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#!/usr/bin/env python
# -*- coding: utf-8 -*-

import ConfigParser
import logging
import paramiko
import optparse
import sys
import os

LOGGING_LEVELS = {
    'debug': logging.DEBUG,
    'info': logging.INFO,
    'warning': logging.WARNING,
    'error': logging.ERROR,
    'critical': logging.CRITICAL,
}

LOG = logging.getLogger('rpmbuild-remote')

EXTENSIONS = (
    '.patch',
    '.bz2',
    '.gz',
    '.tgz',
    '.lzma',
    '.xz',
)

def get_parser():
    parser = optparse.OptionParser(usage="%prog [options]... <files>...")
    home = os.path.expanduser("~")
    parser.set_conflict_handler("resolve")
    parser.add_option("-c", "--config",
            action="store", type="string", dest="config",
            default=os.path.join(home, ".rpmbuild-remote"),
            help="Configuration file to use for the build. "
                 "[Default: ~/.rpmbuild-remote")
    parser.add_option("-s", "--system",
            action="store", type="string", dest="system",
            help="The remote machine to use (defined in config file)")
    parser.add_option("-k", "--ssh-key",
            action="store", type="string", dest="ssh_key",
            help="The private SSH key to use to login.")
    parser.add_option("-u", "--user",
            action="store", type="string", dest="user",
            default=os.getlogin(),
            help="The username on the remote system [Default: current user]")
    parser.add_option("-h", "--host",
            action="store", type="string", dest="host",
            help="The hostname/IP of the remote system")
    parser.add_option("-p", "--port",
            action="store", type="int", dest="port",
            default=22,
            help="The port to use on the remote system [Default: 22]")
    parser.add_option("-d", "--dest",
            action="store", type="string", dest="dest",
            default=os.path.join(home, "rpmbuild-remote"),
            help="Directory to place resulting files "
                 "[Default: ~/rpmbuild-remote/]")
    parser.add_option("-m", "--mock",
            action="store", type="string", dest="mock",
            help="Mock configuration to use (only applies to SRPM files) "
                 "[Default: Use rpmbuild --rebuild)]")
    parser.add_option("-v", "--verbose",
            action="store", type="string", dest="verbose",
            default="info",
            help="Error level (debug|info|warning|error|critical) "
                 "[Default: info]")
    parser.add_option("-o", "--outfile",
            action="store", type="string", dest="log_file",
            default=os.path.join(home, "rpmbuild-remote", "log"),
            help="Log file [Default: ~/rpmbuild-remote/log]")
    return parser

def read_section(config, section, values):
    ret = {}
    if config.has_section(section):
        for value, typ in values:
            if config.has_option(section, value):
                if typ == 'int':
                    method = config.getint
                elif typ == 'float':
                    method = config.getfloat
                elif typ == 'boolean':
                    method = config.getboolean
                elif typ == 'str':
                    method = config.get
                else:
                    method = config.get
                    LOG.warning("Unknown type %s, assuming string" % typ)
                ret[value] = method(section, value)
    return ret

def read_preferences(opts):
    values = (
                 ('user', 'str'),
                 ('ssh_key', 'str'),
                 ('host', 'str'),
                 ('port', 'int'),
             )
    config = ConfigParser.SafeConfigParser()
    config.read(opts.config)
    system = read_section(config, opts.system, values)
    if system == {}:
        system = read_section(config, 'default', values)
    if 'user' not in system:
        system['user'] = opts.user
    if 'ssh_key' not in system:
        system['ssh_key'] = opts.ssh_key
    if 'host' not in system:
        if opts.host is None:
            LOG.error("Host not set")
            sys.exit(1)
        system['host'] = opts.host
    if 'port' not in system:
        system['port'] = opts.port
    return system

def send_files(session, files, dest):
    sftp = session.open_sftp()
    for file in files:
        LOG.info("Writing %s to server (%s)" % (file, dest))
        sftp.put(file, dest)
    sftp.close()

