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path: root/scripts/libmakepkg/integrity/verify_checksum.sh.in
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#!/bin/bash
#
#   verify_checksum.sh - functions for checking source checksums
#
#   Copyright (c) 2014-2016 Pacman Development Team <pacman-dev@archlinux.org>
#
#   This program is free software; you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation; either version 2 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 General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

[[ -n "$LIBMAKEPKG_INTEGRITY_VERIFY_CHECKSUM_SH" ]] && return
LIBMAKEPKG_INTEGRITY_CHECKSUM_SH=1

LIBRARY=${LIBRARY:-'@libmakepkgdir@'}

source "$LIBRARY/util/message.sh"
source "$LIBRARY/util/pkgbuild.sh"

check_checksums() {
        local integ a
        declare -A correlation
        (( SKIPCHECKSUMS )) && return 0

        # Initialize a map which we'll use to verify that every source array has at
        # least some kind of checksum array associated with it.
        (( ${#source[*]} )) && correlation['source']=1
        case $1 in
                all)
                        for a in "${arch[@]}"; do
                                array_build _ source_"$a" && correlation["source_$a"]=1
                        done
                        ;;
                *)
                        array_build _ source_"$CARCH" && correlation["source_$CARCH"]=1
                        ;;
        esac

        for integ in "${known_hash_algos[@]}"; do
                verify_integrity_sums "$integ" && unset "correlation[source]"

                case $1 in
                        all)
                                for a in "${arch[@]}"; do
                                        verify_integrity_sums "$integ" "$a" && unset "correlation[source_$a]"
                                done
                                ;;
                        *)
                                verify_integrity_sums "$integ" "$CARCH" && unset "correlation[source_$CARCH]"
                                ;;
                esac
        done

        if (( ${#correlation[*]} )); then
                error "$(gettext "Integrity checks are missing for: %s")" "${!correlation[*]}"
                exit 1 # TODO: error code
        fi
}

verify_integrity_one() {
        local source_name=$1 integ=$2 expectedsum=$3

        local file="$(get_filename "$source_name")"
        printf '    %s ... ' "$file" >&2

        if [[ $expectedsum = 'SKIP' ]]; then
                printf '%s\n' "$(gettext "Skipped")" >&2
                return
        fi

        if ! file="$(get_filepath "$file")"; then
                printf '%s\n' "$(gettext "NOT FOUND")" >&2
                return 1
        fi

        local realsum="$(openssl dgst -${integ} "$file")"
        realsum="${realsum##* }"
        if [[ ${expectedsum,,} = "$realsum" ]]; then
                printf '%s\n' "$(gettext "Passed")" >&2
        else
                printf '%s\n' "$(gettext "FAILED")" >&2
                return 1
        fi

        return 0
}

verify_integrity_sums() {
        local integ=$1 arch=$2 integrity_sums=() sources=() srcname

        if [[ $arch ]]; then
                array_build integrity_sums "${integ}sums_$arch"
                srcname=source_$arch
        else
                array_build integrity_sums "${integ}sums"
                srcname=source
        fi

        array_build sources "$srcname"
        if (( ${#integrity_sums[@]} == 0 && ${#sources[@]} == 0 )); then
                return 1
        fi

        if (( ${#integrity_sums[@]} == ${#sources[@]} )); then
                msg "$(gettext "Validating %s files with %s...")" "$srcname" "${integ}sums"
                local idx errors=0
                for (( idx = 0; idx < ${#sources[*]}; idx++ )); do
                        verify_integrity_one "${sources[idx]}" "$integ" "${integrity_sums[idx]}" || errors=1
                done

                if (( errors )); then
                        error "$(gettext "One or more files did not pass the validity check!")"
                        exit 1 # TODO: error code
                fi
        elif (( ${#integrity_sums[@]} )); then
                error "$(gettext "Integrity checks (%s) differ in size from the source array.")" "$integ"
                exit 1 # TODO: error code
        else
                return 1
        fi
}