#! /usr/bin/python3
# -*- coding: utf-8 -*-
#
# Copyright (C) 2007-2010, Siegfried-A. Gevatter <rainct@ubuntu.com>,
#               2010-2011, Stefano Rivera <stefanor@ubuntu.com>
# With some changes by Iain Lane <iain@orangesquash.org.uk>
# Based upon pbuilder-dist-simple by Jamin Collins and Jordan Mantha.
#
# ##################################################################
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# 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.
#
# See file /usr/share/common-licenses/GPL-2 for more details.
#
# ##################################################################
#
# This script is a wrapper to be able to easily use pbuilder/cowbuilder for
# different distributions (eg, Gutsy, Hardy, Debian unstable, etc).
#
# You can create symlinks to a pbuilder-dist executable to get different
# configurations. For example, a symlink called pbuilder-hardy will assume
# that the target distribution is always meant to be Ubuntu Hardy.

# pylint: disable=invalid-name
# pylint: enable=invalid-name

import os
import os.path
import shutil
import subprocess
import sys
from contextlib import suppress

import debian.deb822
from distro_info import DebianDistroInfo, DistroDataOutdated, UbuntuDistroInfo

import ubuntutools.misc
import ubuntutools.version
from ubuntutools import getLogger
from ubuntutools.config import UDTConfig
from ubuntutools.question import YesNoQuestion

Logger = getLogger()


class PbuilderDist:
    def __init__(self, builder):
        # Base directory where pbuilder will put all the files it creates.
        self.base = None

        # Name of the operation which pbuilder should perform.
        self.operation = None

        # Wheter additional components should be used or not. That is,
        # 'universe' and 'multiverse' for Ubuntu chroots and 'contrib'
        # and 'non-free' for Debian.
        self.extra_components = True

        # Extra pockets, useful on stable releases
        self.enable_security = True
        self.enable_updates = True
        self.enable_proposed = True
        self.enable_backports = False

        # File where the log of the last operation will be saved.
        self.logfile = None

        # System architecture
        self.system_architecture = None

        # Build architecture
        self.build_architecture = None

        # System's distribution
        self.system_distro = None

        # Target distribution
        self.target_distro = None

        # This is an identificative string which will either take the form
        # 'distribution' or 'distribution-architecture'.
        self.chroot_string = None

        # Authentication method
        self.auth = "sudo"

        # Builder
        self.builder = builder

        # Distro info
        self.debian_distro_info = DebianDistroInfo()
        self.ubuntu_distro_info = UbuntuDistroInfo()

        self._debian_distros = self.debian_distro_info.all + ["stable", "testing", "unstable"]

        # Ensure that the used builder is installed
        paths = set(os.environ["PATH"].split(":"))
        paths |= set(("/sbin", "/usr/sbin", "/usr/local/sbin"))
        if not any(os.path.exists(os.path.join(p, builder)) for p in paths):
            Logger.error('Could not find "%s".', builder)
            sys.exit(1)

        ##############################################################

        self.base = os.path.expanduser(os.environ.get("PBUILDFOLDER", "~/pbuilder/"))

        if "SUDO_USER" in os.environ:
            Logger.warning(
                "Running under sudo. "
                "This is probably not what you want. "
                "pbuilder-dist will use sudo itself, "
                "when necessary."
            )
        if os.stat(os.environ["HOME"]).st_uid != os.getuid():
            Logger.error("You don't own $HOME")
            sys.exit(1)

        if not os.path.isdir(self.base):
            try:
                os.makedirs(self.base)
            except OSError:
                Logger.error('Cannot create base directory "%s"', self.base)
                sys.exit(1)

        if "PBUILDAUTH" in os.environ:
            self.auth = os.environ["PBUILDAUTH"]

        self.system_architecture = ubuntutools.misc.host_architecture()
        self.system_distro = ubuntutools.misc.system_distribution()
        if not self.system_architecture or not self.system_distro:
            sys.exit(1)

        self.target_distro = self.system_distro

    def set_target_distro(self, distro):
        """PbuilderDist.set_target_distro(distro) -> None

