commit 780b6e4f9246515652336e9dd6b377b48152a463
author George Burgess IV <gbiv@google.com> Mon Sep 21 12:56:44 2020 -0700
committer George Burgess <gbiv@chromium.org> Mon Sep 21 21:06:01 2020 +0000
tree d58b218731e7313b6ce8028af48400dc387b3fbf
parent 9ba2a4f453e3a5b5d35006e6bf72bc94b02fd5b0

llvm_tools: add a script to fetch uploaded versions of LLVM

Along with sdk tarballs, the SDK builder publishes manifest files
containing the versions of packages contained by a particular tarball.
This script is intended to extract these versions, so we can more
confidently answer the question "when did this LLVM change _actually_
take effect?"

Example usage:

```
[ub] /m/s/g/c/s/t/t/llvm_tools [ 10ms ] ~> ./fetch_cros_sdk_rolls.py
cros-sdk-2020.08.28.002952.tar.xz.Manifest: 11.0_pre394483_p20200618-r11
cros-sdk-2020.09.01.145913.tar.xz.Manifest: 11.0_pre394483_p20200618-r11
cros-sdk-2020.09.02.121932.tar.xz.Manifest: 11.0_pre394483_p20200618-r11
cros-sdk-2020.09.03.075651.tar.xz.Manifest: 11.0_pre394483_p20200618-r11
cros-sdk-2020.09.04.035039.tar.xz.Manifest: 11.0_pre394483_p20200618-r11
cros-sdk-2020.09.05.000203.tar.xz.Manifest: 11.0_pre394483_p20200618-r11
cros-sdk-2020.09.05.193017.tar.xz.Manifest: 11.0_pre394483_p20200618-r11
cros-sdk-2020.09.06.145537.tar.xz.Manifest: 11.0_pre394483_p20200618-r11
cros-sdk-2020.09.07.100426.tar.xz.Manifest: 11.0_pre394483_p20200618-r11
cros-sdk-2020.09.08.234732.tar.xz.Manifest: 11.0_pre394483_p20200618-r11
cros-sdk-2020.09.09.204657.tar.xz.Manifest: 11.0_pre394483_p20200618-r11
cros-sdk-2020.09.11.112254.tar.xz.Manifest: 11.0_pre399094_p20200824-r1
cros-sdk-2020.09.14.044644.tar.xz.Manifest: 11.0_pre399094_p20200824-r2
cros-sdk-2020.09.15.034200.tar.xz.Manifest: 11.0_pre399094_p20200824-r2
cros-sdk-2020.09.15.235650.tar.xz.Manifest: 11.0_pre399094_p20200824-r2
cros-sdk-2020.09.16.195018.tar.xz.Manifest: 11.0_pre399094_p20200824-r3
cros-sdk-2020.09.17.182131.tar.xz.Manifest: 11.0_pre399094_p20200824-r3
cros-sdk-2020.09.18.133717.tar.xz.Manifest: 11.0_pre399094_p20200824-r3
cros-sdk-2020.09.19.085133.tar.xz.Manifest: 11.0_pre399094_p20200824-r3
cros-sdk-2020.09.20.033151.tar.xz.Manifest: 11.0_pre399094_p20200824-r3
```

This is literally a trivial wrapper around 2 gsutil commands and very
lite JSON wrangling, so I didn't include a test. Happy to add one if
people feel strongly that it's necessary.

BUG=None
TEST=Ran the script

Change-Id: If22a5faf89e601709a3304473bab2dba71ccd64c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/2422663
Tested-by: George Burgess <gbiv@chromium.org>
Reviewed-by: Tiancong Wang <tcwang@google.com>