travis-ci: skip a branch build if equal tag is present
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>
Lars Schneider committed
Sep 10, 2017 at 16:44 UTC
09f5e9746ce8be640683f9f5f1ffb54a34d4dc90
1 file changed
+23
ci/lib-travisci.sh
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@@ -1,5 +1,28 @@
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# Library of functions shared by all CI scripts
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+skip_branch_tip_with_tag () {
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+ # Sometimes, a branch is pushed at the same time the tag that points
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+ # at the same commit as the tip of the branch is pushed, and building
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+ # both at the same time is a waste.
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+ #
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+ # Travis gives a tagname e.g. v2.14.0 in $TRAVIS_BRANCH when
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+ # the build is triggered by a push to a tag. Let's see if
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+ # $TRAVIS_BRANCH is exactly at a tag, and if so, if it is
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+ # different from $TRAVIS_BRANCH. That way, we can tell if
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+ # we are building the tip of a branch that is tagged and
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+ # we can skip the build because we won't be skipping a build
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+ # of a tag.
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+
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+ if TAG=$(git describe --exact-match "$TRAVIS_BRANCH" 2>/dev/null) &&
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+ $TAG != $TRAVIS_BRANCH
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+ then
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+ echo "Tip of $TRAVIS_BRANCH is exactly at $TAG"
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+ exit 0
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+ fi
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+}
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+
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# Set 'exit on error' for all CI scripts to let the caller know that
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# something went wrong
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set -e
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+
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+skip_branch_tip_with_tag