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docker-build contrib script is deprecated by the new 'build' command
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Solomon Hykes
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Solomon Hykes <solomon@dotcloud.com>
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# docker-build: build your software with docker
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## Description
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docker-build is a script to build docker images from source. It will be deprecated once the 'build' feature is incorporated into docker itself (See https://github.com/dotcloud/docker/issues/278)
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Author: Solomon Hykes <solomon@dotcloud.com>
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## Install
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docker-builder requires:
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1) A reasonably recent Python setup (tested on 2.7.2).
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2) A running docker daemon at version 0.1.4 or more recent (http://www.docker.io/gettingstarted)
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## Usage
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First create a valid Changefile, which defines a sequence of changes to apply to a base image.
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$ cat Changefile
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# Start build from a know base image
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from base:ubuntu-12.10
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# Update ubuntu sources
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run echo 'deb http://archive.ubuntu.com/ubuntu quantal main universe multiverse' > /etc/apt/sources.list
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run apt-get update
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# Install system packages
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run DEBIAN_FRONTEND=noninteractive apt-get install -y -q git
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run DEBIAN_FRONTEND=noninteractive apt-get install -y -q curl
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run DEBIAN_FRONTEND=noninteractive apt-get install -y -q golang
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# Insert files from the host (./myscript must be present in the current directory)
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copy myscript /usr/local/bin/myscript
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Run docker-build, and pass the contents of your Changefile as standard input.
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$ IMG=$(./docker-build < Changefile)
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This will take a while: for each line of the changefile, docker-build will:
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1. Create a new container to execute the given command or insert the given file
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2. Wait for the container to complete execution
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3. Commit the resulting changes as a new image
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4. Use the resulting image as the input of the next step
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If all the steps succeed, the result will be an image containing the combined results of each build step.
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You can trace back those build steps by inspecting the image's history:
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$ docker history $IMG
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ID CREATED CREATED BY
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1e9e2045de86 A few seconds ago /bin/sh -c cat > /usr/local/bin/myscript; chmod +x /usr/local/bin/git
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77db140aa62a A few seconds ago /bin/sh -c DEBIAN_FRONTEND=noninteractive apt-get install -y -q golang
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77db140aa62a A few seconds ago /bin/sh -c DEBIAN_FRONTEND=noninteractive apt-get install -y -q curl
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77db140aa62a A few seconds ago /bin/sh -c DEBIAN_FRONTEND=noninteractive apt-get install -y -q git
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83e85d155451 A few seconds ago /bin/sh -c apt-get update
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bfd53b36d9d3 A few seconds ago /bin/sh -c echo 'deb http://archive.ubuntu.com/ubuntu quantal main universe multiverse' > /etc/apt/sources.list
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base 2 weeks ago /bin/bash
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27cf78414709 2 weeks ago
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Note that your build started from 'base', as instructed by your Changefile. But that base image itself seems to have been built in 2 steps - hence the extra step in the history.
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You can use this build technique to create any image you want: a database, a web application, or anything else that can be build by a sequence of unix commands - in other words, anything else.
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#!/usr/bin/env python
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# docker-build is a script to build docker images from source.
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# It will be deprecated once the 'build' feature is incorporated into docker itself.
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# (See https://github.com/dotcloud/docker/issues/278)
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#
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# Author: Solomon Hykes <solomon@dotcloud.com>
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# First create a valid Changefile, which defines a sequence of changes to apply to a base image.
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#
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# $ cat Changefile
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# # Start build from a know base image
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# from base:ubuntu-12.10
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# # Update ubuntu sources
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# run echo 'deb http://archive.ubuntu.com/ubuntu quantal main universe multiverse' > /etc/apt/sources.list
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# run apt-get update
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# # Install system packages
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# run DEBIAN_FRONTEND=noninteractive apt-get install -y -q git
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# run DEBIAN_FRONTEND=noninteractive apt-get install -y -q curl
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# run DEBIAN_FRONTEND=noninteractive apt-get install -y -q golang
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# # Insert files from the host (./myscript must be present in the current directory)
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# copy myscript /usr/local/bin/myscript
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#
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#
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# Run docker-build, and pass the contents of your Changefile as standard input.
