path: root/meta/lib/oe/recipeutils.py

# Utility functions for reading and modifying recipes
#
# Some code borrowed from the OE layer index
#
# Copyright (C) 2013-2016 Intel Corporation
#

import sys
import os
import os.path
import tempfile
import textwrap
import difflib
from . import utils
import shutil
import re
import fnmatch
import glob
from collections import OrderedDict, defaultdict


# Help us to find places to insert values
recipe_progression = ['SUMMARY', 'DESCRIPTION', 'HOMEPAGE', 'BUGTRACKER', 'SECTION', 'LICENSE', 'LICENSE_FLAGS', 'LIC_FILES_CHKSUM', 'PROVIDES', 'DEPENDS', 'PR', 'PV', 'SRCREV', 'SRCPV', 'SRC_URI', 'S', 'do_fetch()', 'do_unpack()', 'do_patch()', 'EXTRA_OECONF', 'EXTRA_OECMAKE', 'EXTRA_OESCONS', 'do_configure()', 'EXTRA_OEMAKE', 'do_compile()', 'do_install()', 'do_populate_sysroot()', 'INITSCRIPT', 'USERADD', 'GROUPADD', 'PACKAGES', 'FILES', 'RDEPENDS', 'RRECOMMENDS', 'RSUGGESTS', 'RPROVIDES', 'RREPLACES', 'RCONFLICTS', 'ALLOW_EMPTY', 'populate_packages()', 'do_package()', 'do_deploy()']
# Variables that sometimes are a bit long but shouldn't be wrapped
nowrap_vars = ['SUMMARY', 'HOMEPAGE', 'BUGTRACKER', 'SRC_URI[md5sum]', 'SRC_URI[sha256sum]']
list_vars = ['SRC_URI', 'LIC_FILES_CHKSUM']
meta_vars = ['SUMMARY', 'DESCRIPTION', 'HOMEPAGE', 'BUGTRACKER', 'SECTION']


def pn_to_recipe(cooker, pn, mc=''):
    """Convert a recipe name (PN) to the path to the recipe file"""

    best = cooker.findBestProvider(pn, mc)
    return best[3]


def get_unavailable_reasons(cooker, pn):
    """If a recipe could not be found, find out why if possible"""
    import bb.taskdata
    taskdata = bb.taskdata.TaskData(None, skiplist=cooker.skiplist)
    return taskdata.get_reasons(pn)


def parse_recipe(cooker, fn, appendfiles):
    """
    Parse an individual recipe file, optionally with a list of
    bbappend files.
    """
    import bb.cache
    parser = bb.cache.NoCache(cooker.databuilder)
    envdata = parser.loadDataFull(fn, appendfiles)
    return envdata


def get_var_files(fn, varlist, d):
    """Find the file in which each of a list of variables is set.
    Note: requires variable history to be enabled when parsing.
    """
    varfiles = {}
    for v in varlist:
        history = d.varhistory.variable(v)
        files = []
        for event in history:
            if 'file' in event and not 'flag' in event:
                files.append(event['file'])
        if files:
            actualfile = files[-1]
        else:
            actualfile = None
        varfiles[v] = actualfile

    return varfiles


def split_var_value(value, assignment=True):
    """
    Split a space-separated variable's value into a list of items,
    taking into account that some of the items might be made up of
    expressions containing spaces that should not be split.
    Parameters:
        value:
            The string value to split
        assignment:
            True to assume that the value represents an assignment
            statement, False otherwise. If True, and an assignment
            statement is passed in the first item in
            the returned list will be the part of the assignment
            statement up to and including the opening quote character,
            and the last item will be the closing quote.
    """
    inexpr = 0
    lastchar = None
    out = []
    buf = ''
    for char in value:
        if char == '{':
            if lastchar == '$':
                inexpr += 1
        elif char == '}':
            inexpr -= 1
        elif assignment and char in '"\'' and inexpr == 0:
            if buf:
                out.append(buf)
            out.append(char)
            char = ''
            buf = ''
        elif char.isspace() and inexpr == 0:
            char = ''
            if buf:
                out.append(buf)
            buf = ''
        buf += char
        lastchar = char
    if buf:
        out.append(buf)

