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"""
A module to wrap pacman calls, since Arch is the best
(https://wiki.archlinux.org/index.php/Arch_is_the_best)

.. important::
    If you feel that Salt should be using this module to manage packages on a
    minion, and it is using a different module (or gives an error similar to
    *'pkg.install' is not available*), see :ref:`here
    <module-provider-override>`.
"""

import copy
import fnmatch
import logging
import os.path

import salt.utils.args
import salt.utils.data
import salt.utils.functools
import salt.utils.itertools
import salt.utils.pkg
import salt.utils.systemd
from salt.exceptions import CommandExecutionError, MinionError
from salt.utils.versions import LooseVersion

log = logging.getLogger(__name__)

# Define the module's virtual name
__virtualname__ = "pkg"


def __virtual__():
    """
    Set the virtual pkg module if the os is Arch
    """
    if __grains__["os_family"] == "Arch":
        return __virtualname__
    return (False, "The pacman module could not be loaded: unsupported OS family.")


def _list_removed(old, new):
    """
    List the packages which have been removed between the two package objects
    """
    return [x for x in old if x not in new]


def latest_version(*names, **kwargs):
    """
    Return the latest version of the named package available for upgrade or
    installation. If more than one package name is specified, a dict of
    name/version pairs is returned.

    If the latest version of a given package is already installed, an empty
    string will be returned for that package.

    CLI Example:

    .. code-block:: bash

        salt '*' pkg.latest_version <package name>
        salt '*' pkg.latest_version <package1> <package2> <package3> ...
    """
    refresh = salt.utils.data.is_true(kwargs.pop("refresh", False))

    if not names:
        return ""

    # Refresh before looking for the latest version available
    if refresh:
        refresh_db()

    ret = {}
    # Initialize the dict with empty strings
    for name in names:
        ret[name] = ""
    cmd = ["pacman", "-Sp", "--needed", "--print-format", "%n %v"]
    cmd.extend(names)

    if "root" in kwargs:
        cmd.extend(("-r", kwargs["root"]))

    out = __salt__["cmd.run_stdout"](cmd, output_loglevel="trace", python_shell=False)
    for line in salt.utils.itertools.split(out, "\n"):
        try:
            name, version_num = line.split()
            # Only add to return dict if package is in the list of packages
            # passed, otherwise dependencies will make their way into the
            # return data.
            if name in names:
                ret[name] = version_num
        except (ValueError, IndexError):
            pass

    # Return a string if only one package name passed
    if len(names) == 1:
        return ret[names[0]]
    return ret


# available_version is being deprecated
available_version = salt.utils.functools.alias_function(
    latest_version, "available_version"
)


def upgrade_available(name, **kwargs):
    """
    Check whether or not an upgrade is available for a given package

    CLI Example:

    .. code-block:: bash

        salt '*' pkg.upgrade_available <package name>
    """
    return latest_version(name) != ""


def list_upgrades(refresh=False, root=None, **kwargs):  # pylint: disable=W0613
    """
    List all available package upgrades on this system

    CLI Example:

    .. code-block:: bash

        salt '*' pkg.list_upgrades
    """
    upgrades = {}
    cmd = ["pacman", "-S", "-p", "-u", "--print-format", "%n %v"]

    if root is not None:
        cmd.extend(("-r", root))

    if refresh:
        cmd.append("-y")

    call = __salt__["cmd.run_all"](cmd, python_shell=False, output_loglevel="trace")

    if call["retcode"] != 0:
        comment = ""
        if "stderr" in call:
            comment += call["stderr"]
        if "stdout" in call:
            comment += call["stdout"]
        if comment:
            comment = ": " + comment
        raise CommandExecutionError("Error listing upgrades" + comment)
    else:
        out = call["stdout"]

    for line in salt.utils.itertools.split(out, "\n"):
        try:
            pkgname, pkgver = line.split()
        except ValueError:
            continue
        if pkgname.lower() == "downloading" and ".db" in pkgver.lower():
            # Antergos (and possibly other Arch derivatives) add lines when pkg
            # metadata is being downloaded. Because these lines, when split,
            # contain two columns (i.e. 'downloading community.db...'), we will
            # skip this line to keep it from being interpreted as an upgrade.
            continue
        upgrades[pkgname] = pkgver
    return upgrades


def version(*names, **kwargs):
    """
    Returns a string representing the package version or an empty string if not
    installed. If more than one package name is specified, a dict of
    name/version pairs is returned.

