epm-assure

#!/bin/sh
#
# Copyright (C) 2013-2016  Etersoft
# Copyright (C) 2013-2016  Vitaly Lipatov <lav@etersoft.ru>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#

__check_command_in_path()
{
    PATH=$PATH:/sbin:/usr/sbin which "$1" 2>/dev/null
}


# copied from strings
# CHECKME: the same like estrlist has ?
# Note: used egrep! write '[0-9]+(first|two)', not '[0-9]\+...'
rhas()
{
	echo "$1" | grep -E -q -- "$2"
}

# copied from strings
is_dirpath()
{
    [ "$1" = "." ] && return $?
    rhas "$1" "/"
}

__epm_need_update()
{
    local PACKAGE="$1"
    local PACKAGEVERSION="$2"

    [ -n "$PACKAGEVERSION" ] || return 0

    load_helper epm-query
    is_installed "$PACKAGE" || return 0

    load_helper epm-print
    # epm print version for package N
    local INSTALLEDVERSION=$(query_package_field "version" "$PACKAGE")
    # if needed >= installed, return 0
    [ "$(compare_version "$PACKAGEVERSION" "$INSTALLEDVERSION")" -gt 0 ] && return 0

    return 1
}

__epm_assure_checking()
{
    local CMD="$1"
    local PACKAGE="$2"
    local PACKAGEVERSION="$3"

    [ -n "$PACKAGEVERSION" ] && return 1

    if is_dirpath "$CMD" ; then
        if [ -e "$CMD" ] ; then
            if [ -n "$verbose" ] ; then
                info "File or directory $CMD is already exists."
                epm qf "$CMD"
            fi
            return 0
        fi

        [ -n "$PACKAGE" ] || fatal "You need run with package name param when use with absolute path"
        return 1
    fi

    if __check_command_in_path "$CMD" >/dev/null ; then
        if [ -n "$verbose" ] ; then
            local compath="$(__check_command_in_path "$1")"
            info "Command $CMD is exists: $compath"
            epm qf "$compath"
        fi
        return 0
    fi

    return 1
}

# Do fast checking for command and install package if the command does not exist

# $1 - command name
# $2 - [package name]
# $3 - [needed package version]

__epm_assure()
{
    local CMD="$1"
    local PACKAGE="$2"
    local PACKAGEVERSION="$3"
    [ -n "$PACKAGE" ] || PACKAGE="$1"

    __epm_assure_checking $CMD $PACKAGE $PACKAGEVERSION && return 0

    info "Installing appropriate package for $CMD command..."
    __epm_need_update $PACKAGE $PACKAGEVERSION || return 0

    docmd epm --auto install $PACKAGE || return

    [ -n "$PACKAGEVERSION" ] || return 0
    # check if we couldn't update and still need update
    __epm_need_update $PACKAGE $PACKAGEVERSION && return 1
    return 0
}


epm_assure()
{
    [ -n "$pkg_filenames" ] || fatal "Assure: Missing params. Check $0 --help for info."

    # use helper func for extract separate params
    # shellcheck disable=SC2046
    __epm_assure $(eval echo $quoted_args)
}