Release and build a debian or ubuntu package using git-buildpackage and pbuilder

release.sh

#!/bin/bash
set -e

TAG="$1"
TIMESTAMP="$(date "+%Y%m%d.%H%M%S")"
BRANCH="$( git branch | awk '{ print $NF }' )"

## If this is a development build, then set tag depending on last tag +1
if [ "${BRANCH}" == "develop" ] ; then
    TAG="$( git tag -l |  tail -n 1 )1"
fi

## Check for tag
if [ "x$TAG" == "x" ] || [ -z "$TAG" ] ; then
   echo "Usage: $0 <tag>"
   exit 0
fi

## Set version depending on branch
export VERSION="${TAG}+${TIMESTAMP}"
if [ "${BRANCH}" == "develop" ] ; then
   export VERSION="${TAG}+${TIMESTAMP}-development"
fi

## Get all commits since last tag and adapt changelog accordingly
echo Updating changelog
git-dch --debian-tag="%(version)s" --new-version=$VERSION --debian-branch $BRANCH --release

## Put changelog in git
echo Committing changelog
git add debian/changelog
git commit -m "Annotate changelog"

## Create tag and push
echo Tagging current version
git tag $VERSION
git push
git push --tags

## Run a package build
echo Building package
git-buildpackage --git-pbuilder --git-dist=unstable --git-arch=amd64 --git-ignore-branch