    CLI Example:

    .. code-block:: bash

        salt '*' pkg.version <package name>
        salt '*' pkg.version <package1> <package2> <package3> ...
    """
    return __salt__["pkg_resource.version"](*names, **kwargs)


def _list_pkgs_from_context(versions_as_list):
    """
    Use pkg list from __context__
    """
    if versions_as_list:
        return __context__["pkg.list_pkgs"]
    else:
        ret = copy.deepcopy(__context__["pkg.list_pkgs"])
        __salt__["pkg_resource.stringify"](ret)
        return ret


def list_pkgs(versions_as_list=False, **kwargs):
    """
    List the packages currently installed as a dict::

        {'<package_name>': '<version>'}

    CLI Example:

    .. code-block:: bash

        salt '*' pkg.list_pkgs
    """
    versions_as_list = salt.utils.data.is_true(versions_as_list)
    # not yet implemented or not applicable
    if any(
        [salt.utils.data.is_true(kwargs.get(x)) for x in ("removed", "purge_desired")]
    ):
        return {}

    if "pkg.list_pkgs" in __context__ and kwargs.get("use_context", True):
        return _list_pkgs_from_context(versions_as_list)

    cmd = ["pacman", "-Q"]

    if "root" in kwargs:
        cmd.extend(("-r", kwargs["root"]))

    ret = {}
    out = __salt__["cmd.run"](cmd, output_loglevel="trace", python_shell=False)
    for line in salt.utils.itertools.split(out, "\n"):
        if not line:
            continue
        try:
            name, version_num = line.split()[0:2]
        except ValueError:
            log.error(
                "Problem parsing pacman -Q: Unexpected formatting in line: '%s'",
                line,
            )
        else:
            __salt__["pkg_resource.add_pkg"](ret, name, version_num)

    __salt__["pkg_resource.sort_pkglist"](ret)
    __context__["pkg.list_pkgs"] = copy.deepcopy(ret)
    if not versions_as_list:
        __salt__["pkg_resource.stringify"](ret)
    return ret


def group_list():
    """
    .. versionadded:: 2016.11.0

    Lists all groups known by pacman on this system

    CLI Example:

    .. code-block:: bash

        salt '*' pkg.group_list
    """

    ret = {"installed": [], "partially_installed": [], "available": []}

    # find out what's available

    cmd = ["pacman", "-Sgg"]
    out = __salt__["cmd.run"](cmd, output_loglevel="trace", python_shell=False)

    available = {}

    for line in salt.utils.itertools.split(out, "\n"):
        if not line:
            continue
        try:
            group, pkg = line.split()[0:2]
        except ValueError:
            log.error(
                "Problem parsing pacman -Sgg: Unexpected formatting in line: '%s'",
                line,
            )
        else:
            available.setdefault(group, []).append(pkg)

    # now get what's installed

    cmd = ["pacman", "-Qg"]
    out = __salt__["cmd.run"](cmd, output_loglevel="trace", python_shell=False)
    installed = {}
    for line in salt.utils.itertools.split(out, "\n"):
        if not line:
            continue
        try:
            group, pkg = line.split()[0:2]
        except ValueError:
            log.error(
                "Problem parsing pacman -Qg: Unexpected formatting in line: '%s'",
                line,
            )
        else:
            installed.setdefault(group, []).append(pkg)

