Add a gcov tox environment

.gitignore

@@ -1,9 +1,11 @@
-dumb-init
-dist/
 *.deb
 *.egg-info
-.tox
-build/
-__pycache__/
+*.gc*
+*.o
 *.py[cod]
 .cache
+.tox
+__pycache__/
+build/
+dist/
+dumb-init

ci/docker-tox

@@ -9,14 +9,12 @@ sed -E \
     -i /etc/apt/sources.list
 
 apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 0x5BB92C09DB82666C
-echo 'deb http://ppa.launchpad.net/fkrull/deadsnakes/ubuntu xenial main' >> /etc/apt/sources.list
+echo 'deb http://ppa.launchpad.net/deadsnakes/ppa/ubuntu xenial main' >> /etc/apt/sources.list
 
 apt-get update
 apt-get install -y --no-install-recommends \
     git \
-    python2.6-dev \
     python2.7-dev \
-    python3.5-dev \
     python3.6-dev
 
 # We cannot use the Ubuntu versions of tox or virtualenv:

ci/gcov-build

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+set -euo pipefail
+envbindir="$1"
+cc -c dumb-init.c -o dumb-init.o -g --coverage
+cc dumb-init.o -o "${envbindir}/dumb-init" -g --coverage

ci/gcov-report

@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+set -euo pipefail
+gcov -f dumb-init.c
+grep '#####' dumb-init.c.gcov | cut -d':' -f2 | xargs echo "Missing:"

tox.ini

@@ -1,12 +1,19 @@
 [tox]
-envlist = py26,py27,py35,py36
+envlist = py27,py36,gcov
 
 [testenv]
 deps = -r{toxinidir}/requirements-dev.txt
-passenv = HOME SSH_AUTH_SOCK USER
+passenv = SSH_AUTH_SOCK
 commands =
     python -m pytest
 
+[testenv:gcov]
+skip_install = True
+commands =
+    {toxinidir}/ci/gcov-build {envbindir}
+    {[testenv]commands}
+    {toxinidir}/ci/gcov-report
+
 [testenv:pre-commit]
 basepython = /usr/bin/python3.6
 commands = pre-commit {posargs:run --all-files}