source: autobuild/scripts/download @ 1157

#!/bin/sh
. scripts/common

download() {
    local file="$1"
    local url="$2"
    local ret
    if [[ -f $file ]]; then
        return 0
    fi
    begin "from $url"; {
        if type aria2c >/dev/null 2>/dev/null; then
            (
            builtin cd "$(dirname "$file")"
            aria2c -j 10 -s 10 -o "$(basename "$file.tmp")" "$url" && mv "$file.tmp" "$file"
            )
            ret=$?
        elif type wget >/dev/null 2>/dev/null; then
            wget -c -O "$file.tmp" "$url" && mv "$file.tmp" "$file"
            ret=$?
        else
            curl -C - -o "$file.tmp" "$url" && mv "$file.tmp" "$file"
            ret=$?
        fi
        rm -f "$file.tmp"
    };
    [[ $ret -eq 0 ]] && end || end "not found"
    
    return $ret
}

cleanup() {
    local file
    for file in "$sourceDir/"*.bz2 "$sourceDir/"*.zip; do
        if [[ -f $file && ! -s $file ]]; then
            rm -f "$file"
        fi
    done
    exit
}

download_x() {
    local filename=$1
    shift

    local url
    local ret=1
    begin "Downloading $filename"; {
        while [ $# -gt 0 ]; do
            url=$1
            shift
            if download "$sourceDir/$filename" $url; then
                ret=0
                break
            fi
        done
    };
    [[ $ret -eq 0 ]] && end "downloaded" || end "not found"
    return $ret
}

trap cleanup exit

phpFiles_foreach download_x