Libguestfs is a library for accessing and modifying guest disk images. Amongst the things this is good for: making batch configuration changes to guests, getting disk used/free statistics (see also: virt-df), migrating between virtualization systems (see also: virt-p2v), performing partial backups, performing partial guest clones, cloning guests and changing registry/UUID/hostname info, and much else besides. Libguestfs uses Linux kernel and qemu code, and can access any type of guest filesystem that Linux and qemu can, including but not limited to: ext2/3/4, btrfs, FAT and NTFS, LVM, many different disk partition schemes, qcow, qcow2, vmdk. Libguestfs provides ways to enumerate guest storage (eg. partitions, LVs, what filesystem is in each LV, etc.). It can also run commands in the context of the guest. Also you can access filesystems over FTP. Libguestfs is a library that can be linked with C and C++ management programs (or management programs written in other languages, if people contribute the language bindings). You can also use it from shell scripts or the command line. Libguestfs was written by Richard W.M. Jones (rjones@redhat.com). For discussion please use the fedora-virt mailing list: https://www.redhat.com/mailman/listinfo/fedora-virt Requirements ---------------------------------------------------------------------- - recent QEMU with vmchannel support - febootstrap >= 1.2 - XDR, rpcgen - perldoc (pod2man, pod2text) to generate the manual pages and other documentation. - (Optional) OCaml if you want to modify the code or rebuild certain generated files, and also to build the OCaml bindings - (Optional) local Fedora mirror - (Optional) Perl if you want to build the perl bindings Running ./configure will check you have all the requirements installed on your machine. Building ---------------------------------------------------------------------- Then make the daemon, library and root filesystem: ./configure [--with-mirror=URI] make Use the optional --with-mirror parameter to specify the URI of a local Fedora mirror. See the discussion of the MIRROR parameter in the febootstrap(8) manpage. Finally run the tests: make check If everything works, you can install the library and tools by running these commands as root: make install Notes on cross-architecture support ---------------------------------------------------------------------- At the moment we basically don't support cross-architecture or 32-on-64. This limits what is possible for some guests. Filesystem operations and FTP export will work fine, but running commands in guests may not be possible. To enable this requires work for cross-architecture and 32-on-64 support in febootstrap, fakeroot and fakechroot. The daemon/ directory contains its own configure script. This is so that in future we will be able to cross-compile the daemon. Mirroring tip ---------------------------------------------------------------------- Having a local Fedora mirror makes a massive difference to the time it takes to build and rebuild initramfs images. Failing that, use squid to cache yum downloads, but read this first: https://lists.dulug.duke.edu/pipermail/yum/2006-August/009041.html (In brief, because yum chooses random mirrors each time, squid doesn't work very well with default yum configuration. To get around this, choose a Fedora mirror which is close to you, set this with './configure --with-mirror=[...]', and then proxy the whole lot through squid by setting http_proxy environment variable). You will also need to substantially increase the squid configuration limits: http://fedoraproject.org/wiki/Using_Mock_to_test_package_builds#Using_Squid_to_Speed_Up_Mock_package_downloads IntelligentMirror is another possibility, although I couldn't get it to work for me. Copyright and license information ---------------------------------------------------------------------- Copyright (C) 2009 Red Hat Inc. The library is distributed under the LGPLv2+. The programs are distributed under the GPLv2+. Please see the files COPYING and COPYING.LIB for full license information.