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Auto merge of #33288 - cyplo:32834_retry_download, r=alexcrichton
Get a file during bootstrap to a temp location first.
When downloading a file in the bootstrap phase - get it to a temp
location first. Verify it there and only if downloaded properly move it
to the `cache` directory.
This should prevent `make` being stuck if the download was interrupted
or otherwise corrupted, as per discussion in #32834
The temporary files are deleted in case of an exception.
I was looking for some unit/integration tests around this and couldn't find any - presumably because this is being tested by just Travis launching it ? Let me know if it would be good to try to write tests around this. Thanks !
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