Move base images directory to top level

These are standalone, better to have them at the top.

Signed-off-by: Justin Cormack <justin.cormack@docker.com>

base/perf/.gitignore

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+/bin

base/perf/Dockerfile

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+FROM alpine:3.4
+
+RUN \
+  apk update && apk upgrade && \
+  apk add \
+  argp-standalone \
+  automake \
+  bc \
+  binutils-dev \
+  bison \
+  build-base \
+  curl \
+  flex \
+  libelf-dev \
+  linux-headers \
+  sed \
+  tar \
+  util-linux-dev \
+  xz \
+  && true
+
+ARG KERNEL_VERSION=4.9.3
+
+# get kernel source and extract it under /linux
+ENV KERNEL_SOURCE=https://www.kernel.org/pub/linux/kernel/v4.x/linux-${KERNEL_VERSION}.tar.xz
+RUN curl -fsSL -o linux-${KERNEL_VERSION}.tar.xz ${KERNEL_SOURCE}
+RUN cat linux-${KERNEL_VERSION}.tar.xz | tar --absolute-names -xJ &&  mv /linux-${KERNEL_VERSION} /linux
+
+RUN mkdir -p /build/perf && \
+    make -C /linux/tools/perf O=/build/perf LDFLAGS=-static
+
+WORKDIR /build/perf
+CMD ["tar", "cf", "-", "perf"]
+    
+    

base/perf/Makefile

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+BASE=alpine:3.4
+
+DEPS=Dockerfile
+
+bin/perf: $(DEPS)
+	DOCKER_CONTENT_TRUST=1 docker pull $(BASE)
+	mkdir -p $(dir $@)
+	BUILD=$$( docker build -q . ) && \
+	docker run --rm --net=none $$BUILD | tar xf - -C bin
+
+clean:
+	rm -rf bin

base/perf/README.md

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+Builds a statically linked version of the Linux kernel `perf` utility. You may want to/need to adjust the kernel version in the `Dockerfile` to match your kernel.