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#!/usr/bin/env python

# Fetch layer repositories and update layer index database
#
# Copyright (C) 2013 Intel Corporation
# Author: Paul Eggleton <paul.eggleton@linux.intel.com>
#
# Licensed under the MIT license, see COPYING.MIT for details


import sys
import os.path
import optparse
import logging
from datetime import datetime
import re
import tempfile
import shutil
from distutils.version import LooseVersion
import utils
import recipeparse

import warnings
warnings.filterwarnings("ignore", category=DeprecationWarning)

logger = utils.logger_create('LayerIndexUpdate')

# Ensure PythonGit is installed (buildhistory_analysis needs it)
try:
    import git
except ImportError:
    logger.error("Please install PythonGit 0.3.1 or later in order to use this script")
    sys.exit(1)


def check_machine_conf(path, subdir_start):
    subpath = path[len(subdir_start):]
    res = conf_re.match(subpath)
    if res:
        return res.group(1)
    return None

def split_recipe_fn(path):
    splitfn = os.path.basename(path).split('.bb')[0].split('_', 2)
    pn = splitfn[0]
    if len(splitfn) > 1:
        pv = splitfn[1]
    else:
        pv = "1.0"
    return (pn, pv)

def update_recipe_file(data, path, recipe, layerdir_start, repodir):
    fn = str(os.path.join(path, recipe.filename))
    try:
        logger.debug('Updating recipe %s' % fn)
        envdata = bb.cache.Cache.loadDataFull(fn, [], data)
        envdata.setVar('SRCPV', 'X')
        recipe.pn = envdata.getVar("PN", True)
        recipe.pv = envdata.getVar("PV", True)
        recipe.summary = envdata.getVar("SUMMARY", True)
        recipe.description = envdata.getVar("DESCRIPTION", True)
        recipe.section = envdata.getVar("SECTION", True)
        recipe.license = envdata.getVar("LICENSE", True)
        recipe.homepage = envdata.getVar("HOMEPAGE", True)
        recipe.bugtracker = envdata.getVar("BUGTRACKER", True) or ""
        recipe.provides = envdata.getVar("PROVIDES", True) or ""
        recipe.bbclassextend = envdata.getVar("BBCLASSEXTEND", True) or ""
        recipe.save()

        # Get file dependencies within this layer
        deps = envdata.getVar('__depends', True)
        filedeps = []
        for depstr, date in deps:
            found = False
            if depstr.startswith(layerdir_start) and not depstr.endswith('/conf/layer.conf'):
                filedeps.append(os.path.relpath(depstr, repodir))
        from layerindex.models import RecipeFileDependency
        RecipeFileDependency.objects.filter(recipe=recipe).delete()
        for filedep in filedeps:
            recipedep = RecipeFileDependency()
            recipedep.layerbranch = recipe.layerbranch
            recipedep.recipe = recipe
            recipedep.path = filedep
            recipedep.save()
    except KeyboardInterrupt:
        raise
    except BaseException as e:
        if not recipe.pn:
            recipe.pn = recipe.filename[:-3].split('_')[0]
        logger.error("Unable to read %s: %s", fn, str(e))

def update_machine_conf_file(path, machine):
    logger.debug('Updating machine %s' % path)
    desc = ""
    with open(path, 'r') as f:
        for line in f:
            if line.startswith('#@NAME:'):
                desc = line[7:].strip()
            if line.startswith('#@DESCRIPTION:'):
                desc = line[14:].strip()
                desc = re.sub(r'Machine configuration for( running)*( an)*( the)*', '', desc)
                break
    machine.description = desc

def main():
    if LooseVersion(git.__version__) < '0.3.1':
        logger.error("Version of GitPython is too old, please install GitPython (python-git) 0.3.1 or later in order to use this script")
        sys.exit(1)


    parser = optparse.OptionParser(
        usage = """
    %prog [options]""")