        Check if the given target distribution name is correct, if it
        isn't know to the system ask the user for confirmation before
        proceeding, and finally either save the value into the appropiate
        variable or finalize pbuilder-dist's execution.
        """
        if not distro.isalpha():
            Logger.error('"%s" is an invalid distribution codename.', distro)
            sys.exit(1)

        if not os.path.isfile(os.path.join("/usr/share/debootstrap/scripts/", distro)):
            if os.path.isdir("/usr/share/debootstrap/scripts/"):
                # Debian experimental doesn't have a debootstrap file but
                # should work nevertheless. Ubuntu releases automatically use
                # the gutsy script as of debootstrap 1.0.128+nmu2ubuntu1.1.
                if distro not in (self._debian_distros + self.ubuntu_distro_info.all):
                    question = (
                        f'Warning: Unknown distribution "{distro}". ' "Do you want to continue"
                    )
                    answer = YesNoQuestion().ask(question, "no")
                    if answer == "no":
                        sys.exit(0)
            else:
                Logger.error('Please install package "debootstrap".')
                sys.exit(1)

        self.target_distro = distro

    def set_operation(self, operation):
        """PbuilderDist.set_operation -> None

        Check if the given string is a valid pbuilder operation and
        depending on this either save it into the appropiate variable
        or finalize pbuilder-dist's execution.
        """
        arguments = ("create", "update", "build", "clean", "login", "execute")

        if operation not in arguments:
            if operation.endswith(".dsc"):
                if os.path.isfile(operation):
                    self.operation = "build"
                    return [operation]
                Logger.error('Could not find file "%s".', operation)
                sys.exit(1)

            Logger.error(
                '"%s" is not a recognized argument.\nPlease use one of these: %s.',
                operation,
                ", ".join(arguments),
            )
            sys.exit(1)

        self.operation = operation
        return []

    def get_command(self, remaining_arguments=None):
        """PbuilderDist.get_command -> string

        Generate the pbuilder command which matches the given configuration
        and return it as a string.
        """
        if not self.build_architecture:
            self.build_architecture = self.system_architecture

        if self.build_architecture == self.system_architecture:
            self.chroot_string = self.target_distro
        else:
            self.chroot_string = self.target_distro + "-" + self.build_architecture

        prefix = os.path.join(self.base, self.chroot_string)
        if "--buildresult" not in remaining_arguments:
            result = os.path.normpath(f"{prefix}_result/")
        else:
            location_of_arg = remaining_arguments.index("--buildresult")
            result = os.path.normpath(remaining_arguments[location_of_arg + 1])
            remaining_arguments.pop(location_of_arg + 1)
            remaining_arguments.pop(location_of_arg)

        if not self.logfile and self.operation != "login":
            if self.operation == "build":
                dsc_files = [a for a in remaining_arguments if a.strip().endswith(".dsc")]
                assert len(dsc_files) == 1
                dsc = debian.deb822.Dsc(open(dsc_files[0], encoding="utf-8"))
                version = ubuntutools.version.Version(dsc["Version"])
                name = (
                    dsc["Source"]
                    + "_"
                    + version.strip_epoch()
                    + "_"
                    + self.build_architecture
                    + ".build"
                )
                self.logfile = os.path.join(result, name)
            else:
                self.logfile = os.path.join(result, "last_operation.log")

        if not os.path.isdir(result):
            try:
                os.makedirs(result)
            except OSError:
                Logger.error('Cannot create results directory "%s"', result)
                sys.exit(1)

        arguments = [
            f"--{self.operation}",
            "--distribution",
            self.target_distro,
            "--buildresult",
            result,
        ]

        if self.operation == "update":
            arguments += ["--override-config"]

        if self.builder == "pbuilder":
            arguments += ["--basetgz", prefix + "-base.tgz"]
        elif self.builder == "cowbuilder":
            arguments += ["--basepath", prefix + "-base.cow"]
        else:
            Logger.error('Unrecognized builder "%s".', self.builder)
            sys.exit(1)

        if self.logfile:
            arguments += ["--logfile", self.logfile]

        if os.path.exists("/var/cache/archive/"):
            arguments += ["--bindmounts", "/var/cache/archive/"]

        config = UDTConfig()
        if self.target_distro in self._debian_distros:
            mirror = os.environ.get("MIRRORSITE", config.get_value("DEBIAN_MIRROR"))
            components = "main"
            if self.extra_components:
                components += " contrib non-free non-free-firmware"
        else:
            mirror = os.environ.get("MIRRORSITE", config.get_value("UBUNTU_MIRROR"))
            if self.build_architecture not in ("amd64", "i386"):
                mirror = os.environ.get("MIRRORSITE", config.get_value("UBUNTU_PORTS_MIRROR"))
            components = "main restricted"
            if self.extra_components:
                components += " universe multiverse"

