path: root/scripts/lib/recipetool/create.py

# Recipe creation tool - create command plugin
#
# Copyright (C) 2014-2017 Intel Corporation
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

import sys
import os
import argparse
import glob
import fnmatch
import re
import json
import logging
import scriptutils
from urllib.parse import urlparse, urldefrag, urlsplit
import hashlib
import bb.fetch2
logger = logging.getLogger('recipetool')

tinfoil = None
plugins = None

def log_error_cond(message, debugonly):
    if debugonly:
        logger.debug(message)
    else:
        logger.error(message)

def log_info_cond(message, debugonly):
    if debugonly:
        logger.debug(message)
    else:
        logger.info(message)

def plugin_init(pluginlist):
    # Take a reference to the list so we can use it later
    global plugins
    plugins = pluginlist

def tinfoil_init(instance):
    global tinfoil
    tinfoil = instance

class RecipeHandler(object):
    recipelibmap = {}
    recipeheadermap = {}
    recipecmakefilemap = {}
    recipebinmap = {}

    def __init__(self):
        self._devtool = False

    @staticmethod
    def load_libmap(d):
        '''Load library->recipe mapping'''
        import oe.package

        if RecipeHandler.recipelibmap:
            return
        # First build up library->package mapping
        shlib_providers = oe.package.read_shlib_providers(d)
        libdir = d.getVar('libdir')
        base_libdir = d.getVar('base_libdir')
        libpaths = list(set([base_libdir, libdir]))
        libname_re = re.compile('^lib(.+)\.so.*$')
        pkglibmap = {}
        for lib, item in shlib_providers.items():
            for path, pkg in item.items():
                if path in libpaths:
                    res = libname_re.match(lib)
                    if res:
                        libname = res.group(1)
                        if not libname in pkglibmap:
                            pkglibmap[libname] = pkg[0]
                    else:
                        logger.debug('unable to extract library name from %s' % lib)

        # Now turn it into a library->recipe mapping
        pkgdata_dir = d.getVar('PKGDATA_DIR')
        for libname, pkg in pkglibmap.items():
            try:
                with open(os.path.join(pkgdata_dir, 'runtime', pkg)) as f:
                    for line in f:
                        if line.startswith('PN:'):
                            RecipeHandler.recipelibmap[libname] = line.split(':', 1)[-1].strip()
                            break
            except IOError as ioe:
                if ioe.errno == 2:
                    logger.warn('unable to find a pkgdata file for package %s' % pkg)
                else:
                    raise

        # Some overrides - these should be mapped to the virtual
        RecipeHandler.recipelibmap['GL'] = 'virtual/libgl'
        RecipeHandler.recipelibmap['EGL'] = 'virtual/egl'
        RecipeHandler.recipelibmap['GLESv2'] = 'virtual/libgles2'

    @staticmethod
    def load_devel_filemap(d):
        '''Build up development file->recipe mapping'''
        if RecipeHandler.recipeheadermap:
            return
        pkgdata_dir = d.getVar('PKGDATA_DIR')
        includedir = d.getVar('includedir')
        cmakedir = os.path.join(d.getVar('libdir'), 'cmake')
        for pkg in glob.glob(os.path.join(pkgdata_dir, 'runtime', '*-dev')):
            with open(os.path.join(pkgdata_dir, 'runtime', pkg)) as f:
                pn = None
                headers = []
                cmakefiles = []
                for line in f:
                    if line.startswith('PN:'):
                        pn = line.split(':', 1)[-1].strip()
                    elif line.startswith('FILES_INFO:'):
                        val = line.split(':', 1)[1].strip()
                        dictval = json.loads(val)
                        for fullpth in sorted(dictval):
                            if fullpth.startswith(includedir) and fullpth.endswith('.h'):
                                headers.append(os.path.relpath(fullpth, includedir))
                            elif fullpth.startswith(cmakedir) and fullpth.endswith('.cmake'):
                                cmakefiles.append(os.path.relpath(fullpth, cmakedir))
                if pn and headers:
                    for header in headers:
                        RecipeHandler.recipeheadermap[header] = pn
                if pn and cmakefiles:
                    for fn in cmakefiles:
                        RecipeHandler.recipecmakefilemap[fn] = pn

    @staticmethod
    def load_binmap(d):
        '''Build up native binary->recipe mapping'''
        if RecipeHandler.recipebinmap:
            return
        sstate_manifests = d.getVar('SSTATE_MANIFESTS')
        staging_bindir_native = d.getVar('STAGING_BINDIR_NATIVE')
        build_arch = d.getVar('BUILD_ARCH')
        fileprefix = 'manifest-%s-' % build_arch
        for fn in glob.glob(os.path.join(sstate_manifests, '%s*-native.populate_sysroot' % fileprefix)):
            with open(fn, 'r') as f:
                pn = os.path.basename(fn).rsplit('.', 1)[0][len(fileprefix):]
                for line in f:
                    if line.startswith(staging_bindir_native):
                        prog = os.path.basename(line.rstrip())
                        RecipeHandler.recipebinmap[prog] = pn

    @staticmethod
    def checkfiles(path, speclist, recursive=False, excludedirs=None):
        results = []
        if recursive:
            for root, dirs, files in os.walk(path, topdown=True):
                if excludedirs:
                    dirs[:] = [d for d in dirs if d not in excludedirs]
                for fn in files:
                    for spec in speclist:
                        if fnmatch.fnmatch(fn, spec):
                            results.append(os.path.join(root, fn))
        else:
            for spec in speclist:
                results.extend(glob.glob(os.path.join(path, spec)))
        return results

    @staticmethod
    def handle_depends(libdeps, pcdeps, deps, outlines, values, d):
        if pcdeps:
            recipemap = read_pkgconfig_provides(d)
        if libdeps:
            RecipeHandler.load_libmap(d)

        ignorelibs = ['socket']
        ignoredeps = ['gcc-runtime', 'glibc', 'uclibc', 'musl', 'tar-native', 'binutils-native', 'coreutils-native']

        unmappedpc = []
        pcdeps = list(set(pcdeps))
        for pcdep in pcdeps:
            if isinstance(pcdep, str):
                recipe = recipemap.get(pcdep, None)
                if recipe:
                    deps.append(recipe)
                else:
                    if not pcdep.startswith('$'):
                        unmappedpc.append(pcdep)
            else:
                for item in pcdep:
                    recipe = recipemap.get(pcdep, None)
                    if recipe:
                        deps.append(recipe)
                        break
                else:
                    unmappedpc.append('(%s)' % ' or '.join(pcdep))

        unmappedlibs = []
        for libdep in libdeps:
            if isinstance(libdep, tuple):
                lib, header = libdep
            else:
                lib = libdep
                header = None

            if lib in ignorelibs:
                logger.debug('Ignoring library dependency %s' % lib)
                continue

            recipe = RecipeHandler.recipelibmap.get(lib, None)
            if recipe:
                deps.append(recipe)
            elif recipe is None:
                if header:
                    RecipeHandler.load_devel_filemap(d)
                    recipe = RecipeHandler.recipeheadermap.get(header, None)
                    if recipe:
                        deps.append(recipe)
                    elif recipe is None:
                        unmappedlibs.append(lib)
                else:
                    unmappedlibs.append(lib)

        deps = set(deps).difference(set(ignoredeps))

        if unmappedpc:
            outlines.append('# NOTE: unable to map the following pkg-config dependencies: %s' % ' '.join(unmappedpc))
            outlines.append('#       (this is based on recipes that have previously been built and packaged)')

        if unmappedlibs:
            outlines.append('# NOTE: the following library dependencies are unknown, ignoring: %s' % ' '.join(list(set(unmappedlibs))))
            outlines.append('#       (this is based on recipes that have previously been built and packaged)')

        if deps:
            values['DEPENDS'] = ' '.join(deps)

