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Saeed
Asked: 2021-08-02 05:02:09 +0800 CST

在 Ubuntu 中提取对无关用户的更改后的文件所有者

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这是我的拓扑：

My laptop ==> Ubuntu Desktop
| | |
User: root & saeed

My server ==> Ubuntu 20.04
| | |
Users: root & ubuntu (I deleted it as I explain below)

步骤：

  1. 我tar zvcf back.tar.gz .在笔记本电脑上运行用户saeed并创建文件。
  2. root我通过使用路径示例/home/test中的用户（不是任何用户的主目录）通过 SFTP 将此文件上传到我的服务器。
  3. 我提取back.tar.gz但/home/test我看到所有文件和目录的所有者都是ubuntu:ubuntu.
  4. 我删除ubuntu了用户并尝试了第三步，但得到了相同的结果。
  5. 我在我的笔记本电脑中提取back.tar.gz了另一个路径，但所有文件的所有者都是saeed:saeed.

为什么会这样？

linux ubuntu

1 个回答

  1. Best Answer

    以 root 身份提取时，tar默认情况下会保留原始所有者 ID。用户saeed恰好与另一台计算机上的 ID 相同ubuntu（可能是1000）。您可以通过运行来检查 ID id saeed，或者只是id检查当前用户。

    如果您不想保留用户 ID，请不要以 root 身份提取或使用该--no-same-owner选项。手册中的相关片段：

           --no-same-owner
              Extract files as yourself (default for ordinary users).

    对于使用--same-owner.

    --owner创建存档时--owner-map可以使用的相关选项：

           --owner=NAME[:UID]
              Force NAME as owner for added files.  If UID is not
              supplied, NAME can be either a user name or numeric UID.
              In this case the missing part (UID or name) will be
              inferred from the current host's user database.

              When used with --owner-map=FILE, affects only those files
              whose owner is not listed in FILE.

       --owner-map=FILE
              Read owner translation map from FILE.  Empty lines are
              ignored.  Comments are introduced with # sign and extend
              to the end of line.  Each non-empty line in FILE defines
              translation for a single UID.  It must consist of two
              fields, delimited by any amount of whitespace:

              OLDUSR NEWUSR[:NEWUID]

              OLDUSR is either a valid user name or a UID prefixed with
              +.  Unless NEWUID is supplied, NEWUSR must also be either
              a valid user name or a +UID.  Otherwise, both NEWUSR and
              NEWUID need not be listed in the system user database.

              As a result, each input file owned by OLDUSR will be
              stored in archive with owner name NEWUSR and UID NEWUID.
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