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679bac4bf3
The fetch logic for the case where depth is set and revision is a SHA1 has several failure modes that are not handled well by the current logic. 1) 'git fetch <SHA1>' requires git version >= 1.8.3 2) 'git fetch <SHA1>' can be prevented by a configuration option on the server. 3) 'git fetch --depth=<N> <refspec>' can fail to contain a SHA1 specified by the manifest. Each of these cases cause infinite recursion when _RemoteFetch() tries to call itself with current_branch_only=False because current_branch_only is set to True when depth != None. To try to prevent the infinite recursion, we set self.clone_depth to None before the first retry of _RemoteFetch(). This will allow the Fetch to eventually succeed in the case where clone-depth is specified in the manifest. A user specified depth from the init command will still recurse infinitely. In addition, never try to fetch a SHA1 directly if the git version being used is not at least 1.8.3. Change-Id: I802fc17878c0929cfd63fff611633c1d3b54ecd3