    @staticmethod
    def genfunction(outlines, funcname, content, python=False, forcespace=False):
        if python:
            prefix = 'python '
        else:
            prefix = ''
        outlines.append('%s%s () {' % (prefix, funcname))
        if python or forcespace:
            indent = '    '
        else:
            indent = '\t'
        addnoop = not python
        for line in content:
            outlines.append('%s%s' % (indent, line))
            if addnoop:
                strippedline = line.lstrip()
                if strippedline and not strippedline.startswith('#'):
                    addnoop = False
        if addnoop:
            # Without this there'll be a syntax error
            outlines.append('%s:' % indent)
        outlines.append('}')
        outlines.append('')

    def process(self, srctree, classes, lines_before, lines_after, handled, extravalues):
        return False


def validate_pv(pv):
    if not pv or '_version' in pv.lower() or pv[0] not in '0123456789':
        return False
    return True

def determine_from_filename(srcfile):
    """Determine name and version from a filename"""
    if is_package(srcfile):
        # Force getting the value from the package metadata
        return None, None

    if '.tar.' in srcfile:
        namepart = srcfile.split('.tar.')[0]
    else:
        namepart = os.path.splitext(srcfile)[0]
    namepart = namepart.lower().replace('_', '-')
    if namepart.endswith('.src'):
        namepart = namepart[:-4]
    if namepart.endswith('.orig'):
        namepart = namepart[:-5]
    splitval = namepart.split('-')
    logger.debug('determine_from_filename: split name %s into: %s' % (srcfile, splitval))

    ver_re = re.compile('^v?[0-9]')

    pv = None
    pn = None
    if len(splitval) == 1:
        # Try to split the version out if there is no separator (or a .)
        res = re.match('^([^0-9]+)([0-9.]+.*)$', namepart)
        if res:
            if len(res.group(1)) > 1 and len(res.group(2)) > 1:
                pn = res.group(1).rstrip('.')
                pv = res.group(2)
        else:
            pn = namepart
    else:
        if splitval[-1] in ['source', 'src']:
            splitval.pop()
        if len(splitval) > 2 and re.match('^(alpha|beta|stable|release|rc[0-9]|pre[0-9]|p[0-9]|[0-9]{8})', splitval[-1]) and ver_re.match(splitval[-2]):
            pv = '-'.join(splitval[-2:])
            if pv.endswith('-release'):
                pv = pv[:-8]
            splitval = splitval[:-2]
        elif ver_re.match(splitval[-1]):
            pv = splitval.pop()
        pn = '-'.join(splitval)
        if pv and pv.startswith('v'):
            pv = pv[1:]
    logger.debug('determine_from_filename: name = "%s" version = "%s"' % (pn, pv))
    return (pn, pv)

def determine_from_url(srcuri):
    """Determine name and version from a URL"""
    pn = None
    pv = None
    parseres = urlparse(srcuri.lower().split(';', 1)[0])
    if parseres.path:
        if 'github.com' in parseres.netloc:
            res = re.search(r'.*/(.*?)/archive/(.*)-final\.(tar|zip)', parseres.path)
            if res:
                pn = res.group(1).strip().replace('_', '-')
                pv = res.group(2).strip().replace('_', '.')
            else:
                res = re.search(r'.*/(.*?)/archive/v?(.*)\.(tar|zip)', parseres.path)
                if res:
                    pn = res.group(1).strip().replace('_', '-')
                    pv = res.group(2).strip().replace('_', '.')
        elif 'bitbucket.org' in parseres.netloc:
            res = re.search(r'.*/(.*?)/get/[a-zA-Z_-]*([0-9][0-9a-zA-Z_.]*)\.(tar|zip)', parseres.path)
            if res:
                pn = res.group(1).strip().replace('_', '-')
                pv = res.group(2).strip().replace('_', '.')

        if not pn and not pv:
            if parseres.scheme not in ['git', 'gitsm', 'svn', 'hg']:
                srcfile = os.path.basename(parseres.path.rstrip('/'))
                pn, pv = determine_from_filename(srcfile)
            elif parseres.scheme in ['git', 'gitsm']:
                pn = os.path.basename(parseres.path.rstrip('/')).lower().replace('_', '-')
                if pn.endswith('.git'):
                    pn = pn[:-4]

    logger.debug('Determined from source URL: name = "%s", version = "%s"' % (pn, pv))
    return (pn, pv)

def supports_srcrev(uri):
    localdata = bb.data.createCopy(tinfoil.config_data)
    # This is a bit sad, but if you don't have this set there can be some
    # odd interactions with the urldata cache which lead to errors
    localdata.setVar('SRCREV', '${AUTOREV}')
    try:
        fetcher = bb.fetch2.Fetch([uri], localdata)
        urldata = fetcher.ud
        for u in urldata:
            if urldata[u].method.supports_srcrev():
                return True
    except bb.fetch2.FetchError as e:
        logger.debug('FetchError in supports_srcrev: %s' % str(e))
        # Fall back to basic check
        if uri.startswith(('git://', 'gitsm://')):
            return True
    return False

def reformat_git_uri(uri):
    '''Convert any http[s]://....git URI into git://...;protocol=http[s]'''
    checkuri = uri.split(';', 1)[0]
    if checkuri.endswith('.git') or '/git/' in checkuri or re.match('https?://github.com/[^/]+/[^/]+/?$', checkuri):
        # Appends scheme if the scheme is missing
        if not '://' in uri:
            uri = 'git://' + uri
        scheme, host, path, user, pswd, parms = bb.fetch2.decodeurl(uri)
        # Detection mechanism, this is required due to certain URL are formatter with ":" rather than "/"
        # which causes decodeurl to fail getting the right host and path
        if len(host.split(':')) > 1:
            splitslash = host.split(':')
            host = splitslash[0]
            path = '/' + splitslash[1] + path
        #Algorithm:
        # if user is defined, append protocol=ssh or if a protocol is defined, then honor the user-defined protocol
        # if no user & password is defined, check for scheme type and append the protocol with the scheme type
        # finally if protocols or if the url is well-formed, do nothing and rejoin everything back to normal
        # Need to repackage the arguments for encodeurl, the format is: (scheme, host, path, user, password, OrderedDict([('key', 'value')]))
        if user:
            if not 'protocol' in parms:
                parms.update({('protocol', 'ssh')})
        elif (scheme == "http" or scheme == 'https' or scheme == 'ssh') and not ('protocol' in parms):
            parms.update({('protocol', scheme)})
        # Always append 'git://'
        fUrl = bb.fetch2.encodeurl(('git', host, path, user, pswd, parms))
        return fUrl
    else:
        return uri

