* Kokoro CI bots use git-sync-deps to get sources
Update git-sync-deps to reduce the amount of data downloaded on a first
checkout, while being able to checkout the specific commit specified in
the DEPS file.
Previously the CI bots would only clone --depth=1. But that's not
enough to check out a specific commit. So clone either blobless
or treeless. For a CI bot, treeless is preferable, because it
downloads the least data. For interactive use, blobless is better
because it prevents redundant downloads of tree data.
See
https://github.blog/2020-12-21-get-up-to-speed-with-partial-clone-and-shallow-clone/Fixes: #5028
* --treeless decays to blob:none when git is too old
* Pin googletest to an older version, to make bazel build work
This scripts fails to run in Python 2. For systems that have both
Python 2 and 3 installed, depending on your PATH the existing code may
or may not run. Explictly using Python 3 to avoid this.
This adds in a script for updating DEPS and another for pulling in the
specified versions in the DEPS file.
DEPS entries that are not part of the documented build processs are
removed. Using the documented cmake process with them made for a very
sad state of one's checkout. If this removal breaks workflows we can
revist this, since the state is saved in git.
DEPS are rolled forward, so that this is taking use to a known good
state. These look like scary big rolls, but in reality the bots and
most people are running near HEAD for external/, so this integration
should already have been tested.
Summary of DEPS roll:
+ Rolling 3 dependencies
+ Roll external/effcee/ 04b624799..b83b58d17 (14 commits)
+ Roll external/googletest/ 98a0d007d..2f42d769a (576 commits)
+ Roll external/re2/ 6cf8ccd82..848dfb7e1 (90 commits)
+ Created with:
+ roll-dep external/effcee external/googletest external/re2 external/spirv-headers
Fixes#2665