    parser.add_option("-b", "--branch",
            help = "Specify branch to update",
            action="store", dest="branch", default='master')
    parser.add_option("-l", "--layer",
            help = "Specify layers to update (use commas to separate multiple). Default is all published layers.",
            action="store", dest="layers")
    parser.add_option("-r", "--reload",
            help = "Reload recipe data instead of updating since last update",
            action="store_true", dest="reload")
    parser.add_option("", "--fullreload",
            help = "Discard existing recipe data and fetch it from scratch",
            action="store_true", dest="fullreload")
    parser.add_option("-n", "--dry-run",
            help = "Don't write any data back to the database",
            action="store_true", dest="dryrun")
    parser.add_option("-x", "--nofetch",
            help = "Don't fetch repositories",
            action="store_true", dest="nofetch")
    parser.add_option("", "--nocheckout",
            help = "Don't check out branches",
            action="store_true", dest="nocheckout")
    parser.add_option("-d", "--debug",
            help = "Enable debug output",
            action="store_const", const=logging.DEBUG, dest="loglevel", default=logging.INFO)
    parser.add_option("-q", "--quiet",
            help = "Hide all output except error messages",
            action="store_const", const=logging.ERROR, dest="loglevel")

    options, args = parser.parse_args(sys.argv)
    if len(args) > 1:
        logger.error('unexpected argument "%s"' % args[1])
        parser.print_help()
        sys.exit(1)

    if options.fullreload:
        options.reload = True

    utils.setup_django()
    import settings
    from layerindex.models import LayerItem, LayerBranch, Recipe, RecipeFileDependency, Machine, BBAppend, BBClass
    from django.db import transaction

    logger.setLevel(options.loglevel)

    branch = utils.get_branch(options.branch)
    if not branch:
        logger.error("Specified branch %s is not valid" % options.branch)
        sys.exit(1)

    fetchdir = settings.LAYER_FETCH_DIR
    if not fetchdir:
        logger.error("Please set LAYER_FETCH_DIR in settings.py")
        sys.exit(1)

    if options.layers:
        layerquery = LayerItem.objects.filter(classic=False).filter(name__in=options.layers.split(','))
        if layerquery.count() == 0:
            logger.error('No layers matching specified query "%s"' % options.layers)
            sys.exit(1)
    else:
        layerquery = LayerItem.objects.filter(classic=False).filter(status='P')
        if layerquery.count() == 0:
            logger.info("No published layers to update")
            sys.exit(1)

    if not os.path.exists(fetchdir):
        os.makedirs(fetchdir)
    fetchedrepos = []
    failedrepos = []

    lockfn = os.path.join(fetchdir, "layerindex.lock")
    lockfile = utils.lock_file(lockfn)
    if not lockfile:
        logger.error("Layer index lock timeout expired")
        sys.exit(1)
    try:
        bitbakepath = os.path.join(fetchdir, 'bitbake')

        if not options.nofetch:
            # Fetch latest metadata from repositories
            for layer in layerquery:
                # Handle multiple layers in a single repo
                urldir = layer.get_fetch_dir()
                repodir = os.path.join(fetchdir, urldir)
                if not (layer.vcs_url in fetchedrepos or layer.vcs_url in failedrepos):
                    logger.info("Fetching remote repository %s" % layer.vcs_url)
                    out = None
                    try:
                        if not os.path.exists(repodir):
                            out = utils.runcmd("git clone %s %s" % (layer.vcs_url, urldir), fetchdir, logger=logger)
                        else:
                            out = utils.runcmd("git fetch", repodir, logger=logger)
                    except Exception as e:
                        logger.error("Fetch of layer %s failed: %s" % (layer.name, str(e)))
                        failedrepos.append(layer.vcs_url)
                        continue
                    fetchedrepos.append(layer.vcs_url)

            if not fetchedrepos:
                logger.error("No repositories could be fetched, exiting")
                sys.exit(1)

            logger.info("Fetching bitbake from remote repository %s" % settings.BITBAKE_REPO_URL)
            if not os.path.exists(bitbakepath):
                out = utils.runcmd("git clone %s %s" % (settings.BITBAKE_REPO_URL, 'bitbake'), fetchdir, logger=logger)
            else:
                out = utils.runcmd("git fetch", bitbakepath, logger=logger)

        try:
            (tinfoil, tempdir) = recipeparse.init_parser(settings, branch, bitbakepath, nocheckout=options.nocheckout, logger=logger)
        except recipeparse.RecipeParseError as e:
            logger.error(str(e))
            sys.exit(1)

