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rust: fix unsound `OwningDirstateMap` As per the previous patch, `OwningDirstateMap` is unsound. Self-referential structs are difficult to implement correctly in Rust since the compiler is free to move structs around as much as it wants to. They are also very rarely needed in practice, so the state-of-the-art on how they should be done within the Rust rules is still a bit new. The crate `ouroboros` is an attempt at providing a safe way (in the Rust sense) of declaring self-referential structs. It is getting a lot attention and was improved very quickly when soundness issues were found in the past: rather than relying on our own (limited) review circle, we might as well use the de-facto common crate to fix this problem. This will give us a much better chance of finding issues should any new ones be discovered as well as the benefit of fewer `unsafe` APIs of our own. I was starting to think about how I would present a safe API to the old struct but soon realized that the callback-based approach was already done in `ouroboros`, along with a lot more care towards refusing incorrect structs. In short: we don't return a mutable reference to the `DirstateMap` anymore, we expect users of its API to pass a `FnOnce` that takes the map as an argument. This allows our `OwningDirstateMap` to control the input and output lifetimes of the code that modifies it to prevent such issues. Changing to `ouroboros` meant changing every API with it, but it is relatively low churn in the end. It correctly identified the example buggy modification of `copy_map_insert` outlined in the previous patch as violating the borrow rules. Differential Revision: https://phab.mercurial-scm.org/D12429
author Raphaël Gomès <rgomes@octobus.net>
date Tue, 05 Apr 2022 10:55:28 +0200
parents ffd3e823a7e5
children
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*** Test in-uri schemes

CFG: {b'x.prefix': b'http://example.org'}
URI: http://example.org/foo
     ('x', 'x')
URI: http://example.org/foo/bar
     ('x', 'x')
URI: http://example.org/bar
     ('x', 'x')
URI: https://example.org/foo
     abort
URI: https://example.org/foo/bar
     abort
URI: https://example.org/bar
     abort
URI: https://x@example.org/bar
     abort
URI: https://y@example.org/bar
     abort
CFG: {b'x.prefix': b'https://example.org'}
URI: http://example.org/foo
     abort
URI: http://example.org/foo/bar
     abort
URI: http://example.org/bar
     abort
URI: https://example.org/foo
     ('x', 'x')
URI: https://example.org/foo/bar
     ('x', 'x')
URI: https://example.org/bar
     ('x', 'x')
URI: https://x@example.org/bar
     ('x', 'x')
URI: https://y@example.org/bar
     abort
CFG: {b'x.prefix': b'http://example.org', b'x.schemes': b'https'}
URI: http://example.org/foo
     ('x', 'x')
URI: http://example.org/foo/bar
     ('x', 'x')
URI: http://example.org/bar
     ('x', 'x')
URI: https://example.org/foo
     abort
URI: https://example.org/foo/bar
     abort
URI: https://example.org/bar
     abort
URI: https://x@example.org/bar
     abort
URI: https://y@example.org/bar
     abort
CFG: {b'x.prefix': b'https://example.org', b'x.schemes': b'http'}
URI: http://example.org/foo
     abort
URI: http://example.org/foo/bar
     abort
URI: http://example.org/bar
     abort
URI: https://example.org/foo
     ('x', 'x')
URI: https://example.org/foo/bar
     ('x', 'x')
URI: https://example.org/bar
     ('x', 'x')
URI: https://x@example.org/bar
     ('x', 'x')
URI: https://y@example.org/bar
     abort

*** Test separately configured schemes

CFG: {b'x.prefix': b'example.org', b'x.schemes': b'http'}
URI: http://example.org/foo
     ('x', 'x')
URI: http://example.org/foo/bar
     ('x', 'x')
URI: http://example.org/bar
     ('x', 'x')
URI: https://example.org/foo
     abort
URI: https://example.org/foo/bar
     abort
URI: https://example.org/bar
     abort
URI: https://x@example.org/bar
     abort
URI: https://y@example.org/bar
     abort
CFG: {b'x.prefix': b'example.org', b'x.schemes': b'https'}
URI: http://example.org/foo
     abort
URI: http://example.org/foo/bar
     abort
URI: http://example.org/bar
     abort
URI: https://example.org/foo
     ('x', 'x')
URI: https://example.org/foo/bar
     ('x', 'x')
URI: https://example.org/bar
     ('x', 'x')
URI: https://x@example.org/bar
     ('x', 'x')
URI: https://y@example.org/bar
     abort
CFG: {b'x.prefix': b'example.org', b'x.schemes': b'http https'}
URI: http://example.org/foo
     ('x', 'x')
URI: http://example.org/foo/bar
     ('x', 'x')
URI: http://example.org/bar
     ('x', 'x')
URI: https://example.org/foo
     ('x', 'x')
URI: https://example.org/foo/bar
     ('x', 'x')
URI: https://example.org/bar
     ('x', 'x')
URI: https://x@example.org/bar
     ('x', 'x')
URI: https://y@example.org/bar
     abort

