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travis-ci: skip a branch build if equal tag is present

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If we push a branch and a tag pointing to the HEAD of this branch,
then Travis CI would run the build twice. This wastes resources and
slows the testing.

Add a function to detect this situation and skip the build the branch
if appropriate. Invoke this function on every build.

Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Lars Schneider 2017-09-10 16:44:29 +02:00 committed by Junio C Hamano
parent 657343a602
commit 09f5e9746c
1 changed files with 23 additions and 0 deletions
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23
ci/lib-travisci.sh
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@ -1,5 +1,28 @@
# 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.
#
# Travis gives a tagname e.g. v2.14.0 in $TRAVIS_BRANCH when
# the build is triggered by a push to a tag. Let's see if
# $TRAVIS_BRANCH is exactly at a tag, and if so, if it is
# different from $TRAVIS_BRANCH. That way, we can tell if
# we are building the tip of a branch that is tagged and
# we can skip the build because we won't be skipping a build
# of a tag.
if TAG=$(git describe --exact-match "$TRAVIS_BRANCH" 2>/dev/null) &&
$TAG != $TRAVIS_BRANCH
then
echo "Tip of $TRAVIS_BRANCH is exactly at $TAG"
exit 0
fi
}
# Set 'exit on error' for all CI scripts to let the caller know that
# something went wrong
set -e
skip_branch_tip_with_tag