        # Clear the default value of SUMMARY so that we can use DESCRIPTION instead if it hasn't been set
        tinfoil.config_data.setVar('SUMMARY', '')
        # Clear the default value of DESCRIPTION so that we can see where it's not set
        tinfoil.config_data.setVar('DESCRIPTION', '')
        # Clear the default value of HOMEPAGE ('unknown')
        tinfoil.config_data.setVar('HOMEPAGE', '')
        # Set a blank value for LICENSE so that it doesn't cause the parser to die (e.g. with meta-ti -
        # why won't they just fix that?!)
        tinfoil.config_data.setVar('LICENSE', '')

        # Process and extract data from each layer
        for layer in layerquery:
            transaction.enter_transaction_management()
            transaction.managed(True)
            try:
                urldir = layer.get_fetch_dir()
                repodir = os.path.join(fetchdir, urldir)
                if layer.vcs_url in failedrepos:
                    logger.info("Skipping update of layer %s as fetch of repository %s failed" % (layer.name, layer.vcs_url))
                    transaction.rollback()
                    continue

                layerbranch = layer.get_layerbranch(options.branch)

                branchname = options.branch
                branchdesc = options.branch
                if layerbranch:
                    if layerbranch.actual_branch:
                        branchname = layerbranch.actual_branch
                        branchdesc = "%s (%s)" % (options.branch, branchname)

                # Collect repo info
                repo = git.Repo(repodir)
                assert repo.bare == False
                try:
                    if options.nocheckout:
                        topcommit = repo.commit('HEAD')
                    else:
                        topcommit = repo.commit('origin/%s' % branchname)
                except:
                    if layerbranch:
                        logger.error("Failed update of layer %s - branch %s no longer exists" % (layer.name, branchdesc))
                    else:
                        logger.info("Skipping update of layer %s - branch %s doesn't exist" % (layer.name, branchdesc))
                    transaction.rollback()
                    continue

                if not layerbranch:
                    # LayerBranch doesn't exist for this branch, create it
                    layerbranch = LayerBranch()
                    layerbranch.layer = layer
                    layerbranch.branch = branch
                    layerbranch_master = layer.get_layerbranch('master')
                    if layerbranch_master:
                        layerbranch.vcs_subdir = layerbranch_master.vcs_subdir
                    layerbranch.save()
                    if layerbranch_master:
                        for maintainer in layerbranch_master.layermaintainer_set.all():
                            maintainer.pk = None
                            maintainer.id = None
                            maintainer.layerbranch = layerbranch
                            maintainer.save()
                        for dep in layerbranch_master.dependencies_set.all():
                            dep.pk = None
                            dep.id = None
                            dep.layerbranch = layerbranch
                            dep.save()

                if layerbranch.vcs_subdir and not options.nocheckout:
                    # Find latest commit in subdirectory
                    # A bit odd to do it this way but apparently there's no other way in the GitPython API
                    for commit in repo.iter_commits('origin/%s' % options.branch, paths=layerbranch.vcs_subdir):
                        topcommit = commit
                        break

                layerdir = os.path.join(repodir, layerbranch.vcs_subdir)
                layerdir_start = os.path.normpath(layerdir) + os.sep
                layerrecipes = Recipe.objects.filter(layerbranch=layerbranch)
                layermachines = Machine.objects.filter(layerbranch=layerbranch)
                layerappends = BBAppend.objects.filter(layerbranch=layerbranch)
                layerclasses = BBClass.objects.filter(layerbranch=layerbranch)
                if layerbranch.vcs_last_rev != topcommit.hexsha or options.reload:
                    # Check out appropriate branch
                    if not options.nocheckout:
                        out = utils.runcmd("git checkout origin/%s" % branchname, repodir, logger=logger)
                        out = utils.runcmd("git clean -f -x", repodir, logger=logger)

                    if not os.path.exists(layerdir):
                        if options.branch == 'master':
                            logger.error("Subdirectory for layer %s does not exist on branch %s!" % branchdesc)
                            transaction.rollback()
                            continue
                        else:
                            logger.info("Skipping update of layer %s for branch %s - subdirectory does not exist on this branch" % (layer.name, branchdesc))
                            transaction.rollback()
                            continue

                    if not os.path.exists(os.path.join(layerdir, 'conf/layer.conf')):
                        logger.error("conf/layer.conf not found for layer %s - is subdirectory set correctly?" % layer.name)
                        transaction.rollback()
                        continue

                    logger.info("Collecting data for layer %s on branch %s" % (layer.name, branchdesc))

