NBash

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#!/bin/sh
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#
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# Copyright (C) 2012, 2016  Etersoft
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# Copyright (C) 2012, 2016  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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__epm_changelog_apt()
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{
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    local i
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    for i in $@ ; do
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        docmd apt-cache show $i | grep -A 1000 "^Changelog:"
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    done
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}
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__epm_changelog_files()
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{
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    [ -z "$*" ] && return
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    # TODO: detect every file
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    case $(get_package_type $1) in
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        rpm)
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            assure_exists rpm
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            docmd_foreach "rpm -q -p --changelog" $@
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            ;;
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#        deb)
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#            
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#            ;;
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        *)
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            fatal "Have no suitable command for $1"
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            ;;
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    esac
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}
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__epm_changelog_local_names()
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{
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    [ -z "$*" ] && return
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    case $PMTYPE in
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        apt-rpm|yum-rpm|dnf-rpm|urpm-rpm|zypper-rpm)
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            docmd_foreach "rpm -q --changelog" $@
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            ;;
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        apt-dpkg|aptitude-dpkg)
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            docmd zcat /usr/share/doc/$1/changelog.Debian.gz
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            ;;
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        emerge)
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            assure_exists equery
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            docmd equery changes -f $1
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            ;;
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        pacman)
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            docmd pacman -Qc $1
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            ;;
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        *)
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            fatal "Have no suitable command for $PMTYPE"
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            ;;
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    esac
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}
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__epm_changelog_unlocal_names()
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{
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    [ -z "$*" ] && return
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    case $PMTYPE in
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        apt-rpm)
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            __epm_changelog_apt "$1"
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            ;;
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        #apt-dpkg)
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        #    # FIXME: only first pkg
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        #    docmd zcat /usr/share/doc/$1/changelog.Debian.gz | less
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        #    ;;
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        #yum-rpm)
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        #    sudocmd yum clean all
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        #    ;;
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        urpm-rpm)
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            docmd urpmq --changelog "$1"
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            ;;
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        #zypper-rpm)
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        #    sudocmd zypper clean
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        #    ;;
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        emerge)
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            assure_exists equery
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            docmd equery changes -f "$1"
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            ;;
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        *)
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            fatal "Have no suitable command for $PMTYPE. Try install the package firstly."
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            ;;
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    esac
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}
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epm_changelog()
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{
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    [ -n "$pkg_filenames" ] || fatal "Changelog: Missing package(s) name"
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    __epm_changelog_files $pkg_files
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    # TODO: add less or bat
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    local pkg
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    for pkg in $pkg_names ; do
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        if is_installed $pkg ; then
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            __epm_changelog_local_names $pkg
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        else
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            __epm_changelog_unlocal_names $pkg
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        fi
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    done
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}
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