NBash

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#!/bin/sh
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#
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# Copyright (C) 2013-2016  Etersoft
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# Copyright (C) 2013-2016  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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__check_command_in_path()
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{
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    # with hack for sudo case
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    ( PATH=$PATH:/sbin:/usr/sbin print_command_path "$1" )
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}
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# returns TRUE if package version is omitted, or package is not installed, or version is too old
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__epm_need_update()
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{
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    local PACKAGE="$1"
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    local PACKAGEVERSION="$2"
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    [ -n "$PACKAGEVERSION" ] || return 0
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    load_helper epm-query
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    is_installed "$PACKAGE" || return 0
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    load_helper epm-print
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    # epm print version for package N
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    local INSTALLEDVERSION=$(query_package_field "version" "$PACKAGE")
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    # if needed >= installed, return 0
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    [ "$(compare_version "$PACKAGEVERSION" "$INSTALLEDVERSION")" -gt 0 ] && return 0
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    return 1
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}
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__epm_assure_checking()
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{
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    local CMD="$1"
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    local PACKAGE="$2"
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    local PACKAGEVERSION="$3"
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    [ -n "$PACKAGEVERSION" ] && return 1
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    if is_dirpath "$CMD" ; then
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        # TODO: check for /usr/bin, /bin, /usr/sbin, /sbin
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        if [ -e "$CMD" ] ; then
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            if [ -n "$verbose" ] ; then
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                info "File or directory $CMD is already exists."
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                epm qf "$CMD" >&2
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            fi
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            return 0
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        fi
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        [ -n "$PACKAGE" ] || fatal "You need run with package name param when use with absolute path to non executable file"
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        return 1
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    fi
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    if __check_command_in_path "$CMD" >/dev/null ; then
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        if [ -n "$verbose" ] ; then
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            local compath="$(__check_command_in_path "$1")"
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            info "Command $CMD is exists: $compath"
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            epm qf "$compath" >&2
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        fi
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        return 0
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    fi
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    return 1
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}
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# Do fast checking for command and install package if the command does not exist
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# $1 - command name
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# $2 - [package name]
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# $3 - [needed package version]
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epm_assure()
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{
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    local CMD="$1"
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    local PACKAGE="$2"
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    local PACKAGEVERSION="$3"
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    [ -n "$PACKAGE" ] || PACKAGE="$1"
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    __epm_assure_checking $CMD $PACKAGE $PACKAGEVERSION && return 0
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    info "Installing appropriate package for $CMD command..."
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    __epm_need_update $PACKAGE $PACKAGEVERSION || return 0
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    # can't be used in epm ei case
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    #docmd epm --auto install $PACKAGE || return
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    load_helper epm-install
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    (repack='' pkg_names="$PACKAGE" pkg_files='' pkg_urls='' epm_install ) || return
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    # https://bugzilla.altlinux.org/42240
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    load_helper epm-mark
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    epm_mark_auto "$PACKAGE"
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    # no check if we don't need a version
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    [ -n "$PACKAGEVERSION" ] || return 0
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    # check if we couldn't update and still need update
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    __epm_need_update $PACKAGE $PACKAGEVERSION || return 0
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    local textpackage
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    [ -n "$PACKAGEVERSION" ] && textpackage=" >= $PACKAGEVERSION"
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    warning "Can't assure in '$CMD' command from $PACKAGE$textpackage package"
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    return 1
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}
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