From 7b15536583aeddf443cf9c4e76cc1a821b9d4b3c Mon Sep 17 00:00:00 2001
From: Matt McCormick <matt@fideus.io>
Date: Thu, 5 Feb 2026 10:32:14 -0500
Subject: [PATCH] build(docker): generate variables needed for local repo
 builds

---
 src/docker/itk-wasm-base/build.sh             | 11 +++--
 src/docker/itk-wasm-base/generate-env-vars.sh | 44 +++++++++++++++++++
 2 files changed, 52 insertions(+), 3 deletions(-)
 create mode 100755 src/docker/itk-wasm-base/generate-env-vars.sh

diff --git a/src/docker/itk-wasm-base/build.sh b/src/docker/itk-wasm-base/build.sh
index f0e498987..1dc808220 100755
--- a/src/docker/itk-wasm-base/build.sh
+++ b/src/docker/itk-wasm-base/build.sh
@@ -80,14 +80,19 @@ if [[ -n "$local_itk" ]]; then
   local_itk_build_arg="--build-arg USE_LOCAL_ITK=1"
 fi
 
-# Cleanup function to restore ITKLocalCopy to placeholder state
-cleanup_local_itk() {
+# Generate environment variables file for Docker
+"$script_dir/generate-env-vars.sh"
+
+# Cleanup function to restore ITKLocalCopy to placeholder state and remove generated files
+cleanup_build_artifacts() {
   if [[ -n "$local_itk" ]]; then
     rm -rf "$script_dir/ITKLocalCopy"/*
     touch "$script_dir/ITKLocalCopy/.gitkeep"
   fi
+  # Remove generated env vars file
+  rm -f "$script_dir/itk_wasm_env_vars.sh"
 }
-trap cleanup_local_itk EXIT
+trap cleanup_build_artifacts EXIT
 
 $exe $build_cmd $tag_flag quay.io/itkwasm/emscripten-base:latest-$host_arch \
         --build-arg IMAGE=quay.io/itkwasm/emscripten-base \
diff --git a/src/docker/itk-wasm-base/generate-env-vars.sh b/src/docker/itk-wasm-base/generate-env-vars.sh
new file mode 100755
index 000000000..6b97ae508
--- /dev/null
+++ b/src/docker/itk-wasm-base/generate-env-vars.sh
@@ -0,0 +1,44 @@
+#!/usr/bin/env bash
+
+# Generate itk_wasm_env_vars.sh for use in Docker builds
+# This script sources the root itk_wasm_env.bash and extracts only
+# the variables needed by the Dockerfile
+
+set -eo pipefail
+
+script_dir="$(cd "$(dirname "$0")" && pwd)"
+root_dir="$(cd "$script_dir/../../.." && pwd)"
+
+# Source the main environment file
+# Note: We need to handle the fact that itk_wasm_env.bash tries to parse
+# package.json files which may not work in all contexts
+export ITK_WASM_DEV_DOCKER_TAG="${ITK_WASM_DEV_DOCKER_TAG:-latest}"
+
+# Extract the core variables we need
+source "$root_dir/itk_wasm_env.bash" 2>/dev/null || {
+  # If sourcing fails (e.g., due to jq commands), extract manually
+  ITK_WASM_DCMTK_REPOSITORY="${ITK_WASM_DCMTK_REPOSITORY:-https://github.com/InsightSoftwareConsortium/DCMTK}"
+  ITK_WASM_DCMTK_GIT_TAG="${ITK_WASM_DCMTK_GIT_TAG:-2fe4dacbe9c343dba350fcff6eab365241636623}"
+  ITK_WASM_ITK_REPOSITORY="${ITK_WASM_ITK_REPOSITORY:-https://github.com/thewtex/ITK}"
+  ITK_WASM_ITK_BRANCH="${ITK_WASM_ITK_BRANCH:-itkwasm-2025-03-19-25d3162371}"
+}
+
+# Generate the env vars file for Docker
+cat > "$script_dir/itk_wasm_env_vars.sh" << EOF
+#!/usr/bin/env sh
+# Auto-generated by generate-env-vars.sh - DO NOT EDIT
+# Generated from: $root_dir/itk_wasm_env.bash
+
+export ITK_WASM_DCMTK_REPOSITORY="${ITK_WASM_DCMTK_REPOSITORY}"
+export ITK_WASM_DCMTK_GIT_TAG="${ITK_WASM_DCMTK_GIT_TAG}"
+export ITK_WASM_ITK_REPOSITORY="${ITK_WASM_ITK_REPOSITORY}"
+export ITK_WASM_ITK_BRANCH="${ITK_WASM_ITK_BRANCH}"
+EOF
+
+chmod +x "$script_dir/itk_wasm_env_vars.sh"
+
+echo "Generated $script_dir/itk_wasm_env_vars.sh with:"
+echo "  ITK_WASM_ITK_REPOSITORY=${ITK_WASM_ITK_REPOSITORY}"
+echo "  ITK_WASM_ITK_BRANCH=${ITK_WASM_ITK_BRANCH}"
+echo "  ITK_WASM_DCMTK_REPOSITORY=${ITK_WASM_DCMTK_REPOSITORY}"
+echo "  ITK_WASM_DCMTK_GIT_TAG=${ITK_WASM_DCMTK_GIT_TAG}"