travis: Save cache when compilation took very long

.travis.yml

@@ -32,7 +32,8 @@ install:
 before_script:
   - set -o errexit; source .travis/test_05_before_script.sh
 script:
-  - if [ $SECONDS -gt 1200 ]; then set +o errexit; echo "Travis early exit to cache current state"; false; else set -o errexit; source .travis/test_06_script.sh; fi
+  - if [ $SECONDS -gt 1200 ]; then set +o errexit; echo "Travis early exit to cache current state"; false; else set -o errexit; source .travis/test_06_script_a.sh; fi
+  - if [ $SECONDS -gt 1500 ]; then set +o errexit; echo "Travis early exit to cache current state"; false; else set -o errexit; source .travis/test_06_script_b.sh; fi
 after_script:
   - echo $TRAVIS_COMMIT_RANGE
   - echo $TRAVIS_COMMIT_LOG

.travis/test_06_script_a.sh

@@ -47,18 +47,4 @@ BEGIN_FOLD build
 DOCKER_EXEC make $MAKEJOBS $GOAL || ( echo "Build failure. Verbose build follows." && DOCKER_EXEC make $GOAL V=1 ; false )
 END_FOLD
 
-if [ "$RUN_UNIT_TESTS" = "true" ]; then
+cd ${TRAVIS_BUILD_DIR} || (echo "could not enter travis build dir $TRAVIS_BUILD_DIR"; exit 1)
-  BEGIN_FOLD unit-tests
-  DOCKER_EXEC LD_LIBRARY_PATH=$TRAVIS_BUILD_DIR/depends/$HOST/lib make $MAKEJOBS check VERBOSE=1
-  END_FOLD
-fi
-
-if [ "$TRAVIS_EVENT_TYPE" = "cron" ]; then
-  extended="--extended --exclude feature_pruning"
-fi
-
-if [ "$RUN_FUNCTIONAL_TESTS" = "true" ]; then
-  BEGIN_FOLD functional-tests
-  DOCKER_EXEC test/functional/test_runner.py --ci --combinedlogslen=4000 --coverage --quiet --failfast ${extended}
-  END_FOLD
-fi

.travis/test_06_script_b.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+#
+# Copyright (c) 2018 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+export LC_ALL=C.UTF-8
+
+cd "build/bitcoin-$HOST" || (echo "could not enter distdir build/bitcoin-$HOST"; exit 1)
+
+if [ "$RUN_UNIT_TESTS" = "true" ]; then
+  BEGIN_FOLD unit-tests
+  DOCKER_EXEC LD_LIBRARY_PATH=$TRAVIS_BUILD_DIR/depends/$HOST/lib make $MAKEJOBS check VERBOSE=1
+  END_FOLD
+fi
+
+if [ "$TRAVIS_EVENT_TYPE" = "cron" ]; then
+  extended="--extended --exclude feature_pruning"
+fi
+
+if [ "$RUN_FUNCTIONAL_TESTS" = "true" ]; then
+  BEGIN_FOLD functional-tests
+  DOCKER_EXEC test/functional/test_runner.py --ci --combinedlogslen=4000 --coverage --quiet --failfast ${extended}
+  END_FOLD
+fi