stdlib: docker: support running containers on the local docker engine

Depends on #570

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

stdlib/docker/docker.cue

@@ -1,6 +1,8 @@
 package docker
 
 import (
+	"strconv"
+
 	"dagger.io/dagger"
 	"dagger.io/dagger/op"
 )
@@ -42,23 +44,26 @@ import (
 }
 
 #Run: {
-	// Remote host
-	host: string @dagger(input)
+	// Connect to a remote SSH server
+	ssh?: {
+		// ssh host
+		host: string @dagger(input)
 
-	// Remote user
-	user: string @dagger(input)
+		// ssh user
+		user: string @dagger(input)
 
-	// Ssh remote port
-	port: *22 | int @dagger(input)
+		// ssh port
+		port: *22 | int @dagger(input)
 
-	// Ssh private key
-	key: dagger.#Secret @dagger(input)
+		// private key
+		key: dagger.#Secret @dagger(input)
 
-	// User fingerprint
-	fingerprint?: string @dagger(input)
+		// fingerprint
+		fingerprint?: string @dagger(input)
 
-	// Ssh passphrase
-	passphrase?: dagger.#Secret @dagger(input)
+		// ssh key passphrase
+		keyPassphrase?: dagger.#Secret @dagger(input)
+	}
 
 	// Image reference (e.g: nginx:alpine)
 	ref: string @dagger(input)
@@ -74,42 +79,46 @@ import (
 	} @dagger(input)
 
 	#code: #"""
-	export DOCKER_HOST="ssh://$DOCKER_USERNAME@$DOCKER_HOSTNAME:\#(port)"
+		if [ -n "$DOCKER_HOSTNAME" ]; then
+			export DOCKER_HOST="ssh://$DOCKER_USERNAME@$DOCKER_HOSTNAME:$DOCKER_PORT"
 
-	# Start ssh-agent
-	eval $(ssh-agent) > /dev/null
+			# Start ssh-agent
+			eval $(ssh-agent) > /dev/null
 
-	# Add key
-	message="$(ssh-keygen -y -f /key < /dev/null 2>&1)" || {
-		>&2 echo "$message"
-		exit 1
-	}
+			# Add key
+			if [ -f "/key" ]; then
+				message="$(ssh-keygen -y -f /key < /dev/null 2>&1)" || {
+					>&2 echo "$message"
+					exit 1
+				}
 
-	ssh-add /key > /dev/null
-	if [ "$?" != 0 ]; then
-		exit 1
-	fi
+				ssh-add /key > /dev/null
+				if [ "$?" != 0 ]; then
+					exit 1
+				fi
+			fi
 
-	if [[ ! -z $FINGERPRINT ]]; then
-		mkdir -p "$HOME"/.ssh
+			if [[ ! -z $FINGERPRINT ]]; then
+				mkdir -p "$HOME"/.ssh
 
-		# Add user's fingerprint to known hosts
-		echo "$FINGERPRINT" >> "$HOME"/.ssh/known_hosts
-	else
-		# Add host to known hosts
-		ssh -i /key -o "UserKnownHostsFile "$HOME"/.ssh/known_hosts" -o "StrictHostKeyChecking accept-new" -p \#(port) "$DOCKER_USERNAME"@"$DOCKER_HOSTNAME" /bin/true > /dev/null 2>&1
-	fi
+				# Add user's fingerprint to known hosts
+				echo "$FINGERPRINT" >> "$HOME"/.ssh/known_hosts
+			else
+				# Add host to known hosts
+				ssh -i /key -o "UserKnownHostsFile "$HOME"/.ssh/known_hosts" -o "StrictHostKeyChecking accept-new" -p "$DOCKER_PORT" "$DOCKER_USERNAME"@"$DOCKER_HOSTNAME" /bin/true > /dev/null 2>&1
+			fi
+		fi
 
 
-	# Run detach container
-	OPTS=""
+		# Run detach container
+		OPTS=""
 
-	if [ ! -z "$CONTAINER_NAME" ]; then
-		OPTS="$OPTS --name $CONTAINER_NAME"
-	fi
+		if [ ! -z "$CONTAINER_NAME" ]; then
+			OPTS="$OPTS --name $CONTAINER_NAME"
+		fi
 
-	docker container run -d $OPTS \#(ref)
-	"""#
+		docker container run -d $OPTS "$IMAGE_REF"
+		"""#
 
 	#up: [
 		op.#Load & {from: #Client},
@@ -118,7 +127,7 @@ import (
 			op.#DockerLogin & {registry}
 		},
 
-		if passphrase != _|_ {
+		if ssh.keyPassphrase != _|_ {
 			op.#WriteFile & {
 				content: #"""
 					#!/bin/bash
@@ -145,23 +154,32 @@ import (
 				"/entrypoint.sh",
 			]
 			env: {
-				DOCKER_HOSTNAME: host
-				DOCKER_USERNAME: user
-				if passphrase != _|_ {
-					SSH_ASKPASS: "/get_passphrase"
-					DISPLAY:     "1"
+				IMAGE_REF: ref
+				if ssh != _|_ {
+					DOCKER_HOSTNAME: ssh.host
+					DOCKER_USERNAME: ssh.user
+					DOCKER_PORT:     strconv.FormatInt(ssh.port, 10)
+					if ssh.keyPassphrase != _|_ {
+						SSH_ASKPASS: "/get_passphrase"
+						DISPLAY:     "1"
+					}
+					if ssh.fingerprint != _|_ {
+						FINGERPRINT: ssh.fingerprint
+					}
 				}
 				if name != _|_ {
 					CONTAINER_NAME: name
 				}
-				if fingerprint != _|_ {
-					FINGERPRINT: fingerprint
-				}
 			}
 			mount: {
-				"/key": secret: key
-				if passphrase != _|_ {
-					"/passphrase": secret: passphrase
+				if ssh == _|_ {
+					"/var/run/docker.sock": "docker.sock"
+				}
+				if ssh.key != _|_ {
+					"/key": secret: ssh.key
+				}
+				if ssh.keyPassphrase != _|_ {
+					"/passphrase": secret: ssh.keyPassphrase
 				}
 			}
 		},