    # move installed and partially-installed items from available to appropriate other places

    for group in installed:
        if group not in available:
            log.error(
                "Pacman reports group %s installed, but it is not in the "
                "available list (%s)!",
                group,
                available,
            )
            continue
        if len(installed[group]) == len(available[group]):
            ret["installed"].append(group)
        else:
            ret["partially_installed"].append(group)
        available.pop(group)

    ret["installed"].sort()
    ret["partially_installed"].sort()

    # Now installed and partially installed are set, whatever is left is the available list.
    # In Python 3, .keys() returns an iterable view instead of a list. sort() cannot be
    # called on views. Use sorted() instead. Plus it's just as efficient as sort().
    ret["available"] = sorted(available.keys())

    return ret


def group_info(name):
    """
    .. versionadded:: 2016.11.0

    Lists all packages in the specified group

    CLI Example:

    .. code-block:: bash

        salt '*' pkg.group_info 'xorg'
    """

    pkgtypes = ("mandatory", "optional", "default", "conditional")
    ret = {}
    for pkgtype in pkgtypes:
        ret[pkgtype] = set()

    cmd = ["pacman", "-Sgg", name]
    out = __salt__["cmd.run"](cmd, output_loglevel="trace", python_shell=False)

    for line in salt.utils.itertools.split(out, "\n"):
        if not line:
            continue
        try:
            pkg = line.split()[1]
        except ValueError:
            log.error(
                "Problem parsing pacman -Sgg: Unexpected formatting in line: '%s'",
                line,
            )
        else:
            ret["default"].add(pkg)

    for pkgtype in pkgtypes:
        ret[pkgtype] = sorted(ret[pkgtype])

    return ret


def group_diff(name):
    """
    .. versionadded:: 2016.11.0

    Lists which of a group's packages are installed and which are not
    installed

    Compatible with yumpkg.group_diff for easy support of state.pkg.group_installed

    CLI Example:

    .. code-block:: bash

        salt '*' pkg.group_diff 'xorg'
    """

    # Use a compatible structure with yum, so we can leverage the existing state.group_installed
    # In pacmanworld, everything is the default, but nothing is mandatory

    pkgtypes = ("mandatory", "optional", "default", "conditional")
    ret = {}
    for pkgtype in pkgtypes:
        ret[pkgtype] = {"installed": [], "not installed": []}

    # use indirect references to simplify unit testing
    pkgs = __salt__["pkg.list_pkgs"]()
    group_pkgs = __salt__["pkg.group_info"](name)
    for pkgtype in pkgtypes:
        for member in group_pkgs.get(pkgtype, []):
            if member in pkgs:
                ret[pkgtype]["installed"].append(member)
            else:
                ret[pkgtype]["not installed"].append(member)
    return ret


def refresh_db(root=None, **kwargs):
    """
    Just run a ``pacman -Sy``, return a dict::

        {'<database name>': Bool}

    CLI Example:

    .. code-block:: bash

        salt '*' pkg.refresh_db
    """
    # Remove rtag file to keep multiple refreshes from happening in pkg states
    salt.utils.pkg.clear_rtag(__opts__)
    cmd = ["pacman", "-Sy"]

    if root is not None:
        cmd.extend(("-r", root))

    ret = {}
    call = __salt__["cmd.run_all"](
        cmd, output_loglevel="trace", env={"LANG": "C"}, python_shell=False
    )
    if call["retcode"] != 0:
        comment = ""
        if "stderr" in call:
            comment += ": " + call["stderr"]
        raise CommandExecutionError("Error refreshing package database" + comment)
    else:
        out = call["stdout"]

    for line in salt.utils.itertools.split(out, "\n"):
        if line.strip().startswith("::"):
            continue
        if not line:
            continue
        key = line.strip().split()[0]
        if "is up to date" in line:
            ret[key] = False
        elif "downloading" in line:
            key = line.strip().split()[1].split(".")[0]
            ret[key] = True
    return ret


