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Allow using `download-ci-llvm` from directories other than the root #79156

Merged

bors merged 1 commit into rust-lang:master from jyn514:relative-llvm

Nov 19, 2020

Commits on Nov 18, 2020

Allow using download-ci-llvm from directories other than the root

Previously, bootstrap.py would attempt to find the LLVM commit from
`src/llvm-project`. However, it assumed it was always being run from the
top-level directory, which isn't always the case.

Before:

```
downloading https://ci-artifacts.rust-lang.org/rustc-builds//rust-dev-nightly-x86_64-unknown-linux-gnu.tar.gz

curl: (22) The requested URL returned error: 404
failed to run: curl -# -y 30 -Y 10 --connect-timeout 30 --retry 3 -Sf -o /tmp/tmppyh4w8 https://ci-artifacts.rust-lang.org/rustc-builds//rust-dev-nightly-x86_64-unknown-linux-gnu.tar.gz
Build completed unsuccessfully in 0:00:02
```

After:

```
downloading https://ci-artifacts.rust-lang.org/rustc-builds/430feb24a46993e5073c1bb1b39da190d83fa2bf/rust-dev-nightly-x86_64-unknown-linux-gnu.tar.gz
 ###################################################################################################################################################################### 100.0%
extracting /home/joshua/rustc/src/bootstrap/build/cache/llvm-430feb24a46993e5073c1bb1b39da190d83fa2bf-False/rust-dev-nightly-x86_64-unknown-linux-gnu.tar.gz
```

jyn514 committed Nov 18, 2020