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Must signed.version be incremented every time a role is re-signed?

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python

调研方向

先查看所链接的 TUF 规范中的 timestamp 文件格式部分,然后比较 examples/repo_example/basic_repo.py 和所引用的 tuf/api/metadata.py 位置中对 signed.version 的处理。在决定措辞之前,先查看现有讨论。完成的标准是:文档明确说明重新签名何时需要递增版本,并包含所要求的已过期 timestamp 示例。

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描述

documentation repository

Description of issue or feature request:

After reading the TUF specification and studying the basic_repo.py example, one thing remains unclear to me:

When exactly do we need to increment signed.version?

It is clear that we need to increment the signed.version after e.g. adding a new target, as detailed in the basic_repo.py example.

However, what if we only modify signed.expires, after a role has expired, without changing anything else? Do we also need to increment signed.version in that case? That would imply e.g. the version of timestamp is incremented every time it is re-signed.

In general, do we need to increment a role's signed.version every time we re-sign that role, without exception?

Current behavior:

It is not explicitly clear from the documentation when signed.version needs to be incremented.

Expected behavior:

It would be very helpful if the documentation/specification could clarify this point explicitly.

Perhaps the basic_repo.py example could also show a snippet where an expired timestamp is re-signed (without any changes to the root, targets, or snapshot metadata).

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