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+# Library of functions shared by all CI scripts
+
+skip_branch_tip_with_tag () {
+ # Sometimes, a branch is pushed at the same time the tag that points
+ # at the same commit as the tip of the branch is pushed, and building
+ # both at the same time is a waste.
+ #
+ # When the build is triggered by a push to a tag, $CI_BRANCH will
+ # have that tagname, e.g. v2.14.0. Let's see if $CI_BRANCH is
+ # exactly at a tag, and if so, if it is different from $CI_BRANCH.
+ # That way, we can tell if we are building the tip of a branch that
+ # is tagged and we can skip the build because we won't be skipping a
+ # build of a tag.
+
+ if TAG=$(git describe --exact-match "$CI_BRANCH" 2>/dev/null) &&
+ test "$TAG" != "$CI_BRANCH"
+ then
+ echo "$(tput setaf 2)Tip of $CI_BRANCH is exactly at $TAG$(tput sgr0)"
+ exit 0
+ fi
+}
+
+# Save some info about the current commit's tree, so we can skip the build
+# job if we encounter the same tree again and can provide a useful info
+# message.
+save_good_tree () {
+ echo "$(git rev-parse $TRAVIS_COMMIT^{tree}) $TRAVIS_COMMIT $TRAVIS_JOB_NUMBER $TRAVIS_JOB_ID" >>"$good_trees_file"
+ # limit the file size
+ tail -1000 "$good_trees_file" >"$good_trees_file".tmp
+ mv "$good_trees_file".tmp "$good_trees_file"
+}
+
+# Skip the build job if the same tree has already been built and tested
+# successfully before (e.g. because the branch got rebased, changing only
+# the commit messages).
+skip_good_tree () {
+ if ! good_tree_info="$(grep "^$(git rev-parse $TRAVIS_COMMIT^{tree}) " "$good_trees_file")"
+ then
+ # Haven't seen this tree yet, or no cached good trees file yet.
+ # Continue the build job.
+ return
+ fi
+
+ echo "$good_tree_info" | {
+ read tree prev_good_commit prev_good_job_number prev_good_job_id
+
+ if test "$TRAVIS_JOB_ID" = "$prev_good_job_id"
+ then
+ cat <<-EOF
+ $(tput setaf 2)Skipping build job for commit $TRAVIS_COMMIT.$(tput sgr0)
+ This commit has already been built and tested successfully by this build job.
+ To force a re-build delete the branch's cache and then hit 'Restart job'.
+ EOF
+ else
+ cat <<-EOF
+ $(tput setaf 2)Skipping build job for commit $TRAVIS_COMMIT.$(tput sgr0)
+ This commit's tree has already been built and tested successfully in build job $prev_good_job_number for commit $prev_good_commit.
+ The log of that build job is available at https://travis-ci.org/$TRAVIS_REPO_SLUG/jobs/$prev_good_job_id
+ To force a re-build delete the branch's cache and then hit 'Restart job'.
+ EOF
+ fi
+ }
+
+ exit 0
+}
+
+check_unignored_build_artifacts ()
+{
+ ! git ls-files --other --exclude-standard --error-unmatch \
+ -- ':/*' 2>/dev/null ||
+ {
+ echo "$(tput setaf 1)error: found unignored build artifacts$(tput sgr0)"
+ false
+ }
+}
+
+# Set 'exit on error' for all CI scripts to let the caller know that
+# something went wrong.
+# Set tracing executed commands, primarily setting environment variables
+# and installing dependencies.
+set -ex
+
+# When building a PR, TRAVIS_BRANCH refers to the *target* branch. Not what we
+# want here. We want the source branch instead.
+CI_BRANCH="${TRAVIS_PULL_REQUEST_BRANCH:-$TRAVIS_BRANCH}"
+
+cache_dir="$HOME/travis-cache"
+good_trees_file="$cache_dir/good-trees"
+
+mkdir -p "$cache_dir"
+
+skip_branch_tip_with_tag
+skip_good_tree
+
+if test -z "$jobname"
+then
+ jobname="$TRAVIS_OS_NAME-$CC"
+fi
+
+export DEVELOPER=1
+export DEFAULT_TEST_TARGET=prove
+export GIT_PROVE_OPTS="--timer --jobs 3 --state=failed,slow,save"
+export GIT_TEST_OPTS="--verbose-log -x --immediate"
+export GIT_TEST_CLONE_2GB=YesPlease
+if [ "$jobname" = linux-gcc ]; then
+ export CC=gcc-8
+fi
+
+case "$jobname" in
+linux-clang|linux-gcc)
+ export GIT_TEST_HTTPD=YesPlease
+
+ # The Linux build installs the defined dependency versions below.
+ # The OS X build installs the latest available versions. Keep that
+ # in mind when you encounter a broken OS X build!
+ export LINUX_P4_VERSION="16.2"
+ export LINUX_GIT_LFS_VERSION="1.5.2"
+
+ P4_PATH="$HOME/custom/p4"
+ GIT_LFS_PATH="$HOME/custom/git-lfs"
+ export PATH="$GIT_LFS_PATH:$P4_PATH:$PATH"
+ ;;
+osx-clang|osx-gcc)
+ # t9810 occasionally fails on Travis CI OS X
+ # t9816 occasionally fails with "TAP out of sequence errors" on
+ # Travis CI OS X
+ export GIT_SKIP_TESTS="t9810 t9816"
+ ;;
+GIT_TEST_GETTEXT_POISON)
+ export GIT_TEST_GETTEXT_POISON=YesPlease
+ ;;
+esac