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#!/bin/bash
#   repo-add : add a package to a given repo database file
#  
#   Copyright (c) 2006 Aaron Griffin <aaron@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, write to the Free Software
#   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 
#   USA.

FORCE=0
REPO_DB_FILE=""

DB_COMPRESSION="gz" #TODO this is gross
DB_CHECKSUMS=(md5)
TMP_DIR=""

if [ $# -lt 2 ]; then
    echo "repo-add /path/to/repo.db.tar.gz [--force] [packages-to-add]"
    exit 1
fi


get_checksum () {
    case "$(echo "$1" | tr A-Z a-z)" in
        md5) sum=$(md5sum $2); echo ${sum% *} ;;
        sha1) sum=$(sha1sum $2); echo ${sum% *} ;;
        sha256) sum=$(sha256sum $2); echo ${sum% *} ;;
        sha384) sum=$(sha256sum $2); echo ${sum% *} ;;
        sha512) sum=$(sha256sum $2); echo ${sum% *} ;;
    esac
}

checksum_name () {
    case "$(echo "$1" | tr A-Z a-z)" in
        md5) echo "MD5SUM" ;;
        sha1) echo "SHA1SUM" ;;
        sha256) echo "SHA256SUM" ;;
        sha384) echo "SHA384SUM" ;;
        sha512) echo "SHA512SUM" ;;
    esac
}

test_repo_db_file () {
    if [ -f "$REPO_DB_FILE" ]; then
        [ "$(tar tf "$REPO_DB_FILE" | grep -c "/desc")" -gt 0 ] || return 1
    else
        true
    fi
}

db_write_entry()
{
    pkgfile=$(readlink -f $1)
    export pkgname=""
    pkgver=""
    pkgdesc=""
    url=""
    builddate=""
    packager=""
    csize=""
    size="" 
    groups=""
    depends=""
    backups=""
    licenses=""
    _replaces=""
    _provides=""
    _conflicts=""

    OLDIFS="$IFS"
    #gross... IFS == new line
    IFS='
'
    for i in $(tar xOf "$pkgfile" .PKGINFO | grep -v "^#" |sed 's|\(\w*\)\s*=\s*\(.*\)|\1="\2"|'); do
        eval "${i}"
        case "$i" in
            group=*) groups="$groups $group" ;;
            depend=*) depends="$depends $depend" ;;
            backup=*) backups="$backups $backup" ;;
            license=*) licenses="$licenses $license" ;;
            replaces=*) _replaces="$_replaces $replaces" ;;
            provides=*) _provides="$_provides $provides" ;;
            conflicts=*) _conflicts="$_conflicts $conflicts" ;;
        esac
    done
    IFS=$OLDIFS

    csize="$(du -b $pkgfile | cut -f1)"

    cd $gstmpdir

    if [ -z "$pkgname" -o -z "$pkgver" ]; then
        echo "   error: invalid package file"
        return 1
    fi 

    if [ ! -d "$pkgname-$pkgver" ]; then
        [ -e "$pkgname-$pkgver" ] && rm -rf "$pkgname-$pkgver"
        mkdir "$pkgname-$pkgver"
        cd "$pkgname-$pkgver"
    else
        cd "$pkgname-$pkgver"
        [ -e desc ] && rm desc
        [ -e depends ] && rm depends
    fi

    # desc
    echo ":: creating 'desc' db entry"
    echo -e "%FILENAME%\n$1\n" >> desc
    echo -e "%NAME%\n$pkgname\n" >>desc
    echo -e "%VERSION%\n$pkgver\n" >>desc
    if [ -n "$pkgdesc" ]; then
        echo -e "%DESC%\n$pkgdesc\n" >>desc
    fi
    if [ -n "$groups" ]; then
        echo "%GROUPS%" >>desc
        echo $groups | tr -s ' ' '\n' >>desc
        echo "" >desc
    fi
    [ -n $csize ] && echo -e "%CSIZE%\n$csize\n" >>desc
    #TODO SIZE ? USIZE ?
    [ -n $size ] && echo -e "%USIZE%\n$size\n" >>desc

    for chk in ${DB_CHECKSUMS[@]}; do
        name="$(checksum_name $chk)"
        echo ":: computing $name checksums"
        if [ -n "$name" ]; then
            echo -e "%$name%\n$(get_checksum $chk $pkgfile)\n" >>desc
        fi
    done

