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# Note that this script was written to be executable by either version
# of python (checked by running pylint-2 and pylint-3 on it). Also
# note that the python version this script gets executed by is decided
# on by httpd/backends.cxx.
"""Build a docker file and container image based on a JSON template."""
from __future__ import print_function
import json
import os
import os.path
import sys
import string
import tempfile
import shutil
def _eprint(*args, **kwargs):
"""Print to stderr."""
print(*args, file=sys.stderr, **kwargs)
def _usage():
"""Display command-line usage."""
_eprint('Usage: %s [-v] --distro-file DISTRO_JSON_FILE'
' --build-file DATA_JSON_FILE --data-dir DATA_DIR'
' --dest-dir DEST_DIR'
% sys.argv[0])
sys.exit(1)
def _handle_command_line():
import getopt
verbose = 0
ivars = {}
# Make sure the command line looks reasonable.
if len(sys.argv) < 5:
_usage()
try:
(opts, pargs) = getopt.getopt(sys.argv[1:], 'v',
['distro-file=', 'build-file=',
'data-dir=', 'dest-dir='])
except getopt.GetoptError as err:
_eprint("Error: %s" % err)
_usage()
for (opt, value) in opts:
if opt == '-v':
verbose += 1
elif opt == '--distro-file':
ivars['DISTRO_FILE'] = value
elif opt == '--build-file':
ivars['BUILD_FILE'] = value
elif opt == '--data-dir':
ivars['DATA_DIR'] = value
elif opt == '--dest-dir':
ivars['DEST_DIR'] = value
if len(pargs) != 0:
_eprint("Extra argument found.")
_usage()
if 'DISTRO_FILE' not in ivars or 'BUILD_FILE' not in ivars \
or 'DATA_DIR' not in ivars or 'DEST_DIR' not in ivars:
_eprint("Arguments '--distro-file', '--build-file',"
" '--data-dir', and '--dest-dir' are required.")
_usage()
return (verbose, ivars)
def _load_distro_file(distro_path):
# Read in the distro file.
try:
jfile = open(distro_path)
except (OSError, IOError) as err:
_eprint("Error opening file %s: %s" % (distro_path, err))
sys.exit(1)
try:
distro_json = json.load(jfile)
except ValueError as err:
_eprint("Error: Invalid JSON input in file %s: %s"
% (distro_path, err))
jfile.close()
sys.exit(1)
jfile.close()
# We need to validate the distro JSON data here, making sure we've
# got everything we need.
if 'docker_stages' not in distro_json:
_eprint("Error: Missing 'docker_stages' data in %s." % distro_path)
sys.exit(1)
if 'distro_package_installer' not in distro_json:
_eprint("Error: Missing 'distro_package_installer' data in %s."
% distro_path)
sys.exit(1)
return distro_json
def _load_build_file(build_path):
# Read in the build file.
try:
jfile = open(build_path)
except (OSError, IOError) as err:
_eprint("Error opening file %s: %s" % (build_path, err))
sys.exit(1)
try:
build_json = json.load(jfile)
except ValueError as err:
_eprint("Error: Invalid JSON input in file %s: %s"
% (build_path, err))
jfile.close()
sys.exit(1)
jfile.close()
# We need to validate the build JSON data here, making sure we've
# got everything we need.
if 'file_info' not in build_json:
_eprint("Error: Missing 'file_info' data in %s." % build_path)
sys.exit(1)
if 'distro_version' not in build_json:
_eprint("Error: Missing 'distro_version' data in %s." % build_path)
sys.exit(1)
return build_json
def main():
"""Main function."""
(verbose, ivars) = _handle_command_line()
# Read the distro file.
distro_json = _load_distro_file(ivars['DISTRO_FILE'])
# Read the build file.
build_json = _load_build_file(ivars['BUILD_FILE'])
ivars['DVER'] = build_json['distro_version']
# If we've got a distro-specific script needed to install
# packages, copy it to the destination directory, since the docker
# 'COPY' directive only works on paths relative to the destination
# directory.
if 'distro_package_installer' in distro_json:
try:
src_path = os.path.join(ivars['DATA_DIR'],
distro_json['distro_package_installer'])
shutil.copy(src_path, ivars['DEST_DIR'])
except (shutil.Error, IOError) as err:
_eprint("Error: copy failed: %s" % err)
sys.exit(1)
dockerfile_data = ''
if 'header' in distro_json['docker_stages']:
# Now treat the data as a template, and substitute the
# information we've got. Why aren't we using docker's 'ARG'
# directive? There are places, like in 'FROM' directives, that
# you can't use 'ARG' variables. So, we're rolling our own.
orig_data = '\n'.join(distro_json['docker_stages']['header'])
orig_data += '\n'
template = string.Template(orig_data)
dockerfile_data += template.substitute(ivars)
# Now add an item for each file to be installed.
orig_data = '\n'.join(distro_json['docker_stages']['install'])
orig_data += '\n'
template = string.Template(orig_data)
for file_info in build_json['file_info']:
ivars['NAME'] = file_info['name']
ivars['PKG'] = file_info['pkg']
ivars['BUILD_ID'] = file_info['build_id']
dockerfile_data += template.substitute(ivars)
if 'footer' in distro_json['docker_stages']:
# See the 'header' discussion for why we're doing this.
orig_data = '\n'.join(distro_json['docker_stages']['footer'])
orig_data += '\n'
template = string.Template(orig_data)
dockerfile_data += template.substitute(ivars)
# Write the dockerfile data to a file.
dockerfile_path = ("%s/base.docker" % ivars['DEST_DIR'])
tmpfile = open(dockerfile_path, "w")
tmpfile.write(dockerfile_data)
tmpfile.close()
print("created file in %s\n" % ivars['DEST_DIR'])
# At this point we've created the docker file, so we're done.
sys.exit(0)
if __name__ == '__main__':
main()
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