Perform a diff of the Shipcat region values between two Git branches: `Usage: shipcat-git-diff service branch1 branch2`

shipcat-git-diff

#!/bin/sh

function verifyService {
  local service=$1

  if [ ! -f "services/$service/shipcat.yml" ]; then
    echo "No such service $service"
    exit 1
  fi
}

function verifyBranch {
  local branch=$1
  local branchCommit=$(git rev-parse --verify --quiet $branch)

  if [ -z "$branchCommit" ]; then
    echo "No such branch $branch"
    exit 1
  fi
}

function writeValues {
  local branch=$1

  git checkout -q $branch
  regions=$(awk '/^regions:$/{flag=1;next}/^[^-]/{flag=0}flag' "services/$service/shipcat.yml" | sed "s/- //")

  mkdir $tempDir/$branch
  for region in $regions; do
    shipcat values $service -r $region > $tempDir/$branch/$region
  done
}

if [ "$#" -ne 3 ]; then
  echo "Usage: shipcat-git-diff service branch1 branch2"
  exit 1
fi

if [[ $(git diff --stat) != '' ]]; then
  echo "You currently have uncommitted work. Maybe use 'git stash' first?"
  exit 1
fi

service=$1
branch1=$2
branch2=$3

verifyService $service
verifyBranch $branch1
verifyBranch $branch2

if [ "$branch1" == "$branch2" ]; then
  echo "Two distinct branch names must be used."
  exit 1
fi

tempDir=`mktemp -d 2>/dev/null || mktemp -d -t 'mytmpdir'`

writeValues $branch1
writeValues $branch2

diff $tempDir/$branch1 $tempDir/$branch2 | sed "s~$tempDir/~~g"

rm -rf $tempDir

shipcat diff {service} --git is now a similar feature that can be used without kube access.