File: using-these

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#!/bin/bash
set -e
d="${0%/*}"
case "$d" in
    /*) ;;
    *) d="$PWD/$d" ;;
esac
: ${DGIT_VERSION:=$(
    exec 2>&1 # if we fail at this, use the error message as the version
    set -e
    cd "$d"
    printf "git:"
    git-describe --dirty=+ 2>/dev/null ||
    git rev-parse HEAD
)}
export DGIT_VERSION
PERLLIB=$d${PERLLIB:+:}${PERLLIB}
export PERLLIB
PATH=$d:$d/infra${PATH:+:}${PATH}
export PATH
exec "$@"