#!/bin/bash

if [ ! -z "$EMC2_HOME" ]; then
    source $EMC2_HOME/scripts/githelper.sh
else
    if [ ! -d debian -o ! -d src ]; then
        echo "this script must be run from the root of the source tree (the directory with debian and src in it)"
        exit 1
    fi
    source scripts/githelper.sh
fi

githelper $1

if [ "$DEB_COMPONENT" = "scratch" ]; then
    # unknown branches get the VERSION file, plus the branch name (with any
    # characters that are invalid in debian version numbers replaced with
    # dashes '-'), plus the HEAD commit SHA1
    echo v$(git show HEAD:VERSION | cut -d ' ' -f 1)~${GIT_BRANCH//[^-.+:~a-z0-9]/-}~$(git show --pretty=format:%h HEAD | head -1)
else
    # known branches get the "describe" of the most recent signed git tag,
    # or of the most recent unsigned tag if no signed tags are found
    git describe --match "$GIT_TAG"
fi