    # Join together assignment statement and opening quote
    outlist = out
    if assignment:
        assigfound = False
        for idx, item in enumerate(out):
            if '=' in item:
                assigfound = True
            if assigfound:
                if '"' in item or "'" in item:
                    outlist = [' '.join(out[:idx+1])]
                    outlist.extend(out[idx+1:])
                    break
    return outlist


def patch_recipe_lines(fromlines, values, trailing_newline=True):
    """Update or insert variable values into lines from a recipe.
       Note that some manual inspection/intervention may be required
       since this cannot handle all situations.
    """

    import bb.utils

    if trailing_newline:
        newline = '\n'
    else:
        newline = ''

    recipe_progression_res = []
    recipe_progression_restrs = []
    for item in recipe_progression:
        if item.endswith('()'):
            key = item[:-2]
        else:
            key = item
        restr = '%s(_[a-zA-Z0-9-_$(){}]+|\[[^\]]*\])?' % key
        if item.endswith('()'):
            recipe_progression_restrs.append(restr + '()')
        else:
            recipe_progression_restrs.append(restr)
        recipe_progression_res.append(re.compile('^%s$' % restr))

    def get_recipe_pos(variable):
        for i, p in enumerate(recipe_progression_res):
            if p.match(variable):
                return i
        return -1

    remainingnames = {}
    for k in values.keys():
        remainingnames[k] = get_recipe_pos(k)
    remainingnames = OrderedDict(sorted(remainingnames.items(), key=lambda x: x[1]))

    modifying = False

    def outputvalue(name, lines, rewindcomments=False):
        if values[name] is None:
            return
        rawtext = '%s = "%s"%s' % (name, values[name], newline)
        addlines = []
        if name in nowrap_vars:
            addlines.append(rawtext)
        elif name in list_vars:
            splitvalue = split_var_value(values[name], assignment=False)
            if len(splitvalue) > 1:
                linesplit = ' \\\n' + (' ' * (len(name) + 4))
                addlines.append('%s = "%s%s"%s' % (name, linesplit.join(splitvalue), linesplit, newline))
            else:
                addlines.append(rawtext)
        else:
            wrapped = textwrap.wrap(rawtext)
            for wrapline in wrapped[:-1]:
                addlines.append('%s \\%s' % (wrapline, newline))
            addlines.append('%s%s' % (wrapped[-1], newline))
        if rewindcomments:
            # Ensure we insert the lines before any leading comments
            # (that we'd want to ensure remain leading the next value)
            for i, ln in reversed(list(enumerate(lines))):
                if not ln.startswith('#'):
                    lines[i+1:i+1] = addlines
                    break
            else:
                lines.extend(addlines)
        else:
            lines.extend(addlines)

    existingnames = []
    def patch_recipe_varfunc(varname, origvalue, op, newlines):
        if modifying:
            # Insert anything that should come before this variable
            pos = get_recipe_pos(varname)
            for k in list(remainingnames):
                if remainingnames[k] > -1 and pos >= remainingnames[k] and not k in existingnames:
                    outputvalue(k, newlines, rewindcomments=True)
                    del remainingnames[k]
            # Now change this variable, if it needs to be changed
            if varname in existingnames and op in ['+=', '=', '=+']:
                if varname in remainingnames:
                    outputvalue(varname, newlines)
                    del remainingnames[varname]
                return None, None, 0, True
        else:
            if varname in values:
                existingnames.append(varname)
        return origvalue, None, 0, True

    # First run - establish which values we want to set are already in the file
    varlist = [re.escape(item) for item in values.keys()]
    bb.utils.edit_metadata(fromlines, varlist, patch_recipe_varfunc)
    # Second run - actually set everything
    modifying = True
    varlist.extend(recipe_progression_restrs)
    changed, tolines = bb.utils.edit_metadata(fromlines, varlist, patch_recipe_varfunc, match_overrides=True)

    if remainingnames:
        if tolines and tolines[-1].strip() != '':
            tolines.append('\n')
        for k in remainingnames.keys():
            outputvalue(k, tolines)

    return changed, tolines


def patch_recipe_file(fn, values, patch=False, relpath=''):
    """Update or insert variable values into a recipe file (assuming you
       have already identified the exact file you want to update.)
       Note that some manual inspection/intervention may be required
       since this cannot handle all situations.
    """

    with open(fn, 'r') as f:
        fromlines = f.readlines()

