# Copyright 2014-2025 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

import os
import shlex

import portage

portage._internal_caller = True
portage._sync_mode = True
from portage.binrepo.config import BinRepoConfigLoader
from portage.const import PORTAGE_BASE_PATH, BINREPOS_CONF_FILE
from portage.output import bold, red, create_color_func
from portage._global_updates import _global_updates
from portage.sync.controller import SyncManager
from portage.util.digraph import digraph
from portage.util.futures import asyncio
from portage.util._async.AsyncScheduler import AsyncScheduler

import _emerge
from _emerge.emergelog import emergelog

warn = create_color_func("WARN")


class SyncRepos:
    short_desc = "Check repos.conf settings and/or sync repositories"

    @staticmethod
    def name():
        return "sync"

    def can_progressbar(self, func):
        return False

    def __init__(self, emerge_config=None, emerge_logging=False):
        """Class init function

        @param emerge_config: optional an emerge_config instance to use
        @param emerge_logging: boolean, defaults to False
        """
        from _emerge.main import parse_opts
        from _emerge.actions import load_emerge_config

        if emerge_config is None:
            # need a basic options instance
            actions, opts, _files = parse_opts([], silent=True)
            emerge_config = load_emerge_config(action="sync", args=_files, opts=opts)

            # Parse EMERGE_DEFAULT_OPTS, for settings like
            # --package-moves=n.
            cmdline = shlex.split(
                emerge_config.target_config.settings.get("EMERGE_DEFAULT_OPTS", "")
            )
            emerge_config.opts = parse_opts(cmdline, silent=True)[1]

            if hasattr(portage, "settings"):
                # cleanly destroy global objects
                portage._reset_legacy_globals()
                # update redundant global variables, for consistency
                # and in order to conserve memory
                portage.settings = emerge_config.target_config.settings
                portage.db = emerge_config.trees
                portage.root = portage.db._target_eroot

        self.emerge_config = emerge_config
        if emerge_logging:
            _emerge.emergelog._disable = False
        self.xterm_titles = (
            "notitles" not in self.emerge_config.target_config.settings.features
        )
        emergelog(self.xterm_titles, " === sync")

    def auto_sync(self, **kwargs):
        """Sync auto-sync enabled repos"""
        options = kwargs.get("options", None)
        if options:
            return_messages = options.get("return-messages", False)
        else:
            return_messages = False
        success, repos, msgs = self._get_repos(auto_sync_only=True)
        if not success:
            if return_messages:
                return (False, msgs)
            return (False, None)
        return self._sync(repos, return_messages, emaint_opts=options)

    def all_repos(self, **kwargs):
        """Sync all repos defined in repos.conf"""
        options = kwargs.get("options", None)
        if options:
            return_messages = options.get("return-messages", False)
        else:
            return_messages = False
        success, repos, msgs = self._get_repos(auto_sync_only=False)
        if not success:
            if return_messages:
                return (False, msgs)
            return (False, None)
        return self._sync(repos, return_messages, emaint_opts=options)

    def repo(self, **kwargs):
        """Sync the specified repo"""
        options = kwargs.get("options", None)
        if options:
            repo_names = options.get("repo", "")
            return_messages = options.get("return-messages", False)
        else:
            return_messages = False
        if isinstance(repo_names, str):
            repo_names = repo_names.split()
        success, repos, msgs = self._get_repos(
            auto_sync_only=False, match_repos=repo_names
        )
        if not success:
            if return_messages:
                return (False, msgs)
            return (False, None)
        return self._sync(repos, return_messages, emaint_opts=options)

    @staticmethod
    def _match_repos(repos, available):
        """Internal search, matches up the repo name or alias in repos.

        @param repos: list of repo names or aliases to match
        @param available: list of repo objects to search
        @return: list of repo objects that match
        """
        selected = []
        for repo in available:
            if repo.name in repos:
                selected.append(repo)
            elif repo.aliases is not None and any(
                alias in repos for alias in repo.aliases
            ):
                selected.append(repo)
        return selected