    [ -n "$url" ] && echo -e "%URL%\n$url\n" >>desc
    if [ -n "$licenses" ]; then
        echo "%LICENSE%" >>desc
        echo $licenses | tr -s ' ' '\n' >>desc
        echo "" >>desc
    fi
    [ -n "$arch" ] && echo -e "%ARCH%\n$arch\n" >>desc
    [ -n "$builddate" ] && echo -e "%BUILDDATE%\n$builddate\n" >>desc
    [ -n "$packager" ] && echo -e "%PACKAGER%\n$packager\n" >>desc

    if [ -n "$_replaces" ]; then
        echo "%REPLACES%" >>desc
        echo $_replaces | tr -s ' ' '\n' >>desc
        echo "" >>desc
    fi
    [ "$FORCE" = "1" ] && echo -e "%FORCE%\n" >>desc

    # depends
    echo ":: creating 'depends' db entry"
    if [ -n "$depends" ]; then
        echo "%DEPENDS%" >>depends
        echo $depends | tr -s ' ' '\n' >>depends
        echo "" >>depends
    fi
    if [ -n "$_conflicts" ]; then
        echo "%CONFLICTS%" >>depends
        echo $_conflicts | tr -s ' ' '\n' >>depends
        echo "" >>depends
    fi
    if [ -n "$_provides" ]; then
        echo "%PROVIDES%" >>depends
        echo $_provides | tr -s ' ' '\n' >>depends
        echo "" >>depends
    fi

    # preserve the modification time
    touch -r "$pkgfile" desc depends
}
            
if [ $# -gt 1 ]; then
    gstmpdir=$(mktemp -d /tmp/gensync.XXXXXXXXXX) || (\
        echo "cannot create temp directory for database building"; \
        exit 1)

    success=0
    for arg in $@; do
        if [ "$arg" == "--force" -o "$arg" == "-f" ]; then
            FORCE=1
        elif [ "x$REPO_DB_FILE" == "x" ]; then
            REPO_DB_FILE="$(readlink -f $arg)"
            if ! test_repo_db_file; then
                echo "   repository db file '$REPO_DB_FILE' is not a proper pacman db"
                exit 1
            elif [ -f "$REPO_DB_FILE" ]; then
                echo ":: extracting database to a temporary location"
                tar xf "$REPO_DB_FILE" -C "$gstmpdir"
            fi
        else
            if [ -f "$arg" ]; then
                if ! tar xf "$arg" .PKGINFO 2>&1 >/dev/null; then
                    echo "error: '$arg' is not a package file, skipping"
                else
                    echo ":: adding package '$arg'"

                    this_dir="$(pwd)"
                    if db_write_entry "$arg"; then
                        success=1
                    fi
                    cd $this_dir
                fi
            else
                echo "error: package '$arg' not found"
            fi
        fi
    done

    if [ "$success" = "1" ]; then
        echo ":: creating updated database file ${REPO_DB_FILE}"
        cd $gstmpdir
        if [ -n "$(ls)" ]; then
            [ -f "${REPO_DB_FILE}.old" ] && rm "${REPO_DB_FILE}.old"
            [ -f "$REPO_DB_FILE" ] && mv "$REPO_DB_FILE" "${REPO_DB_FILE}.old"
            case "$DB_COMPRESSION" in
                gz) tar c * | gzip -9 >$REPO_DB_FILE ;;
                bz2) tar c * | bzip2 -9 >$REPO_DB_FILE ;;
                *) echo "warning: no compression set"
                tar c * >$REPO_DB_FILE;;
            esac
        fi
    else
        echo ":: no packages modified, nothing to do"
    fi
fi

[ -d "$gstmpdir" ] && rm -rf $gstmpdir