    _, tolines = patch_recipe_lines(fromlines, values)

    if patch:
        relfn = os.path.relpath(fn, relpath)
        diff = difflib.unified_diff(fromlines, tolines, 'a/%s' % relfn, 'b/%s' % relfn)
        return diff
    else:
        with open(fn, 'w') as f:
            f.writelines(tolines)
        return None


def localise_file_vars(fn, varfiles, varlist):
    """Given a list of variables and variable history (fetched with get_var_files())
    find where each variable should be set/changed. This handles for example where a
    recipe includes an inc file where variables might be changed - in most cases
    we want to update the inc file when changing the variable value rather than adding
    it to the recipe itself.
    """
    fndir = os.path.dirname(fn) + os.sep

    first_meta_file = None
    for v in meta_vars:
        f = varfiles.get(v, None)
        if f:
            actualdir = os.path.dirname(f) + os.sep
            if actualdir.startswith(fndir):
                first_meta_file = f
                break

    filevars = defaultdict(list)
    for v in varlist:
        f = varfiles[v]
        # Only return files that are in the same directory as the recipe or in some directory below there
        # (this excludes bbclass files and common inc files that wouldn't be appropriate to set the variable
        # in if we were going to set a value specific to this recipe)
        if f:
            actualfile = f
        else:
            # Variable isn't in a file, if it's one of the "meta" vars, use the first file with a meta var in it
            if first_meta_file:
                actualfile = first_meta_file
            else:
                actualfile = fn

        actualdir = os.path.dirname(actualfile) + os.sep
        if not actualdir.startswith(fndir):
            actualfile = fn
        filevars[actualfile].append(v)

    return filevars

def patch_recipe(d, fn, varvalues, patch=False, relpath=''):
    """Modify a list of variable values in the specified recipe. Handles inc files if
    used by the recipe.
    """
    varlist = varvalues.keys()
    varfiles = get_var_files(fn, varlist, d)
    locs = localise_file_vars(fn, varfiles, varlist)
    patches = []
    for f,v in locs.items():
        vals = {k: varvalues[k] for k in v}
        patchdata = patch_recipe_file(f, vals, patch, relpath)
        if patch:
            patches.append(patchdata)

    if patch:
        return patches
    else:
        return None



def copy_recipe_files(d, tgt_dir, whole_dir=False, download=True):
    """Copy (local) recipe files, including both files included via include/require,
    and files referred to in the SRC_URI variable."""
    import bb.fetch2
    import oe.path

    # FIXME need a warning if the unexpanded SRC_URI value contains variable references

    uris = (d.getVar('SRC_URI', True) or "").split()
    fetch = bb.fetch2.Fetch(uris, d)
    if download:
        fetch.download()

    # Copy local files to target directory and gather any remote files
    bb_dir = os.path.dirname(d.getVar('FILE', True)) + os.sep
    remotes = []
    copied = []
    includes = [path for path in d.getVar('BBINCLUDED', True).split() if
                path.startswith(bb_dir) and os.path.exists(path)]
    for path in fetch.localpaths() + includes:
        # Only import files that are under the meta directory
        if path.startswith(bb_dir):
            if not whole_dir:
                relpath = os.path.relpath(path, bb_dir)
                subdir = os.path.join(tgt_dir, os.path.dirname(relpath))
                if not os.path.exists(subdir):
                    os.makedirs(subdir)
                shutil.copy2(path, os.path.join(tgt_dir, relpath))
                copied.append(relpath)
        else:
            remotes.append(path)
    # Simply copy whole meta dir, if requested
    if whole_dir:
        shutil.copytree(bb_dir, tgt_dir)