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#
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# $ IMG=$(./docker-build < Changefile)
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#
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# This will take a while: for each line of the changefile, docker-build will:
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#
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# 1. Create a new container to execute the given command or insert the given file
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# 2. Wait for the container to complete execution
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# 3. Commit the resulting changes as a new image
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# 4. Use the resulting image as the input of the next step
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import sys
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import subprocess
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import json
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import hashlib
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def docker(args, stdin=None):
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print "# docker " + " ".join(args)
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p = subprocess.Popen(["docker"] + list(args), stdin=stdin, stdout=subprocess.PIPE)
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return p.stdout
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def image_exists(img):
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return docker(["inspect", img]).read().strip() != ""
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def image_config(img):
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return json.loads(docker(["inspect", img]).read()).get("config", {})
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def run_and_commit(img_in, cmd, stdin=None, author=None, run=None):
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run_id = docker(["run"] + (["-i", "-a", "stdin"] if stdin else ["-d"]) + [img_in, "/bin/sh", "-c", cmd], stdin=stdin).read().rstrip()
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print "---> Waiting for " + run_id
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result=int(docker(["wait", run_id]).read().rstrip())
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if result != 0:
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print "!!! '{}' return non-zero exit code '{}'. Aborting.".format(cmd, result)
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sys.exit(1)
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return docker(["commit"] + (["-author", author] if author else []) + (["-run", json.dumps(run)] if run is not None else []) + [run_id]).read().rstrip()
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def insert(base, src, dst, author=None):
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print "COPY {} to {} in {}".format(src, dst, base)
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if dst == "":
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raise Exception("Missing destination path")
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stdin = file(src)
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stdin.seek(0)
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return run_and_commit(base, "cat > {0}; chmod +x {0}".format(dst), stdin=stdin, author=author)
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def add(base, src, dst, author=None):
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print "PUSH to {} in {}".format(dst, base)
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if src == ".":
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tar = subprocess.Popen(["tar", "-c", "."], stdout=subprocess.PIPE).stdout
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else:
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tar = subprocess.Popen(["curl", src], stdout=subprocess.PIPE).stdout
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if dst == "":
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raise Exception("Missing argument to push")
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return run_and_commit(base, "mkdir -p '{0}' && tar -C '{0}' -x".format(dst), stdin=tar, author=author)
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def main():
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base=""
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maintainer=""
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steps = []
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try:
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for line in sys.stdin.readlines():
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line = line.strip()
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# Skip comments and empty lines
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if line == "" or line[0] == "#":
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continue
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op, param = line.split(None, 1)
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print op.upper() + " " + param
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if op == "from":
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base = param
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steps.append(base)
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elif op == "maintainer":
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maintainer = param
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elif op == "run":
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result = run_and_commit(base, param, author=maintainer)
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steps.append(result)
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base = result
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print "===> " + base
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elif op == "copy":
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src, dst = param.split(" ", 1)
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result = insert(base, src, dst, author=maintainer)
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steps.append(result)
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base = result
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print "===> " + base
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elif op == "add":
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src, dst = param.split(" ", 1)
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result = add(base, src, dst, author=maintainer)
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steps.append(result)
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base=result
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print "===> " + base
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elif op == "expose":
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config = image_config(base)
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if config.get("PortSpecs") is None:
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config["PortSpecs"] = []
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portspec = param.strip()
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config["PortSpecs"].append(portspec)
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result = run_and_commit(base, "# (nop) expose port {}".format(portspec), author=maintainer, run=config)
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steps.append(result)
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base=result
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print "===> " + base
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elif op == "cmd":
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config = image_config(base)
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cmd = list(json.loads(param))
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config["Cmd"] = cmd
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result = run_and_commit(base, "# (nop) set default command to '{}'".format(" ".join(cmd)), author=maintainer, run=config)
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steps.append(result)
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base=result
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print "===> " + base
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else:
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print "Skipping uknown op " + op
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except:
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docker(["rmi"] + steps[1:])
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raise
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print base
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if __name__ == "__main__":
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main()
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@ -1,13 +0,0 @@
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# Start build from a know base image
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maintainer Solomon Hykes <solomon@dotcloud.com>
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from base:ubuntu-12.10
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# Update ubuntu sources
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run echo 'deb http://archive.ubuntu.com/ubuntu quantal main universe multiverse' > /etc/apt/sources.list
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run apt-get update
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# Install system packages
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run DEBIAN_FRONTEND=noninteractive apt-get install -y -q git
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run DEBIAN_FRONTEND=noninteractive apt-get install -y -q curl
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run DEBIAN_FRONTEND=noninteractive apt-get install -y -q golang
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# Insert files from the host (./myscript must be present in the current directory)
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copy myscript /usr/local/bin/myscript
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push /src
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@ -1,3 +0,0 @@
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#!/bin/sh
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echo hello, world!
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