def is_package(url):
    '''Check if a URL points to a package'''
    checkurl = url.split(';', 1)[0]
    if checkurl.endswith(('.deb', '.ipk', '.rpm', '.srpm')):
        return True
    return False

def create_recipe(args):
    import bb.process
    import tempfile
    import shutil
    import oe.recipeutils

    pkgarch = ""
    if args.machine:
        pkgarch = "${MACHINE_ARCH}"

    extravalues = {}
    checksums = {}
    tempsrc = ''
    source = args.source
    srcsubdir = ''
    srcrev = '${AUTOREV}'
    srcbranch = ''
    scheme = ''
    storeTagName = ''
    pv_srcpv = False

    if os.path.isfile(source):
        source = 'file://%s' % os.path.abspath(source)

    if scriptutils.is_src_url(source):
        # Fetch a URL
        fetchuri = reformat_git_uri(urldefrag(source)[0])
        if args.binary:
            # Assume the archive contains the directory structure verbatim
            # so we need to extract to a subdirectory
            fetchuri += ';subdir=${BP}'
        srcuri = fetchuri
        rev_re = re.compile(';rev=([^;]+)')
        res = rev_re.search(srcuri)
        if res:
            if args.srcrev:
                logger.error('rev= parameter and -S/--srcrev option cannot both be specified - use one or the other')
                sys.exit(1)
            if args.autorev:
                logger.error('rev= parameter and -a/--autorev option cannot both be specified - use one or the other')
                sys.exit(1)
            srcrev = res.group(1)
            srcuri = rev_re.sub('', srcuri)
        elif args.srcrev:
            srcrev = args.srcrev

        # Check whether users provides any branch info in fetchuri.
        # If true, we will skip all branch checking process to honor all user's input.
        scheme, network, path, user, passwd, params = bb.fetch2.decodeurl(fetchuri)
        srcbranch = params.get('branch')
        if args.srcbranch:
            if srcbranch:
                logger.error('branch= parameter and -B/--srcbranch option cannot both be specified - use one or the other')
                sys.exit(1)
            srcbranch = args.srcbranch
        nobranch = params.get('nobranch')
        if nobranch and srcbranch:
            logger.error('nobranch= cannot be used if you specify a branch')
            sys.exit(1)
        tag = params.get('tag')
        if not srcbranch and not nobranch and srcrev != '${AUTOREV}':
            # Append nobranch=1 in the following conditions:
            # 1. User did not set 'branch=' in srcuri, and
            # 2. User did not set 'nobranch=1' in srcuri, and
            # 3. Source revision is not '${AUTOREV}'
            params['nobranch'] = '1'
        if tag:
            # Keep a copy of tag and append nobranch=1 then remove tag from URL.
            # Bitbake fetcher unable to fetch when {AUTOREV} and tag is set at the same time.
            # We will re-introduce tag argument after bitbake fetcher process is complete.
            storeTagName = params['tag']
            params['nobranch'] = '1'
            del params['tag']
        if scheme == 'npm':
            params['noverify'] = '1'
        fetchuri = bb.fetch2.encodeurl((scheme, network, path, user, passwd, params))

        tmpparent = tinfoil.config_data.getVar('BASE_WORKDIR')
        bb.utils.mkdirhier(tmpparent)
        tempsrc = tempfile.mkdtemp(prefix='recipetool-', dir=tmpparent)
        srctree = os.path.join(tempsrc, 'source')

        try:
            checksums, ftmpdir = scriptutils.fetch_url(tinfoil, fetchuri, srcrev, srctree, logger, preserve_tmp=args.keep_temp)
        except scriptutils.FetchUrlFailure as e:
            logger.error(str(e))
            sys.exit(1)

        if ftmpdir and args.keep_temp:
            logger.info('Fetch temp directory is %s' % ftmpdir)

        dirlist = os.listdir(srctree)
        filterout = ['git.indirectionsymlink']
        dirlist = [x for x in dirlist if x not in filterout]
        logger.debug('Directory listing (excluding filtered out):\n  %s' % '\n  '.join(dirlist))
        if len(dirlist) == 1:
            singleitem = os.path.join(srctree, dirlist[0])
            if os.path.isdir(singleitem):
                # We unpacked a single directory, so we should use that
                srcsubdir = dirlist[0]
                srctree = os.path.join(srctree, srcsubdir)
            else:
                check_single_file(dirlist[0], fetchuri)
        elif len(dirlist) == 0:
            if '/' in fetchuri:
                fn = os.path.join(tinfoil.config_data.getVar('DL_DIR'), fetchuri.split('/')[-1])
                if os.path.isfile(fn):
                    check_single_file(fn, fetchuri)
            # If we've got to here then there's no source so we might as well give up
            logger.error('URL %s resulted in an empty source tree' % fetchuri)
            sys.exit(1)

        # We need this checking mechanism to improve the recipe created by recipetool and devtool
        # is able to parse and build by bitbake.
        # If there is no input for branch name, then check for branch name with SRCREV provided.
        if not srcbranch and not nobranch and srcrev and (srcrev != '${AUTOREV}') and scheme in ['git', 'gitsm']:
            try:
                cmd = 'git branch -r --contains'
                check_branch, check_branch_err = bb.process.run('%s %s' % (cmd, srcrev), cwd=srctree)
            except bb.process.ExecutionError as err:
                logger.error(str(err))
                sys.exit(1)
            get_branch = [x.strip() for x in check_branch.splitlines()]
            # Remove HEAD reference point and drop remote prefix
            get_branch = [x.split('/', 1)[1] for x in get_branch if not x.startswith('origin/HEAD')]
            if 'master' in get_branch:
                # If it is master, we do not need to append 'branch=master' as this is default.
                # Even with the case where get_branch has multiple objects, if 'master' is one
                # of them, we should default take from 'master'
                srcbranch = ''
            elif len(get_branch) == 1:
                # If 'master' isn't in get_branch and get_branch contains only ONE object, then store result into 'srcbranch'
                srcbranch = get_branch[0]
            else:
                # If get_branch contains more than one objects, then display error and exit.
                mbrch = '\n  ' + '\n  '.join(get_branch)
                logger.error('Revision %s was found on multiple branches: %s\nPlease provide the correct branch with -B/--srcbranch' % (srcrev, mbrch))
                sys.exit(1)