def install(
    name=None, refresh=False, sysupgrade=None, pkgs=None, sources=None, **kwargs
):
    """
    .. versionchanged:: 2015.8.12,2016.3.3,2016.11.0
        On minions running systemd>=205, `systemd-run(1)`_ is now used to
        isolate commands which modify installed packages from the
        ``salt-minion`` daemon's control group. This is done to keep systemd
        from killing any pacman commands spawned by Salt when the
        ``salt-minion`` service is restarted. (see ``KillMode`` in the
        `systemd.kill(5)`_ manpage for more information). If desired, usage of
        `systemd-run(1)`_ can be suppressed by setting a :mod:`config option
        <salt.modules.config.get>` called ``systemd.scope``, with a value of
        ``False`` (no quotes).

    .. _`systemd-run(1)`: https://www.freedesktop.org/software/systemd/man/systemd-run.html
    .. _`systemd.kill(5)`: https://www.freedesktop.org/software/systemd/man/systemd.kill.html

    Install (``pacman -S``) the specified packag(s). Add ``refresh=True`` to
    install with ``-y``, add ``sysupgrade=True`` to install with ``-u``.

    name
        The name of the package to be installed. Note that this parameter is
        ignored if either ``pkgs`` or ``sources`` is passed. Additionally,
        please note that this option can only be used to install packages from
        a software repository. To install a package file manually, use the
        ``sources`` option.

        CLI Example:

        .. code-block:: bash

            salt '*' pkg.install <package name>

    refresh
        Whether or not to refresh the package database before installing.

    sysupgrade
        Whether or not to upgrade the system packages before installing.
        If refresh is set to ``True`` but sysupgrade is not specified, ``-u`` will be
        applied

    Multiple Package Installation Options:

    pkgs
        A list of packages to install from a software repository. Must be
        passed as a python list. A specific version number can be specified
        by using a single-element dict representing the package and its
        version. As with the ``version`` parameter above, comparison operators
        can be used to target a specific version of a package.

        CLI Examples:

        .. code-block:: bash

            salt '*' pkg.install pkgs='["foo", "bar"]'
            salt '*' pkg.install pkgs='["foo", {"bar": "1.2.3-4"}]'
            salt '*' pkg.install pkgs='["foo", {"bar": "<1.2.3-4"}]'

    sources
        A list of packages to install. Must be passed as a list of dicts,
        with the keys being package names, and the values being the source URI
        or local path to the package.

        CLI Example:

        .. code-block:: bash

            salt '*' pkg.install \
                sources='[{"foo": "salt://foo.pkg.tar.xz"}, \
                {"bar": "salt://bar.pkg.tar.xz"}]'


    Returns a dict containing the new package names and versions::

        {'<package>': {'old': '<old-version>',
                       'new': '<new-version>'}}
    """
    try:
        pkg_params, pkg_type = __salt__["pkg_resource.parse_targets"](
            name, pkgs, sources, **kwargs
        )
    except MinionError as exc:
        raise CommandExecutionError(exc)

    if not pkg_params:
        return {}

    if "root" in kwargs:
        pkg_params["-r"] = kwargs["root"]

    cmd = []
    if salt.utils.systemd.has_scope(__context__) and __salt__["config.get"](
        "systemd.scope", True
    ):
        cmd.extend(["systemd-run", "--scope"])
    cmd.append("pacman")