    return copied, remotes


def get_recipe_local_files(d, patches=False, archives=False):
    """Get a list of local files in SRC_URI within a recipe."""
    import oe.patch
    uris = (d.getVar('SRC_URI', True) or "").split()
    fetch = bb.fetch2.Fetch(uris, d)
    # FIXME this list should be factored out somewhere else (such as the
    # fetcher) though note that this only encompasses actual container formats
    # i.e. that can contain multiple files as opposed to those that only
    # contain a compressed stream (i.e. .tar.gz as opposed to just .gz)
    archive_exts = ['.tar', '.tgz', '.tar.gz', '.tar.Z', '.tbz', '.tbz2', '.tar.bz2', '.tar.xz', '.tar.lz', '.zip', '.jar', '.rpm', '.srpm', '.deb', '.ipk', '.tar.7z', '.7z']
    ret = {}
    for uri in uris:
        if fetch.ud[uri].type == 'file':
            if (not patches and
                    oe.patch.patch_path(uri, fetch, '', expand=False)):
                continue
            # Skip files that are referenced by absolute path
            fname = fetch.ud[uri].basepath
            if os.path.isabs(fname):
                continue
            # Handle subdir=
            subdir = fetch.ud[uri].parm.get('subdir', '')
            if subdir:
                if os.path.isabs(subdir):
                    continue
                fname = os.path.join(subdir, fname)
            localpath = fetch.localpath(uri)
            if not archives:
                # Ignore archives that will be unpacked
                if localpath.endswith(tuple(archive_exts)):
                    unpack = fetch.ud[uri].parm.get('unpack', True)
                    if unpack:
                        continue
            ret[fname] = localpath
    return ret


def get_recipe_patches(d):
    """Get a list of the patches included in SRC_URI within a recipe."""
    import oe.patch
    patches = oe.patch.src_patches(d, expand=False)
    patchfiles = []
    for patch in patches:
        _, _, local, _, _, parm = bb.fetch.decodeurl(patch)
        patchfiles.append(local)
    return patchfiles


def get_recipe_patched_files(d):
    """
    Get the list of patches for a recipe along with the files each patch modifies.
    Params:
        d: the datastore for the recipe
    Returns:
        a dict mapping patch file path to a list of tuples of changed files and
        change mode ('A' for add, 'D' for delete or 'M' for modify)
    """
    import oe.patch
    patches = oe.patch.src_patches(d, expand=False)
    patchedfiles = {}
    for patch in patches:
        _, _, patchfile, _, _, parm = bb.fetch.decodeurl(patch)
        striplevel = int(parm['striplevel'])
        patchedfiles[patchfile] = oe.patch.PatchSet.getPatchedFiles(patchfile, striplevel, os.path.join(d.getVar('S', True), parm.get('patchdir', '')))
    return patchedfiles


def validate_pn(pn):
    """Perform validation on a recipe name (PN) for a new recipe."""
    reserved_names = ['forcevariable', 'append', 'prepend', 'remove']
    if not re.match('^[0-9a-z-.+]+$', pn):
        return 'Recipe name "%s" is invalid: only characters 0-9, a-z, -, + and . are allowed' % pn
    elif pn in reserved_names:
        return 'Recipe name "%s" is invalid: is a reserved keyword' % pn
    elif pn.startswith('pn-'):
        return 'Recipe name "%s" is invalid: names starting with "pn-" are reserved' % pn
    elif pn.endswith(('.bb', '.bbappend', '.bbclass', '.inc', '.conf')):
        return 'Recipe name "%s" is invalid: should be just a name, not a file name' % pn
    return ''


def get_bbfile_path(d, destdir, extrapathhint=None):
    """
    Determine the correct path for a recipe within a layer
    Parameters:
        d: Recipe-specific datastore
        destdir: destination directory. Can be the path to the base of the layer or a
            partial path somewhere within the layer.
        extrapathhint: a path relative to the base of the layer to try
    """
    import bb.cookerdata

    destdir = os.path.abspath(destdir)
    destlayerdir = find_layerdir(destdir)

    # Parse the specified layer's layer.conf file directly, in case the layer isn't in bblayers.conf
    confdata = d.createCopy()
    confdata.setVar('BBFILES', '')
    confdata.setVar('LAYERDIR', destlayerdir)
    destlayerconf = os.path.join(destlayerdir, "conf", "layer.conf")
    confdata = bb.cookerdata.parse_config_file(destlayerconf, confdata)
    pn = d.getVar('PN', True)

    bbfilespecs = (confdata.getVar('BBFILES', True) or '').split()
    if destdir == destlayerdir:
        for bbfilespec in bbfilespecs:
            if not bbfilespec.endswith('.bbappend'):
                for match in glob.glob(bbfilespec):
                    splitext = os.path.splitext(os.path.basename(match))
                    if splitext[1] == '.bb':
                        mpn = splitext[0].split('_')[0]
                        if mpn == pn:
                            return os.path.dirname(match)

