File: detect

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#!/usr/bin/env bash

usage() {
  echo "./detect channel"
  exit 1
}

if [ "$#" == 0 ]; then
  usage
fi

channel=$1
suffix=""

if [ "$channel" == "mainline" ]; then
  channel=""
fi

if [ ! -z "$channel" ]; then
  suffix="-$channel"
fi

name=$(git describe --always --tags --match "dockerfile/[0-9]*$suffix")

if [[ ! "$name" =~ "dockerfile" ]]; then
  name=${name}$suffix
fi

echo -n $name