    def _get_repos(self, auto_sync_only=True, match_repos=None):
        msgs = []
        repos = self.emerge_config.target_config.settings.repositories
        if match_repos is not None:
            # Discard duplicate repository names or aliases.
            match_repos = set(match_repos)
            repos = self._match_repos(match_repos, repos)
            if len(repos) < len(match_repos):
                # Build a set of all the matched repos' names and aliases so we
                # can do a set difference for names that are missing.
                repo_names = set()
                for repo in repos:
                    repo_names.add(repo.name)
                    if repo.aliases is not None:
                        repo_names.update(repo.aliases)
                missing = match_repos - repo_names
                if missing:
                    msgs.append(
                        red(" * ")
                        + "The specified repo(s) were not found: %s"
                        % (" ".join(repo_name for repo_name in missing))
                        + "\n   ...returning"
                    )
                    return (False, repos, msgs)

        if auto_sync_only:
            repos = self._filter_auto(repos)

        sync_disabled = [repo for repo in repos if repo.sync_type is None]
        if sync_disabled:
            repos = [repo for repo in repos if repo.sync_type is not None]
            if match_repos is not None:
                msgs.append(
                    red(" * ")
                    + "The specified repo(s) have sync disabled: %s"
                    % " ".join(repo.name for repo in sync_disabled)
                    + "\n   ...returning"
                )
                return (False, repos, msgs)

        missing_sync_uri = [repo for repo in repos if repo.sync_uri is None]
        if missing_sync_uri:
            repos = [repo for repo in repos if repo.sync_uri is not None]
            msgs.append(
                red(" * ")
                + "The specified repo(s) are missing sync-uri: %s"
                % " ".join(repo.name for repo in missing_sync_uri)
                + "\n   ...returning"
            )
            return (False, repos, msgs)

        return (True, repos, msgs)

    def _filter_auto(self, repos):
        selected = []
        for repo in repos:
            if repo.auto_sync in ["yes", "true"]:
                selected.append(repo)
        return selected

    def _sync(self, selected_repos, return_messages, emaint_opts=None):
        from _emerge.post_emerge import display_news_notification

        msgs = []
        if not selected_repos:
            if return_messages:
                msgs.append("Nothing to sync... returning")
                return (True, msgs)
            return (True, None)

        if emaint_opts is not None:
            for k, v in emaint_opts.items():
                if v is not None:
                    k = "--" + k.replace("_", "-")
                    self.emerge_config.opts[k] = v

        # Portage needs to ensure a sane umask for the files it creates.
        os.umask(0o22)

        sync_manager = SyncManager(self.emerge_config.target_config.settings, emergelog)

        max_jobs = (
            self.emerge_config.opts.get("--jobs", 1)
            if "parallel-fetch" in self.emerge_config.target_config.settings.features
            else 1
        )
        sync_scheduler = SyncScheduler(
            emerge_config=self.emerge_config,
            selected_repos=selected_repos,
            sync_manager=sync_manager,
            max_jobs=max_jobs,
            event_loop=asyncio._safe_loop(),
        )

        sync_scheduler.start()
        sync_scheduler.wait()
        retvals = sync_scheduler.retvals
        msgs.extend(sync_scheduler.msgs)
        returncode = True

        if retvals:
            msgs.extend(self.rmessage(retvals, "sync"))
            for repo, retval in retvals:
                if retval != os.EX_OK:
                    returncode = False
                    break
        else:
            msgs.extend(self.rmessage([("None", os.EX_OK)], "sync"))

        # run the post_sync_hook one last time for
        # run only at sync completion hooks
        if sync_scheduler.global_hooks_enabled:
            rcode = sync_manager.perform_post_sync_hook("")
            if rcode:
                msgs.extend(self.rmessage([("None", rcode)], "post-sync"))
                if rcode != os.EX_OK:
                    returncode = False

        # Reload the whole config.
        portage._sync_mode = False
        self._reload_config()
        self._do_pkg_moves()
        msgs.extend(self._check_updates())
        display_news_notification(
            self.emerge_config.target_config, self.emerge_config.opts
        )

        if return_messages:
            return (returncode, msgs)
        return (returncode, None)

    def _do_pkg_moves(self):
        configs = [self.emerge_config.target_config]
        target_config = self.emerge_config.target_config
        running_config = self.emerge_config.running_config
        package_moves = self.emerge_config.opts.get("--package-moves") != "n"
        quiet = "--quiet" in self.emerge_config.opts
        if not package_moves:
            return

        if target_config.root != running_config.root:
            configs.append(running_config)

        for root_config in configs:
            if _global_updates(
                root_config.root,
                self.emerge_config.trees,
                root_config.mtimedb["updates"],
                quiet=quiet,
            ):
                root_config.mtimedb.commit()
                # Reload the whole config.
                self._reload_config()

    def _check_updates(self):
        """
        After syncing, notify the user if any important packages
        have updates available that should be installed first before
        anything else.

