Query a server's Rapporteur (or other) revision and compare it to the local git revision

diff-to-release.sh

#!/bin/bash

set -e

status_url=$1
local_revision=$(git rev-parse HEAD)
printf "%40s %-20s\n" $local_revision "Local"

remote_revision=$(curl --compressed --get --silent "$status_url" | jq --compact-output --monochrome-output '.revision' | tr -d '"')
printf "%40s %-20s\n" $remote_revision "Remote"

if [ "$remote_revision" == "$local_revision" ]
then
  echo "Versions are identical. No difference."
else
  git l $remote_revision...$local_revision
fi

Called with:

diff-to-release.sh "https://my.server.url/status.json"