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我有一组 linux 计算机（从这里开始的“节点”），我将它们称为网络的临时成员。这些节点是车载的，并且经常进出wifi覆盖范围。

当然，将单个脚本、程序或文件的更新推送到所有节点对我来说通常是有益的。我想出的是：

  1. 生成所有节点共享的密钥对
  2. 在我的工作站上使用包含安装路径的标头加密新文件版本。我的工作站当然有公钥。
  3. 将加密更新放在节点可访问的网络“暂存”文件夹中
  4. 当一个节点发现自己连接良好时，它会检查暂存文件夹。
  5. 如果有新文件，它们是：
    • 复制到节点
    • 解密
    • 检查完整性（“文件头看起来不错吗？”）
    • 移动到标题规定的位置

这是我的代码的简单版本。这是一个坏主意吗？有没有更优雅的方法来处理更新超级不稳定连接上的无人值守节点？

  #!/bin/bash
    #A method for autonomously retrieving distributed updates

    #The latest and greatest files are here:
    stageDir="/remoteDirectory/stage"
    #Files are initially moved to a quarantine area
    qDir="/localDirectory/quarantine"
    #If all went well, put a copy of the encrypted file here:
    aDir="/localDirectory/pulled"
    #generic extension for encrypted files "Secure Up Date"
    ext="sud"

    for file in "$stageDir"/*."$ext"; do    #For each "sud" file...
        fname=$(basename $file)
        if [ ! -f $aDir/$fname ]; then  #If this file has not already been worked on...
            cp "$file" "$qDir"/"$fname" #Move it to the quarantine directory
        else
            echo "$fname has already been pulled"   #Move along
        fi
    done

    if [ "$(ls $qDir)" ]; then  #If there's something to do (i.e. files in the directory)
        for file in "$qDir"/*."$ext"; do
            fname=$(basename $file)
            qPath="$qDir/$fname"
            untrusted="$qPath.untrusted"
            #Decrypt file
            gpg --output "$untrusted" --yes --passphrase "supersecretpassphrase" --decrypt "$qPath" #Say yes to overwriting
            headline=$(head -n 1 $untrusted)    #Get the header (which is the first line of the file)
            #Check to see if this is a valid file
            if [[ $headline == "#LOOKSGOOD:"* ]]; then  #All headers must start with "#LOOKSGOOD:" or something
                #Get install path
                installPath=$(echo $headline | cut -d ':' -f 2) #Get the stuff after the colon
                tail -n +2 $untrusted > $installPath    #Send everything but the header line to the install path
                #Clean up our working files
                rm $untrusted
                mv $qPath "$aDir/$fname"
                #Report what we did
                echo $headline
            else
                #trash the file if it's not a legit file
                echo "$fname is not a legit update...trashing it"
                rm "$qDir/$fname"*
            fi
        done
    fi
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