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1<?xml version="1.0" encoding="UTF-8"?>
2<!--
3 manpage for RTIsoMaker/VISO
4-->
5<!--
6 Copyright (C) 2006-2020 Oracle Corporation
7
8 This file is part of VirtualBox Open Source Edition (OSE), as
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25<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
26<refentry id="viso" lang="en">
27
28 <refentryinfo>
29 <pubdate>$Date: 2022-08-18 18:47:09 +0000 (Thu, 18 Aug 2022) $</pubdate>
30 <title>VISO file format / RTIsoMaker</title>
31 </refentryinfo>
32
33 <refmeta>
34 <refentrytitle>viso</refentrytitle>
35 <manvolnum>8</manvolnum>
36 </refmeta>
37
38 <refnamediv>
39 <!--<refname>VISO</refname>-->
40 <refname>viso</refname>
41 <refpurpose>ISO image maker</refpurpose>
42 <refclass>IPRT</refclass>
43 </refnamediv>
44
45 <refsynopsisdiv>
46 <cmdsynopsis id="synopsis-viso"> <!-- The 'id' is mandatory and must start with 'synopsis-'. -->
47 <command>RTIsoMaker</command>
48 <arg><replaceable>options</replaceable></arg>
49 <arg>@<replaceable>commands.rsp</replaceable></arg>
50 <arg choice="req" rep="repeat"><replaceable>filespec</replaceable></arg>
51 </cmdsynopsis>
52 </refsynopsisdiv>
53
54 <refsect1>
55 <title>Description</title>
56 <para>Construct a virtual ISO 9660 / Joliet / UDF / HFS hybrid image and either write it to a
57 file (RTIsoMaker) or serve it as a virtual image (VISO).</para>
58
59 <refsect2 id="viso-viso">
60 <title>VISO file format</title>
61 <para>A VISO file is a virtual ISO image, i.e. constructed in memory from a bunch of files on
62 the host. A VISO is just the recipe describing how to go about this using a syntax vaguely
63 similar to mkisofs and genisoimage.</para>
64
65 <para>One requirement is that the VISO file must start with one of the
66 <option>--iprt-iso-maker-file-marker</option> options. Which of the options you use will
67 dictate the quoting and escaping rules used when reading the file. The option takes the
68 image UUID as an argument.</para>
69
70 <para>The VISO files are treated as UTF-8 and must not contain any byte order marker (BOM).
71 There is currently no way to comment out lines in a VISO file.</para>
72
73 </refsect2>
74
75 <refsect2 id="viso-filespecs">
76 <title>File specifications and --name-setup</title>
77 <para>All non-options that does not start with '@' are taken to indicate a file, directory,
78 or similar that is should be added to the ISO image. Directories are added recursively and
79 content is subject to filtering options.</para>
80
81 <para>Since there can be up to six different namespaces on an ISO, it is handy to be able to
82 control the names used in each and be able to exclude an object from one or more namespaces.
83 The <option>--name-setup</option> option specifies the file specification format to use
84 forthwith.</para>
85
86 <para>The default setup is:</para>
87 <!-- indent this: -->
88 <para><computeroutput> --name-setup iso+joliet+udf+hfs</computeroutput></para>
89
90 <para>Which means you specify one on-ISO name for all namespaces followed by '=' and the
91 source file system name. Only specifying the source file system will add the
92 file/dir/whatever to the root of the ISO image.</para>
93
94 <para>Lets look at the following two examples:</para>
95
96 <!-- indent these -->
97 <para><computeroutput> /docs/readme.txt=/home/user/Documents/product-x-readme.txt</computeroutput></para>
98 <para><computeroutput> /home/user/Documents/product-x-readme.txt</computeroutput></para>
99
100 <para>In the first case the file <computeroutput>'/home/user/Documents/product-x-readme.txt'</computeroutput>
101 is added to the ISO image as <computeroutput>'/docs/readme.txt'</computeroutput> in all
102 enabled namespaces. In the primary ISO 9660 namespace, the filename will by default be
103 converted to upper case because it's required by the spec.</para>
104
105 <para>In the second case the file is added to the root under the name
106 <computeroutput>'product-x-readme.txt'</computeroutput> in all namespaces. Though, in the
107 primary ISO 9660 namespace the name will be transformed to apply with the current ISO level,
108 probably uppercased, possibly truncated too. </para>
109
110 <para>Given <option>--name-setup iso,joliet,udf</option> you can specify the name individually
111 for each of the three namespace, if you like. If you omit any, they will use last name given.
