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guestfs-ocaml(3) Virtualization Support guestfs-ocaml(3)

名前

guestfs-ocaml - OCaml から libguestfs を使用する方法

書式

モジュール形式:

 let g = Guestfs.create () in
 Guestfs.add_drive_opts g ~format:"raw" ~readonly:true "disk.img";
 Guestfs.launch g;

オブジェクト指向スタイル:

 let g = new Guestfs.guestfs () in
 g#add_drive_opts ~format:"raw" ~readonly:true "disk.img";
 g#launch ();

 ocamlfind opt prog.ml -package guestfs -linkpkg -o prog
or:
 ocamlopt -I +guestfs mlguestfs.cmxa prog.ml -o prog

説明

This manual page documents how to call libguestfs from the OCaml programming language. This page just documents the differences from the C API and gives some examples. If you are not familiar with using libguestfs, you also need to read guestfs(3).

プログラミング形式

There are two different programming styles supported by the OCaml bindings. You can use a module style, with each C function mapped to an OCaml function:

 int guestfs_set_verbose (guestfs_h *g, int flag);

becomes:

 val Guestfs.set_verbose : Guestfs.t -> bool -> unit

Alternately you can use an object-oriented style, calling methods on the class "Guestfs.guestfs":

 method set_verbose : bool -> unit

The object-oriented style is usually briefer, and the minor performance penalty isn't noticeable in the general overhead of performing libguestfs functions.

ハンドルの閉じ方

The handle is closed when it is reaped by the garbage collector. Because libguestfs handles include a lot of state, it is also possible to close (and hence free) them explicitly by calling "Guestfs.close" or the "#close" method.

例外

Errors from libguestfs functions are mapped into the "Guestfs.Error" exception. This has a single parameter which is the error message (a string).

Calling any function/method on a closed handle raises "Guestfs.Handle_closed". The single parameter is the name of the function that you called.

例: ディスクイメージの作成

@CREATE_DISK@

例: 仮想マシンのディスクイメージの検査

@INSPECT_VM@

例: デバッグおよびロギングの有効化

@DEBUG_LOGGING@

関連項目

guestfs(3), guestfs-examples(3), guestfs-erlang(3), guestfs-gobject(3), guestfs-golang(3), guestfs-java(3), guestfs-lua(3), guestfs-perl(3), guestfs-python(3), guestfs-recipes(1), guestfs-ruby(3), http://libguestfs.org/, http://caml.inria.fr/.

著者

Richard W.M. Jones ("rjones at redhat dot com")

COPYRIGHT

Copyright (C) 2010-2012 Red Hat Inc.

LICENSE

BUGS

To get a list of bugs against libguestfs, use this link: https://bugzilla.redhat.com/buglist.cgi?component=libguestfs&product=Virtualization+Tools

To report a new bug against libguestfs, use this link: https://bugzilla.redhat.com/enter_bug.cgi?component=libguestfs&product=Virtualization+Tools

When reporting a bug, please supply:

  • The version of libguestfs.
  • Where you got libguestfs (eg. which Linux distro, compiled from source, etc)
  • Describe the bug accurately and give a way to reproduce it.
  • Run libguestfs-test-tool(1) and paste the complete, unedited output into the bug report.
2020-03-09 libguestfs-1.42.0