NBash

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#!/bin/sh
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#
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# Copyright (C) 2013, 2016, 2018  Etersoft
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# Copyright (C) 2013, 2016, 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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# TODO: will it has local only mode?
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load_helper epm-print
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epm_whatdepends()
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{
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    local CMD
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    [ -n "$pkg_files" ] && fatal "whatdepends does not handle files"
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    [ -n "$pkg_names" ] || fatal "whatdepends: package name is missed"
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    local pkg=$(print_name $pkg_names)
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# by package name
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case $PMTYPE in
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    apt-rpm)
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        if [ -z "$verbose" ] ; then
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            showcmd apt-cache whatdepends $pkg
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            if [ -n "$short" ] ; then
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# TODO: use common converter from full name to short name
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# TODO: see print_pkgname
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                a= apt-cache whatdepends $pkg | grep "^  [^ ]" | sed -e "s|[0-9]*:||" | grep -E -v "(i586-|-debuginfo)" | sed -e 's|[@:].*||' -e "s|-[0-9].*||g" -e 's|^ *||' -e 's/\.32bit//g'
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            else
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                load_helper epm-query
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                a= apt-cache whatdepends $pkg | grep "^  [^ ]" | sed -e "s|[0-9]*:||" | grep -E -v "(i586-|-debuginfo)"
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            fi
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            return
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        fi
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        CMD="apt-cache whatdepends"
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        ;;
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    apt-dpkg|aptitude-dpkg)
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        CMD="apt-cache rdepends"
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        ;;
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    aptitude-dpkg)
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        CMD="aptitude why"
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        ;;
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    packagekit)
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        CMD="pkcon depends-on"
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        ;;
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    yum-rpm)
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        CMD="repoquery --whatrequires"
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        ;;
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    urpm-rpm)
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        CMD="urpmq --whatrequires"
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        ;;
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    dnf-rpm)
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        # check command: dnf repoquery --whatrequires
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        CMD="repoquery --whatrequires"
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        ;;
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    emerge)
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        assure_exists equery
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        CMD="equery depends -a"
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        ;;
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    homebrew)
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        CMD="brew uses"
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        ;;
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    pkgng)
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        CMD="pkg info -r"
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        ;;
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    aptcyg)
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        CMD="apt-cyg rdepends"
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        ;;
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    opkg)
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        CMD="opkg whatdepends"
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        ;;
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    eopkg)
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        showcmd eopkg info $pkg
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        # eopkg info prints it only from repo info
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        LC_ALL=C eopkg info $pkg | grep "^Reverse Dependencies" | sed -e "s|Reverse Dependencies[[:space:]]*: ||" | grep -v "^$"
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        return
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        ;;
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    xbps)
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        CMD="xbps-query -X"
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        ;;
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    *)
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        fatal "Have no suitable command for $PMTYPE"
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        ;;
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esac
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docmd $CMD $pkg
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}
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