    errors = []
    targets = []
    if pkg_type == "file":
        cmd.extend(["-U", "--noprogressbar", "--noconfirm"])
        cmd.extend(pkg_params)
    elif pkg_type == "repository":
        cmd.append("-S")
        if refresh is True:
            cmd.append("-y")
        if sysupgrade is True:
            cmd.append("-u")
        cmd.extend(["--noprogressbar", "--noconfirm", "--needed"])
        wildcards = []
        for param, version_num in pkg_params.items():
            if version_num is None:
                targets.append(param)
            else:
                prefix, verstr = salt.utils.pkg.split_comparison(version_num)
                if not prefix:
                    prefix = "="
                if "*" in verstr:
                    if prefix == "=":
                        wildcards.append((param, verstr))
                    else:
                        errors.append(f"Invalid wildcard for {param}{prefix}{verstr}")
                    continue
                targets.append(f"{param}{prefix}{verstr}")

        if wildcards:
            # Resolve wildcard matches
            _available = list_repo_pkgs(*[x[0] for x in wildcards], refresh=refresh)
            for pkgname, verstr in wildcards:
                candidates = _available.get(pkgname, [])
                match = salt.utils.itertools.fnmatch_multiple(candidates, verstr)
                if match is not None:
                    targets.append("=".join((pkgname, match)))
                else:
                    errors.append(
                        "No version matching '{}' found for package '{}' "
                        "(available: {})".format(
                            verstr,
                            pkgname,
                            ", ".join(candidates) if candidates else "none",
                        )
                    )

            if refresh:
                try:
                    # Prevent a second refresh when we run the install command
                    cmd.remove("-y")
                except ValueError:
                    # Shouldn't happen since we only add -y when refresh is True,
                    # but just in case that code above is inadvertently changed,
                    # don't let this result in a traceback.
                    pass

    if not errors:
        cmd.extend(targets)
        old = list_pkgs()
        out = __salt__["cmd.run_all"](cmd, output_loglevel="trace", python_shell=False)

        if out["retcode"] != 0 and out["stderr"]:
            errors = [out["stderr"]]
        else:
            errors = []

        __context__.pop("pkg.list_pkgs", None)
        new = list_pkgs()
        ret = salt.utils.data.compare_dicts(old, new)

    if errors:
        try:
            changes = ret
        except UnboundLocalError:
            # We ran into errors before we attempted to install anything, so
            # there are no changes.
            changes = {}
        raise CommandExecutionError(
            "Problem encountered installing package(s)",
            info={"errors": errors, "changes": changes},
        )

    return ret


def upgrade(refresh=False, root=None, **kwargs):
    """
    .. versionchanged:: 2015.8.12,2016.3.3,2016.11.0
        On minions running systemd>=205, `systemd-run(1)`_ is now used to
        isolate commands which modify installed packages from the
        ``salt-minion`` daemon's control group. This is done to keep systemd
        from killing any pacman commands spawned by Salt when the
        ``salt-minion`` service is restarted. (see ``KillMode`` in the
        `systemd.kill(5)`_ manpage for more information). If desired, usage of
        `systemd-run(1)`_ can be suppressed by setting a :mod:`config option
        <salt.modules.config.get>` called ``systemd.scope``, with a value of
        ``False`` (no quotes).

    .. _`systemd-run(1)`: https://www.freedesktop.org/software/systemd/man/systemd-run.html
    .. _`systemd.kill(5)`: https://www.freedesktop.org/software/systemd/man/systemd.kill.html

    Run a full system upgrade, a pacman -Syu

    refresh
        Whether or not to refresh the package database before installing.

    Returns a dictionary containing the changes:

    .. code-block:: python

        {'<package>':  {'old': '<old-version>',
                        'new': '<new-version>'}}

    CLI Example:

    .. code-block:: bash

        salt '*' pkg.upgrade
    """
    ret = {"changes": {}, "result": True, "comment": ""}

    old = list_pkgs()

    cmd = []
    if salt.utils.systemd.has_scope(__context__) and __salt__["config.get"](
        "systemd.scope", True
    ):
        cmd.extend(["systemd-run", "--scope"])
    cmd.extend(["pacman", "-Su", "--noprogressbar", "--noconfirm"])
    if salt.utils.data.is_true(refresh):
        cmd.append("-y")

    if root is not None:
        cmd.extend(("-r", root))

    result = __salt__["cmd.run_all"](cmd, output_loglevel="trace", python_shell=False)
    __context__.pop("pkg.list_pkgs", None)
    new = list_pkgs()
    ret = salt.utils.data.compare_dicts(old, new)

    if result["retcode"] != 0:
        raise CommandExecutionError(
            "Problem encountered upgrading packages",
            info={"changes": ret, "result": result},
        )

    return ret


def _uninstall(action="remove", name=None, pkgs=None, **kwargs):
    """
    remove and purge do identical things but with different pacman commands,
    this function performs the common logic.
    """
    try:
        pkg_params = __salt__["pkg_resource.parse_targets"](name, pkgs)[0]
    except MinionError as exc:
        raise CommandExecutionError(exc)

    old = list_pkgs()
    targets = [x for x in pkg_params if x in old]
    if not targets:
        return {}

    remove_arg = "-Rsc" if action == "purge" else "-R"

    cmd = []
    if salt.utils.systemd.has_scope(__context__) and __salt__["config.get"](
        "systemd.scope", True
    ):
        cmd.extend(["systemd-run", "--scope"])
    cmd.extend(["pacman", remove_arg, "--noprogressbar", "--noconfirm"])
    cmd.extend(targets)

    if "root" in kwargs:
        cmd.extend(("-r", kwargs["root"]))

    out = __salt__["cmd.run_all"](cmd, output_loglevel="trace", python_shell=False)

    if out["retcode"] != 0 and out["stderr"]:
        errors = [out["stderr"]]
    else:
        errors = []

    __context__.pop("pkg.list_pkgs", None)
    new = list_pkgs()
    ret = salt.utils.data.compare_dicts(old, new)

    if errors:
        raise CommandExecutionError(
            "Problem encountered removing package(s)",
            info={"errors": errors, "changes": ret},
        )

    return ret


def remove(name=None, pkgs=None, **kwargs):
    """
    .. versionchanged:: 2015.8.12,2016.3.3,2016.11.0
        On minions running systemd>=205, `systemd-run(1)`_ is now used to
        isolate commands which modify installed packages from the
        ``salt-minion`` daemon's control group. This is done to keep systemd
        from killing any pacman commands spawned by Salt when the
        ``salt-minion`` service is restarted. (see ``KillMode`` in the
        `systemd.kill(5)`_ manpage for more information). If desired, usage of
        `systemd-run(1)`_ can be suppressed by setting a :mod:`config option
        <salt.modules.config.get>` called ``systemd.scope``, with a value of
        ``False`` (no quotes).

    .. _`systemd-run(1)`: https://www.freedesktop.org/software/systemd/man/systemd-run.html
    .. _`systemd.kill(5)`: https://www.freedesktop.org/software/systemd/man/systemd.kill.html

    Remove packages with ``pacman -R``.

    name
        The name of the package to be deleted.


    Multiple Package Options:

    pkgs
        A list of packages to delete. Must be passed as a python list. The
        ``name`` parameter will be ignored if this option is passed.

    .. versionadded:: 0.16.0


    Returns a dict containing the changes.

    CLI Example:

    .. code-block:: bash

        salt '*' pkg.remove <package name>
        salt '*' pkg.remove <package1>,<package2>,<package3>
        salt '*' pkg.remove pkgs='["foo", "bar"]'
    """
    return _uninstall(action="remove", name=name, pkgs=pkgs)


def purge(name=None, pkgs=None, **kwargs):
    """
    .. versionchanged:: 2015.8.12,2016.3.3,2016.11.0
        On minions running systemd>=205, `systemd-run(1)`_ is now used to
        isolate commands which modify installed packages from the
        ``salt-minion`` daemon's control group. This is done to keep systemd
        from killing any pacman commands spawned by Salt when the
        ``salt-minion`` service is restarted. (see ``KillMode`` in the
        `systemd.kill(5)`_ manpage for more information). If desired, usage of
        `systemd-run(1)`_ can be suppressed by setting a :mod:`config option
        <salt.modules.config.get>` called ``systemd.scope``, with a value of
        ``False`` (no quotes).