        # Since we might have a value in srcbranch, we need to
        # recontruct the srcuri to include 'branch' in params.
        if srcbranch:
            scheme, network, path, user, passwd, params = bb.fetch2.decodeurl(srcuri)
            params['branch'] = srcbranch
            srcuri = bb.fetch2.encodeurl((scheme, network, path, user, passwd, params))

        if storeTagName and scheme in ['git', 'gitsm']:
            # Re-introduced tag variable from storeTagName
            # Check srcrev using tag and check validity of the tag
            cmd = ('git rev-parse --verify %s' % (storeTagName))
            try:
                check_tag, check_tag_err = bb.process.run('%s' % cmd, cwd=srctree)
                srcrev = check_tag.split()[0]
            except bb.process.ExecutionError as err:
                logger.error(str(err))
                logger.error("Possibly wrong tag name is provided")
                sys.exit(1)

        if os.path.exists(os.path.join(srctree, '.gitmodules')) and srcuri.startswith('git://'):
            srcuri = 'gitsm://' + srcuri[6:]
            logger.info('Fetching submodules...')
            bb.process.run('git submodule update --init --recursive', cwd=srctree)

        if is_package(fetchuri):
            localdata = bb.data.createCopy(tinfoil.config_data)
            pkgfile = bb.fetch2.localpath(fetchuri, localdata)
            if pkgfile:
                tmpfdir = tempfile.mkdtemp(prefix='recipetool-')
                try:
                    if pkgfile.endswith(('.deb', '.ipk')):
                        stdout, _ = bb.process.run('ar x %s' % pkgfile, cwd=tmpfdir)
                        stdout, _ = bb.process.run('tar xf control.tar.gz', cwd=tmpfdir)
                        values = convert_debian(tmpfdir)
                        extravalues.update(values)
                    elif pkgfile.endswith(('.rpm', '.srpm')):
                        stdout, _ = bb.process.run('rpm -qp --xml %s > pkginfo.xml' % pkgfile, cwd=tmpfdir)
                        values = convert_rpm_xml(os.path.join(tmpfdir, 'pkginfo.xml'))
                        extravalues.update(values)
                finally:
                    shutil.rmtree(tmpfdir)
    else:
        # Assume we're pointing to an existing source tree
        if args.extract_to:
            logger.error('--extract-to cannot be specified if source is a directory')
            sys.exit(1)
        if not os.path.isdir(source):
            logger.error('Invalid source directory %s' % source)
            sys.exit(1)
        srctree = source
        srcuri = ''
        if os.path.exists(os.path.join(srctree, '.git')):
            # Try to get upstream repo location from origin remote
            try:
                stdout, _ = bb.process.run('git remote -v', cwd=srctree, shell=True)
            except bb.process.ExecutionError as e:
                stdout = None
            if stdout:
                for line in stdout.splitlines():
                    splitline = line.split()
                    if len(splitline) > 1:
                        if splitline[0] == 'origin' and scriptutils.is_src_url(splitline[1]):
                            srcuri = reformat_git_uri(splitline[1])
                            srcsubdir = 'git'
                            break

    if args.src_subdir:
        srcsubdir = os.path.join(srcsubdir, args.src_subdir)
        srctree_use = os.path.abspath(os.path.join(srctree, args.src_subdir))
    else:
        srctree_use = os.path.abspath(srctree)

    if args.outfile and os.path.isdir(args.outfile):
        outfile = None
        outdir = args.outfile
    else:
        outfile = args.outfile
        outdir = None
    if outfile and outfile != '-':
        if os.path.exists(outfile):
            logger.error('Output file %s already exists' % outfile)
            sys.exit(1)

    lines_before = []
    lines_after = []

    lines_before.append('# Recipe created by %s' % os.path.basename(sys.argv[0]))
    lines_before.append('# This is the basis of a recipe and may need further editing in order to be fully functional.')
    lines_before.append('# (Feel free to remove these comments when editing.)')
    # We need a blank line here so that patch_recipe_lines can rewind before the LICENSE comments
    lines_before.append('')

    # We'll come back and replace this later in handle_license_vars()
    lines_before.append('##LICENSE_PLACEHOLDER##')

    handled = []
    classes = []

    # FIXME This is kind of a hack, we probably ought to be using bitbake to do this
    pn = None
    pv = None
    if outfile:
        recipefn = os.path.splitext(os.path.basename(outfile))[0]
        fnsplit = recipefn.split('_')
        if len(fnsplit) > 1:
            pn = fnsplit[0]
            pv = fnsplit[1]
        else:
            pn = recipefn

    if args.version:
        pv = args.version

    if args.name:
        pn = args.name
        if args.name.endswith('-native'):
            if args.also_native:
                logger.error('--also-native cannot be specified for a recipe named *-native (*-native denotes a recipe that is already only for native) - either remove the -native suffix from the name or drop --also-native')
                sys.exit(1)
            classes.append('native')
        elif args.name.startswith('nativesdk-'):
            if args.also_native:
                logger.error('--also-native cannot be specified for a recipe named nativesdk-* (nativesdk-* denotes a recipe that is already only for nativesdk)')
                sys.exit(1)
            classes.append('nativesdk')

    if pv and pv not in 'git svn hg'.split():
        realpv = pv
    else:
        realpv = None

    if not srcuri:
        lines_before.append('# No information for SRC_URI yet (only an external source tree was specified)')
    lines_before.append('SRC_URI = "%s"' % srcuri)
    for key, value in sorted(checksums.items()):
        lines_before.append('SRC_URI[%s] = "%s"' % (key, value))
    if srcuri and supports_srcrev(srcuri):
        lines_before.append('')
        lines_before.append('# Modify these as desired')
        # Note: we have code to replace realpv further down if it gets set to some other value
        scheme, _, _, _, _, _ = bb.fetch2.decodeurl(srcuri)
        if scheme in ['git', 'gitsm']:
            srcpvprefix = 'git'
        elif scheme == 'svn':
            srcpvprefix = 'svnr'
        else:
            srcpvprefix = scheme
        lines_before.append('PV = "%s+%s${SRCPV}"' % (realpv or '1.0', srcpvprefix))
        pv_srcpv = True
        if not args.autorev and srcrev == '${AUTOREV}':
            if os.path.exists(os.path.join(srctree, '.git')):
                (stdout, _) = bb.process.run('git rev-parse HEAD', cwd=srctree)
            srcrev = stdout.rstrip()
        lines_before.append('SRCREV = "%s"' % srcrev)
    if args.provides:
        lines_before.append('PROVIDES = "%s"' % args.provides)
    lines_before.append('')

    if srcsubdir and not args.binary:
        # (for binary packages we explicitly specify subdir= when fetching to
        # match the default value of S, so we don't need to set it in that case)
        lines_before.append('S = "${WORKDIR}/%s"' % srcsubdir)
        lines_before.append('')

    if pkgarch:
        lines_after.append('PACKAGE_ARCH = "%s"' % pkgarch)
        lines_after.append('')

    if args.binary:
        lines_after.append('INSANE_SKIP_${PN} += "already-stripped"')
        lines_after.append('')

    if args.fetch_dev:
        extravalues['fetchdev'] = True
    else:
        extravalues['fetchdev'] = None

