dex/git-version

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#!/bin/bash -e
# pull the current git commit hash
COMMIT=`git rev-parse HEAD`
# check if the current commit has a matching tag
TAG=$(git describe --exact-match --abbrev=0 --tags ${COMMIT} 2> /dev/null || true)
# use the matching tag as the version, if available
if [ -z "$TAG" ]; then
VERSION=$COMMIT
else
VERSION=$TAG
fi
# check for changed files (not untracked files)
if [ -n "$(git diff --shortstat 2> /dev/null | tail -n1)" ]; then
VERSION="${VERSION}+dirty"
fi
echo $VERSION