update dockerfile

Signed-off-by: Jess Frazelle <acidburn@microsoft.com>

Makefile

@@ -1,24 +1,37 @@
 .PHONY: build
 build: ## Builds all the dockerfiles in the repository.
-	./build-all.sh
+	@$(CURDIR)/build-all.sh
 
 .PHONY: latest-versions
 latest-versions: ## Checks all the latest versions of the Dockerfile contents.
-	./latest-versions.sh
+	@$(CURDIR)/latest-versions.sh
+
+check_defined = \
+				$(strip $(foreach 1,$1, \
+				$(call __check_defined,$1,$(strip $(value 2)))))
+__check_defined = \
+				  $(if $(value $1),, \
+				  $(error Undefined $1$(if $2, ($2))$(if $(value @), \
+				  required by target `$@')))
+
+.PHONY: run
+run: ## Run a Dockerfile from the command at the top of the file (ex. DIR=telnet).
+	@:$(call check_defined, DIR, directory of the Dockefile)
+	@$(CURDIR)/run.sh "$(DIR)"
 
 .PHONY: test
 test: shellcheck dockerfiles ## Runs the tests on the repository.
 
 .PHONY: dockerfiles
 dockerfiles: ## Tests the changes to the Dockefiles build.
-	./test.sh
+	@$(CURDIR)/test.sh
 
 # if this session isn't interactive, then we don't want to allocate a
 # TTY, which would fail, but if it is interactive, we do want to attach
 # so that the user can send e.g. ^C through.
 INTERACTIVE := $(shell [ -t 0 ] && echo 1 || echo 0)
 ifeq ($(INTERACTIVE), 1)
-        DOCKER_FLAGS += -t
+	DOCKER_FLAGS += -t
 endif
 
 .PHONY: shellcheck

run.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 #
 # This script allows you to launch several images
 # from this repository once they're built.
@@ -8,29 +8,32 @@
 # can find it and execute it.
 #
 # Use pulseaudio/Dockerfile and skype/Dockerfile as examples.
+set -e
+set -o pipefail
 
-if [ $# -eq 0 ]; then
+if [[ $# -eq 0 ]]; then
 	echo "Usage: $0 [--test] image1 image2 ..."
 	exit 1
 fi
 
-if [ "$1" = "--test" ]; then
+if [[ "$1" = "--test" ]]; then
 	TEST=1
 	shift
 fi
 
 for name in "$@"; do
-	if [ ! -d $name ]; then
-		echo "unable to find container configuration with name $name"
+	if [[ ! -d "$name" ]]; then
+		echo "Unable to find container configuration with name: $name"
 		exit 1
 	fi
 
-	script=`sed -n '/docker run/,/^#$/p' $name/Dockerfile | head -n -1 | sed -e 's/\#//' | sed -e 's/\\\//'`
+	script=$(sed -n '/docker run/,/^#$/p' "$name/Dockerfile" | head -n -1 | sed "s/#//" | sed "s#\\\##" | tr '\n' ' ' | sed "s/\$@//" | sed 's/""//')
+	echo "Running: $script"
 
 	if [ $TEST ]; then
-		echo $script
+		echo "$script"
 	else
-		eval $script
+		eval "$script"
 	fi
 
 	shift

telnet/Dockerfile

@@ -1,7 +1,7 @@
 # command to run Telnet
 # docker run -it --rm \
 #	--log-driver none \
-#	jess/telnet "$@"
+#	jess/telnet towel.blinkenlights.nl
 #
 FROM alpine:latest
 LABEL maintainer "Jessie Frazelle <jess@linux.com>"