                    try:
                        config_data_copy = recipeparse.setup_layer(tinfoil.config_data, fetchdir, layerdir, layer, layerbranch)
                    except recipeparse.RecipeParseError as e:
                        logger.error(str(e))
                        transaction.rollback()
                        continue

                    if layerbranch.vcs_last_rev and not options.reload:
                        try:
                            diff = repo.commit(layerbranch.vcs_last_rev).diff(topcommit)
                        except Exception as e:
                            logger.warn("Unable to get diff from last commit hash for layer %s - falling back to slow update: %s" % (layer.name, str(e)))
                            diff = None
                    else:
                        diff = None

                    # We handle recipes specially to try to preserve the same id
                    # when recipe upgrades happen (so that if a user bookmarks a
                    # recipe page it remains valid)
                    layerrecipes_delete = []
                    layerrecipes_add = []

                    if diff:
                        # Apply git changes to existing recipe list

                        if layerbranch.vcs_subdir:
                            subdir_start = os.path.normpath(layerbranch.vcs_subdir) + os.sep
                        else:
                            subdir_start = ""

                        updatedrecipes = set()
                        for d in diff.iter_change_type('D'):
                            path = d.a_blob.path
                            if path.startswith(subdir_start):
                                (typename, filepath, filename) = recipeparse.detect_file_type(path, subdir_start)
                                if typename == 'recipe':
                                    values = layerrecipes.filter(filepath=filepath).filter(filename=filename).values('id', 'filepath', 'filename', 'pn')
                                    if len(values):
                                        layerrecipes_delete.append(values[0])
                                        logger.debug("Mark %s for deletion" % values[0])
                                        updatedrecipes.add(os.path.join(values[0]['filepath'], values[0]['filename']))
                                    else:
                                        logger.warn("Deleted recipe %s could not be found" % path)
                                elif typename == 'bbappend':
                                    layerappends.filter(filepath=filepath).filter(filename=filename).delete()
                                elif typename == 'machine':
                                    layermachines.filter(name=filename).delete()
                                elif typename == 'bbclass':
                                    layerclasses.filter(name=filename).delete()

                        for d in diff.iter_change_type('A'):
                            path = d.b_blob.path
                            if path.startswith(subdir_start):
                                (typename, filepath, filename) = recipeparse.detect_file_type(path, subdir_start)
                                if typename == 'recipe':
                                    layerrecipes_add.append(os.path.join(repodir, path))
                                    logger.debug("Mark %s for addition" % path)
                                    updatedrecipes.add(os.path.join(filepath, filename))
                                elif typename == 'bbappend':
                                    append = BBAppend()
                                    append.layerbranch = layerbranch
                                    append.filename = filename
                                    append.filepath = filepath
                                    append.save()
                                elif typename == 'machine':
                                    machine = Machine()
                                    machine.layerbranch = layerbranch
                                    machine.name = filename
                                    update_machine_conf_file(os.path.join(repodir, path), machine)
                                    machine.save()
                                elif typename == 'bbclass':
                                    bbclass = BBClass()
                                    bbclass.layerbranch = layerbranch
                                    bbclass.name = filename
                                    bbclass.save()

                        dirtyrecipes = set()
                        for d in diff.iter_change_type('M'):
                            path = d.a_blob.path
                            if path.startswith(subdir_start):
                                (typename, filepath, filename) = recipeparse.detect_file_type(path, subdir_start)
                                if typename == 'recipe':
                                    logger.debug("Mark %s for update" % path)
                                    results = layerrecipes.filter(filepath=filepath).filter(filename=filename)[:1]
                                    if results:
                                        recipe = results[0]
                                        update_recipe_file(config_data_copy, os.path.join(layerdir, filepath), recipe, layerdir_start, repodir)
                                        recipe.save()
                                        updatedrecipes.add(recipe.full_path())
                                elif typename == 'machine':
                                    results = layermachines.filter(name=filename)
                                    if results:
                                        machine = results[0]
                                        update_machine_conf_file(os.path.join(repodir, path), machine)
                                        machine.save()

                                deps = RecipeFileDependency.objects.filter(layerbranch=layerbranch).filter(path=path)
                                for dep in deps:
                                    dirtyrecipes.add(dep.recipe)