112 Any names left blank (<computeroutput>==</computeroutput>) will be considered omitted.</para>
113
114 <para>A different name in each namespace:</para>
115 <para><computeroutput> /ISO.TXT=/Joliet.TxT=/UDF.txt=/tmp/iso/real.txt</computeroutput></para>
116 <para>Specific name in the ISO 9660 namespace, same in the rest:</para>
117 <para><computeroutput> /ISO.TXT=/OtherNamespaces.TxT=/tmp/iso/real.txt</computeroutput></para>
118 <para>Omit the file from the ISO 9660 namespace:</para>
119 <para><computeroutput> =/OtherNamespaces.TxT=/tmp/iso/real.txt</computeroutput></para>
120 <para>Omit the file from the joliet namespace:</para>
121 <para><computeroutput> /ISO.TXT==/UDF.TxT=/tmp/iso/real.txt</computeroutput></para>
122 <para>Use the same filename as the source everywhere:</para>
123 <para><computeroutput> /tmp/iso/real.txt</computeroutput></para>
124
125
126 <para>Using for instance <option>--name-setup udf</option> you can add a files/dirs/whatever
127 to select namespace(s) without the more complicated empty name syntax above.</para>
128
129 <para>When adding directories, you can only control the naming and omitting of the directory
130 itself, not any recursively added files and directories below it.</para>
131
132 </refsect2>
133 </refsect1>
134
135 <refsect1 id="viso-options">
136 <title>Options</title>
137
138 <refsect2 id="viso-options-general">
139 <title>General</title>
140
141 <variablelist>
142 <varlistentry>
143 <term><option>-o <replaceable>output-file</replaceable></option></term>
144 <term><option>--output=<replaceable>output-file</replaceable></option></term>
145 <listitem><para>The output filename. This option is not supported in VISO mode.</para></listitem>
146 </varlistentry>
147
148 <varlistentry>
149 <term><option>--name-setup=<replaceable>spec</replaceable></option></term>
150 <listitem><para>Configures active namespaces and how file specifications are to be
151 interpreted. The specification is a comma separated list. Each element in the list is
152 a sub-list separated by space, <computeroutput>'+'</computeroutput> or
153 <computeroutput>'|'</computeroutput> giving the namespaces that elements controls.
154 Namespaces are divied into two major and minor ones, you cannot specifying a minor
155 before the major it belongs to.</para>
156 <para>Major namespaces and aliases in parentheses:</para>
157 <itemizedlist spacing="compact">
158 <listitem><para>iso (primary, iso9660, iso-9660, primary-iso, iso-primary)</para></listitem>
159 <listitem><para>joliet</para></listitem>
160 <listitem><para>udf</para></listitem>
161 <listitem><para>hfs (hfs-plus)</para></listitem>
162 </itemizedlist>
163 <para>Minor namespaces:</para>
164 <itemizedlist spacing="compact">
165 <listitem><para>rock: rock ridge on previous major namespace (iso / joliet)</para></listitem>
166 <listitem><para>iso-rock: rock ridge extensions on primary ISO 9660 namespace</para></listitem>
167 <listitem><para>joliet-rock: rock ridge on joliet namespace (just for fun)</para></listitem>
168 <listitem><para>trans-tbl: translation table file on previous major namespace</para></listitem>
169 <listitem><para>iso-trans-tbl</para></listitem>
170 <listitem><para>joliet-trans-tbl</para></listitem>
171 <listitem><para>udf-trans-tbl</para></listitem>
172 <listitem><para>hfs-trans-tbl</para></listitem>
173 </itemizedlist>
174 </listitem>
175 </varlistentry>
176
177 <varlistentry>
178 <term><option>--name-setup-from-import</option></term>
179 <listitem><para>This is for use following one or more <option>--import-iso</option>
180 operations and will pick a configuration matching the imported content as best we can.
181 If the imported ISOs only had a iso9660 namespace, the joliet, udf and hfs namespaces
182 will be removed. This is useful when adding additional files to the ISO and will
183 prevent guest from picking a namespace without the imported ISO content when mounting it.
184 </para></listitem>
185 </varlistentry>
186
187 <varlistentry>
188 <term><option>--push-iso=<replaceable>iso-file</replaceable></option></term>
189 <term><option>--push-iso-no-joliet=<replaceable>iso-file</replaceable></option></term>
190 <term><option>--push-iso-no-rock-<replaceable>iso-file</replaceable></option></term>
191 <term><option>--push-iso-no-rock-no-joliet=<replaceable>iso-file</replaceable></option></term>
192 <listitem><para>Open the specified ISO file and use it as source file system until the
193 corresponding <option>--pop</option> options is encountered. The variations are for
194 selecting which namespace on the ISO to (not) access. These options are handy for copying
195 files/directories/stuff from an ISO without having to extract them first or using the
196 <computeroutput>:iprtvfs:</computeroutput> syntax.</para>
197 </listitem>
198 </varlistentry>
199
200 <varlistentry>
201 <term><option>--pop</option></term>
202 <listitem><para>Pops a <option>--push-iso</option> of the source file system stack.</para></listitem>
203 </varlistentry>
204
205 <varlistentry>
206 <term><option>--import-iso=<replaceable>iso-file</replaceable></option></term>
207 <listitem><para>Imports everything on the given ISO file, including boot configuration and
208 system area (first 16 sectors) content. You can use <option>--name-setup</option> to omit
209 namespaces.</para></listitem>
210 </varlistentry>
211
212 </variablelist>
213 </refsect2>
214
215 <refsect2 id="viso-options-namespaces">
216 <title>Namespaces</title>
217 <variablelist>
218
219 <varlistentry>
220 <term><option>--iso-level=<replaceable>0|1|2|3</replaceable></option></term> <!-- FIXME: imperfect markup -->
221 <listitem>
222 <para>Sets the ISO level:</para>
223 <itemizedlist spacing="compact">
224 <listitem><para>0: Disable primary ISO namespace.</para></listitem>
225 <listitem><para>1: ISO level 1: Filenames 8.3 format and limited to 4GB - 1.</para></listitem>
226 <listitem><para>2: ISO level 2: 31 char long names and limited to 4GB - 1.</para></listitem>
227 <listitem><para>3: ISO level 3: 31 char long names and support for >=4GB files. (default)</para></listitem>
228 <listitem><para>4: Fictive level used by other tools. Not yet implemented.</para></listitem>
229 </itemizedlist>
230 </listitem>
231 </varlistentry>
232
233 <varlistentry>
234 <term><option>--rock-ridge</option></term>
235 <term><option>--limited-rock-ridge</option></term>
236 <term><option>--no-rock-ridge</option></term>
237 <listitem><para>Enables or disables rock ridge support for the primary ISO 9660 namespace.
