ci: Use ./ci/ on non-travis host

ci/test/03_before_install.sh

@@ -6,7 +6,6 @@
 
 export LC_ALL=C.UTF-8
 
-PATH=$(echo $PATH | tr ':' "\n" | sed '/\/opt\/python/d' | tr "\n" ":" | sed "s|::|:|g")
 # Add llvm-symbolizer directory to PATH. Needed to get symbolized stack traces from the sanitizers.
 PATH=$PATH:/usr/lib/llvm-6.0/bin/
 export PATH

ci/test/04_install.sh

@@ -6,13 +6,8 @@
 
 export LC_ALL=C.UTF-8
 
-free -m -h
-echo "Number of CPUs (nproc): $(nproc)"
-
 ccache echo "Creating ccache dir if it didn't already exist"
 
-${CI_RETRY_EXE} docker pull "$DOCKER_NAME_TAG"
-
 if [ ! -d ${DIR_QA_ASSETS} ]; then
   git clone https://github.com/bitcoin-core/qa-assets ${DIR_QA_ASSETS}
 fi
@@ -29,11 +24,25 @@ if [[ $HOST = *-mingw32 ]]; then
 elif [[ $BITCOIN_CONFIG = *--with-sanitizers=*address* ]]; then # If ran with (ASan + LSan), Docker needs access to ptrace (https://github.com/google/sanitizers/issues/764)
   DOCKER_ADMIN="--cap-add SYS_PTRACE"
 fi
-DOCKER_ID=$(docker run $DOCKER_ADMIN -idt --mount type=bind,src=$BASE_BUILD_DIR,dst=$BASE_BUILD_DIR --mount type=bind,src=$CCACHE_DIR,dst=$CCACHE_DIR -w $BASE_BUILD_DIR --env-file /tmp/env $DOCKER_NAME_TAG)
 
-DOCKER_EXEC () {
-  docker exec $DOCKER_ID bash -c "cd $PWD && $*"
-}
+if [ -z "$RUN_CI_ON_HOST" ]; then
+  echo "Creating $DOCKER_NAME_TAG container to run in"
+  ${CI_RETRY_EXE} docker pull "$DOCKER_NAME_TAG"
+
+  DOCKER_ID=$(docker run $DOCKER_ADMIN -idt --mount type=bind,src=$BASE_BUILD_DIR,dst=$BASE_BUILD_DIR --mount type=bind,src=$CCACHE_DIR,dst=$CCACHE_DIR -w $BASE_BUILD_DIR --env-file /tmp/env $DOCKER_NAME_TAG)
+
+  DOCKER_EXEC () {
+    docker exec $DOCKER_ID bash -c "cd $PWD && $*"
+  }
+else
+  echo "Running on host system without docker wrapper"
+  DOCKER_EXEC () {
+    bash -c "cd $PWD && $*"
+  }
+fi
+
+DOCKER_EXEC free -m -h
+DOCKER_EXEC echo "Number of CPUs \(nproc\): $(nproc)"
 
 ${CI_RETRY_EXE} DOCKER_EXEC apt-get update
 ${CI_RETRY_EXE} DOCKER_EXEC apt-get install --no-install-recommends --no-upgrade -qq $PACKAGES $DOCKER_PACKAGES