Add a Bazel test testing determinism of `bazel build //src:bazel`

  - Test if hash(bazel1) == hash(bazel2)

This ensure that the build of bazel is a fixed point.

Change-Id: I422dfc7ec5b95aa054a2677e59427cbd8cd4ef01
PiperOrigin-RevId: 166180529

3 files changed, 84 insertions, 1 deletions

diff --git a/src/test/shell/bazel/BUILD b/src/test/shell/bazel/BUILD
index 8203e3d36c..fdc493cfd5 100644
--- a/src/test/shell/bazel/BUILD
+++ b/src/test/shell/bazel/BUILD
@@ -452,6 +452,18 @@ sh_test(
 )
 
 sh_test(
+    name = "bazel_determinism_test",
+    timeout = "eternal",
+    srcs = ["bazel_determinism_test.sh"],
+    args = ["$(location //:bazel-distfile)"],
+    data = [
+        ":test-deps",
+        "//:bazel-distfile",
+    ],
+    tags = ["jdk8"],
+)
+
+sh_test(
     name = "rule_test_test",
     size = "medium",
     srcs = ["rule_test_test.sh"],
diff --git a/src/test/shell/bazel/bazel_determinism_test.sh b/src/test/shell/bazel/bazel_determinism_test.sh
new file mode 100644
index 0000000000..7de2205112
--- /dev/null
+++ b/src/test/shell/bazel/bazel_determinism_test.sh
@@ -0,0 +1,71 @@
+#!/bin/bash
+#
+# Copyright 2016 The Bazel Authors. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+#
+# Test that bootstrapping bazel is a fixed point
+#
+
+set -u
+DISTFILE=$(rlocation io_bazel/${1#./})
+shift 1
+
+if [ "${JAVA_VERSION:-}" == "1.7" ] ; then
+  echo "Warning: bootstrapping not tested for java 1.7"
+  exit 0
+fi
+
+# Load the test setup defined in the parent directory
+source $(rlocation io_bazel/src/test/shell/integration_test_setup.sh) \
+  || { echo "integration_test_setup.sh not found!" >&2; exit 1; }
+
+function hash_outputs() {
+  [ -n "${BAZEL_TEST_XTRACE:-}" ] && set +x  # Avoid garbage in the output
+  # runfiles/MANIFEST & runfiles_manifest contain absolute path, ignore.
+  # ar on OS-X is non-deterministic, ignore .a files.
+  for i in $(find bazel-bin/ -type f -a \! -name MANIFEST -a \! -name '*.runfiles_manifest' -a \! -name '*.a'); do
+    sha256sum $i
+  done
+  for i in $(find bazel-genfiles/ -type f); do
+    sha256sum $i
+  done
+  [ -n "${BAZEL_TEST_XTRACE:-}" ] && set -x
+}
+
+function get_outputs_sum() {
+  hash_outputs | sort -k 2
+}
+
+function test_determinism()  {
+    local olddir=$(pwd)
+    WRKDIR=$(mktemp -d ${TEST_TMPDIR}/bazelbootstrap.XXXXXXXX)
+    mkdir -p "${WRKDIR}" || fail "Could not create workdir"
+    trap "rm -rf \"$WRKDIR\"" EXIT
+    cd "${WRKDIR}" || fail "Could not change to work directory"
+    unzip -q ${DISTFILE}
+    # Compile bazel a first time
+    bazel build --nostamp src:bazel
+    cp bazel-bin/src/bazel bazel1
+    get_outputs_sum >"${TEST_TMPDIR}/sum1"
+    ./bazel1 clean --expunge
+    ./bazel1 build --nostamp src:bazel
+    get_outputs_sum >"${TEST_TMPDIR}/sum2"
+    if ! (diff -q "${TEST_TMPDIR}/sum1" "${TEST_TMPDIR}/sum2"); then
+      diff -U0 "${TEST_TMPDIR}/sum1" "${TEST_TMPDIR}/sum2" >$TEST_log
+      fail "Non deterministic outputs found!"
+    fi
+}
+
+run_suite "determinism test"
diff --git a/src/test/shell/testenv.sh b/src/test/shell/testenv.sh
index 7791a91c4e..1906811515 100755
--- a/src/test/shell/testenv.sh
+++ b/src/test/shell/testenv.sh
@@ -269,7 +269,7 @@ exit 1;
 # A uniform SHA-256 commands that works accross platform
 #
 case "${PLATFORM}" in
-  darwin)
+  darwin|freebsd)
     function sha256sum() {
       cat "$1" | shasum -a 256 | cut -f 1 -d " "
     }