Move the Travis "script" from .travis.yml to a separate file. (#747)

* Move the Travis "script" from .travis.yml to a separate file.

* Set -e -v.

* Replace "jdk_switcher use" as it would require sudo.

* Source jdk_switcher.sh on linux only.

2 files changed, 96 insertions, 0 deletions

diff --git a/scripts/check-git-history.py b/scripts/check-git-history.py
new file mode 100644
index 00000000..1aba2ca2
--- /dev/null
+++ b/scripts/check-git-history.py
@@ -0,0 +1,42 @@
+import os
+import sys
+import traceback
+
+def main(argv):
+  # Only check the history if the build is running on a pull request.
+  if is_travis_pull_request():
+    # This function assumes that HEAD^1 is the base branch and HEAD^2 is the
+    # pull request.
+    exit_if_pull_request_has_merge_commits()
+    print 'Checked pull request history: SUCCEEDED'
+  else:
+    print 'Skipped history check.'
+
+def is_travis_pull_request():
+  '''Returns true if TRAVIS_PULL_REQUEST is set to indicate a pull request.'''
+  return os.environ['TRAVIS_PULL_REQUEST'] != 'false'
+
+def exit_if_pull_request_has_merge_commits():
+  '''Exits with an error if any of the commits added by the pull request are
+     merge commits.'''
+  # Print the parents of each commit added by the pull request.
+  git_command = 'git log --format="%P" HEAD^1..HEAD^2'
+  for line in os.popen(git_command):
+    parents = line.split()
+    assert len(parents) >= 1, line
+    if len(parents) > 1:
+      print 'Pull request contains a merge commit:'
+      print_history()
+      print 'Checked pull request history: FAILED'
+      sys.exit(1)
+
+def print_history():
+  os.system('git log HEAD^1 HEAD^2 -30 --graph --oneline --decorate')
+
+def read_process(command):
+  '''Runs a command and returns everything printed to stdout.'''
+  with os.popen(command, 'r') as fd:
+    return fd.read()
+
+if __name__ == '__main__':
+  main(sys.argv)
diff --git a/scripts/travis_script b/scripts/travis_script
new file mode 100755
index 00000000..74b50bf0
--- /dev/null
+++ b/scripts/travis_script
@@ -0,0 +1,54 @@
+#!/bin/bash
+#
+# Travis build script, cf.
+# https://docs.travis-ci.com/user/customizing-the-build/#Implementing-Complex-Build-Steps.
+
+set -o errexit
+set -o xtrace
+
+case "$TASK" in
+  "CHECK_GIT_HISTORY")
+    python "$(dirname "$0")"/check-git-history.py
+    ;;
+  "BUILD")
+    case "$TRAVIS_OS_NAME" in
+      "linux")
+        source /opt/jdk_switcher/jdk_switcher.sh
+        export JAVA8_HOME="$(jdk_switcher home oraclejdk8)"
+        case "$TRAVIS_JDK_VERSION" in
+          "oraclejdk8")
+            export JAVA_HOMES="$(jdk_switcher home openjdk6)/jre:$(jdk_switcher home openjdk7)/jre:$(jdk_switcher home oraclejdk8)/jre:$(jdk_switcher home oraclejdk9)"
+            ./gradlew clean assemble --stacktrace
+            ./gradlew check :opencensus-all:jacocoTestReport
+            ;;
+          "openjdk7")
+            # "./gradlew classes testClasses" is a workaround for
+            # https://github.com/gradle/gradle/issues/2421.
+            # See https://github.com/gradle/gradle/issues/2421#issuecomment-319916874.
+            JAVA_HOME="$(jdk_switcher home openjdk8)" ./gradlew classes testClasses
+            ./gradlew clean assemble --stacktrace
+            ./gradlew check
+            ;;
+          *)
+            echo "Unknown JDK version $TRAVIS_JDK_VERSION"
+            exit 1
+            ;;
+        esac
+        ;;
+      "osx")
+        # OS X is a separate case, because the JDK version is determined by the OS X image:
+        # https://docs.travis-ci.com/user/reference/osx/#JDK-and-OS-X
+        ./gradlew clean assemble --stacktrace
+        ./gradlew check
+        ;;
+      *)
+        echo "Unknown OS name $TRAVIS_OS_NAME"
+        exit 1
+        ;;
+    esac
+    ;;
+  *)
+    echo "Unknown task $TASK"
+    exit 1
+    ;;
+esac