├── README.md
└── docker-releasetag


/README.md:
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 1 | # docker-releasetag
 2 | 
 3 | Prototype of how `docker tag` should work to help aid in [12Factor](http://12factor.net/) releases in the Docker world. 
 4 | 
 5 | A [release in 12Factor](http://12factor.net/build-release-run) is a "build" + "config", where "config" is environment variables. In this case, a "build" is a Docker container image. 
 6 | 
 7 | ## Using docker-releasetag
 8 | 
 9 | It works roughly as `docker tag`, but you can pass the environment as arguments:
10 | 
11 | 	$ docker-releasetag mybuild myrelease:v1 FOO=bar BAZ=qux
12 | 
13 | Or if you have an environment file:
14 | 
15 | 	FOO=bar
16 | 	BAZ=qux
17 | 
18 | Then you can pass it via STDIN using the `-` argument:
19 | 
20 | 	$ docker-releasetag mybuild myrelease:v1 - < envfile
21 | 


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/docker-releasetag:
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 1 | #!/bin/bash
 2 | 
 3 | main() {
 4 | 	local source_image="$1"; shift
 5 | 	local release_tag="$1"; shift
 6 | 	local environ="$@"
 7 | 
 8 | 	if [[ "$environ" == "" ]]; then
 9 | 		echo "No environment specified"
10 | 		exit 1
11 | 	fi
12 | 
13 | 	if [[ "$environ" == "-" ]]; then
14 | 		environ="$(cat)"
15 | 	else
16 | 		environ="$(echo -e "${environ/ /\n}")"
17 | 	fi
18 | 
19 | 	local dir=$(mktemp -dt "$(basename $0).XXXX")
20 | 	echo "$dir"
21 | 	trap "rm -rf $dir" EXIT
22 | 
23 | 	local dockerfile="$dir/Dockerfile"
24 | 	echo "FROM $source_image" > "$dockerfile"
25 | 
26 | 	while IFS="=" read key value; do
27 | 		echo "ENV" "$key" "$value" >> "$dockerfile"
28 | 	done <<< "$environ"
29 | 
30 | 	cd "$dir" && docker build -t "$release_tag" .
31 | }
32 | 
33 | [[ "$0" == "$BASH_SOURCE" ]] && main $@


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