Fetch value for SSM parameter or if not found show list of possible alternatives

fetch_ssm.sh

#!/bin/bash

# Check if parameter path is provided
if [ -z "$1" ]; then
  echo "Usage: $0 <SSM_PARAMETER_PATH>"
  exit 1
fi

PARAMETER_PATH="$1"

# Try to fetch the parameter value
PLAINTEXT_VALUE=$(aws ssm get-parameter \
  --name "$PARAMETER_PATH" \
  --with-decryption \
  --query "Parameter.Value" \
  --output text 2>/dev/null)

# If fetch failed, search and list alternatives
if [ $? -ne 0 ]; then
  echo "Parameter not found: $PARAMETER_PATH"
  
  # Remove the last part after the final slash
  BASE_PATH="${PARAMETER_PATH%/*}/"

  echo "Listing parameters under: $BASE_PATH"
  aws ssm get-parameters-by-path \
    --path "$BASE_PATH" \
    --recursive \
    --query "Parameters[].Name" \
    --output text | tr '\t' '\n'
else
  # Print the found value
  echo "$PLAINTEXT_VALUE"
fi