#!/bin/bash

# Copyright 2012 Hewlett-Packard Development Company, L.P.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.

if [ ${DIB_DEBUG_TRACE:-0} -gt 1 ]; then
    set -x
fi
set -eu
set -o pipefail

EXTRA_ARGS=
ACTION=install
MAP_ELEMENT=

# allow override for dnf, as shipped by default with >=F22
YUM=${YUM:-yum}

# save global xtrace state
_xtrace=$(set +o | grep xtrace)

SCRIPTNAME=$(basename $0)
function show_options () {
    echo "Usage: $SCRIPTNAME [package ...]"
    echo
    echo "Options:"
    echo "    -u          -- update all packages"
    echo "    -d dir      -- download the packages to directory"
    echo "    -e          -- erase/remove packages"
    echo "    -m map      -- use custom element package map (Example: -m nova)"
    exit 0
}

while getopts "hud:em:" opt; do
    case "$opt" in
        u)
            ${YUM} -y update;
            exit 0
            ;;
        d)
            ACTION="download"
            DOWNLOAD_PATH=$OPTARG
            ;;
        e)
            ACTION="remove"
            ;;
        m)
            MAP_ELEMENT=$OPTARG
            ;;
        h)
            show_options
            ;;
        *)
            exit 1
            ;;
    esac
done
shift $((OPTIND-1))


# Packages that aren't available in the distro but requested for installation
# can be ignored by adding them to the exclude list
BLACKLIST=$(cat /tmp/yum-blacklist 2>/dev/null || echo "")
WHITELIST=""
for i in "$@"
do
    PKG_NAME=$i
    if [ -n "$MAP_ELEMENT" ]; then
        if !  PKG_NAME=$(pkg-map --element $MAP_ELEMENT $i); then
            echo "bin/pkg-map error. $PKG_NAME"
            exit 1
        fi
    fi
    if [[ ! ${BLACKLIST[*]} =~ $PKG_NAME ]]; then
        WHITELIST="$WHITELIST $i"
    else
        echo "The package $i is not available and will not be installed"
    fi
done
if [ -n "$WHITELIST" ]; then
    if [ -f /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release ]; then
        rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
    fi
    if [ -n "$MAP_ELEMENT" ]; then
        if ! PKGS=$(pkg-map --element $MAP_ELEMENT $WHITELIST); then
            echo "bin/pkg-map error. $PKGS"
            exit 1
        fi
    else
        PKGS=$(map-packages $WHITELIST)
    fi

    if [ -z "${PKGS}" ]; then
        echo "Not running install-packages $ACTION with empty packages list"
        exit 0
    fi

    echo "Running install-packages ${ACTION}."

    if [ "$ACTION" == "download" ]; then
        mkdir -p $DOWNLOAD_PATH
        if [ ${YUM} == "dnf" ]; then
            dnf download --destdir=$DOWNLOAD_PATH $PKGS
        else
            # note; you don't want to use yum --download only here.
            # Firstly that only puts things in the yum cache
            # directory, and secondly it acts funny if old versions
            # are already in the cache.
            if [ ! -f /usr/bin/yumdownloader ]; then
                yum install -y yum-utils
            fi
            yumdownloader --destdir=$DOWNLOAD_PATH $PKGS
        fi
        exit 0
    fi

    # yum & dnf have a feature/bug where missing packages in a list of
    # packages for install/erase do not raise an error exit [1].
    # There is a corner case when specifying just *one* package, where
    # it will fail if the package is missing.  Thus install-packages
    # follows this behaviour; we may need to re-evaluate this at some
    # point.
    #
    # [1] https://bugzilla.redhat.com/show_bug.cgi?id=965567
    set -o xtrace
    ${YUM} -v -y $ACTION $EXTRA_ARGS $PKGS

    if [ "$ACTION" == "install" ]; then
        if [ ${YUM} == "dnf" ]; then
            # Make sure dnf won't autoremove these packages
            dnf mark install $PKGS
        fi
    fi
    $_xtrace

    # probably not the right place for this; but python-pip package on
    # fedora/rh calls pip "pip-python" while the rest of the work
    # expects it to be just called "pip"
    for pkg in "$@"; do
        if [ "$pkg" = "python-pip" ] ; then
            alternatives --install /usr/bin/pip pip /usr/bin/pip-python 10
        fi
    done
fi
