Hooks

Hooks are executable commands that run before or after input/output file handling.

• OpenInputFileHook
• CloseInputFileHook
• OpenOutputFileHook
• CloseOutputFileHook

Hook context is passed through environment variables such as:

• WARC_COMMAND
• WARC_HOOK_TYPE
• WARC_FILE_NAME
• WARC_SRC_FILE_NAME (output hooks)
• WARC_SIZE, WARC_INFO_ID, WARC_HASH, WARC_ERROR_COUNT (close hooks when available)

A non-zero exit code is treated as an error.