    .. _`systemd-run(1)`: https://www.freedesktop.org/software/systemd/man/systemd-run.html
    .. _`systemd.kill(5)`: https://www.freedesktop.org/software/systemd/man/systemd.kill.html

    Recursively remove a package and all dependencies which were installed
    with it, this will call a ``pacman -Rsc``

    name
        The name of the package to be deleted.


    Multiple Package Options:

    pkgs
        A list of packages to delete. Must be passed as a python list. The
        ``name`` parameter will be ignored if this option is passed.

    .. versionadded:: 0.16.0


    Returns a dict containing the changes.

    CLI Example:

    .. code-block:: bash

        salt '*' pkg.purge <package name>
        salt '*' pkg.purge <package1>,<package2>,<package3>
        salt '*' pkg.purge pkgs='["foo", "bar"]'
    """
    return _uninstall(action="purge", name=name, pkgs=pkgs)


def file_list(*packages, **kwargs):
    """
    List the files that belong to a package. Not specifying any packages will
    return a list of _every_ file on the system's package database (not
    generally recommended).

    CLI Examples:

    .. code-block:: bash

        salt '*' pkg.file_list httpd
        salt '*' pkg.file_list httpd postfix
        salt '*' pkg.file_list
    """
    errors = []
    ret = []
    cmd = ["pacman", "-Ql"]

    if packages and os.path.exists(packages[0]):
        packages = list(packages)
        cmd.extend(("-r", packages.pop(0)))

    cmd.extend(packages)

    out = __salt__["cmd.run"](cmd, output_loglevel="trace", python_shell=False)
    for line in salt.utils.itertools.split(out, "\n"):
        if line.startswith("error"):
            errors.append(line)
        else:
            comps = line.split()
            ret.append(" ".join(comps[1:]))
    return {"errors": errors, "files": ret}


def file_dict(*packages, **kwargs):
    """
    List the files that belong to a package, grouped by package. Not
    specifying any packages will return a list of _every_ file on the system's
    package database (not generally recommended).

    CLI Examples:

    .. code-block:: bash

        salt '*' pkg.file_list httpd
        salt '*' pkg.file_list httpd postfix
        salt '*' pkg.file_list
    """
    errors = []
    ret = {}
    cmd = ["pacman", "-Ql"]

    if packages and os.path.exists(packages[0]):
        packages = list(packages)
        cmd.extend(("-r", packages.pop(0)))

    cmd.extend(packages)

    out = __salt__["cmd.run"](cmd, output_loglevel="trace", python_shell=False)
    for line in salt.utils.itertools.split(out, "\n"):
        if line.startswith("error"):
            errors.append(line)
        else:
            comps = line.split()
            if not comps[0] in ret:
                ret[comps[0]] = []
            ret[comps[0]].append(" ".join(comps[1:]))
    return {"errors": errors, "packages": ret}


def owner(*paths, **kwargs):
    """
    .. versionadded:: 2014.7.0

    Return the name of the package that owns the file. Multiple file paths can
    be passed. Like :mod:`pkg.version <salt.modules.yumpkg.version>`, if a
    single path is passed, a string will be returned, and if multiple paths are
    passed, a dictionary of file/package name pairs will be returned.

    If the file is not owned by a package, or is not present on the minion,
    then an empty string will be returned for that path.

