298 lines
12 KiB
Plaintext
298 lines
12 KiB
Plaintext
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http:libburnia-project.org
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------------------------------------------------------------------------------
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libisoburn and xorriso. By Vreixo Formoso <metalpain2002@yahoo.es>
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and Thomas Schmitt <scdbackup@gmx.net>
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Integrated sub project of libburnia-project.org.
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http://files.libburnia-project.org/releases/libisoburn-1.2.4.tar.gz
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Copyright (C) 2006-2012 Vreixo Formoso, Thomas Schmitt.
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Provided under GPL version 2 or later.
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------------------------------------------------------------------------------
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libisoburn is a frontend for libraries libburn and libisofs which enables
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creation and expansion of ISO-9660 filesystems on all CD/DVD/BD media supported
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by libburn. This includes media like DVD+RW, which do not support multi-session
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management on media level and even plain disk files or block devices.
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The price for that is thorough specialization on data files in ISO-9660
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filesystem images. So libisoburn is not suitable for audio (CD-DA) or any
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other CD layout which does not entirely consist of ISO-9660 sessions.
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xorriso is an application of libisoburn, libisofs, and libburn, which reads
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commands from program arguments, files, stdin, or readline.
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Its features are also available via a C language API of libisoburn.
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Currently they are fully supported on Linux with kernels >= 2.4,
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on FreeBSD with ATAPI/CAM support enabled in the kernel, see atapicam(4),
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and on OpenSolaris (tested with kernel 5.11).
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On other X/Open compliant systems libburn will only offer POSIX i/o with disk
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file objects, but no direct MMC operation on CD/DVD/BD drives.
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By using this software you agree to the disclaimer at the end of this text:
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"... without even the implied warranty ..."
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Compilation, First Glimpse, Installation
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Dynamic library and compile time header requirements for libisoburn-1.2.4 :
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- libburn.so.4 , version libburn-1.2.4 or higher
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- libisofs.so.6 , version libisofs-1.2.4 or higher
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libisoburn and xorriso will not start with libraries which are older than their
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include headers seen at compile time.
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Obtain libisoburn-1.2.4.tar.gz, take it to a directory of your choice
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and do:
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tar xzf libisoburn-1.2.4.tar.gz
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cd libisoburn-1.2.4
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Within that directory execute:
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./configure --prefix=/usr
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make
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Then become superuser and execute
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make install
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which will make available libisoburn.so.1 and the program xorriso.
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On GNU/Linux it will try to run program ldconfig with the library installation
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directory as only argument. Failure to do so will not abort installation.
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One may disable ldconfig by ./configure option --disable-ldconfig-at-install .
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By use of a version script, the libisoburn.so library exposes no other function
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names but those of the API definitions in <libisoburn/libisoburn.h> and
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<libisoburn/xorriso.h>.
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If -Wl,--version-script=... makes problems with the local compiler, then
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disable this encapsulation feature by
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./configure --disable-versioned-libs
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make clean ; make
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The ./configure script of libisoburn can check via pkg-config whether suitable
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libburn and libisoburn are installed. Regrettably this test failed on several
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systems due to local pkg-config problems. So it is disabled by default and may
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be enabled by:
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./configure --enable-pkg-check-modules
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In this case, ./configure fails if no suitable installations are found.
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xorriso
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libisoburn comes with a command line and dialog application named xorriso,
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which offers a substantial part of libisoburn features to shell scripts and
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users. Its file xorriso/README_gnu_xorriso describes the tarball of the
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derived package GNU xorriso as first preference for a statically linked
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xorriso installation.
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The libisoburn installation described above produces a dynamically linked
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xorriso binary depending on libburn.so, libisofs.so, libisoburn.so.
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After installation documentation is available via
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man xorriso
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man xorrisofs
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man xorrecord
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Several alias links point to the xorriso binary:
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xorrisofs starts xorriso with -as mkisofs emulation already enabled
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xorrecord starts xorriso with -as cdrecord emulation already enabled
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osirrox starts with -osirrox image-to-disk copying already enabled
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By default xorriso will depend on libreadline if the readline-dev headers
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are present. This dependcy can be avoided by running
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./configure --prefix=/usr --disable-libreadline
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make clean ; make
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Never omit the "make clean" command after switching libreadline enabling.
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Other deliberate dependency reduction options of ./configure are:
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--disable-libacl avoid use of ACL functions like acl_to_text()
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--disable-xattr avoid use of xattr functions like listxattr() on Linux
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resp. extattr_list_file() on FreeBSD
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--disable-zlib avoid use of zlib functions like compress2()
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--disable-libjte avoid use of libjte for -jigdo command
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xorriso allows to use external processes as file content filters. This is
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a potential security risk which may be avoided by ./configure option
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--disable-external-filters
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By default the filter feature is disabled if effective user id and real
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user id differ. This ban can be lifted by
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--enable-external-filters-setuid
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In some situations Linux may deliver a better write performance to DVD drives
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if 64 KB rather than 32 KB are transmitted in each write operation.
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64k can be made default at configure time by:
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--enable-dvd-obs-64k
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libisoburn, libisofs, and libburn C language API
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For the lower API concepts and calls see
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./libisoburn/libisoburn.h
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as well as
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/usr/include/libisofs/libisofs.h
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/usr/include/libburn/libburn.h
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xorriso C language API
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Actually the dynamically linked xorriso binary is only a small start program
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for the xorriso API that is implemented inside libisoburn.
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There are API calls for command readers and interpreters, and there are
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API calls for each single command of xorriso.
