nghttp2=/usr \
+        	--with-ssl \
+        	--enable-ipv6 \
+        	--enable-unix-sockets \
+        	--without-libidn \
+        	--disable-static \
+        	--disable-ldap \
+        	--with-pic \
+    	&& make \
+    	&& make install \
+	) \
+    && rm -r curl-$CURL_VERSION \
+    && rm -r /usr/share/man \
+    && apk del .build-deps
+
+ENTRYPOINT ["/usr/local/bin/curl"]
+CMD ["-h"]