[ci] nix: coverage script + gcovr package

ci/analyze-coverage.bash

+#!/usr/bin/env nix-shell
+#! nix-shell . -i bash -A test_deps_pinned
+set -eu
+
+echo "Prepare directories"
+rm -rf ./cover
+mkdir -p ./cover/tmp
+cd ./cover/tmp
+
+echo "Call gcov"
+gcov_files=$(find ../../build -name '*.gcda')
+for gcov_file in ${gcov_files[@]}; do
+    gcov ${gcov_file} 1>/dev/null 2>&1
+done
+
+echo "Only keep interesting files"
+interesting_sources=$(find ../../src -name '*.?pp' | sort | grep -v 'pempek_assert\|taywee_args')
+set +e
+for interesting_source in ${interesting_sources[@]}; do
+    interesting_file="./$(basename ${interesting_source}).gcov"
+    cp -f ${interesting_file} ../ 2>/dev/null
+done
+set -e
+
+cd ../..
+rm -rf ./cover/tmp
+
+echo "Run gcovr analysis (human-readable report)"
+gcovr -gk -o ./cover/summary.txt
+cat ./cover/summary.txt
+
+echo "Run gcovr analysis (html report)"
+rm -rf ./cover/html
+mkdir -p ./cover/html
+gcovr -gk --html-details -o ./cover/html/index.html
+
+exit 0

ci/default.nix

@@ -23,6 +23,7 @@ let
     });
     batsim_dev = kapack.batsim_dev;
     pytest = pkgs.python36Packages.pytest;
+    gcovr = kapack.gcovr;
 
     # Packages defined in this tree
     batsched_local = callPackage ./local.nix {};

ci/test-deps.nix

 { stdenv, batsim, batexpe,
-  which, redis, procps, psmisc, pytest,
+  which, redis, procps, psmisc, pytest, gcovr,
   nix-prefetch-git
 }:
 
@@ -10,7 +10,7 @@ stdenv.mkDerivation rec {
   unpackPhase = "true";
   installPhase = "true";
   propagatedBuildInputs = [ batsim batexpe
-    which redis procps psmisc pytest
+    which redis procps psmisc pytest gcovr
     nix-prefetch-git
   ];
 }