[python-committers] Travis CI build on python/cpython passes in error

[Victor Stinner]

The Travis CI config runs the command:

git diff --name-only
49f6449ef4b81537c19b82329caaf60596c516c2...d0c822cded495409b68432fa10f9573417ca1fb7

Git fails with "fatal: Invalid symmetric difference expression (...)"
if it doesn't know one or both sha1.

The first problem is that 49f6449ef4b81537c19b82329caaf60596c516c2 is
"old" (Date: Sun Jul 16 07:29:16 2017), whereas Travis CI only gets
the 50 latest commits:

git clone --depth=50 https://github.com/python/cpython.git python/cpython

I tested: 50 is not enough to get this commit.

haypo at selma$ git clone --depth=50
https://github.com/python/cpython.git python/cpython
haypo at selma$ cd python/cpython/
haypo at selma$ git show 49f6449ef4b81537c19b82329caaf60596c516c2
fatal: bad object 49f6449ef4b81537c19b82329caaf60596c516c2

If "git diff" fails, we should simply run all tests.

Victor