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Interested programmers should have a look into the API definition at
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xorriso/xorriso.h
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and the start program
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xorriso/xorriso_main.c
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The header file xorriso.h gets installed suitable for
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#include <libisoburn/xorriso.h>
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So after installation of a binary libisoburn package you may find it e.g. as
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/usr/include/libisoburn/xorriso.h
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xorriso under control of a (GUI) frontend process
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The dialog mode allows frontend programs to connect via pipes to the standard
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input and output of xorriso. Several commands of xorriso help with receiving
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and parsing of reply messages.
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As a proof of concept, there is the Tcl/Tk script xorriso-tcltk which can
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be launched by this shell command:
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xorriso-tcltk
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Or in the xorriso build directory, without installation of xorriso:
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xorriso/xorriso -launch_frontend frontend/xorriso-tcltk --stdio --
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In the running GUI, click with the rightmost mouse button on any GUI element
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to get its particular help text.
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See file frontend/README-tcltk for a short introduction.
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See its Tcl code for getting an idea how this gets achieved.
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Further there is the C program frontend/frontend_pipes_xorriso.c which
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forks a xorriso process and shows the same communication gestures as
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xorriso-tcltk.
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In particular it connects to xorriso via two pipes, sends commands, waits
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for all replies of a command, picks info out of the xorriso message sieve,
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and parses reply message lines into words.
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Drives and Disk File Objects
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The user of libisoburn applications needs operating system dependent
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permissions for the CD/DVD/BD drives which shall be used.
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On Linux and FreeBSD this means -rw-permissions, even if only reading is
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intended. On Solaris one needs privileges "basic,sys_devices" and r-permission,
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even if writing is intended.
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A list of rw-accessible drives can be obtained by
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xorriso -devices
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resp. by xorriso API call
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Xorriso_option_devices()
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resp. by libburn API call
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burn_drive_scan()
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A possible source of problems are hald or other automounters.
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If you can spot a process "hald-addon-storage" with the address of
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your desired drive, then consider to kill it.
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A similar process "udisks-daemon: polling ..." can be seen on newer Linuxes.
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On Debian GNU/Linux 6.0.2 amd64 there is
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/lib/udev/rules.d/80-udisks.rules
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where one can remove all CD drives ("sr*") from the list of automountable
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devices:
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KERNEL=="sd*|hd*|mmcblk*|mspblk*", ENV{UDISKS_PRESENTATION_NOPOLICY}="0"
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# KERNEL=="sd*|hd*|sr*|mmcblk*|mspblk*", ENV{UDISKS_PRESENTATION_NOPOLICY}="0"
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Copying the recognition criterion from
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/etc/udev/rules.d/70-persistent-cd.rules
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one can prevent automounting a single drive, too. E.g.:
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SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:11.0-scsi-2:0:0:0", ENV{UDISKS_PRESENTATION_NOPOLICY}:="1"
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If you cannot get rid of the automounter, try whether it helps to always load
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the drive tray manually before starting a write run of xorriso. Wait until the
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drive light is off and the mounted media appears.
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Then try to unmount the mounted media before a write run.
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Besides true optical drives, libisoburn can also address disk files as input or
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output drives. The addresses of the disk files have to be preceded by "stdio:".
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Like:
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"stdio:/tmp/pseudo_drive"
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Note: xorriso by default prefixes "stdio:" to addresses outside the /dev tree
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if they do not lead to an optical drive device file.
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Testing
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For automated and manual tests of xorriso's functionality see file
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releng/README.
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Result comparison with self produced ISO images
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We are quite sure that libisofs produces accurate representations of the disk
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files. This opinion is founded on a lot of test burns and checks by a little
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test program which compares files from the mounted image with the orignals
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on disk. It uses the normal POSIX filesystem calls, i.e. no libburnia stuff.
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This program is not installed systemwide but stays in the installation
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directory of the libisoburn tarball as test/compare_file . Usually it is
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run as -exec payload of a find command. It demands at least three arguments:
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The path of the file to compare, the prefix1 to be cut off from path
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and the prefix2 which gets prepended afterwards to obtain the path of the
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second file to compare.
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As further argument there can be -no_ctime which suppresses the comparison
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of ctime date stamps.
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The exit value is 0 if no difference was detected, non-0 else.
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Example: After
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xorriso ... -pathspecs on -add /=/original/dir --
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mount /media/dvd
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cd test
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compare tree /media/dvd with tree /original/dir :
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find /original/dir -exec ./compare_file '{}' /original/dir /media/dvd ';' \
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and vice versa:
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find /media/dvd -exec ./compare_file '{}' /media/dvd /original/dir ';' \
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------------------------------------------------------------------------------
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License version 2 or later
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as published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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------------------------------------------------------------------------------
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Based on and sub project of:
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libburnia-project.org
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By Mario Danic <mario.danic@gmail.com>,
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Vreixo Formoso <metalpain2002@yahoo.es>
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Thomas Schmitt <scdbackup@gmx.net>
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Copyright (C) 2006-2012 Mario Danic, Vreixo Formoso, Thomas Schmitt.
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We will not raise any legal protest to dynamic linking of our libraries
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with applications that are not under GPL, as long as they fulfill
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the condition of offering the library source code used, whether
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altered or unaltered, under the GPLv2+, along with the application.
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Nevertheless, the safest legal position is not to link libburn with
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non-GPL compatible programs.
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libburnia-project.org is inspired by and in other components still containing
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parts of old
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Libburn. By Derek Foreman <derek@signalmarketing.com> and
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Ben Jansens <xor@orodu.net>
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Copyright (C) 2002-2006 Derek Foreman and Ben Jansens
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libisoburn does not stem from their code.
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