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-rwxr-xr-xci/lib-travisci.sh23
1 files changed, 23 insertions, 0 deletions
diff --git a/ci/lib-travisci.sh b/ci/lib-travisci.sh
index 44d6ba2..9c4ae9b 100755
--- a/ci/lib-travisci.sh
+++ b/ci/lib-travisci.sh
@@ -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