hades-git-clone

#!/bin/bash

set -euo pipefail

# hades-git-clone - Git clone wrapper for FQDN rewriting and username injection

# Configuration
SOURCE_FQDN="github.com"
TARGET_FQDN="internal.github.com"

# Function to transform HTTPS URL
transform_url() {
  local url="$1"

  # Only process HTTPS URLs
  if [[ ! "$url" =~ ^https:// ]]; then
    echo "$url"
    return 0
  fi

  local actual_url="$url"

  # Check if URL contains the source FQDN
  if [[ "$url" =~ ^https://${SOURCE_FQDN}/ ]]; then
    # Replace FQDN
    actual_url="${url/${SOURCE_FQDN}/${TARGET_FQDN}}"
  fi

  # Prepend username if environment variable is set (for all HTTPS URLs)
  if [[ -n "${GIT_USER:-}" ]]; then
    local username="${GIT_USER}"
    actual_url="${actual_url/https:\/\//https:\/\/${username}@}"
  fi

  echo "$actual_url"
}

# Main function
main() {
  local git_args=()
  local url_found=false

  # Parse arguments to find the URL
  for arg in "$@"; do
    if [[ "$url_found" == false ]] && [[ "$arg" =~ ^https?:// ]] || [[ "$arg" =~ ^[^-].*:// ]]; then
      # original_url="$arg"
      url_found=true
      # Transform the URL
      git_args+=("$(transform_url "$arg")")
    else
      git_args+=("$arg")
    fi
  done

  # If no URL found, pass through to git clone as-is
  if [[ "$url_found" == false ]]; then
    echo exec git clone "$@"
  fi

  # Execute git clone with actual_url URL
  echo exec git clone "${git_args[@]}"
}

main "$@"