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|
#!/bin/python
from __future__ import print_function
import sys
import tempfile
import shutil
from argparse import ArgumentParser, RawDescriptionHelpFormatter
def error(msg):
print(msg, file=sys.stderr)
def die(msg):
error(msg)
sys.exit(1)
description = \
"""
Generate script using predefined metadata about distribution and
templates.
As an example of 'dg' usage, to generate _Dockerfile_ for Fedora
21 64-bit system, you may use command(s):
$ cd project/directory
$ dg --spec docker-data.yaml \\
--template docker.tpl \\
--distro fedora-21-x86_64.yaml
"""
parser = ArgumentParser(
description=description,
formatter_class=RawDescriptionHelpFormatter,
)
parser.man_short_description = "templating system/generator for distributions"
parser.add_argument(
'--projectdir',
metavar='PROJECTDIR',
type=str,
help='Directory with project (defaults to CWD)',
default="."
)
parser.add_argument(
'--distro',
metavar='DIST',
type=str,
help='Use distribution metadata specified by DIST yaml file',
default="fedora-21-x86_64.yaml",
)
parser.add_argument(
'--multispec',
metavar='MULTISPEC',
type=str,
help='Use MULTISPEC yaml file to fill the TEMPLATE file',
)
parser.add_argument(
'--multispec-selector',
metavar='MULTISPEC_SELECTOR',
type=str,
help='Selectors for the multispec file',
action='append',
default=[],
)
parser.add_argument(
'--spec',
metavar='SPEC',
type=str,
help='Use SPEC yaml file to fill the TEMPLATE file',
action='append',
)
parser.add_argument(
'--output',
metavar='OUTPUT',
type=str,
help='Write result to OUTPUT file instead of stdout',
)
parser.add_argument(
'--macros-from',
metavar='PROJECTDIR',
type=str,
action='append',
help='Load variables from PROJECTDIR',
)
parser.add_argument(
'--container',
metavar='CONTAINER_TYPE',
type=str,
help='Container type, e.g. \'docker\'',
default=False,
)
parser.add_argument(
'--macro',
metavar='MACRO',
type=str,
action='append',
help='Define distgen\'s macro',
)
parser.add_argument(
'--max-passes',
metavar='PASSES',
type=int,
default=1,
help='Maximum number of rendering passes, defaults to 1 (== no re-rendering)',
)
tpl_or_combinations = parser.add_mutually_exclusive_group(required=True)
tpl_or_combinations.add_argument(
'--template',
metavar='TEMPLATE',
type=str,
help='Use TEMPLATE file, e.g. docker.tpl or a template string, '
'e.g. "{{ config.docker.from }}"'
)
tpl_or_combinations.add_argument(
'--multispec-combinations',
action='store_true',
help='Print available multispec combinations',
)
def print_multispec_combinations(args):
ms = Multispec.from_path(args.projectdir, args.multispec)
for c in ms.get_all_combinations():
to_print = ['--distro {0}'.format(c.pop('distro'))]
[to_print.append('--multispec-selector {0}={1}'.format(k, v)) for k, v in c.items()]
print(' '.join(to_print))
def render_template(args):
temp_filename = False
output = sys.stdout
try:
if args.output:
_, temp_filename = tempfile.mkstemp(prefix="distgen-")
output = open(temp_filename, 'w')
except:
die("can't create temporary file for '{0}'".format(args.output))
cmd_cfg = CommandsConfig()
cmd_cfg.container = args.container
explicit_macros = {}
if args.macro:
for i in args.macro:
key, value = i.split(' ', 1)
explicit_macros[key] = value
if args.template == '-':
args.template = "/proc/self/fd/0"
generator = Generator()
generator.load_project(args.projectdir)
generator.render(
args.spec,
args.multispec,
args.multispec_selector,
args.template,
args.distro,
cmd_cfg,
output,
args.macros_from,
explicit_macros,
args.max_passes,
)
if temp_filename:
try:
output.close()
shutil.move(temp_filename, args.output)
except:
die("can't move '{0}' into '{1}'".format(temp_filename, args.output))
def main():
args = parser.parse_args()
if args.multispec_combinations:
print_multispec_combinations(args)
else:
render_template(args)
if __name__ == "__main__":
main()
|