    CLI Example:

    .. code-block:: bash

        salt '*' pkg.owner /usr/bin/apachectl
        salt '*' pkg.owner /usr/bin/apachectl /usr/bin/zsh
    """
    if not paths:
        return ""
    ret = {}
    cmd_prefix = ["pacman", "-Qqo"]

    for path in paths:
        ret[path] = __salt__["cmd.run_stdout"](cmd_prefix + [path], python_shell=False)
    if len(ret) == 1:
        return next(iter(ret.values()))
    return ret


def list_repo_pkgs(*args, **kwargs):
    """
    Returns all available packages. Optionally, package names (and name globs)
    can be passed and the results will be filtered to packages matching those
    names.

    This function can be helpful in discovering the version or repo to specify
    in a :mod:`pkg.installed <salt.states.pkg.installed>` state.

    The return data will be a dictionary mapping package names to a list of
    version numbers, ordered from newest to oldest. If ``byrepo`` is set to
    ``True``, then the return dictionary will contain repository names at the
    top level, and each repository will map packages to lists of version
    numbers. For example:

    .. code-block:: python

        # With byrepo=False (default)
        {
            'bash': ['4.4.005-2'],
            'nginx': ['1.10.2-2']
        }
        # With byrepo=True
        {
            'core': {
                'bash': ['4.4.005-2']
            },
            'extra': {
                'nginx': ['1.10.2-2']
            }
        }

    fromrepo : None
        Only include results from the specified repo(s). Multiple repos can be
        specified, comma-separated.

    byrepo : False
        When ``True``, the return data for each package will be organized by
        repository.

    refresh : False
        When ``True``, the package database will be refreshed (i.e. ``pacman
        -Sy``) before checking for available versions.

    CLI Examples:

    .. code-block:: bash

        salt '*' pkg.list_repo_pkgs
        salt '*' pkg.list_repo_pkgs foo bar baz
        salt '*' pkg.list_repo_pkgs 'samba4*' fromrepo=base,updates
        salt '*' pkg.list_repo_pkgs 'python2-*' byrepo=True
    """
    kwargs = salt.utils.args.clean_kwargs(**kwargs)
    fromrepo = kwargs.pop("fromrepo", "") or ""
    byrepo = kwargs.pop("byrepo", False)
    refresh = kwargs.pop("refresh", False)
    if kwargs:
        salt.utils.args.invalid_kwargs(kwargs)

    if fromrepo:
        try:
            repos = [x.strip() for x in fromrepo.split(",")]
        except AttributeError:
            repos = [x.strip() for x in str(fromrepo).split(",")]
    else:
        repos = []

    if refresh:
        refresh_db()

    out = __salt__["cmd.run_all"](
        ["pacman", "-Sl"],
        output_loglevel="trace",
        ignore_retcode=True,
        python_shell=False,
    )

    ret = {}
    for line in salt.utils.itertools.split(out["stdout"], "\n"):
        try:
            repo, pkg_name, pkg_ver = line.strip().split()[:3]
        except ValueError:
            continue

        if repos and repo not in repos:
            continue

        if args:
            for arg in args:
                if fnmatch.fnmatch(pkg_name, arg):
                    skip_pkg = False
                    break
            else:
                # Package doesn't match any of the passed args, skip it
                continue

        ret.setdefault(repo, {}).setdefault(pkg_name, []).append(pkg_ver)

    if byrepo:
        for reponame in ret:
            # Sort versions newest to oldest
            for pkgname in ret[reponame]:
                sorted_versions = sorted(
                    (LooseVersion(x) for x in ret[reponame][pkgname]), reverse=True
                )
                ret[reponame][pkgname] = [x.vstring for x in sorted_versions]
        return ret
    else:
        byrepo_ret = {}
        for reponame in ret:
            for pkgname in ret[reponame]:
                byrepo_ret.setdefault(pkgname, []).extend(ret[reponame][pkgname])
        for pkgname in byrepo_ret:
            sorted_versions = sorted(
                (LooseVersion(x) for x in byrepo_ret[pkgname]), reverse=True
            )
            byrepo_ret[pkgname] = [x.vstring for x in sorted_versions]
        return byrepo_ret