    # Try to make up a path that matches BBFILES
    # this is a little crude, but better than nothing
    bpn = d.getVar('BPN', True)
    recipefn = os.path.basename(d.getVar('FILE', True))
    pathoptions = [destdir]
    if extrapathhint:
        pathoptions.append(os.path.join(destdir, extrapathhint))
    if destdir == destlayerdir:
        pathoptions.append(os.path.join(destdir, 'recipes-%s' % bpn, bpn))
        pathoptions.append(os.path.join(destdir, 'recipes', bpn))
        pathoptions.append(os.path.join(destdir, bpn))
    elif not destdir.endswith(('/' + pn, '/' + bpn)):
        pathoptions.append(os.path.join(destdir, bpn))
    closepath = ''
    for pathoption in pathoptions:
        bbfilepath = os.path.join(pathoption, 'test.bb')
        for bbfilespec in bbfilespecs:
            if fnmatch.fnmatchcase(bbfilepath, bbfilespec):
                return pathoption
    return None

def get_bbappend_path(d, destlayerdir, wildcardver=False):
    """Determine how a bbappend for a recipe should be named and located within another layer"""

    import bb.cookerdata

    destlayerdir = os.path.abspath(destlayerdir)
    recipefile = d.getVar('FILE', True)
    recipefn = os.path.splitext(os.path.basename(recipefile))[0]
    if wildcardver and '_' in recipefn:
        recipefn = recipefn.split('_', 1)[0] + '_%'
    appendfn = recipefn + '.bbappend'

    # Parse the specified layer's layer.conf file directly, in case the layer isn't in bblayers.conf
    confdata = d.createCopy()
    confdata.setVar('BBFILES', '')
    confdata.setVar('LAYERDIR', destlayerdir)
    destlayerconf = os.path.join(destlayerdir, "conf", "layer.conf")
    confdata = bb.cookerdata.parse_config_file(destlayerconf, confdata)

    origlayerdir = find_layerdir(recipefile)
    if not origlayerdir:
        return (None, False)
    # Now join this to the path where the bbappend is going and check if it is covered by BBFILES
    appendpath = os.path.join(destlayerdir, os.path.relpath(os.path.dirname(recipefile), origlayerdir), appendfn)
    closepath = ''
    pathok = True
    for bbfilespec in confdata.getVar('BBFILES', True).split():
        if fnmatch.fnmatchcase(appendpath, bbfilespec):
            # Our append path works, we're done
            break
        elif bbfilespec.startswith(destlayerdir) and fnmatch.fnmatchcase('test.bbappend', os.path.basename(bbfilespec)):
            # Try to find the longest matching path
            if len(bbfilespec) > len(closepath):
                closepath = bbfilespec
    else:
        # Unfortunately the bbappend layer and the original recipe's layer don't have the same structure
        if closepath:
            # bbappend layer's layer.conf at least has a spec that picks up .bbappend files
            # Now we just need to substitute out any wildcards
            appendsubdir = os.path.relpath(os.path.dirname(closepath), destlayerdir)
            if 'recipes-*' in appendsubdir:
                # Try to copy this part from the original recipe path
                res = re.search('/recipes-[^/]+/', recipefile)
                if res:
                    appendsubdir = appendsubdir.replace('/recipes-*/', res.group(0))
            # This is crude, but we have to do something
            appendsubdir = appendsubdir.replace('*', recipefn.split('_')[0])
            appendsubdir = appendsubdir.replace('?', 'a')
            appendpath = os.path.join(destlayerdir, appendsubdir, appendfn)
        else:
            pathok = False
    return (appendpath, pathok)