    # Find all plugins that want to register handlers
    logger.debug('Loading recipe handlers')
    raw_handlers = []
    for plugin in plugins:
        if hasattr(plugin, 'register_recipe_handlers'):
            plugin.register_recipe_handlers(raw_handlers)
    # Sort handlers by priority
    handlers = []
    for i, handler in enumerate(raw_handlers):
        if isinstance(handler, tuple):
            handlers.append((handler[0], handler[1], i))
        else:
            handlers.append((handler, 0, i))
    handlers.sort(key=lambda item: (item[1], -item[2]), reverse=True)
    for handler, priority, _ in handlers:
        logger.debug('Handler: %s (priority %d)' % (handler.__class__.__name__, priority))
        setattr(handler, '_devtool', args.devtool)
    handlers = [item[0] for item in handlers]

    # Apply the handlers
    if args.binary:
        classes.append('bin_package')
        handled.append('buildsystem')

    for handler in handlers:
        handler.process(srctree_use, classes, lines_before, lines_after, handled, extravalues)

    extrafiles = extravalues.pop('extrafiles', {})
    extra_pn = extravalues.pop('PN', None)
    extra_pv = extravalues.pop('PV', None)

    if extra_pv and not realpv:
        realpv = extra_pv
        if not validate_pv(realpv):
            realpv = None
        else:
            realpv = realpv.lower().split()[0]
            if '_' in realpv:
                realpv = realpv.replace('_', '-')
    if extra_pn and not pn:
        pn = extra_pn
        if pn.startswith('GNU '):
            pn = pn[4:]
        if ' ' in pn:
            # Probably a descriptive identifier rather than a proper name
            pn = None
        else:
            pn = pn.lower()
            if '_' in pn:
                pn = pn.replace('_', '-')

    if srcuri and not realpv or not pn:
        name_pn, name_pv = determine_from_url(srcuri)
        if name_pn and not pn:
            pn = name_pn
        if name_pv and not realpv:
            realpv = name_pv

    licvalues = handle_license_vars(srctree_use, lines_before, handled, extravalues, tinfoil.config_data)

    if not outfile:
        if not pn:
            log_error_cond('Unable to determine short program name from source tree - please specify name with -N/--name or output file name with -o/--outfile', args.devtool)
            # devtool looks for this specific exit code, so don't change it
            sys.exit(15)
        else:
            if srcuri and srcuri.startswith(('gitsm://', 'git://', 'hg://', 'svn://')):
                suffix = srcuri.split(':', 1)[0]
                if suffix == 'gitsm':
                    suffix = 'git'
                outfile = '%s_%s.bb' % (pn, suffix)
            elif realpv:
                outfile = '%s_%s.bb' % (pn, realpv)
            else:
                outfile = '%s.bb' % pn
            if outdir:
                outfile = os.path.join(outdir, outfile)
            # We need to check this again
            if os.path.exists(outfile):
                logger.error('Output file %s already exists' % outfile)
                sys.exit(1)

    # Move any extra files the plugins created to a directory next to the recipe
    if extrafiles:
        if outfile == '-':
            extraoutdir = pn
        else:
            extraoutdir = os.path.join(os.path.dirname(outfile), pn)
        bb.utils.mkdirhier(extraoutdir)
        for destfn, extrafile in extrafiles.items():
            shutil.move(extrafile, os.path.join(extraoutdir, destfn))

    lines = lines_before
    lines_before = []
    skipblank = True
    for line in lines:
        if skipblank:
            skipblank = False
            if not line:
                continue
        if line.startswith('S = '):
            if realpv and pv not in 'git svn hg'.split():
                line = line.replace(realpv, '${PV}')
            if pn:
                line = line.replace(pn, '${BPN}')
            if line == 'S = "${WORKDIR}/${BPN}-${PV}"':
                skipblank = True
                continue
        elif line.startswith('SRC_URI = '):
            if realpv and not pv_srcpv:
                line = line.replace(realpv, '${PV}')
        elif line.startswith('PV = '):
            if realpv:
                # Replace the first part of the PV value
                line = re.sub('"[^+]*\+', '"%s+' % realpv, line)
        lines_before.append(line)

    if args.also_native:
        lines = lines_after
        lines_after = []
        bbclassextend = None
        for line in lines:
            if line.startswith('BBCLASSEXTEND ='):
                splitval = line.split('"')
                if len(splitval) > 1:
                    bbclassextend = splitval[1].split()
                    if not 'native' in bbclassextend:
                        bbclassextend.insert(0, 'native')
                line = 'BBCLASSEXTEND = "%s"' % ' '.join(bbclassextend)
            lines_after.append(line)
        if not bbclassextend:
            lines_after.append('BBCLASSEXTEND = "native"')

    postinst = ("postinst", extravalues.pop('postinst', None))
    postrm = ("postrm", extravalues.pop('postrm', None))
    preinst = ("preinst", extravalues.pop('preinst', None))
    prerm = ("prerm", extravalues.pop('prerm', None))
    funcs = [postinst, postrm, preinst, prerm]
    for func in funcs:
        if func[1]:
            RecipeHandler.genfunction(lines_after, 'pkg_%s_${PN}' % func[0], func[1])

    outlines = []
    outlines.extend(lines_before)
    if classes:
        if outlines[-1] and not outlines[-1].startswith('#'):
            outlines.append('')
        outlines.append('inherit %s' % ' '.join(classes))
        outlines.append('')
    outlines.extend(lines_after)

    if extravalues:
        _, outlines = oe.recipeutils.patch_recipe_lines(outlines, extravalues, trailing_newline=False)

    if args.extract_to:
        scriptutils.git_convert_standalone_clone(srctree)
        if os.path.isdir(args.extract_to):
            # If the directory exists we'll move the temp dir into it instead of
            # its contents - of course, we could try to always move its contents
            # but that is a pain if there are symlinks; the simplest solution is
            # to just remove it first
            os.rmdir(args.extract_to)
        shutil.move(srctree, args.extract_to)
        if tempsrc == srctree:
            tempsrc = None
        log_info_cond('Source extracted to %s' % args.extract_to, args.devtool)

    if outfile == '-':
        sys.stdout.write('\n'.join(outlines) + '\n')
    else:
        with open(outfile, 'w') as f:
            lastline = None
            for line in outlines:
                if not lastline and not line:
                    # Skip extra blank lines
                    continue
                f.write('%s\n' % line)
                lastline = line
        log_info_cond('Recipe %s has been created; further editing may be required to make it fully functional' % outfile, args.devtool)

    if tempsrc:
        if args.keep_temp:
            logger.info('Preserving temporary directory %s' % tempsrc)
        else:
            shutil.rmtree(tempsrc)

