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In original style: let () = let filename = Sys.argv.(1) in let g = Guestfs.create () in Guestfs.add_drive_ro g filename; Guestfs.launch g; let roots = Guestfs.inspect_os g in print_endline (Guestfs.inspect_get_product_name g roots.(0)) The same code in the new OO style: let () = let filename = Sys.argv.(1) in let g = new Guestfs.guestfs in g#add_drive_ro filename; g#launch (); let roots = g#inspect_os () in print_endline (g#inspect_get_product_name roots.(0))
This program generates a large amount of code and documentation for all the daemon actions. To add a new action there are only two files you need to change, 'generator_actions.ml' to describe the interface, and daemon/<somefile>.c to write the implementation. After editing these files, build it (make -C generator) to regenerate all the output files. 'make' will rerun this automatically when necessary. IMPORTANT: This program should NOT print any warnings at compile time or run time. If it prints warnings, you should treat them as errors. OCaml tips: (1) In emacs, install tuareg-mode to display and format OCaml code correctly. 'vim' comes with a good OCaml editing mode by default. (2) Read the resources at http://ocaml-tutorial.org/ (3) A module called 'Generator_foo' is defined in one or two files called 'generator_foo.mli' and 'generator_foo.ml' (NB: lowercase first letter). The *.mli file, if present, defines the public interface for the module. The *.ml file is the implementation. If the *.mli file is missing then everything is exported. Some notable files in this directory: generator_actions.ml The libguestfs API. generator_structs.ml Structures returned by the API. generator_c.ml Generate C API. generator_<lang>.ml Generate bindings for <lang>. generator_main.ml The main generator program.