                        for recipe in dirtyrecipes:
                            if not recipe.full_path() in updatedrecipes:
                                update_recipe_file(config_data_copy, os.path.join(layerdir, recipe.filepath), recipe, layerdir_start, repodir)
                    else:
                        # Collect recipe data from scratch

                        if options.fullreload:
                            layerrecipes.delete()
                        else:
                            # First, check which recipes still exist
                            layerrecipe_values = layerrecipes.values('id', 'filepath', 'filename', 'pn')
                            layerrecipe_fns = []
                            for v in layerrecipe_values:
                                root = os.path.join(layerdir, v['filepath'])
                                fullpath = os.path.join(root, v['filename'])
                                if os.path.exists(fullpath):
                                    # Recipe still exists, update it
                                    results = layerrecipes.filter(id=v['id'])[:1]
                                    recipe = results[0]
                                    update_recipe_file(config_data_copy, root, recipe, layerdir_start, repodir)
                                else:
                                    # Recipe no longer exists, mark it for later on
                                    layerrecipes_delete.append(v)
                                layerrecipe_fns.append(fullpath)

                        layermachines.delete()
                        layerappends.delete()
                        layerclasses.delete()
                        for root, dirs, files in os.walk(layerdir):
                            if '.git' in dirs:
                                dirs.remove('.git')
                            for f in files:
                                fullpath = os.path.join(root, f)
                                (typename, _, filename) = recipeparse.detect_file_type(fullpath, layerdir_start)
                                if typename == 'recipe':
                                    if fullpath not in layerrecipe_fns:
                                        layerrecipes_add.append(fullpath)
                                elif typename == 'bbappend':
                                    append = BBAppend()
                                    append.layerbranch = layerbranch
                                    append.filename = f
                                    append.filepath = os.path.relpath(root, layerdir)
                                    append.save()
                                elif typename == 'machine':
                                    machine = Machine()
                                    machine.layerbranch = layerbranch
                                    machine.name = filename
                                    update_machine_conf_file(fullpath, machine)
                                    machine.save()
                                elif typename == 'bbclass':
                                    bbclass = BBClass()
                                    bbclass.layerbranch = layerbranch
                                    bbclass.name = filename
                                    bbclass.save()

                    for added in layerrecipes_add:
                        # This is good enough without actually parsing the file
                        (pn, pv) = split_recipe_fn(added)
                        oldid = -1
                        for deleted in layerrecipes_delete:
                            if deleted['pn'] == pn:
                                oldid = deleted['id']
                                layerrecipes_delete.remove(deleted)
                                break
                        if oldid > -1:
                            # Reclaim a record we would have deleted
                            results = Recipe.objects.filter(id=oldid)[:1]
                            recipe = results[0]
                            logger.debug("Reclaim %s for %s %s" % (recipe, pn, pv))
                        else:
                            # Create new record
                            logger.debug("Add new recipe %s" % added)
                            recipe = Recipe()
                        recipe.layerbranch = layerbranch
                        recipe.filename = os.path.basename(added)
                        root = os.path.dirname(added)
                        recipe.filepath = os.path.relpath(root, layerdir)
                        update_recipe_file(config_data_copy, root, recipe, layerdir_start, repodir)
                        recipe.save()

                    for deleted in layerrecipes_delete:
                        logger.debug("Delete %s" % deleted)
                        results = Recipe.objects.filter(id=deleted['id'])[:1]
                        recipe = results[0]
                        recipe.delete()

                    # Save repo info
                    layerbranch.vcs_last_rev = topcommit.hexsha
                    layerbranch.vcs_last_commit = datetime.fromtimestamp(topcommit.committed_date)
                else:
                    logger.info("Layer %s is already up-to-date for branch %s" % (layer.name, branchdesc))

                layerbranch.vcs_last_fetch = datetime.now()
                layerbranch.save()

                if options.dryrun:
                    transaction.rollback()
                else:
                    transaction.commit()
            except KeyboardInterrupt:
                transaction.rollback()
                logger.warn("Update interrupted, changes to %s rolled back" % layer.name)
                break
            except:
                import traceback
                traceback.print_exc()
                transaction.rollback()
            finally:
                transaction.leave_transaction_management()

    finally:
        utils.unlock_file(lockfile)

    shutil.rmtree(tempdir)
    sys.exit(0)


if __name__ == "__main__":
    main()