nix-tools/lib/util-pkg.sh

#!/bin/bash
#
# 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; version 2 of the License.
#
# 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.

# $1: sofile
# $2: soarch
process_sofile() {
    # extract the library name: libfoo.so
    local soname="${1%.so?(+(.+([0-9])))}".so
    # extract the major version: 1
    soversion="${1##*\.so\.}"
    if [[ "$soversion" = "$1" ]] && (($IGNORE_INTERNAL)); then
        continue
    fi
    if ! in_array "${soname}=${soversion}-$2" ${soobjects[@]}; then
    # libfoo.so=1-64
        msg "${soname}=${soversion}-$2"
        soobjects+=("${soname}=${soversion}-$2")
    fi
}

pkgver_equal() {
    if [[ $1 = *-* && $2 = *-* ]]; then
        # if both versions have a pkgrel, then they must be an exact match
        [[ $1 = "$2" ]]
    else
        # otherwise, trim any pkgrel and compare the bare version.
        [[ ${1%%-*} = "${2%%-*}" ]]
    fi
}

get_full_version() {
    # set defaults if they weren't specified in buildfile
    pkgbase=${pkgbase:-${pkgname[0]}}
    epoch=${epoch:-0}
    if [[ -z $1 ]]; then
        if [[ $epoch ]] && (( ! $epoch )); then
            echo $pkgver-$pkgrel
        else
            echo $epoch:$pkgver-$pkgrel
        fi
    else
        for i in pkgver pkgrel epoch; do
            local indirect="${i}_override"
            eval $(declare -f package_$1 | sed -n "s/\(^[[:space:]]*$i=\)/${i}_override=/p")
            [[ -z ${!indirect} ]] && eval ${indirect}=\"${!i}\"
        done
        if (( ! $epoch_override )); then
            echo $pkgver_override-$pkgrel_override
        else
            echo $epoch_override:$pkgver_override-$pkgrel_override
        fi
    fi
}

find_cached_package() {
    local searchdirs=("$PWD" "$PKGDEST") results=()
    local targetname=$1 targetver=$2 targetarch=$3
    local dir pkg pkgbasename name ver rel arch r results

    for dir in "${searchdirs[@]}"; do
        [[ -d $dir ]] || continue

        for pkg in "$dir"/*.pkg.tar.xz; do
            [[ -f $pkg ]] || continue

            # avoid adding duplicates of the same inode
            for r in "${results[@]}"; do
                [[ $r -ef $pkg ]] && continue 2
            done

            # split apart package filename into parts
            pkgbasename=${pkg##*/}
            pkgbasename=${pkgbasename%.pkg.tar?(.?z)}

            arch=${pkgbasename##*-}
            pkgbasename=${pkgbasename%-"$arch"}

            rel=${pkgbasename##*-}
            pkgbasename=${pkgbasename%-"$rel"}

            ver=${pkgbasename##*-}
            name=${pkgbasename%-"$ver"}

            if [[ $targetname = "$name" && $targetarch = "$arch" ]] &&
                pkgver_equal "$targetver" "$ver-$rel"; then
                results+=("$pkg")
            fi
        done
    done

    case ${#results[*]} in
        0)
        return 1
        ;;
        1)
        printf '%s\n' "$results"
        return 0
        ;;
        *)
        error 'Multiple packages found:'
        printf '\t%s\n' "${results[@]}" >&2
        return 1
        ;;
    esac
}