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get-source.py
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get-source.py
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#!/usr/bin/env python3
# coding=utf-8
import sys
import urllib.request
from utils import Fore, parse_image_arg, chunked_copy, clear_progress, handle_sigint, ensure_ca_load
# handle arguments
handle_sigint()
ensure_ca_load()
if len(sys.argv) < 2:
print('usage: ./get-source.py image[:tag]')
sys.exit(-1)
image, tag, fname, label = parse_image_arg(sys.argv[1], False)
dfurl = ''
tgurl = ''
# find the Dockerfile for the specified image and tag
print('%s[*]%s Fetching official-images info for %s%s%s:%s%s%s...' % (Fore.GREEN, Fore.RESET, Fore.YELLOW, image, Fore.RESET, Fore.YELLOW, tag, Fore.RESET))
try:
with urllib.request.urlopen('https://raw.githubusercontent.com/docker-library/official-images/master/library/' + image) as f:
data = f.read().decode('utf-8').splitlines() + ['']
# there seems to be two versions for this file:
# a) simplistic one-line per tag:
# latest: git://github.com/oracle/docker-images.git@a44844fe085a561ded44865eafb63f742e4250c1 OracleLinux/7.2
# b) key-values spanning over multiple lines:
# GitRepo: https://github.com/CentOS/sig-cloud-instance-images.git
# Directory: docker
# Tags: latest, centos7, 7
# GitFetch: refs/heads/CentOS-7
# GitCommit: f5b919346432acc728078aa32ffb6dcf84d303a0
# try a) first
for line in data:
if line.startswith(tag + ': '):
# extract the parts
line = line.split(': ', 1)
line = line[1].split(' ', 1)
path = line[1]
line = line[0].split('@', 1)
repo = line[0]
commit = line[1]
repo = repo[repo.find('github.com/') + len('github.com/'):]
if repo.find('.git') != -1:
repo = repo[:repo.find('.git')]
if len(path) != 0:
path = '/' + path
# build direct URL to Dockerfile
dfurl = 'https://raw.githubusercontent.com/%s/%s%s/Dockerfile' % (repo, commit, path)
break
# try b) second
if not dfurl:
repo = ''
path = ''
commit = ''
isTag = False
for line in data:
if line == '':
# tags are separated by double new lines and we need to wait for all values
# before building the direct URL
if isTag and repo and commit:
dfurl = 'https://raw.githubusercontent.com/%s/%s%s/Dockerfile' % (repo, commit, path)
break
else:
continue
line = line.split(': ', 1)
# collect key-values
if line[0] == 'GitRepo':
repo = line[1]
repo = repo[repo.find('github.com/') + len('github.com/') : repo.find('.git')]
elif line[0] == 'Tags':
tags = line[1].split(', ')
isTag = tag in tags
elif line[0] == 'GitCommit':
commit = line[1]
elif line[0] == 'Directory':
path = '/' + line[1]
# otherwise, fail miserably
if not dfurl:
print('%s[!]%s Failed to find tag %s%s%s for image %s%s%s.' % (Fore.RED, Fore.RESET, Fore.BLUE, tag, Fore.RESET, Fore.BLUE, image, Fore.RESET))
sys.exit(-1)
except urllib.error.HTTPError as err:
print('%s[!]%s Failed to fetch official-images info for %s%s%s: %s' % (Fore.RED, Fore.RESET, Fore.BLUE, image, Fore.RESET, err))
print('%s[!]%s If this is not an official image, try getting it with %sget-prebuilt.py %s%s.' % (Fore.RED, Fore.RESET, Fore.GREEN, sys.argv[1].strip(), Fore.RESET))
sys.exit(-1)
# process Dockerfile
print('%s[*]%s Fetching Dockerfile from repo %s%s%s...' % (Fore.GREEN, Fore.RESET, Fore.BLUE, dfurl[dfurl.find('.com/') + len('.com/') : dfurl.find('/Dockerfile')], Fore.RESET))
try:
with urllib.request.urlopen(dfurl) as f:
data = f.read().decode('utf-8').splitlines()
for line in data:
line = line.split(' ')
# we are only interested in rootfs archives, generally specified like so:
# ADD oraclelinux-7.2-rootfs.tar.xz /
if line[0].lower() == 'add' and line[2] == '/':
tgurl = dfurl[:dfurl.rfind('/Dockerfile') + 1] + line[1]
fname += line[1][line[1].find('.tar'):]
# otherwise, fail miserably
if not tgurl:
print('%s[!]%s Failed to find a suitable rootfs specification in Dockerfile.' % (Fore.RED, Fore.RESET))
sys.exit(-1)
except urllib.error.HTTPError as err:
print('%s[!]%s Failed to fetch Dockerfile from %s%s%s: %s' % (Fore.RED, Fore.RESET, Fore.BLUE, dfurl, Fore.RESET, err))
sys.exit(-1)
# download rootfs archive
print('%s[*]%s Downloading archive %s%s%s...' % (Fore.GREEN, Fore.RESET, Fore.BLUE, tgurl, Fore.RESET))
try:
with urllib.request.urlopen(tgurl) as u, open(fname, 'wb') as f:
chunked_copy(fname, u, f)
except urllib.error.HTTPError as err:
clear_progress()
print('%s[!]%s Failed to download archive from %s%s%s: %s' % (Fore.RED, Fore.RESET, Fore.BLUE, tgurl, Fore.RESET, err))
sys.exit(-1)
except OSError as err:
clear_progress()
print('%s[!]%s Failed to open file %s%s%s for writing: %s' % (Fore.RED, Fore.RESET, Fore.BLUE, fname, Fore.RESET, err))
sys.exit(-1)
print('%s[*]%s Rootfs archive for %s%s%s:%s%s%s saved to %s%s%s.' % (Fore.GREEN, Fore.RESET, Fore.YELLOW, image, Fore.RESET, Fore.YELLOW, tag, Fore.RESET, Fore.GREEN, fname, Fore.RESET))