        Portage always includes itself in this list to check.
        """
        from _emerge.chk_updated_cfg_files import chk_updated_cfg_files

        target_config = self.emerge_config.target_config

        chk_updated_cfg_files(
            target_config.root,
            target_config.settings.get("CONFIG_PROTECT", "").split(),
        )

        msgs = []
        if "--quiet" in self.emerge_config.opts:
            return msgs

        early_update_packages = {
            portage.const.PORTAGE_PACKAGE_ATOM: "Portage",
        }

        # A special OpenPGP key package can be defined in either
        # repos.conf (sync-openpgp-key-package) or in
        # binrepos.conf (openpgp-key-package)
        repos = target_config.settings.repositories
        for repo in repos:
            try:
                key_package = repo.sync_openpgp_key_package
                if not key_package:
                    continue
                early_update_packages[key_package] = f"OpenPGP keys ({repo.name})"
            except AttributeError:
                continue
        #
        binrepos_config_paths = []
        if portage._not_installed:
            binrepos_config_paths.append(
                os.path.join(PORTAGE_BASE_PATH, "cnf", "binrepos.conf")
            )
        else:
            binrepos_config_paths.append(
                os.path.join(target_config.settings.global_config_path, "binrepos.conf")
            )
        binrepos_config_paths.append(
            os.path.join(
                target_config.settings["PORTAGE_CONFIGROOT"], BINREPOS_CONF_FILE
            )
        )
        binrepos_conf = BinRepoConfigLoader(
            binrepos_config_paths, target_config.settings
        )
        if binrepos_conf:
            for repo in binrepos_conf.values():
                try:
                    key_package = repo.openpgp_key_package
                    if not key_package:
                        continue
                    early_update_packages[key_package] = (
                        f"OpenPGP binhost keys ({repo.name})"
                    )
                except AttributeError:
                    continue

        porttree = target_config.trees["porttree"]
        vartree = target_config.trees["vartree"]

        for early_pkg, early_name in early_update_packages.items():
            best_pv = porttree.dbapi.xmatch("bestmatch-visible", early_pkg)
            installed_pv = portage.best(vartree.dbapi.match(early_pkg))

            try:
                old_use = vartree.dbapi.aux_get(installed_pv, ["USE"])[0].split()
            except KeyError:
                old_use = ()

            if not (best_pv and installed_pv) or best_pv == installed_pv:
                continue

            # Suggest to update to the latest available version of portage.
            # Since changes to PYTHON_TARGETS cause complications, this message
            # is suppressed if the new version has different PYTHON_TARGETS enabled
            # than previous version.
            portdb = porttree.dbapi
            portdb.doebuild_settings.setcpv(best_pv, mydb=portdb)
            usemask = portdb.doebuild_settings.usemask
            useforce = portdb.doebuild_settings.useforce
            new_use = (
                frozenset(portdb.doebuild_settings["PORTAGE_USE"].split()) | useforce
            ) - usemask
            new_python_targets = frozenset(
                x for x in new_use if x.startswith("python_targets_")
            )
            old_python_targets = frozenset(
                x for x in old_use if x.startswith("python_targets_")
            )

            if new_python_targets == old_python_targets:
                msgs.append("")
                msgs.append(
                    warn(" * ")
                    + bold(f"An update to {early_name} is available.")
                    + " It is _highly_ recommended"
                )
                msgs.append(
                    warn(" * ")
                    + f"that you update {early_name} now, before any other packages are updated."
                )
                msgs.append("")
                msgs.append(
                    warn(" * ")
                    + f"To update {early_name}, run 'emerge --oneshot {early_pkg}' now."
                )
                msgs.append("")

        return msgs

    def _reload_config(self):
        """Reload the whole config from scratch."""
        from _emerge.actions import load_emerge_config, adjust_configs

        load_emerge_config(emerge_config=self.emerge_config)
        adjust_configs(self.emerge_config.opts, self.emerge_config.trees)

    def rmessage(self, rvals, action):
        """Creates emaint style messages to return to the task handler"""
        messages = []
        for rval in rvals:
            messages.append(
                f"Action: {action} for repo: {rval[0]}, returned code = {rval[1]}"
            )
        return messages


class SyncScheduler(AsyncScheduler):
    """
    Sync repos in parallel, but don't sync a given repo until all
    of its masters have synced.
    """

