Libguestfs is tools and a library for accessing and modifying guest disk images. For more information see the home page: http://libguestfs.org/ For discussion, development, patches, etc. please use the mailing list: http://www.redhat.com/mailman/listinfo/libguestfs Requirements ---------------------------------------------------------------------- Running ./configure will check you have all the requirements installed on your machine. Fedora/RHEL users: A useful tip is to run: yum-builddep libguestfs which will install all build dependencies automatically. If that is successful, you don't need to bother with the rest of this section. Debian/Ubuntu users: Take a look at the debian/control file and install everything listed in "Build-Depends". If that is successful, you don't need to bother with the rest of this section. The full requirements are described below. For basic functionality and the C tools: - look at appliance/packagelist.in and install as many of the packages that apply to your distro as possible - recent QEMU >= 0.13 (0.14 or later is better) with virtio-serial support - kernel >= 2.6.34 with virtio-serial support enabled. - virtio-block and virtio-net drivers should be compiled into your host kernel (strictly speaking this is optional, but you will have to make complex changes to the ./configure command line to get it to work if you don't have virtio) - febootstrap >= 3.3 (it is best to use the latest version) Notes: (1) febootstrap 2.x WILL NOT WORK (2) febootstrap 3.x is distro-independent, and is required on Debian and other distros as well as Fedora - XDR, rpcgen (on Linux these are provided by glibc) - cpio - gperf - pcre (Perl Compatible Regular Expressions C library) - genisoimage (NOT mkisofs any more) - hivex >= 1.2.7 (http://libguestfs.org/download) (optional) - libmagic (the library that corresponds to the 'file' command) (optional) - libvirt (optional) - libxml2 (optional) - libconfig (optional) - augeas >= 0.5.0 (http://augeas.net/) (optional) - Berkeley DB 'db_dump' and 'db_load' utilities (db4-utils or db4.X-util or similar) (optional) - systemtap/DTrace userspace probes (optional) http://sourceware.org/systemtap/wiki/AddingUserSpaceProbingToApps - perldoc (pod2man, pod2text, pod2html) to generate the manual pages and other documentation. - Readline to have nicer command-line editing in guestfish (optional) - xmllint (part of libxml2) to validate virt-inspector RELAX NG schema (optional) - OCaml if you want to rebuild the generated files, and also to build the OCaml bindings (optional) - po4a for translating manpages and POD files. This is optional when compiling from the tarball, but mandatory if you compile from git. - getfacl, getfattr libraries and programs (optional) To build FUSE support (guestmount): - FUSE libraries and kernel module (optional) To build language bindings: - Perl if you want to build the perl bindings (optional) - Python if you want to build the python bindings (optional) - Ruby, rake if you want to build the ruby bindings (optional) - Java, JNI, jpackage-utils if you want to build the java bindings (optional) - GHC if you want to build the Haskell bindings (optional) - PHP, phpize if you want to build the PHP bindings (optional) To build the Perl tools: - Perl Sys::Virt module (optional) - Perl Win::Hivex module (optional) - Perl Pod::Usage module (optional) - Perl Test::More module (from perl Test::Simple) (optional) - Perl String::ShellQuote module (optional) - perl-libintl for translating perl code (optional) To run virt-sysprep: - virt-sysprep requires FUSE support since it uses guestmount Building ---------------------------------------------------------------------- Then make the daemon, library and root filesystem: ./configure make Finally run the tests: make check If everything works, you can install the library and tools by running this command as root: make install You can run guestfish, guestmount and the virt tools without needing to install, using the "run" script in the top directory. This script sets up some environment variables. For example: ./run ./fish/guestfish [usual guestfish args ...] ./run ./inspector/virt-inspector [usual virt-inspector args ...] If you are already in the fish/ subdirectory, then the following command will also work: ../run ./guestfish [...] You can also make a symlink (note: NOT a hard link) from your $PATH to the run script, eg: cd ~/bin ln -s ~/libguestfs/run libguestfs-run cd ~/libguestfs libguestfs-run ./inspector/virt-inspector [...] You can also run the C programs under valgrind like this: ./run valgrind [valgrind opts...] ./cat/virt-cat [virt-cat opts...] This also works with sudo (eg. if you need root access for libvirt or to access a block device): sudo ./run ./cat/virt-cat -d LinuxGuest /etc/passwd qemu ---------------------------------------------------------------------- By far the most common problem is with broken or incompatible qemu releases. Different versions of qemu have problems booting the appliance for different reasons. This varies between versions of qemu, and Linux distributions which add their own patches. If you find a problem, you could try using your own qemu built from source (qemu is very easy to build from source), with a 'qemu wrapper'. Qemu wrappers are described in the guestfs(3) manpage. Note on using KVM ---------------------------------------------------------------------- By default the configure script will look for qemu-kvm (KVM support). You will need a reasonably recent processor for this to work. KVM is much faster than using plain Qemu. You may also need to enable KVM support for non-root users, by following these instructions: http://www.linux-kvm.org/page/FAQ#How_can_I_use_kvm_with_a_non-privileged_user.3F On some systems, this will work too: chmod o+rw /dev/kvm On some systems, the chmod will not survive a reboot, and you will need to make edits to the udev configuration. Mirroring tip ---------------------------------------------------------------------- On my machines I can usually rebuild the appliance in around 3 minutes. If it takes much longer for you, use a local distro mirror or squid. To use squid to cache yum downloads, 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 Porting to other Linux distros / non-Linux ---------------------------------------------------------------------- libguestfs itself should be fairly portable to other Linux distributions. Non-Linux ports are trickier, but we will accept patches if they aren't too invasive. The main porting issues are with the dependencies needed to build the appliance. You will need to port the febootstrap first (http://people.redhat.com/~rjones/febootstrap/). Copyright and license information ---------------------------------------------------------------------- Copyright (C) 2009-2011 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.