    return 0

def check_single_file(fn, fetchuri):
    """Determine if a single downloaded file is something we can't handle"""
    with open(fn, 'r', errors='surrogateescape') as f:
        if '<html' in f.read(100).lower():
            logger.error('Fetching "%s" returned a single HTML page - check the URL is correct and functional' % fetchuri)
            sys.exit(1)

def split_value(value):
    if isinstance(value, str):
        return value.split()
    else:
        return value

def handle_license_vars(srctree, lines_before, handled, extravalues, d):
    lichandled = [x for x in handled if x[0] == 'license']
    if lichandled:
        # Someone else has already handled the license vars, just return their value
        return lichandled[0][1]

    licvalues = guess_license(srctree, d)
    licenses = []
    lic_files_chksum = []
    lic_unknown = []
    lines = []
    if licvalues:
        for licvalue in licvalues:
            if not licvalue[0] in licenses:
                licenses.append(licvalue[0])
            lic_files_chksum.append('file://%s;md5=%s' % (licvalue[1], licvalue[2]))
            if licvalue[0] == 'Unknown':
                lic_unknown.append(licvalue[1])
        if lic_unknown:
            lines.append('#')
            lines.append('# The following license files were not able to be identified and are')
            lines.append('# represented as "Unknown" below, you will need to check them yourself:')
            for licfile in lic_unknown:
                lines.append('#   %s' % licfile)

    extra_license = split_value(extravalues.pop('LICENSE', []))
    if '&' in extra_license:
        extra_license.remove('&')
    if extra_license:
        if licenses == ['Unknown']:
            licenses = extra_license
        else:
            for item in extra_license:
                if item not in licenses:
                    licenses.append(item)
    extra_lic_files_chksum = split_value(extravalues.pop('LIC_FILES_CHKSUM', []))
    for item in extra_lic_files_chksum:
        if item not in lic_files_chksum:
            lic_files_chksum.append(item)

    if lic_files_chksum:
        # We are going to set the vars, so prepend the standard disclaimer
        lines.insert(0, '# WARNING: the following LICENSE and LIC_FILES_CHKSUM values are best guesses - it is')
        lines.insert(1, '# your responsibility to verify that the values are complete and correct.')
    else:
        # Without LIC_FILES_CHKSUM we set LICENSE = "CLOSED" to allow the
        # user to get started easily
        lines.append('# Unable to find any files that looked like license statements. Check the accompanying')
        lines.append('# documentation and source headers and set LICENSE and LIC_FILES_CHKSUM accordingly.')
        lines.append('#')
        lines.append('# NOTE: LICENSE is being set to "CLOSED" to allow you to at least start building - if')
        lines.append('# this is not accurate with respect to the licensing of the software being built (it')
        lines.append('# will not be in most cases) you must specify the correct value before using this')
        lines.append('# recipe for anything other than initial testing/development!')
        licenses = ['CLOSED']

    if extra_license and sorted(licenses) != sorted(extra_license):
        lines.append('# NOTE: Original package / source metadata indicates license is: %s' % ' & '.join(extra_license))

    if len(licenses) > 1:
        lines.append('#')
        lines.append('# NOTE: multiple licenses have been detected; they have been separated with &')
        lines.append('# in the LICENSE value for now since it is a reasonable assumption that all')
        lines.append('# of the licenses apply. If instead there is a choice between the multiple')
        lines.append('# licenses then you should change the value to separate the licenses with |')
        lines.append('# instead of &. If there is any doubt, check the accompanying documentation')
        lines.append('# to determine which situation is applicable.')

    lines.append('LICENSE = "%s"' % ' & '.join(licenses))
    lines.append('LIC_FILES_CHKSUM = "%s"' % ' \\\n                    '.join(lic_files_chksum))
    lines.append('')

    # Replace the placeholder so we get the values in the right place in the recipe file
    try:
        pos = lines_before.index('##LICENSE_PLACEHOLDER##')
    except ValueError:
        pos = -1
    if pos == -1:
        lines_before.extend(lines)
    else:
        lines_before[pos:pos+1] = lines

    handled.append(('license', licvalues))
    return licvalues

def get_license_md5sums(d, static_only=False):
    import bb.utils
    md5sums = {}
    if not static_only:
        # Gather md5sums of license files in common license dir
        commonlicdir = d.getVar('COMMON_LICENSE_DIR')
        for fn in os.listdir(commonlicdir):
            md5value = bb.utils.md5_file(os.path.join(commonlicdir, fn))
            md5sums[md5value] = fn
    # The following were extracted from common values in various recipes
    # (double checking the license against the license file itself, not just
    # the LICENSE value in the recipe)
    md5sums['94d55d512a9ba36caa9b7df079bae19f'] = 'GPLv2'
    md5sums['b234ee4d69f5fce4486a80fdaf4a4263'] = 'GPLv2'
    md5sums['59530bdf33659b29e73d4adb9f9f6552'] = 'GPLv2'
    md5sums['0636e73ff0215e8d672dc4c32c317bb3'] = 'GPLv2'
    md5sums['eb723b61539feef013de476e68b5c50a'] = 'GPLv2'
    md5sums['751419260aa954499f7abaabaa882bbe'] = 'GPLv2'
    md5sums['393a5ca445f6965873eca0259a17f833'] = 'GPLv2'
    md5sums['12f884d2ae1ff87c09e5b7ccc2c4ca7e'] = 'GPLv2'
    md5sums['8ca43cbc842c2336e835926c2166c28b'] = 'GPLv2'
    md5sums['ebb5c50ab7cab4baeffba14977030c07'] = 'GPLv2'
    md5sums['c93c0550bd3173f4504b2cbd8991e50b'] = 'GPLv2'
    md5sums['9ac2e7cff1ddaf48b6eab6028f23ef88'] = 'GPLv2'
    md5sums['4325afd396febcb659c36b49533135d4'] = 'GPLv2'
    md5sums['18810669f13b87348459e611d31ab760'] = 'GPLv2'
    md5sums['d7810fab7487fb0aad327b76f1be7cd7'] = 'GPLv2' # the Linux kernel's COPYING file
    md5sums['bbb461211a33b134d42ed5ee802b37ff'] = 'LGPLv2.1'
    md5sums['7fbc338309ac38fefcd64b04bb903e34'] = 'LGPLv2.1'
    md5sums['4fbd65380cdd255951079008b364516c'] = 'LGPLv2.1'
    md5sums['2d5025d4aa3495befef8f17206a5b0a1'] = 'LGPLv2.1'
    md5sums['fbc093901857fcd118f065f900982c24'] = 'LGPLv2.1'
    md5sums['a6f89e2100d9b6cdffcea4f398e37343'] = 'LGPLv2.1'
    md5sums['d8045f3b8f929c1cb29a1e3fd737b499'] = 'LGPLv2.1'
    md5sums['fad9b3332be894bab9bc501572864b29'] = 'LGPLv2.1'
    md5sums['3bf50002aefd002f49e7bb854063f7e7'] = 'LGPLv2'
    md5sums['9f604d8a4f8e74f4f5140845a21b6674'] = 'LGPLv2'
    md5sums['5f30f0716dfdd0d91eb439ebec522ec2'] = 'LGPLv2'
    md5sums['55ca817ccb7d5b5b66355690e9abc605'] = 'LGPLv2'
    md5sums['252890d9eee26aab7b432e8b8a616475'] = 'LGPLv2'
    md5sums['3214f080875748938ba060314b4f727d'] = 'LGPLv2'
    md5sums['db979804f025cf55aabec7129cb671ed'] = 'LGPLv2'
    md5sums['d32239bcb673463ab874e80d47fae504'] = 'GPLv3'
    md5sums['f27defe1e96c2e1ecd4e0c9be8967949'] = 'GPLv3'
    md5sums['6a6a8e020838b23406c81b19c1d46df6'] = 'LGPLv3'
    md5sums['3b83ef96387f14655fc854ddc3c6bd57'] = 'Apache-2.0'
    md5sums['385c55653886acac3821999a3ccd17b3'] = 'Artistic-1.0 | GPL-2.0' # some perl modules
    md5sums['54c7042be62e169199200bc6477f04d1'] = 'BSD-3-Clause'
    return md5sums

