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#!/usr/bin/python
# vi: ts=4 expandtab

import os
import sys
import shutil

import glob

import tempita

from distutils import version as ver

# This is more just for running from the bin folder so that
# cloud-init binary can find the cloudinit module
possible_topdir = os.path.normpath(os.path.join(os.path.abspath(
        sys.argv[0]), os.pardir, os.pardir))
if os.path.exists(os.path.join(possible_topdir, "cloudinit", "__init__.py")):
    sys.path.insert(0, possible_topdir)

from cloudinit import util
from cloudinit import version

# Mapping of expected packages to there full name...
PKG_MP = {
    'boto': 'python-boto',
    'tempita': 'python-tempita',
    'prettytable': 'python-prettytable',
    'oauth': 'python-oauth',
    'configobj': 'python-configobj',
    'yaml': 'PyYAML',
    'argparse': 'python-argparse'
}


def info(msg):
    print("INFO: %s" % (msg))


def warn(msg):
    print("WARNING: %s" % (msg))


def generate_spec_contents(tmpl_fn):

    # Version junk
    cmd = [os.path.join(os.pardir, 'tools', 'read-version')]
    (stdout, _stderr) = util.subp(cmd)
    i_version = stdout.strip()

    # Ensure ok match!
    if ver.StrictVersion(i_version) != version.version():
        raise RuntimeError("Version found does not match the code version")

    # Tmpl params
    subs = {}
    subs['version'] = i_version
    (stdout, _stderr) = util.subp(['bzr', 'revno'])
    subs['revno'] = "%s" % (stdout.strip())
    subs['release'] = "%s" % (subs['revno'])
    subs['archive_name'] = '%{name}-%{version}-' + subs['revno'] + '.tar.gz'
    subs['bd_requires'] = ['python-devel', 'python-setuptools']

    requires = []
    cmd = [os.path.join(os.pardir, 'tools', 'read-dependencies')]
    (stdout, _stderr) = util.subp(cmd)
    pkgs = stdout.splitlines()
    
    # Map to known packages
    for e in pkgs:
        e = e.lower().strip()
        tgt_pkg = None
        for n in PKG_MP.keys():
            if e.find(n) != -1:
                tgt_pkg = PKG_MP.get(n)
        if not tgt_pkg:
            raise RuntimeError(("Do not know how to translate %s to "
                                " a known package") % (e))
        else:
            requires.append(tgt_pkg)

    base_name = 'cloud-init-%s-%s' % (i_version, subs['revno'])
    subs['requires'] = requires

    (stdout, _stderr) = util.subp([os.path.join(os.getcwd(), 'rpm-changelog')])
    subs['changelog'] = stdout

    # See: http://www.zarb.org/~jasonc/macros.php
    # Pickup any special files
    docs = [
        'TODO',
        'LICENSE',
        'ChangeLog',
        'Requires',
        '%{_defaultdocdir}/cloud-init/*',
    ]
    subs['docs'] = docs
    configs = [
        'cloud/cloud.cfg',
        'cloud/cloud.cfg.d/*.cfg',
        'cloud/cloud.cfg.d/README',
        'cloud/templates/*',
    ]
    subs['configs'] = configs
    other_files = [
        '%{_bindir}/*',
        '/usr/lib/cloud-init/*',
    ]
    subs['files'] = other_files
    
    with open(tmpl_fn, 'r') as fh:
        tmpl = tempita.Template(fh.read())
        contents = tmpl.substitute(**subs)
        return (base_name, '%s.tar.gz' % (base_name), contents)


def main():

    # Clean out the root dir and make sure the dirs we want are in place
    root_dir = os.path.expanduser("~/rpmbuild")
    info("Cleaning %s" % (root_dir))
    if os.path.isdir(root_dir):
        util.delete_dir_contents(root_dir)
    arc_dir = os.path.join(root_dir, 'SOURCES')
    util.ensure_dirs([root_dir, arc_dir])

    # Form the spec file to be used
    tmpl_fn = os.path.join(os.getcwd(), 'brpm.tmpl')
    info("Generated spec file from template %s" % (tmpl_fn))
    (base_name, arc_name, contents) = generate_spec_contents(tmpl_fn)
    spec_fn = os.path.join(root_dir, 'cloud-init.spec')
    util.write_file(spec_fn, contents)
    info("Wrote spec file to %s" % (spec_fn))

    # Archive the code and files that we want to
    with util.tempdir() as td:
        src_dir = os.path.join(td, base_name)
        os.makedirs(src_dir)
        for fn in os.listdir(os.pardir):
            if fn.startswith("."):
                continue
            full_fn = os.path.abspath(os.path.join(os.pardir, fn))
            if os.path.isfile(full_fn):
                shutil.copy(full_fn, os.path.join(src_dir, fn))
            else:
                shutil.copytree(full_fn, os.path.join(src_dir, fn),
                                ignore=shutil.ignore_patterns('*.pyc',
                                                              '.bzr',
                                                              'tmp*',
                                                              '*bzr*'))
            arc_fn = os.path.join(arc_dir, arc_name)
        cmd = ['tar', '-zcvf', arc_fn, '-C', td]
        cmd.extend(os.listdir(td))
        util.subp(cmd)
        info("Archived code at %s" % (arc_fn))

    # Now build it!
    cmd = ['rpmbuild', '-ba', spec_fn]
    info("Running rpmbuild %s" % (cmd))
    util.subp(cmd)
    info("Rpmbuild completed!")

    # Copy the items built to our local dir
    globs = [] 
    globs.extend(glob.glob("%s/*.rpm" %
                           (os.path.join(root_dir, 'RPMS', 'noarch'))))
    globs.extend(glob.glob("%s/*.rpm" %
                           (os.path.join(root_dir, 'RPMS'))))
    globs.extend(glob.glob("%s/*.rpm" %
                           (os.path.join(root_dir, 'SRPMS'))))
    for fn in globs:
        n = os.path.basename(fn)
        tgt_fn = os.path.join(os.getcwd(), n)
        util.copy(fn, tgt_fn)
        info("Copied %s to %s" % (n, tgt_fn))

    return 0


if __name__ == '__main__':
    sys.exit(main())