From b81713203f68b0be14c55dcddf82af3367652526 Mon Sep 17 00:00:00 2001
From: Tianon Gravi <admwiggin@gmail.com>
Date: Tue, 13 Jun 2017 12:39:02 -0700
Subject: [PATCH] Add a little "paperclip" suggestion when attempting to run
 "dockerd" in the non-dind image variants

---
 17.03-rc/docker-entrypoint.sh | 15 +++++++++++++++
 17.03/docker-entrypoint.sh    | 15 +++++++++++++++
 17.05/docker-entrypoint.sh    | 15 +++++++++++++++
 17.06-rc/docker-entrypoint.sh | 15 +++++++++++++++
 docker-entrypoint.sh          | 15 +++++++++++++++
 5 files changed, 75 insertions(+)

diff --git a/17.03-rc/docker-entrypoint.sh b/17.03-rc/docker-entrypoint.sh
index fe790b143..848a4ad5f 100755
--- a/17.03-rc/docker-entrypoint.sh
+++ b/17.03-rc/docker-entrypoint.sh
@@ -17,4 +17,19 @@ if [ -z "$DOCKER_HOST" -a "$DOCKER_PORT_2375_TCP" ]; then
 	export DOCKER_HOST='tcp://docker:2375'
 fi
 
+if [ "$1" = 'dockerd' ]; then
+	cat >&2 <<-'EOW'
+
+		📎 Hey there!  It looks like you're trying to run a Docker daemon.
+
+		   You probably should use the "dind" image variant instead, something like:
+
+		     docker run --privileged --name some-overlay-docker -d docker:stable-dind --storage-driver=overlay
+
+		   See https://hub.docker.com/_/docker/ for more documentation and usage examples.
+
+	EOW
+	sleep 3
+fi
+
 exec "$@"
diff --git a/17.03/docker-entrypoint.sh b/17.03/docker-entrypoint.sh
index fe790b143..848a4ad5f 100755
--- a/17.03/docker-entrypoint.sh
+++ b/17.03/docker-entrypoint.sh
@@ -17,4 +17,19 @@ if [ -z "$DOCKER_HOST" -a "$DOCKER_PORT_2375_TCP" ]; then
 	export DOCKER_HOST='tcp://docker:2375'
 fi
 
+if [ "$1" = 'dockerd' ]; then
+	cat >&2 <<-'EOW'
+
+		📎 Hey there!  It looks like you're trying to run a Docker daemon.
+
+		   You probably should use the "dind" image variant instead, something like:
+
+		     docker run --privileged --name some-overlay-docker -d docker:stable-dind --storage-driver=overlay
+
+		   See https://hub.docker.com/_/docker/ for more documentation and usage examples.
+
+	EOW
+	sleep 3
+fi
+
 exec "$@"
diff --git a/17.05/docker-entrypoint.sh b/17.05/docker-entrypoint.sh
index fe790b143..848a4ad5f 100755
--- a/17.05/docker-entrypoint.sh
+++ b/17.05/docker-entrypoint.sh
@@ -17,4 +17,19 @@ if [ -z "$DOCKER_HOST" -a "$DOCKER_PORT_2375_TCP" ]; then
 	export DOCKER_HOST='tcp://docker:2375'
 fi
 
+if [ "$1" = 'dockerd' ]; then
+	cat >&2 <<-'EOW'
+
+		📎 Hey there!  It looks like you're trying to run a Docker daemon.
+
+		   You probably should use the "dind" image variant instead, something like:
+
+		     docker run --privileged --name some-overlay-docker -d docker:stable-dind --storage-driver=overlay
+
+		   See https://hub.docker.com/_/docker/ for more documentation and usage examples.
+
+	EOW
+	sleep 3
+fi
+
 exec "$@"
diff --git a/17.06-rc/docker-entrypoint.sh b/17.06-rc/docker-entrypoint.sh
index fe790b143..848a4ad5f 100755
--- a/17.06-rc/docker-entrypoint.sh
+++ b/17.06-rc/docker-entrypoint.sh
@@ -17,4 +17,19 @@ if [ -z "$DOCKER_HOST" -a "$DOCKER_PORT_2375_TCP" ]; then
 	export DOCKER_HOST='tcp://docker:2375'
 fi
 
+if [ "$1" = 'dockerd' ]; then
+	cat >&2 <<-'EOW'
+
+		📎 Hey there!  It looks like you're trying to run a Docker daemon.
+
+		   You probably should use the "dind" image variant instead, something like:
+
+		     docker run --privileged --name some-overlay-docker -d docker:stable-dind --storage-driver=overlay
+
+		   See https://hub.docker.com/_/docker/ for more documentation and usage examples.
+
+	EOW
+	sleep 3
+fi
+
 exec "$@"
diff --git a/docker-entrypoint.sh b/docker-entrypoint.sh
index fe790b143..848a4ad5f 100755
--- a/docker-entrypoint.sh
+++ b/docker-entrypoint.sh
@@ -17,4 +17,19 @@ if [ -z "$DOCKER_HOST" -a "$DOCKER_PORT_2375_TCP" ]; then
 	export DOCKER_HOST='tcp://docker:2375'
 fi
 
+if [ "$1" = 'dockerd' ]; then
+	cat >&2 <<-'EOW'
+
+		📎 Hey there!  It looks like you're trying to run a Docker daemon.
+
+		   You probably should use the "dind" image variant instead, something like:
+
+		     docker run --privileged --name some-overlay-docker -d docker:stable-dind --storage-driver=overlay
+
+		   See https://hub.docker.com/_/docker/ for more documentation and usage examples.
+
+	EOW
+	sleep 3
+fi
+
 exec "$@"