        arguments += ["--mirror", mirror]

        othermirrors = []
        localrepo = f"/var/cache/archive/{self.target_distro}"
        if os.path.exists(localrepo):
            repo = f"deb file:///var/cache/archive/ {self.target_distro}/"
            othermirrors.append(repo)

        if self.target_distro in self._debian_distros:
            try:
                codename = self.debian_distro_info.codename(
                    self.target_distro, default=self.target_distro
                )
            except DistroDataOutdated as error:
                Logger.warning(error)
            if codename in (self.debian_distro_info.devel(), "experimental"):
                self.enable_security = False
                self.enable_updates = False
                self.enable_proposed = False
            elif codename in (self.debian_distro_info.testing(), "testing"):
                self.enable_updates = False

            if self.enable_security:
                pocket = "-security"
                with suppress(ValueError):
                    # before bullseye (version 11) security suite is /updates
                    if float(self.debian_distro_info.version(codename)) < 11.0:
                        pocket = "/updates"
                othermirrors.append(
                    f"deb {config.get_value('DEBSEC_MIRROR')}"
                    f" {self.target_distro}{pocket} {components}"
                )
            if self.enable_updates:
                othermirrors.append(f"deb {mirror} {self.target_distro}-updates {components}")
            if self.enable_proposed:
                othermirrors.append(
                    f"deb {mirror} {self.target_distro}-proposed-updates {components}"
                )
            if self.enable_backports:
                othermirrors.append(f"deb {mirror} {self.target_distro}-backports {components}")

            aptcache = os.path.join(self.base, "aptcache", "debian")
        else:
            try:
                dev_release = self.target_distro == self.ubuntu_distro_info.devel()
            except DistroDataOutdated as error:
                Logger.warning(error)
                dev_release = True

            if dev_release:
                self.enable_security = False
                self.enable_updates = False

            if self.enable_security:
                othermirrors.append(f"deb {mirror} {self.target_distro}-security {components}")
            if self.enable_updates:
                othermirrors.append(f"deb {mirror} {self.target_distro}-updates {components}")
            if self.enable_proposed:
                othermirrors.append(f"deb {mirror} {self.target_distro}-proposed {components}")

            aptcache = os.path.join(self.base, "aptcache", "ubuntu")

        if "OTHERMIRROR" in os.environ:
            othermirrors += os.environ["OTHERMIRROR"].split("|")

        if othermirrors:
            arguments += ["--othermirror", "|".join(othermirrors)]

        # Work around LP:#599695
        if (
            ubuntutools.misc.system_distribution() == "Debian"
            and self.target_distro not in self._debian_distros
        ):
            if not os.path.exists("/usr/share/keyrings/ubuntu-archive-keyring.gpg"):
                Logger.error("ubuntu-keyring not installed")
                sys.exit(1)
            arguments += [
                "--debootstrapopts",
                "--keyring=/usr/share/keyrings/ubuntu-archive-keyring.gpg",
            ]
        elif (
            ubuntutools.misc.system_distribution() == "Ubuntu"
            and self.target_distro in self._debian_distros
        ):
            if not os.path.exists("/usr/share/keyrings/debian-archive-keyring.gpg"):
                Logger.error("debian-archive-keyring not installed")
                sys.exit(1)
            arguments += [
                "--debootstrapopts",
                "--keyring=/usr/share/keyrings/debian-archive-keyring.gpg",
            ]

        arguments += ["--aptcache", aptcache, "--components", components]

        if not os.path.isdir(aptcache):
            try:
                os.makedirs(aptcache)
            except OSError:
                Logger.error('Cannot create aptcache directory "%s"', aptcache)
                sys.exit(1)

        if self.build_architecture != self.system_architecture:
            arguments += ["--debootstrapopts", "--arch=" + self.build_architecture]

        apt_conf_dir = os.path.join(self.base, f"etc/{self.target_distro}/apt.conf")
        if os.path.exists(apt_conf_dir):
            arguments += ["--aptconfdir", apt_conf_dir]

