dctlenv/libexec/dctlenv-version

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Bash
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#!/usr/bin/env bash
set -uo pipefail
version="0.0.2"
git_revision=""
if cd "${BASH_SOURCE%/*}" 2>/dev/null && git remote -v 2>/dev/null | grep -q dctlenv; then
git_revision="$(git describe --tags HEAD 2>/dev/null || true)"
git_revision="${git_revision#v}"
fi
echo "dctlenv ${git_revision:-$version}"