add compose dynamic

Signed-off-by: Avi Deitcher <avi@deitcher.net>

projects/compose/image/Dockerfile

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+FROM docker/compose:1.13.0
+# because compose requires all sorts of dynamic libs, including glibc, it is much easier to
+#   add docker client to compose than the reverse
+
+ENV DOCKER_BUCKET get.docker.com
+ENV DOCKER_VERSION 17.05.0-ce
+ENV DOCKER_SHA256 340e0b5a009ba70e1b644136b94d13824db0aeb52e09071410f35a95d94316d9
+
+# we need docker compose and docker load
+# also need curl to test availability of docker API
+RUN apk add --update curl
+
+# we only need the client
+RUN set -x \
+	&& curl -fSL "https://${DOCKER_BUCKET}/builds/Linux/x86_64/docker-${DOCKER_VERSION}.tgz" -o docker.tgz \
+	&& echo "${DOCKER_SHA256} *docker.tgz" | sha256sum -c - \
+	&& tar -xzvf docker.tgz \
+	&& mv docker/docker /usr/bin/ \
+	&& rm -rf docker docker.tgz \
+	&& docker -v
+
+
+RUN mkdir -p /compose /app
+WORKDIR /app
+COPY . /app
+ENTRYPOINT ["/app/waitfordocker.sh"]
+CMD ["/app/load-images-and-compose.sh"]

projects/compose/image/load-images-and-compose.sh

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+#!/bin/sh
+set -e
+
+#########
+#
+# load any cached mounted images, and run compose
+#
+########
+
+[ -n "$DEBUG" ] && set -x
+
+for image in /compose/images/*.tar ; do
+	docker image load -i $image && rm -f $image
+done
+
+
+docker-compose -f /compose/docker-compose.yml up -d

projects/compose/image/waitfordocker.sh

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+#!/bin/sh
+set -e
+
+#########
+#
+# wait for docker socket to be ready, then run the rest of the command
+#
+########
+RETRIES=${RETRIES:-"-1"}
+WAIT=${WAIT:=10}
+[ -n "$DEBUG" ] && set -x
+
+# keep retrying until docker is ready or we hit our limut
+retry_or_fail() {
+  local retry_count=0
+  local success=1
+  local cmd=$1
+  local retryMax=$2
+  local retrySleep=$3
+  local message=$4
+  until [[ $retry_count -ge $retryMax && $retryMax -ne -1 ]]; do
+    echo "trying to $message"
+    set +e
+    $cmd
+    success=$?
+    set -e
+    [[ $success == 0 ]] && break
+    retry_count=$(( $retry_count+1 )) || true
+    echo "attempt number $retry_count failed to $message, sleeping $retrySleep seconds..."
+    sleep $retrySleep
+  done
+  # did we succeed?
+  if [[ $success != 0 ]]; then
+    echo "failed to $message after $retryMax tries. Exiting..." >&2
+    exit 1
+  fi
+}
+
+connect_to_docker() {
+  [ -S /var/run/docker.sock ] || return 1
+  curl --unix-socket /var/run/docker.sock http://localhost/containers/json >/dev/null 2>&1 || return 1
+}
+# try to connect to docker
+retry_or_fail connect_to_docker $RETRIES $WAIT "connect to docker"
+
+# if we got here, we succeeded
+$@