def crunch_license(licfile):
    '''
    Remove non-material text from a license file and then check
    its md5sum against a known list. This works well for licenses
    which contain a copyright statement, but is also a useful way
    to handle people's insistence upon reformatting the license text
    slightly (with no material difference to the text of the
    license).
    '''

    import oe.utils

    # Note: these are carefully constructed!
    license_title_re = re.compile('^\(?(#+ *)?(The )?.{1,10} [Ll]icen[sc]e( \(.{1,10}\))?\)?:?$')
    license_statement_re = re.compile('^(This (project|software) is( free software)? (released|licen[sc]ed)|(Released|Licen[cs]ed)) under the .{1,10} [Ll]icen[sc]e:?$')
    copyright_re = re.compile('^(#+)? *Copyright .*$')

    crunched_md5sums = {}
    # The following two were gleaned from the "forever" npm package
    crunched_md5sums['0a97f8e4cbaf889d6fa51f84b89a79f6'] = 'ISC'
    crunched_md5sums['eecf6429523cbc9693547cf2db790b5c'] = 'MIT'
    # https://github.com/vasi/pixz/blob/master/LICENSE
    crunched_md5sums['2f03392b40bbe663597b5bd3cc5ebdb9'] = 'BSD-2-Clause'
    # https://github.com/waffle-gl/waffle/blob/master/LICENSE.txt
    crunched_md5sums['e72e5dfef0b1a4ca8a3d26a60587db66'] = 'BSD-2-Clause'
    # https://github.com/spigwitmer/fakeds1963s/blob/master/LICENSE
    crunched_md5sums['8be76ac6d191671f347ee4916baa637e'] = 'GPLv2'
    # https://github.com/datto/dattobd/blob/master/COPYING
    # http://git.savannah.gnu.org/cgit/freetype/freetype2.git/tree/docs/GPLv2.TXT
    crunched_md5sums['1d65c5ad4bf6489f85f4812bf08ae73d'] = 'GPLv2'
    # http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
    # http://git.neil.brown.name/?p=mdadm.git;a=blob;f=COPYING;h=d159169d1050894d3ea3b98e1c965c4058208fe1;hb=HEAD
    crunched_md5sums['fb530f66a7a89ce920f0e912b5b66d4b'] = 'GPLv2'
    # https://github.com/gkos/nrf24/blob/master/COPYING
    crunched_md5sums['7b6aaa4daeafdfa6ed5443fd2684581b'] = 'GPLv2'
    # https://github.com/josch09/resetusb/blob/master/COPYING
    crunched_md5sums['8b8ac1d631a4d220342e83bcf1a1fbc3'] = 'GPLv3'
    # https://github.com/FFmpeg/FFmpeg/blob/master/COPYING.LGPLv2.1
    crunched_md5sums['2ea316ed973ae176e502e2297b574bb3'] = 'LGPLv2.1'
    # unixODBC-2.3.4 COPYING
    crunched_md5sums['1daebd9491d1e8426900b4fa5a422814'] = 'LGPLv2.1'
    # https://github.com/FFmpeg/FFmpeg/blob/master/COPYING.LGPLv3
    crunched_md5sums['2ebfb3bb49b9a48a075cc1425e7f4129'] = 'LGPLv3'
    # https://raw.githubusercontent.com/eclipse/mosquitto/v1.4.14/epl-v10
    crunched_md5sums['efe2cb9a35826992b9df68224e3c2628'] = 'EPL-1.0'
    # https://raw.githubusercontent.com/eclipse/mosquitto/v1.4.14/edl-v10
    crunched_md5sums['0a9c78c0a398d1bbce4a166757d60387'] = 'EDL-1.0'
    lictext = []
    with open(licfile, 'r', errors='surrogateescape') as f:
        for line in f:
            # Drop opening statements
            if copyright_re.match(line):
                continue
            elif license_title_re.match(line):
                continue
            elif license_statement_re.match(line):
                continue
            # Squash spaces, and replace smart quotes, double quotes
            # and backticks with single quotes
            line = oe.utils.squashspaces(line.strip())
            line = line.replace(u"\u2018", "'").replace(u"\u2019", "'").replace(u"\u201c","'").replace(u"\u201d", "'").replace('"', '\'').replace('`', '\'')
            if line:
                lictext.append(line)

    m = hashlib.md5()
    try:
        m.update(' '.join(lictext).encode('utf-8'))
        md5val = m.hexdigest()
    except UnicodeEncodeError:
        md5val = None
        lictext = ''
    license = crunched_md5sums.get(md5val, None)
    return license, md5val, lictext

def guess_license(srctree, d):
    import bb
    md5sums = get_license_md5sums(d)

    licenses = []
    licspecs = ['*LICEN[CS]E*', 'COPYING*', '*[Ll]icense*', 'LEGAL*', '[Ll]egal*', '*GPL*', 'README.lic*', 'COPYRIGHT*', '[Cc]opyright*', 'e[dp]l-v10']
    licfiles = []
    for root, dirs, files in os.walk(srctree):
        for fn in files:
            for spec in licspecs:
                if fnmatch.fnmatch(fn, spec):
                    fullpath = os.path.join(root, fn)
                    if not fullpath in licfiles:
                        licfiles.append(fullpath)
    for licfile in licfiles:
        md5value = bb.utils.md5_file(licfile)
        license = md5sums.get(md5value, None)
        if not license:
            license, crunched_md5, lictext = crunch_license(licfile)
            if not license:
                license = 'Unknown'
        licenses.append((license, os.path.relpath(licfile, srctree), md5value))