*** Test prefix matching

CFG: {b'x.prefix': b'http://example.org/foo', b'y.prefix': b'http://example.org/bar'}
URI: http://example.org/foo
     ('x', 'x')
URI: http://example.org/foo/bar
     ('x', 'x')
URI: http://example.org/bar
     ('y', 'y')
URI: https://example.org/foo
     abort
URI: https://example.org/foo/bar
     abort
URI: https://example.org/bar
     abort
URI: https://x@example.org/bar
     abort
URI: https://y@example.org/bar
     abort
CFG: {b'x.prefix': b'http://example.org/foo', b'y.prefix': b'http://example.org/foo/bar'}
URI: http://example.org/foo
     ('x', 'x')
URI: http://example.org/foo/bar
     ('y', 'y')
URI: http://example.org/bar
     abort
URI: https://example.org/foo
     abort
URI: https://example.org/foo/bar
     abort
URI: https://example.org/bar
     abort
URI: https://x@example.org/bar
     abort
URI: https://y@example.org/bar
     abort
CFG: {b'x.prefix': b'*', b'y.prefix': b'https://example.org/bar'}
URI: http://example.org/foo
     abort
URI: http://example.org/foo/bar
     abort
URI: http://example.org/bar
     abort
URI: https://example.org/foo
     ('x', 'x')
URI: https://example.org/foo/bar
     ('x', 'x')
URI: https://example.org/bar
     ('y', 'y')
URI: https://x@example.org/bar
     ('x', 'x')
URI: https://y@example.org/bar
     ('y', 'y')

*** Test user matching

CFG: {b'x.password': b'xpassword', b'x.prefix': b'http://example.org/foo', b'x.username': None}
URI: http://y@example.org/foo
     ('y', 'xpassword')
CFG: {b'x.password': b'xpassword', b'x.prefix': b'http://example.org/foo', b'x.username': None, b'y.password': b'ypassword', b'y.prefix': b'http://example.org/foo', b'y.username': b'y'}
URI: http://y@example.org/foo
     ('y', 'ypassword')
CFG: {b'x.password': b'xpassword', b'x.prefix': b'http://example.org/foo/bar', b'x.username': None, b'y.password': b'ypassword', b'y.prefix': b'http://example.org/foo', b'y.username': b'y'}
URI: http://y@example.org/foo/bar
     ('y', 'xpassword')

*** Test user matching with name in prefix

CFG: {b'x.password': b'xpassword', b'x.prefix': b'https://example.org/foo', b'x.username': None, b'y.password': b'ypassword', b'y.prefix': b'http://y@example.org/foo', b'y.username': b'y'}
URI: http://y@example.org/foo
     ('y', 'ypassword')
CFG: {b'y.password': b'ypassword', b'y.prefix': b'http://z@example.org/foo', b'y.username': b'y'}
URI: http://y@example.org/foo
     abort
CFG: {b'y.password': b'ypassword', b'y.prefix': b'http://z@example.org/foo'}
URI: http://y@example.org/foo
     abort
CFG: {b'y.password': b'ypassword', b'y.prefix': b'http://y@example.org/foo', b'y.username': b'z'}
URI: http://y@example.org/foo
     abort
CFG: {b'y.password': b'ypassword', b'y.prefix': b'http://y@example.org/foo'}
URI: http://y@example.org/foo
     ('y', 'ypassword')
CFG: {b'y.password': b'ypassword', b'y.prefix': b'http://y@example.org/foo'}
URI: http://example.org/foo
     abort

*** Test urllib2 and urlutil.url

URIs: http://user@example.com:8080/foo http://example.com:8080/foo
('user', '')