Linus Torvalds wrote:
Doing a "git diff" cannot actually update the index (since it very much has to work on a read-only setup too), which is why the index _stays_ stale unless something is done (eg "git status") to refresh it.
Another thought: How about if git-diff *tries* to update the index if needed, but failure to do so is not treated as an error condition? That seems like the best of both worlds to me: git would self-correct a potential performance problem without user intervention, while still working properly in a read-only environment.
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