rustup.sh
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Running 2 instances of rustup in parallel can cause failures
As mentioned in https://github.com/brson/multirust/issues/76
Also seems to get rustup's files into a state where it needs manual intervention to work:
multirust: updating existing install for 'nightly'
rustup: rustup home dir exists at /home/buildbot_slave/.multirust/rustup but version file /home/buildbot_slave/.multirust/rustup/rustup-version does not.
rustup: this may be old rustup metadata, in which case it can be deleted.
rustup: this is very suspicous. aborting.