NBash

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#!/bin/sh
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#
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# Copyright (C) 2012-2015, 2018  Etersoft
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# Copyright (C) 2012-2015, 2018  Vitaly Lipatov <lav@etersoft.ru>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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load_helper epm-install
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load_helper epm-search
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# for zypper before SUSE/11.0
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__use_zypper_dry_run()
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{
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    a='' zypper install --help 2>&1 | grep -q -- "--dry-run" && echo "--dry-run"
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}
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__use_yum_assumeno()
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{
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    a='' yum --help 2>&1 | grep -q -- "--assumeno"
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}
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__check_yum_result()
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{
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    grep -q "^No package" $1 && return 1
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    grep -q "^Complete!" $1 && return 0
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    grep -q "Exiting on user [Cc]ommand" $1 && return 0
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    # dnf issue
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    grep -q "^Operation aborted." $1 && return 0
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    # return default result by default
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    return $2
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}
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__check_pacman_result()
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{
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    grep -q "^error: target not found:" $1 && return 1
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    grep -q "^Total Installed Size:" $1 && return 0
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    grep -q "^Total Download Size:" $1 && return 0
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    # return default result by default
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    return $2
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}
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_epm_do_simulate()
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{
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    local CMD
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    local RES=0
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    local filenames="$*"
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    case $PMTYPE in
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        apt-rpm|apt-dpkg)
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            CMD="apt-get --simulate install"
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            ;;
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        aptitude-dpkg)
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            CMD="aptitude -s install"
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            ;;
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        yum-rpm)
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            if __use_yum_assumeno ; then
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                store_output sudocmd yum --assumeno install $filenames
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                __check_yum_result $RC_STDOUT $?
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            else
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                store_output sudocmd yum install $filenames <<EOF
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n
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EOF
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                __check_yum_result $RC_STDOUT $?
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            fi
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            RES=$?
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            clean_store_output
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            return $RES ;;
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        dnf-rpm)
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            store_output sudocmd dnf --assumeno install $filenames
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            __check_yum_result $RC_STDOUT $?
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            RES=$?
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            clean_store_output
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            return $RES ;;
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        urpm-rpm)
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            CMD="urpmi --test --auto"
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            ;;
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        eopkg)
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            CMD="eopkg --dry-run install"
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            ;;
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        zypper-rpm)
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            if ! __use_zypper_dry_run >/dev/null ; then
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                fatal "zypper is too old: does not support --dry-run"
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            fi
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            CMD="zypper --non-interactive install --dry-run"
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            ;;
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        emerge)
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            local res=0
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            for pkg in $filenames ; do
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            is_installed $pkg && continue
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            docmd emerge --pretend $pkg && continue
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            pkg=1
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            break
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            done
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            return $res ;;
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        opkg)
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            docmd --noaction install $filenames
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            return $res ;;
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        pacman)
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            store_output sudocmd pacman -v -S $filenames <<EOF
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no
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EOF
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            __check_pacman_result $RC_STDOUT $?
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            RES=$?
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            clean_store_output
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            return $RES ;;
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        slackpkg)
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            #docmd /usr/sbin/slackpkg -batch=on -default_answer=yes download
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            # just try search every package
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            # FIXME: epm_search have to return false status code if the package does not found
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            local pkg res
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            res=0
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            for pkg in $filenames ; do
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                # FIXME: -[0-0] does not work in search!
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                # FIXME: we need strict search here (not find gst-plugins-base if search for gst-plugins
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                # TODO: use short?
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                # use verbose for get package status
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                #pkg_filenames="$pkg-[0-9]" verbose=--verbose __epm_search_internal | grep -E "(installed|upgrade)" && continue
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                #pkg_filenames="$pkg" verbose=--verbose __epm_search_internal | grep -E "(installed|upgrade)" && continue
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                __epm_search_internal "$pkg" | grep -q "^$pkg-[0-9]" && continue
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                res=1
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                info "Package '$pkg' does not found in repository."
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            done
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            return $res ;;
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        *)
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            fatal "Have no suitable simulate command for $PMTYPE"
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            ;;
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    esac
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    sudocmd $CMD $filenames
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}
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epm_simulate()
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{
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    [ -z "$pkg_filenames" ] && info "Simulate: Skip empty list" && return 22
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    local filenames="$(echo $pkg_filenames | filter_out_installed_packages)"
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    [ -z "$filenames" ] && info "Simulate: All packages are already installed" && return 0
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    _epm_do_simulate $filenames
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    local RES=$?
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    if [ -z "$quiet" ] ; then
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        if [ "$RES" = 0 ] ; then
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            info "Simulate result: $filenames package(s) CAN BE installed"
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        else
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            info "Simulate result: There are PROBLEMS with install some package(s)"
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        fi
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    fi
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    return $RES
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}
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