Merge #18569: ci: Add big endian native s390x build

6136a96cdf631f824fb89cf2720422787439acc9 ci: Rename RUN_CI_ON_HOST to DANGER_RUN_CI_ON_HOST (Hennadii Stepanov)
97ba77aa8e58c3c7ff767e6ca804d0e46370e5dc ci: Add native s390x (Hennadii Stepanov)

Pull request description:

  Unlike the Docker wrapped solution (#17591) this PR suggests running on host system directly.

  This approach makes builds quick and stable (see: #18106).

  The excerpt from the Travis log:
  ```
  ...
  Running on host system without docker wrapper
  ...
  Byte Order: Big Endian
  ...
  ```

ACKs for top commit:
  MarcoFalke:
    ACK 6136a96cdf631f824fb89cf2720422787439acc9

Tree-SHA512: 1b591de13e38d10a35217e1de11cbd648a359d18d16eed166fac18ea5788b58cc9fc6d407086ed342b99e57e479efd951a0ea693710177e500eb116316b9a788

3 files changed, 18 insertions, 4 deletions

diff --git a/ci/test/00_setup_env_mac_host.sh b/ci/test/00_setup_env_mac_host.sh
index 5753c3af31..a90d83734e 100644
--- a/ci/test/00_setup_env_mac_host.sh
+++ b/ci/test/00_setup_env_mac_host.sh
@@ -8,7 +8,6 @@ export LC_ALL=C.UTF-8
 
 export HOST=x86_64-apple-darwin16
 export PIP_PACKAGES="zmq"
-export RUN_CI_ON_HOST=true
 export RUN_UNIT_TESTS=true
 export RUN_FUNCTIONAL_TESTS=false
 export GOAL="install"
diff --git a/ci/test/00_setup_env_s390x_host.sh b/ci/test/00_setup_env_s390x_host.sh
new file mode 100644
index 0000000000..8f3063604e
--- /dev/null
+++ b/ci/test/00_setup_env_s390x_host.sh
@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+#
+# Copyright (c) 2019 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
+
+export HOST=s390x-linux-gnu
+export NO_DEPENDS=1
+export BITCOIN_CONFIG="--with-incompatible-bdb --enable-reduce-exports"
+export RUN_UNIT_TESTS=true
+export RUN_FUNCTIONAL_TESTS=true
+export GOAL="install"
diff --git a/ci/test/04_install.sh b/ci/test/04_install.sh
index acf7eeb920..3cfaf77fde 100755
--- a/ci/test/04_install.sh
+++ b/ci/test/04_install.sh
@@ -35,7 +35,7 @@ fi
 
 export P_CI_DIR="$PWD"
 
-if [ -z "$RUN_CI_ON_HOST" ]; then
+if [ -z "$DANGER_RUN_CI_ON_HOST" ]; then
   echo "Creating $DOCKER_NAME_TAG container to run in"
   ${CI_RETRY_EXE} docker pull "$DOCKER_NAME_TAG"
 
@@ -66,7 +66,7 @@ fi
 if [[ $DOCKER_NAME_TAG == centos* ]]; then
   ${CI_RETRY_EXE} DOCKER_EXEC yum -y install epel-release
   ${CI_RETRY_EXE} DOCKER_EXEC yum -y install $DOCKER_PACKAGES $PACKAGES
-elif [ "$TRAVIS_OS_NAME" != "osx" ]; then
+elif [ "$CI_USE_APT_INSTALL" != "no" ]; then
   ${CI_RETRY_EXE} DOCKER_EXEC apt-get update
   ${CI_RETRY_EXE} DOCKER_EXEC apt-get install --no-install-recommends --no-upgrade -y $PACKAGES $DOCKER_PACKAGES
 fi
@@ -77,6 +77,7 @@ if [ "$TRAVIS_OS_NAME" == "osx" ]; then
 else
   DOCKER_EXEC free -m -h
   DOCKER_EXEC echo "Number of CPUs \(nproc\):" \$\(nproc\)
+  DOCKER_EXEC echo $(lscpu | grep Endian)
   DOCKER_EXEC echo "Free disk space:"
   DOCKER_EXEC df -h
 fi
@@ -90,7 +91,7 @@ export DIR_FUZZ_IN=${DIR_QA_ASSETS}/fuzz_seed_corpus/
 
 DOCKER_EXEC mkdir -p "${BASE_SCRATCH_DIR}/sanitizer-output/"
 
-if [ -z "$RUN_CI_ON_HOST" ]; then
+if [ -z "$DANGER_RUN_CI_ON_HOST" ]; then
   echo "Create $BASE_ROOT_DIR"
   DOCKER_EXEC rsync -a /ro_base/ $BASE_ROOT_DIR
 fi