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This new method is Reference.set_target() which in addition lets you specify what to use in the reflog.
We do not want this as it is riddled with race conditions.
Updating the target of a reference is not like setting a property. It involves appending to the reflog under the same lock, so we must do it all the same time. Thus setting the target becomes a function which takes the new target and what the use would like to add to the reflog.
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Following from the previous commits, make 'head' read-only and provide a method to update head while providing a message. The checkout() codepath which switches branches has been updated to provide a reflog entry which mimics git's.
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I realised that I never updated the references to the new method of updating. For now I've left
Reference.target=as a proxy for the method call, but eventually we might like to remove it completely. Not specifying a message for the reflog significantly reduces the usability of the tools, so we should not provide a way to update which does not expose the existence of the reflog update.We will also need to get rid of
Reference.log_append()as that is now done as part of the reference update (due to race conditions and correctness wrt locking) and you should never call it directly.