def bbappend_recipe(rd, destlayerdir, srcfiles, install=None, wildcardver=False, machine=None, extralines=None, removevalues=None):
    """
    Writes a bbappend file for a recipe
    Parameters:
        rd: data dictionary for the recipe
        destlayerdir: base directory of the layer to place the bbappend in
            (subdirectory path from there will be determined automatically)
        srcfiles: dict of source files to add to SRC_URI, where the value
            is the full path to the file to be added, and the value is the
            original filename as it would appear in SRC_URI or None if it
            isn't already present. You may pass None for this parameter if
            you simply want to specify your own content via the extralines
            parameter.
        install: dict mapping entries in srcfiles to a tuple of two elements:
            install path (*without* ${D} prefix) and permission value (as a
            string, e.g. '0644').
        wildcardver: True to use a % wildcard in the bbappend filename, or
            False to make the bbappend specific to the recipe version.
        machine:
            If specified, make the changes in the bbappend specific to this
            machine. This will also cause PACKAGE_ARCH = "${MACHINE_ARCH}"
            to be added to the bbappend.
        extralines:
            Extra lines to add to the bbappend. This may be a dict of name
            value pairs, or simply a list of the lines.
        removevalues:
            Variable values to remove - a dict of names/values.
    """

    if not removevalues:
        removevalues = {}

    # Determine how the bbappend should be named
    appendpath, pathok = get_bbappend_path(rd, destlayerdir, wildcardver)
    if not appendpath:
        bb.error('Unable to determine layer directory containing %s' % recipefile)
        return (None, None)
    if not pathok:
        bb.warn('Unable to determine correct subdirectory path for bbappend file - check that what %s adds to BBFILES also matches .bbappend files. Using %s for now, but until you fix this the bbappend will not be applied.' % (os.path.join(destlayerdir, 'conf', 'layer.conf'), os.path.dirname(appendpath)))

    appenddir = os.path.dirname(appendpath)
    bb.utils.mkdirhier(appenddir)

    # FIXME check if the bbappend doesn't get overridden by a higher priority layer?

    layerdirs = [os.path.abspath(layerdir) for layerdir in rd.getVar('BBLAYERS', True).split()]
    if not os.path.abspath(destlayerdir) in layerdirs:
        bb.warn('Specified layer is not currently enabled in bblayers.conf, you will need to add it before this bbappend will be active')

    bbappendlines = []
    if extralines:
        if isinstance(extralines, dict):
            for name, value in extralines.items():
                bbappendlines.append((name, '=', value))
        else:
            # Do our best to split it
            for line in extralines:
                if line[-1] == '\n':
                    line = line[:-1]
                splitline = line.split(None, 2)
                if len(splitline) == 3:
                    bbappendlines.append(tuple(splitline))
                else:
                    raise Exception('Invalid extralines value passed')

    def popline(varname):
        for i in range(0, len(bbappendlines)):
            if bbappendlines[i][0] == varname:
                line = bbappendlines.pop(i)
                return line
        return None

    def appendline(varname, op, value):
        for i in range(0, len(bbappendlines)):
            item = bbappendlines[i]
            if item[0] == varname:
                bbappendlines[i] = (item[0], item[1], item[2] + ' ' + value)
                break
        else:
            bbappendlines.append((varname, op, value))

    destsubdir = rd.getVar('PN', True)
    if srcfiles:
        bbappendlines.append(('FILESEXTRAPATHS_prepend', ':=', '${THISDIR}/${PN}:'))

    appendoverride = ''
    if machine:
        bbappendlines.append(('PACKAGE_ARCH', '=', '${MACHINE_ARCH}'))
        appendoverride = '_%s' % machine
    copyfiles = {}
    if srcfiles:
        instfunclines = []
        for newfile, origsrcfile in srcfiles.items():
            srcfile = origsrcfile
            srcurientry = None
            if not srcfile:
                srcfile = os.path.basename(newfile)
                srcurientry = 'file://%s' % srcfile
                # Double-check it's not there already
                # FIXME do we care if the entry is added by another bbappend that might go away?
                if not srcurientry in rd.getVar('SRC_URI', True).split():
                    if machine:
                        appendline('SRC_URI_append%s' % appendoverride, '=', ' ' + srcurientry)
                    else:
                        appendline('SRC_URI', '+=', srcurientry)
            copyfiles[newfile] = srcfile
            if install:
                institem = install.pop(newfile, None)
                if institem:
                    (destpath, perms) = institem
                    instdestpath = replace_dir_vars(destpath, rd)
                    instdirline = 'install -d ${D}%s' % os.path.dirname(instdestpath)
                    if not instdirline in instfunclines:
                        instfunclines.append(instdirline)
                    instfunclines.append('install -m %s ${WORKDIR}/%s ${D}%s' % (perms, os.path.basename(srcfile), instdestpath))
        if instfunclines:
            bbappendlines.append(('do_install_append%s()' % appendoverride, '', instfunclines))

