NBash

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#!/bin/sh
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#
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# Copyright (C) 2012-2013, 2016, 2018, 2019, 2022  Etersoft
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# Copyright (C) 2012-2013, 2016, 2018, 2019, 2022  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-query
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load_helper epm-print
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__epm_filter_out_base_alt_reqs()
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{
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    grep -E -v "(^rpmlib\(|^/bin/sh|^/bin/bash|^rtld\(GNU_HASH\)|ld-linux)"
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}
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__epm_alt_rpm_requires()
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{
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    if [ -n "$short" ] ; then
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        # TODO see also rpmreqs from etersoft-build-utils
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        docmd rpm -q --requires "$@" | __epm_filter_out_base_alt_reqs | sed -e "s| .*||"
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    else
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        docmd rpm -q --requires "$@" | __epm_filter_out_base_alt_reqs
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    fi
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}
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get_linked_shared_libs()
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{
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    assure_exists readelf binutils
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    #is_command readelf || fatal "Can't get required shared library: readelf is missed. Try install binutils package."
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    #ldd "$exe" | sed -e 's|[[:space:]]*||' | grep "^lib.*[[:space:]]=>[[:space:]]\(/usr/lib\|/lib\)" | sed -e 's|[[:space:]].*||'
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    LC_ALL=C readelf -d "$1" | grep "(NEEDED)" | grep "Shared library:" | sed -e 's|.*Shared library: \[||' -e 's|\]$||' | grep "^lib"
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}
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__epm_elf32_requires()
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{
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    get_linked_shared_libs "$1"
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}
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__epm_elf64_requires()
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{
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    get_linked_shared_libs "$1" | sed -e 's|$|()(64bit)|'
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}
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__epm_elf_requires()
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{
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    local i
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    if [ -n "$direct" ] ; then
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        for i in $* ; do
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            get_linked_shared_libs $i
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        done
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        return
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    fi
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    for i in $* ; do
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        if file "$i" | grep -q " ELF 32-bit " ; then
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            __epm_elf32_requires "$i"
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        elif file "$i" | grep -q " ELF 64-bit " ; then
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            __epm_elf64_requires "$i"
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        else
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            warning "Unknown ELF binary"
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        fi
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    done
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}
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epm_requires_files()
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{
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    local pkg_files="$*"
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    [ -n "$pkg_files" ] || return
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    # TODO: handle separately
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    local PKGTYPE="$(get_package_type $pkg_files)"
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    case "$PKGTYPE" in
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        rpm)
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            assure_exists rpm >/dev/null
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            __epm_alt_rpm_requires -p $pkg_files
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            ;;
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        deb)
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            assure_exists dpkg >/dev/null
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            a='' docmd dpkg -I $pkg_files | grep "^ *Depends:" | sed "s|^ *Depends:||g"
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            ;;
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        eopkg)
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            showcmd eopkg info $pkg_files
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            LC_ALL=C eopkg info $pkg_files | grep "^Dependencies" | head -n1 | sed -e "s|Dependencies[[:space:]]*: ||"
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            ;;
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        ELF)
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            __epm_elf_requires $pkg_files
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            ;;
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        *)
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            fatal "Have no suitable command for $PKGTYPE"
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            ;;
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    esac
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}
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epm_requires_names()
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{
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    local pkg_names="$*"
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    local CMD
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    [ -n "$pkg_names" ] || return
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# by package name
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case $PMTYPE in
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    apt-rpm)
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        # FIXME: need fix for a few names case
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        # FIXME: too low level of requires name (libSOME.so)
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        if is_installed $pkg_names ; then
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            assure_exists rpm >/dev/null
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            __epm_alt_rpm_requires $pkg_names
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            return
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        else
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            if [ -n "$verbose" ] ; then
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                CMD="apt-cache depends"
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            else
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                if [ -n "$short" ] ; then
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                    LC_ALL=C docmd apt-cache depends $pkg_names | grep "Depends:" | sed -e 's|, |\n|g' -e "s|.*Depends: ||" -e "s|<\(.*\)>|\1|" | __epm_filter_out_base_alt_reqs | sed -e "s| .*||"
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                else
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                    LC_ALL=C docmd apt-cache depends $pkg_names | grep "Depends:" | sed -e 's|, |\n|g' -e "s|.*Depends: ||" -e "s|<\(.*\)>|\1|" | __epm_filter_out_base_alt_reqs
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                fi
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                return
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            fi
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        fi
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        ;;
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    packagekit)
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        CMD="pkcon required-by"
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        ;;
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    #zypper-rpm)
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    #    # FIXME: use hi level commands
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    #    CMD="rpm -q --requires"
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    #    ;;
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    urpm-rpm)
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        CMD="urpmq --requires"
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        ;;
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    yum-rpm)
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        if is_installed $pkg_names ; then
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            CMD="rpm -q --requires"
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        else
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            CMD="yum deplist"
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        fi
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        ;;
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    dnf-rpm)
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        if is_installed $pkg_names ; then
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            CMD="rpm -q --requires"
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        else
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            CMD="dnf repoquery --requires"
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        fi
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        ;;
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    pacman)
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        CMD="pactree"
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        ;;
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    apt-dpkg|aptitude-dpkg)
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        # FIXME: need fix for a few names case
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        if is_installed $pkg_names ; then
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            showcmd dpkg -s $pkg_names
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            a='' dpkg -s $pkg_names | grep "^Depends:" | sed "s|^Depends:||g"
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            return
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        else
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            CMD="apt-cache depends"
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        fi
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        ;;
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    emerge)
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        assure_exists equery
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        CMD="equery depgraph"
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        ;;
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    homebrew)
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        #docmd brew info $pkg_names | grep "^Required: " | sed -s "|s|^Requires: ||"
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        docmd brew deps $pkg_names
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        return
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        ;;
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    pkgng)
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        #CMD="pkg rquery '%dn-%dv'"
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        CMD="pkg info -d"
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        ;;
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    opkg)
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        CMD="opkg depends"
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        ;;
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    eopkg)
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        showcmd eopkg info $pkg_names
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        LC_ALL=C eopkg info $pkg_names | grep "^Dependencies" | sed -e "s|Dependencies[[:space:]]*: ||"
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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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    aptcyg)
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        #CMD="apt-cyg depends"
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        # print show version
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        docmd apt-cyg show $pkg_names | grep "^requires: " | sed "s|^requires: ||g"
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        return
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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 $pkg_names
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}
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epm_requires()
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{
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    # if possible, it will put pkg_urls into pkg_files or pkg_names
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    if [ -n "$pkg_urls" ] ; then
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        load_helper epm-download
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        __handle_pkg_urls_to_checking
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    fi
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    [ -n "$pkg_filenames" ] || fatal "Requires: package name is missed"
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    epm_requires_files $pkg_files
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    # shellcheck disable=SC2046
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    epm_requires_names $(print_name $pkg_names)
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}
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