def get_files(session, files, dest):
    sftp = session.open_sftp()
    for file in files:
        LOG.info("Fetching %s from server" % file)
        sftp.get(file, dest)
    sftp.close()

def log_regex(build_output):
    out = open(build_output, 'r')
    regex = re.compile("Wrote: (.+)")
    files = regex.findall(out.read())
    out.close()

def get_mock_results(session, dest, sout, serr):
    os.mkdirs(dest)
    out = open(os.path.join(dest, 'mock.stdout'), 'w+')
    out.write(sout.read())
    out.close()
    err = open(os.path.join(dest, 'mock.stderr'), 'w+')
    err.write(serr.read())
    err.close()
    output_dir = re.compile(r'INFO: Results and/or logs in: (.+)').group(1)
    logs = [os.path.join(output_dir, x)
            for x in ['build.log', 'root.log', 'state.log']]
    get_files(session, logs, dest)
    get_files(os.path.join(dest, 'build.log'), dest)

def get_rpmbuild_results(session, dest, sout, serr):
    os.mkdirs(dest)
    out = open(os.path.join(dest, 'rpmbuild.stdout', 'w+'))
    out.write(sout.read())
    out.close()
    err = open(os.path.join(dest, 'rpmbuild.stderr', 'w+'))
    err.write(serr.read())
    err.close()
    get_files(os.path.join(dest, 'rpmbuild.stdout'), dest)

def execute_jobs(opts, system, jobs):
    session = paramiko.SSHClient()
    session.load_system_host_keys()
    LOG.info("Connecting to %(user)s@%(host)s:%(port)d" % system)
    session.connect(system['host'], port=system['port'],
                    username=system['user'], key_filename=system['ssh_key'])
    for job in jobs:
        if type(job) == type(''):
            dest = "rpmbuild/SRPMS/"
            send_files(session, [job], dest)
            file = os.path.basename(job)
            if opts.mock is None:
                LOG.info("Building %s" % file)
                cmd = "rpmbuild --rebuild rpmbuild/SRPMS/%s" % file
                fetch = get_rpmbuild_results
            else:
                LOG.info("Building %s with mock config %s" % (file, opts.mock))
                cmd = "mock -r %s rpmbuild/SRPMS/%s" % (opts.mock, file)
                fetch = get_mock_results
        else:
            dest = "rpmbuild/SPECS/"
            send_files(session, [job[0]], dest)
            dest = "rpmbuild/SOURCES/"
            send_files(session, job[1:], dest)
            file = os.path.basename(job[0])
            LOG.info("Building %s from %d souces" % (file, len(job) - 1))
            cmd = "rpmbuild -ba rpmbuild/SPECS/%s" % file
            fetch = get_rpmbuild_results
        files = session.exec_command(cmd)
        LOG.info("Downloading results...")
        files[0].close()
        fetch(session, os.path.join(opts.dest, file), files[1], files[2])
        files[1].close()
        files[2].close()
    session.close()

def main():
    parser = get_parser()
    opts, args = parser.parse_args()
    log_level = LOGGING_LEVELS.get(opts.verbose, logging.NOTSET)
    logging.basicConfig(filename=opts.log_file, level=log_level)
    jobs = []
    for arg in args:
        ext = os.path.splitext(arg)[1]
        if ext == '.rpm':
            jobs.append(arg)
        elif ext == '.spec':
            jobs.append([arg])
        else:
            if ext not in EXTENSIONS:
                LOG.warning("Uncommon source extension %s for file %s. "
                            "Please double check files." % (ext, arg))
            if not len(jobs) or not type(jobs[-1]) == type([]):
                LOG.error("Source file given without spec file.")
                sys.exit(1)
            jobs[-1].append(arg)
    system = read_preferences(opts)
    execute_jobs(opts, system, jobs)

if __name__ == '__main__':
    main()