    bb.note('Writing append file %s' % appendpath)

    if os.path.exists(appendpath):
        # Work around lack of nonlocal in python 2
        extvars = {'destsubdir': destsubdir}

        def appendfile_varfunc(varname, origvalue, op, newlines):
            if varname == 'FILESEXTRAPATHS_prepend':
                if origvalue.startswith('${THISDIR}/'):
                    popline('FILESEXTRAPATHS_prepend')
                    extvars['destsubdir'] = rd.expand(origvalue.split('${THISDIR}/', 1)[1].rstrip(':'))
            elif varname == 'PACKAGE_ARCH':
                if machine:
                    popline('PACKAGE_ARCH')
                    return (machine, None, 4, False)
            elif varname.startswith('do_install_append'):
                func = popline(varname)
                if func:
                    instfunclines = [line.strip() for line in origvalue.strip('\n').splitlines()]
                    for line in func[2]:
                        if not line in instfunclines:
                            instfunclines.append(line)
                    return (instfunclines, None, 4, False)
            else:
                splitval = split_var_value(origvalue, assignment=False)
                changed = False
                removevar = varname
                if varname in ['SRC_URI', 'SRC_URI_append%s' % appendoverride]:
                    removevar = 'SRC_URI'
                    line = popline(varname)
                    if line:
                        if line[2] not in splitval:
                            splitval.append(line[2])
                            changed = True
                else:
                    line = popline(varname)
                    if line:
                        splitval = [line[2]]
                        changed = True

                if removevar in removevalues:
                    remove = removevalues[removevar]
                    if isinstance(remove, str):
                        if remove in splitval:
                            splitval.remove(remove)
                            changed = True
                    else:
                        for removeitem in remove:
                            if removeitem in splitval:
                                splitval.remove(removeitem)
                                changed = True

                if changed:
                    newvalue = splitval
                    if len(newvalue) == 1:
                        # Ensure it's written out as one line
                        if '_append' in varname:
                            newvalue = ' ' + newvalue[0]
                        else:
                            newvalue = newvalue[0]
                    if not newvalue and (op in ['+=', '.='] or '_append' in varname):
                        # There's no point appending nothing
                        newvalue = None
                    if varname.endswith('()'):
                        indent = 4
                    else:
                        indent = -1
                    return (newvalue, None, indent, True)
            return (origvalue, None, 4, False)

        varnames = [item[0] for item in bbappendlines]
        if removevalues:
            varnames.extend(list(removevalues.keys()))

        with open(appendpath, 'r') as f:
            (updated, newlines) = bb.utils.edit_metadata(f, varnames, appendfile_varfunc)

        destsubdir = extvars['destsubdir']
    else:
        updated = False
        newlines = []

    if bbappendlines:
        for line in bbappendlines:
            if line[0].endswith('()'):
                newlines.append('%s {\n    %s\n}\n' % (line[0], '\n    '.join(line[2])))
            else:
                newlines.append('%s %s "%s"\n\n' % line)
        updated = True

    if updated:
        with open(appendpath, 'w') as f:
            f.writelines(newlines)

    if copyfiles:
        if machine:
            destsubdir = os.path.join(destsubdir, machine)
        for newfile, srcfile in copyfiles.items():
            filedest = os.path.join(appenddir, destsubdir, os.path.basename(srcfile))
            if os.path.abspath(newfile) != os.path.abspath(filedest):
                if newfile.startswith(tempfile.gettempdir()):
                    newfiledisp = os.path.basename(newfile)
                else:
                    newfiledisp = newfile
                bb.note('Copying %s to %s' % (newfiledisp, filedest))
                bb.utils.mkdirhier(os.path.dirname(filedest))
                shutil.copyfile(newfile, filedest)

    return (appendpath, os.path.join(appenddir, destsubdir))


def find_layerdir(fn):
    """ Figure out the path to the base of the layer containing a file (e.g. a recipe)"""
    pth = fn
    layerdir = ''
    while pth:
        if os.path.exists(os.path.join(pth, 'conf', 'layer.conf')):
            layerdir = pth
            break
        pth = os.path.dirname(pth)
        if pth == '/':
            return None
    return layerdir