        # Append remaining arguments
        if remaining_arguments:
            arguments.extend(remaining_arguments)

        # Export the distribution and architecture information to the
        # environment so that it is accessible to ~/.pbuilderrc (LP: #628933).
        # With both common variable name schemes (BTS: #659060).
        return [
            self.auth,
            "HOME=" + os.path.expanduser("~"),
            "ARCHITECTURE=" + self.build_architecture,
            "DISTRIBUTION=" + self.target_distro,
            "ARCH=" + self.build_architecture,
            "DIST=" + self.target_distro,
            "DEB_BUILD_OPTIONS=" + os.environ.get("DEB_BUILD_OPTIONS", ""),
            self.builder,
        ] + arguments


def show_help(exit_code=0):
    """help() -> None

    Print a help message for pbuilder-dist, and exit with the given code.
    """
    Logger.info("See  man pbuilder-dist  for more information.")

    sys.exit(exit_code)


def main():
    """main() -> None

    This is pbuilder-dist's main function. It creates a PbuilderDist
    object, modifies all necessary settings taking data from the
    executable's name and command line options and finally either ends
    the script and runs pbuilder itself or exists with an error message.
    """
    script_name = os.path.basename(sys.argv[0])
    parts = script_name.split("-")

    # Copy arguments into another list for save manipulation
    args = sys.argv[1:]

    if "-" in script_name and parts[0] not in ("pbuilder", "cowbuilder") or len(parts) > 3:
        Logger.error('"%s" is not a valid name for a "pbuilder-dist" executable.', script_name)
        sys.exit(1)

    if len(args) < 1:
        Logger.error("Insufficient number of arguments.")
        show_help(1)

    if args[0] in ("-h", "--help", "help"):
        show_help(0)

    app = PbuilderDist(parts[0])

    if len(parts) > 1 and parts[1] != "dist" and "." not in parts[1]:
        app.set_target_distro(parts[1])
    else:
        app.set_target_distro(args.pop(0))

    if len(parts) > 2:
        requested_arch = parts[2]
    elif len(args) > 0:
        if shutil.which("arch-test") is not None:
            arch_test = subprocess.run(
                ["arch-test", args[0]], check=False, stdout=subprocess.DEVNULL
            )
            if arch_test.returncode == 0:
                requested_arch = args.pop(0)
            elif os.path.isdir("/usr/lib/arch-test") and args[0] in os.listdir(
                "/usr/lib/arch-test/"
            ):
                Logger.error(
                    'Architecture "%s" is not supported on your '
                    "currently running kernel. Consider installing "
                    "the qemu-user-static package to enable the use of "
                    "foreign architectures.",
                    args[0],
                )
                sys.exit(1)
            else:
                requested_arch = None
        else:
            Logger.error(
                'Cannot determine if "%s" is a valid architecture. '
                "Please install the arch-test package and retry.",
                args[0],
            )
            sys.exit(1)
    else:
        requested_arch = None

    if requested_arch:
        app.build_architecture = requested_arch
        # For some foreign architectures we need to use qemu
        if requested_arch != app.system_architecture and (
            app.system_architecture,
            requested_arch,
        ) not in [
            ("amd64", "i386"),
            ("arm64", "arm"),
            ("arm64", "armhf"),
            ("powerpc", "ppc64"),
            ("ppc64", "powerpc"),
        ]:
            args += ["--debootstrap", "debootstrap"]

    if "mainonly" in sys.argv or "--main-only" in sys.argv:
        app.extra_components = False
        if "mainonly" in sys.argv:
            args.remove("mainonly")
        else:
            args.remove("--main-only")

    if "--release-only" in sys.argv:
        args.remove("--release-only")
        app.enable_security = False
        app.enable_updates = False
        app.enable_proposed = False
    elif "--security-only" in sys.argv:
        args.remove("--security-only")
        app.enable_updates = False
        app.enable_proposed = False
    elif "--updates-only" in sys.argv:
        args.remove("--updates-only")
        app.enable_proposed = False
    elif "--backports" in sys.argv:
        args.remove("--backports")
        app.enable_backports = True

    if len(args) < 1:
        Logger.error("Insufficient number of arguments.")
        show_help(1)

    # Parse the operation
    args = app.set_operation(args.pop(0)) + args

    if app.operation == "build":
        if len([a for a in args if a.strip().endswith(".dsc")]) != 1:
            msg = "You have to specify one .dsc file if you want to build."
            Logger.error(msg)
            sys.exit(1)

    # Execute the pbuilder command
    if "--debug-echo" not in args:
        sys.exit(subprocess.call(app.get_command(args)))
    else:
        Logger.info(app.get_command([arg for arg in args if arg != "--debug-echo"]))


if __name__ == "__main__":
    try:
        main()
    except KeyboardInterrupt:
        Logger.error("Manually aborted.")
        sys.exit(1)