travis: use 'git fetch' to deepen, not 'git pull'

Travis builds of branches (i.e. pull-requests) were testing the wrong
thing, because the 'git pull' was causing current trunk to be
auto-merged. At least that's what seemed to break
https://travis-ci.org/tahoe-lafs/tahoe-lafs/jobs/81517826 : it hung
forever waiting for a commit message to be entered.

Also add "sudo: false" to use travis containers (faster) instead of new
VMs. We only use pip to install dependencies, not apt, so we don't need
root.

diff --git a/.travis.yml b/.travis.yml
index 484e502614f2b44bd63c19420dc105fcbbc89a1b..30e946b0708dd7ebe1b466149d6e16653823dc39 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,3 +1,4 @@
+sudo: false
 language: python
 python:
   - "2.7"
@@ -7,7 +8,7 @@ before_install:
   - sh -c set
   - git config --global user.email "travis-tahoe@tahoe-lafs.org"
   - git config --global user.name "Travis Tahoe"
-  - git pull --depth=1000
+  - git fetch --depth=1000
   - python misc/build_helpers/show-tool-versions.py
 install:
   - pip install 'coveralls==0.4.2'