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Private Data Objects Environment Variables

Instructions in this document assume the environment variable PDO_SOURCE_ROOT points to the PDO source directory.

PDO uses a number of environment variables to control build, installation and operation. While PDO should build and run with only the default values, four variables are commonly set to reflect specifics of the installation:

In addition, if you run in SGX HW mode you will generally define PDO_SGX_KEY_ROOT as well. See below for information on these variables and others you could override from defaults.

Common Configuration Script

The script build/common-config.sh can be used to set values for all of the environment variables that are used in the build, installation & execution process.

The default usage of this script is to be sourced. For example, local configuration file may be constructed as:

   export PDO_INSTALL_ROOT=${PDO_SOURCE_ROOT}/build/_dev
   export PDO_LEDGER_KEY_ROOT=${PDO_INSTALL_ROOT}/opt/pdo/etc/keys/ledger
   export PDO_LEDGER_URL=http://127.0.0.1:6600

and before building it you call the configuration script as

   source ${PDO_SOURCE_ROOT}/build/common-config.sh

If passed the parameter --evalable-export the script will return a list of export commands of the variables instead of directly exporting them to the environment.

Generic Environment Variables

PDO_INSTALL_ROOT

(default: ${PDO_SOURCE_ROOT}/build/_dev):

PDO_INSTALL_ROOT is the root of the directory in which the virtual enviroment will be built; generally PDO_HOME will point to PDO_INSTALL_ROOT/opt/pdo

PDO_INTERPRETER

(default: wawaka):

PDO_INTERPRETER contains the name of the interpreter to use for processing contracts. wawaka is the default interpreter that executes WASM-based contracts. wawaka-opt enables optimizations in Wawaka's WASM interpreter. For more information on the configuration and use of wawaka, see the interpreter README.

PDO_HOME

(default: ${PDO_INSTALL_ROOT}/opt/pdo):

PDO_HOME is the directory where PDO-specific files are stored for operation. These files include configuration files, data files, compiled contracts, contract user keys and service scripts.

PDO_HOSTNAME

(default: ${HOSTNAME}):

PDO_HOSTNAME identifies the hostname where service interfaces will be exported. Defaults to HOSTNAME.

PDO_DEBUG_BUILD

(default: 0)

PDO_DEBUG_BUILD builds PDO modules for debugging. This includes compile flags, logging statements in the enclave, etc. Since PDO_DEBUG_BUILD potentially exposes information about what is happening inside a contract, do not use with confidential contracts.

WASM_SRC

(default: ${PDO_SOURCE_ROOT}/interpreters/wasm-micro-runtime)

WASM_SRC points to the installation of the wasm-micro-runtime. This is used to build the WASM interpreter for the wawaka contract interpreter. The git submodule points to the latest tagged commit of WAMR we have validated: WAMR-1.1.2.

WASM_MEM_CONFIG

(default: MEDIUM)

WASM_MEM_CONFIG indicates the memory configuration for the WASM runtime: the runtime's global memory pool size, the WASM module's heap size, and the size of module's operand stack. When the variable is set to SMALL, the runtime's global memory pool size is set to 1MB. If the variable is set to MEDIUM, the runtime's memory pool size is set to 2MB. When the variable is set to LARGE, the runtime's memory pool size is set to 4MB.

SGX Environment Variables

SGX_MODE

(default: SIM)

SGX_MODE determines the SGX mode of operation. When the variable is set to SIM, then the SGX enclaves will be compiled for simulator mode. When the variable is set to HW, the enclaves will be compiled to run in a real SGX enclave.

PDO_SGX_KEY_ROOT

(default: ${PDO_SOURCE_ROOT}/build/keys/sgx_mode_${SGX_MODE,,}/):

PDO_SGX_KEY_ROOT is the root directory where SGX and IAS related keys are stored. If SGX_MODE=SIM, the default folder contains mock files that are good for simulation mode. If SGX_MODE=HW, the default (or custom) folder must be filled with legitimate SGX & IAS keys. See SGX section of the BUILD document for more information.

Ledger Environment Variables

PDO_LEDGER_TYPE

(default: ccf):

PDO_LEDGER_TYPE is the ledger to be used with PDO. PDO supports ccf (Microsoft) based ledgers.

PDO_LEDGER_URL

(default: http://127.0.0.1:6600/):

PDO_LEDGER_URL is the URL used to submit transactions to the ledger. This should be the URL for the REST API component.

PDO_LEDGER_KEY_ROOT

(default: ${PDO_INSTALL_ROOT}/opt/pdo/etc/keys/ledger):

PDO_LEDGER_KEY_ROOT is the root directory where the system keys are stored for ledger integration; files in this directory are not automatically generated.