def replace_dir_vars(path, d):
    """Replace common directory paths with appropriate variable references (e.g. /etc becomes ${sysconfdir})"""
    dirvars = {}
    # Sort by length so we get the variables we're interested in first
    for var in sorted(list(d.keys()), key=len):
        if var.endswith('dir') and var.lower() == var:
            value = d.getVar(var, True)
            if value.startswith('/') and not '\n' in value and value not in dirvars:
                dirvars[value] = var
    for dirpath in sorted(list(dirvars.keys()), reverse=True):
        path = path.replace(dirpath, '${%s}' % dirvars[dirpath])
    return path

def get_recipe_pv_without_srcpv(pv, uri_type):
    """
    Get PV without SRCPV common in SCM's for now only
    support git.

    Returns tuple with pv, prefix and suffix.
    """
    pfx = ''
    sfx = ''

    if uri_type == 'git':
        git_regex = re.compile("(?P<pfx>v?)(?P<ver>[^\+]*)((?P<sfx>\+(git)?r?(AUTOINC\+))(?P<rev>.*))?")
        m = git_regex.match(pv)

        if m:
            pv = m.group('ver')
            pfx = m.group('pfx')
            sfx = m.group('sfx')
    else:
        regex = re.compile("(?P<pfx>(v|r)?)(?P<ver>.*)")
        m = regex.match(pv)
        if m:
            pv = m.group('ver')
            pfx = m.group('pfx')

    return (pv, pfx, sfx)

def get_recipe_upstream_version(rd):
    """
        Get upstream version of recipe using bb.fetch2 methods with support for
        http, https, ftp and git.

        bb.fetch2 exceptions can be raised,
            FetchError when don't have network access or upstream site don't response.
            NoMethodError when uri latest_versionstring method isn't implemented.

        Returns a dictonary with version, type and datetime.
        Type can be A for Automatic, M for Manual and U for Unknown.
    """
    from bb.fetch2 import decodeurl
    from datetime import datetime

    ru = {}
    ru['version'] = ''
    ru['type'] = 'U'
    ru['datetime'] = ''

    pv = rd.getVar('PV', True)

    # XXX: If don't have SRC_URI means that don't have upstream sources so
    # returns the current recipe version, so that upstream version check
    # declares a match.
    src_uris = rd.getVar('SRC_URI', True)
    if not src_uris:
        ru['version'] = pv
        ru['type'] = 'M'
        ru['datetime'] = datetime.now()
        return ru

    # XXX: we suppose that the first entry points to the upstream sources
    src_uri = src_uris.split()[0]
    uri_type, _, _, _, _, _ =  decodeurl(src_uri)

    manual_upstream_version = rd.getVar("RECIPE_UPSTREAM_VERSION", True)
    if manual_upstream_version:
        # manual tracking of upstream version.
        ru['version'] = manual_upstream_version
        ru['type'] = 'M'

        manual_upstream_date = rd.getVar("CHECK_DATE", True)
        if manual_upstream_date:
            date = datetime.strptime(manual_upstream_date, "%b %d, %Y")
        else:
            date = datetime.now()
        ru['datetime'] = date

    elif uri_type == "file":
        # files are always up-to-date
        ru['version'] =  pv
        ru['type'] = 'A'
        ru['datetime'] = datetime.now()
    else:
        ud = bb.fetch2.FetchData(src_uri, rd)
        pupver = ud.method.latest_versionstring(ud, rd)
        (upversion, revision) = pupver

        # format git version version+gitAUTOINC+HASH
        if uri_type == 'git':
            (pv, pfx, sfx) = get_recipe_pv_without_srcpv(pv, uri_type)

            # if contains revision but not upversion use current pv
            if upversion == '' and revision:
                upversion = pv

            if upversion:
                tmp = upversion
                upversion = ''

                if pfx:
                    upversion = pfx + tmp
                else:
                    upversion = tmp

                if sfx:
                    upversion = upversion + sfx + revision[:10]

        if upversion:
            ru['version'] = upversion
            ru['type'] = 'A'

        ru['datetime'] = datetime.now()

    return ru