#!/bin/bash

# This script generates the Debian package changelog file from the annotated
# tags doing back from the current HEAD.  If you update a debian package
# without changing the agent bundle, you should make an annotated tag of the
# form "<agent version>-deb<revision #> where <revision #> should start at 2
# (the first revision is implicitly set to 1 if there is no debian tag).

set -exuo pipefail

agent_version=$1
deb_revision=$2

git="git --git-dir /git-repo --bare"

# Construct the changelog from git annotated tags
dch --create --empty --package signalfx-agent -v 0.0.0-1

tag=v$agent_version
if (( $deb_revision > 1 )); then
  tag=$tag-deb${deb_revision}
fi

message="$($git tag -l --format='%(contents)' $tag)"
if [[ -z $message ]]; then
  message="Release of $tag"
fi

dch -v $agent_version-$deb_revision --distribution all "${message}"

cat debian/changelog