    # FIXME should we grab at least one source file with a license header and add that too?

    return licenses

def split_pkg_licenses(licvalues, packages, outlines, fallback_licenses=None, pn='${PN}'):
    """
    Given a list of (license, path, md5sum) as returned by guess_license(),
    a dict of package name to path mappings, write out a set of
    package-specific LICENSE values.
    """
    pkglicenses = {pn: []}
    for license, licpath, _ in licvalues:
        for pkgname, pkgpath in packages.items():
            if licpath.startswith(pkgpath + '/'):
                if pkgname in pkglicenses:
                    pkglicenses[pkgname].append(license)
                else:
                    pkglicenses[pkgname] = [license]
                break
        else:
            # Accumulate on the main package
            pkglicenses[pn].append(license)
    outlicenses = {}
    for pkgname in packages:
        license = ' '.join(list(set(pkglicenses.get(pkgname, ['Unknown'])))) or 'Unknown'
        if license == 'Unknown' and pkgname in fallback_licenses:
            license = fallback_licenses[pkgname]
        outlines.append('LICENSE_%s = "%s"' % (pkgname, license))
        outlicenses[pkgname] = license.split()
    return outlicenses

def read_pkgconfig_provides(d):
    pkgdatadir = d.getVar('PKGDATA_DIR')
    pkgmap = {}
    for fn in glob.glob(os.path.join(pkgdatadir, 'shlibs2', '*.pclist')):
        with open(fn, 'r') as f:
            for line in f:
                pkgmap[os.path.basename(line.rstrip())] = os.path.splitext(os.path.basename(fn))[0]
    recipemap = {}
    for pc, pkg in pkgmap.items():
        pkgdatafile = os.path.join(pkgdatadir, 'runtime', pkg)
        if os.path.exists(pkgdatafile):
            with open(pkgdatafile, 'r') as f:
                for line in f:
                    if line.startswith('PN: '):
                        recipemap[pc] = line.split(':', 1)[1].strip()
    return recipemap

def convert_debian(debpath):
    value_map = {'Package': 'PN',
                 'Version': 'PV',
                 'Section': 'SECTION',
                 'License': 'LICENSE',
                 'Homepage': 'HOMEPAGE'}

    # FIXME extend this mapping - perhaps use distro_alias.inc?
    depmap = {'libz-dev': 'zlib'}

    values = {}
    depends = []
    with open(os.path.join(debpath, 'control'), 'r', errors='surrogateescape') as f:
        indesc = False
        for line in f:
            if indesc:
                if line.startswith(' '):
                    if line.startswith(' This package contains'):
                        indesc = False
                    else:
                        if 'DESCRIPTION' in values:
                            values['DESCRIPTION'] += ' ' + line.strip()
                        else:
                            values['DESCRIPTION'] = line.strip()
                else:
                    indesc = False
            if not indesc:
                splitline = line.split(':', 1)
                if len(splitline) < 2:
                    continue
                key = splitline[0]
                value = splitline[1].strip()
                if key == 'Build-Depends':
                    for dep in value.split(','):
                        dep = dep.split()[0]
                        mapped = depmap.get(dep, '')
                        if mapped:
                            depends.append(mapped)
                elif key == 'Description':
                    values['SUMMARY'] = value
                    indesc = True
                else:
                    varname = value_map.get(key, None)
                    if varname:
                        values[varname] = value
    postinst = os.path.join(debpath, 'postinst')
    postrm = os.path.join(debpath, 'postrm')
    preinst = os.path.join(debpath, 'preinst')
    prerm = os.path.join(debpath, 'prerm')
    sfiles = [postinst, postrm, preinst, prerm]
    for sfile in sfiles:
        if os.path.isfile(sfile):
            logger.info("Converting %s file to recipe function..." %
                    os.path.basename(sfile).upper())
            content = []
            with open(sfile) as f:
                for line in f:
                    if "#!/" in line:
                        continue
                    line = line.rstrip("\n")
                    if line.strip():
                        content.append(line)
                if content:
                    values[os.path.basename(f.name)] = content

    #if depends:
    #    values['DEPENDS'] = ' '.join(depends)

    return values

def convert_rpm_xml(xmlfile):
    '''Converts the output from rpm -qp --xml to a set of variable values'''
    import xml.etree.ElementTree as ElementTree
    rpmtag_map = {'Name': 'PN',
                  'Version': 'PV',
                  'Summary': 'SUMMARY',
                  'Description': 'DESCRIPTION',
                  'License': 'LICENSE',
                  'Url': 'HOMEPAGE'}

    values = {}
    tree = ElementTree.parse(xmlfile)
    root = tree.getroot()
    for child in root:
        if child.tag == 'rpmTag':
            name = child.attrib.get('name', None)
            if name:
                varname = rpmtag_map.get(name, None)
                if varname:
                    values[varname] = child[0].text
    return values


def register_commands(subparsers):
    parser_create = subparsers.add_parser('create',
                                          help='Create a new recipe',
                                          description='Creates a new recipe from a source tree')
    parser_create.add_argument('source', help='Path or URL to source')
    parser_create.add_argument('-o', '--outfile', help='Specify filename for recipe to create')
    parser_create.add_argument('-p', '--provides', help='Specify an alias for the item provided by the recipe')
    parser_create.add_argument('-m', '--machine', help='Make recipe machine-specific as opposed to architecture-specific', action='store_true')
    parser_create.add_argument('-x', '--extract-to', metavar='EXTRACTPATH', help='Assuming source is a URL, fetch it and extract it to the directory specified as %(metavar)s')
    parser_create.add_argument('-N', '--name', help='Name to use within recipe (PN)')
    parser_create.add_argument('-V', '--version', help='Version to use within recipe (PV)')
    parser_create.add_argument('-b', '--binary', help='Treat the source tree as something that should be installed verbatim (no compilation, same directory structure)', action='store_true')
    parser_create.add_argument('--also-native', help='Also add native variant (i.e. support building recipe for the build host as well as the target machine)', action='store_true')
    parser_create.add_argument('--src-subdir', help='Specify subdirectory within source tree to use', metavar='SUBDIR')
    group = parser_create.add_mutually_exclusive_group()
    group.add_argument('-a', '--autorev', help='When fetching from a git repository, set SRCREV in the recipe to a floating revision instead of fixed', action="store_true")
    group.add_argument('-S', '--srcrev', help='Source revision to fetch if fetching from an SCM such as git (default latest)')
    parser_create.add_argument('-B', '--srcbranch', help='Branch in source repository if fetching from an SCM such as git (default master)')
    parser_create.add_argument('--keep-temp', action="store_true", help='Keep temporary directory (for debugging)')
    parser_create.add_argument('--fetch-dev', action="store_true", help='For npm, also fetch devDependencies')
    parser_create.add_argument('--devtool', action="store_true", help=argparse.SUPPRESS)
    parser_create.add_argument('--mirrors', action="store_true", help='Enable PREMIRRORS and MIRRORS for source tree fetching (disabled by default).')
    parser_create.set_defaults(func=create_recipe)