A script to merge the variables for two environments in an Azure DevOps release pipeline.

ado_merger_release_env_vars.sh

#!/usr/bin/env bash
set -e

#Check Arguments
if [ $# -lt 3 ]; then
    echo "Insuffecient arguments supplied.  Shoudl be: ado_copy_relase_vars.sh src dest RELEASE_ID"
    exit 1
fi
SOURCE_ENV=$1
DEST_ENV=$2
RELEASE_ID=$3
GET_URI="https://vsrm.dev.azure.com/[ORG]/[PROJECT]/_apis/release/definitions/$RELEASE_ID"
PUT_URI="https://vsrm.dev.azure.com/[ORG]/[PROJECT]/_apis/release/definitions?api-version=6.0"

echo "Attemping to merge variables from $SOURCE_ENV to $DEST_ENV on Release $RELEASE_ID"

#Get Personal Access Token
echo -n "PAT: "
read -s PAT
echo
if [ -z "$PAT" ]; then
    echo "Please provide a personal access token"
    exit 1
fi
echo "Checking PAT..."
RETURN_CODE=$(curl -s -L --user ":$PAT" -o /dev/null -w "%{http_code}" $GET_URI)
if [ $RETURN_CODE -eq 400 ]; then
    echo "Invalid Release ID"
    echo "Exiting..."
    exit 1
fi
if [ $RETURN_CODE -eq 404 ]; then
    echo "Release ID does not exist"
    echo "Exiting..."
    exit 1
fi
if [ $RETURN_CODE -ne 200 ]; then
    echo "Invalid PAT"
    echo "Exiting..."
    exit 1
fi

#Check environments exist
echo "Getting existing release..."
CURRENT_RELEASE=$(curl -s -L --user ":$PAT" $GET_URI)
if [ -z "$CURRENT_RELEASE" ]; then
    echo "No release found for $RELEASE_ID"
    exit 1
fi
SOURCE_VARS=$(echo $CURRENT_RELEASE | jq --arg env "$SOURCE_ENV" '.environments[] | select(.name==$env) | .variables')
if [ -z "$SOURCE_VARS" ]; then
    echo "Source environment doesn't exist"
    exit 1
fi
DEST_VARS=$(echo $CURRENT_RELEASE | jq --arg env "$DEST_ENV" '.environments[] | select(.name==$env) | .variables')
if [ -z "$DEST_VARS" ]; then
    echo "Destination environment doesn't exist"
    exit 1
fi

#Merge two environments
MERGED_VARIABLES=$(echo $SOURCE_VARS $DEST_VARS | jq -s '.[0] * .[1]')
NEW_ENV=$(echo $CURRENT_RELEASE | jq --arg env "$DEST_ENV" --argjson variables "$MERGED_VARIABLES" '.environments[] | select(.name==$env) | . + {variables: $variables}')

#Build new release version json
NEW_RELEASE=$(echo $CURRENT_RELEASE | \
    jq --arg env "$DEST_ENV" 'del(.environments[] | select(.name==$env))' | \
    jq --argjson env "$NEW_ENV" '.environments += [$env]' \
)

#Upload new release
echo "Uploading new release"
curl -s -X PUT \
    --user ":$PAT" \
    -H "Content-Type:application/json" \
    --data "$NEW_RELEASE" \
    $PUT_URI

echo "Done"
exit 0