python script for go cross-compile

go_crossbuild.py

#!/usr/bin/env pypy
 
import os
import subprocess
import sys

class Env(dict):
    def __init__(self):
            ALL_PLATFORMS=['darwin/amd64', 'linux/amd64', 'linux/386', 'linux/arm', 'freebsd/amd64', 'freebsd/386', 'windows/amd64', 'windows/386']
            envs = subprocess.check_output(['go', 'env']).strip()
            for kv in envs.split('\n'):
                k, v = kv.split('=')
                self[k] = v.split('\"')[1]
            host = '%s/%s' % (self['GOHOSTOS'], self['GOHOSTARCH'])
            ALL_PLATFORMS.remove(host)
            self['platforms'] = ALL_PLATFORMS

goenv = Env()

class Builder(dict):
    def __init__(self):
        self.update(self._env)
 
    def make(self):
        os.chdir('%s/src'%goenv['GOROOT'])
        cmd = ['./make.bash', '--no-clean']
        p1 = subprocess.Popen(cmd, env=self)
        p1.communicate()
 
    def build(self):
        cmd = ['go', 'build']
        p1 = subprocess.Popen(cmd, env=self)
        p1.communicate()
 
class CrossType(type):
    def __new__(cls, name, bases, dct):
        return type.__new__(cls, name, bases, dct)
    def __init__(cls, name, bases, dct):
        super(CrossType, cls).__init__(name, bases, dct)

def _genv(platform):
    _os, _arch = platform.split('/')
    _env = os.environ.copy()
    _env['GOOS'] = _os
    _env['GOARCH'] = _arch
    _env['CGO_ENABLED'] = '0'
    return _env

BuilderClasses = {}
for p in goenv['platforms']:
    BuilderClasses[p] = CrossType(p, (Builder,), {'_env': _genv(p)})

def main(args):
    b = BuilderClasses[args[0]]()
    call = getattr(b, args[1])
    call()
 
if __name__ == '__main__':
    main(sys.argv[1:])