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## Summary When we unzip wheels in the cache, we write the directories out to an `archive-v0` bucket, and then symlink into that bucket from the `wheels-v0` and `built-wheels-v0` buckets. On Windows, symlinks are not well supported. Specifically, they need to be explicitly enabled by the user. So, instead of symlinks, we now use junctions, which are well-supported on Windows, and allow you to (effectively) symlink a directory to another directory. This PR implements said junction support, which gets the core installer working on Windows. In the past, we also used symlinks to implement another primitive: we wanted to be able to replace a directory "atomically" (I put "atomically" in quotes because I don't know if it's actually a guaranteed atomic operation), in case someone was trying to use the directory while we were replacing it (as opposed to deleting the directory, then moving it into place). On Windows, it doesn't appear to be possible to atomically replace a junction. So instead, I'm using a new design, whereby the cache always returns canonicalized paths. We know these canonicalized paths are unique and won't be replaced, so they're safe for writers to rely on. In general, when we write new data to the cache, we now return the canonicalized path. When we read from the cache, and try to identify (e.g.) the set of wheels available to us, we canonicalize the links immediately and consider them non-existent if that operation fails. Closes #1085. --------- Co-authored-by: konstin <konstin@mailbox.org> |
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