    def __init__(self, **kwargs):
        """
        @param emerge_config: an emerge_config instance
        @param selected_repos: list of RepoConfig instances
        @param sync_manager: a SyncManger instance
        """
        self._emerge_config = kwargs.pop("emerge_config")
        self._selected_repos = kwargs.pop("selected_repos")
        self._sync_manager = kwargs.pop("sync_manager")
        AsyncScheduler.__init__(self, **kwargs)
        self._init_graph()
        self.retvals = []
        self.msgs = []

    def _init_graph(self):
        """
        Graph relationships between repos and their masters.
        """
        self._sync_graph = digraph()
        self._leaf_nodes = []
        self._repo_map = {}
        self._running_repos = set()
        selected_repo_names = frozenset(repo.name for repo in self._selected_repos)
        for repo in self._selected_repos:
            self._repo_map[repo.name] = repo
            self._sync_graph.add(repo.name, None)
            for master in repo.masters:
                if master.name in selected_repo_names:
                    self._repo_map[master.name] = master
                    self._sync_graph.add(master.name, repo.name)
        self._complete_graph = self._sync_graph.copy()
        self._hooks_repos = set()
        self._update_leaf_nodes()

    def _task_exit(self, task):
        """
        Remove the task from the graph, in order to expose
        more leaf nodes.
        """
        self._running_tasks.discard(task)
        # Set hooks_enabled = True by default, in order to ensure
        # that hooks will be called in a backward-compatible manner
        # even if all sync tasks have failed.
        hooks_enabled = True
        returncode = task.returncode
        if task.returncode == os.EX_OK:
            returncode, message, updatecache_flg, hooks_enabled = task.result
            if message:
                self.msgs.append(message)
        repo = task.kwargs["repo"].name
        self._running_repos.remove(repo)
        self.retvals.append((repo, returncode))
        self._sync_graph.remove(repo)
        self._update_leaf_nodes()
        if hooks_enabled:
            self._hooks_repos.add(repo)
        super()._task_exit(self)

    def _master_hooks(self, repo_name):
        """
        @param repo_name: a repo name
        @type repo_name: str
        @return: True if hooks would have been executed for any master
                repositories of the given repo, False otherwise
        @rtype: bool
        """
        traversed_nodes = set()
        node_stack = [repo_name]
        while node_stack:
            node = node_stack.pop()
            if node in self._hooks_repos:
                return True
            if node not in traversed_nodes:
                traversed_nodes.add(node)
                node_stack.extend(self._complete_graph.child_nodes(node))
        return False

    @property
    def global_hooks_enabled(self):
        """
        @return: True if repo.postsync.d hooks would have been executed
                for any repositories.
        @rtype: bool
        """
        return bool(self._hooks_repos)

    def _update_leaf_nodes(self):
        """
        Populate self._leaf_nodes with current leaves from
        self._sync_graph. If a circular master relationship
        is discovered, choose a random node to break the cycle.
        """
        if self._sync_graph and not self._leaf_nodes:
            self._leaf_nodes = [
                obj
                for obj in self._sync_graph.leaf_nodes()
                if obj not in self._running_repos
            ]

            if not (self._leaf_nodes or self._running_repos):
                # If there is a circular master relationship,
                # choose a random node to break the cycle.
                self._leaf_nodes = [next(iter(self._sync_graph))]

    def _next_task(self):
        """
        Return a task for the next available leaf node.
        """
        if not self._sync_graph:
            raise StopIteration()
        # If self._sync_graph is non-empty, then self._leaf_nodes
        # is guaranteed to be non-empty, since otherwise
        # _can_add_job would have returned False and prevented
        # _next_task from being immediately called.
        node = self._leaf_nodes.pop()
        self._running_repos.add(node)
        self._update_leaf_nodes()

        return self._sync_manager.sync_async(
            emerge_config=self._emerge_config,
            repo=self._repo_map[node],
            master_hooks=self._master_hooks(node),
        )

    def _can_add_job(self):
        """
        Returns False if there are no leaf nodes available.
        """
        if not AsyncScheduler._can_add_job(self):
            return False
        return bool(self._leaf_nodes) and not self._terminated.is_set()

    def _keep_scheduling(self):
        """
        Schedule as long as the graph is non-empty, and we haven't
        been terminated.
        """
        return bool(self._sync_graph) and not self._terminated.is_set()