238 The <option>--limited-rock-ridge</option> option omits a couple of bits in the root
239 directory that would make Linux pick rock ridge over joliet.</para>
240 <para>Default: <option>--limited-rock-ridge</option></para>
241 </listitem>
242 </varlistentry>
243
244 <varlistentry>
245 <term><option>-J</option></term>
246 <term><option>--joliet</option></term>
247 <term><option>--no-joliet</option></term>
248 <listitem><para>Enables or disable the joliet namespace. This option must precede any file
249 specifications.</para>
250 <para>Default: <option>--joliet</option></para>
251 </listitem>
252 </varlistentry>
253
254 <varlistentry>
255 <term><option>--joliet-ucs-level=<replaceable>1|2|3</replaceable></option></term> <!-- FIXME: imperfect markup -->
256 <term><option>--ucs-level=<replaceable>1|2|3</replaceable></option></term>
257 <listitem><para>Set the Joliet UCS support level. This is currently only flagged in the
258 image but not enforced on the actual path names.</para>
259 <para>Default level: 3</para>
260 </listitem>
261 </varlistentry>
262
263 </variablelist>
264 </refsect2>
265
266 <refsect2 id="viso-options-file-attributes">
267 <title>File Attributes</title>
268 <variablelist>
269
270 <varlistentry>
271 <term><option>--rational-attribs</option></term>
272 <listitem><para>Enables rational file attribute handling (default):</para>
273 <itemizedlist spacing="compact">
274 <listitem><para>Owner ID is set to zero</para></listitem>
275 <listitem><para>Group ID is set to zero</para></listitem>
276 <listitem><para>Mode is set to 0444 for non-executable files.</para></listitem>
277 <listitem><para>Mode is set to 0555 for executable files.</para></listitem>
278 <listitem><para>Mode is set to 0555 for directories, preserving stick bits.</para></listitem>
279 </itemizedlist>
280 </listitem>
281 </varlistentry>
282
283 <varlistentry>
284 <term><option>--strict-attribs</option></term>
285 <listitem><para>Counters <option>--rational-attribs</option> and causes attributes to be
286 recorded exactly as they appear in the source.</para>
287 </listitem>
288 </varlistentry>
289
290 <varlistentry>
291 <term><option>--file-mode=<replaceable>mode</replaceable></option></term>
292 <term><option>--no-file-mode</option></term>
293 <listitem><para>Controls the forced file mode mask for rock ridge, UDF and HFS.</para></listitem>
294 </varlistentry>
295
296 <varlistentry>
297 <term><option>--dir-mode=<replaceable>mode</replaceable></option></term>
298 <term><option>--no-dir-mode</option></term>
299 <listitem><para>Controls the forced directory mode mask for rock ridge, UDF and HFS.</para></listitem>
300 </varlistentry>
301
302 <varlistentry>
303 <term><option>--new-dir-mode=<replaceable>mode</replaceable></option></term>
304 <listitem><para>Controls the default mode mask (rock ridge, UDF, HFS) for directories that
305 are created implicitly. The <option>--dir-mode</option> option overrides this.</para>
306 </listitem>
307 </varlistentry>
308
309 <varlistentry>
310 <term><option>--chmod=<replaceable>mode</replaceable>:<replaceable>on-iso-file</replaceable></option></term>
311 <listitem><para>Explictily sets the rock ridge, UDF and HFS file mode for a file/dir/whatever
312 that has already been added to the ISO. The mode can be octal, <computeroutput>ra+x</computeroutput>,
313 <computeroutput>a+r</computeroutput>, or <computeroutput>a+rx</computeroutput>.
314 (Support for more complicated mode specifications may be implemented at a later point.)</para>
315 <para>Note that only namespaces in the current --name-setup are affected.</para>
316 </listitem>
317 </varlistentry>
318
319 <varlistentry>
320 <term><option>--chown=<replaceable>owner-id</replaceable>:<replaceable>on-iso-file</replaceable></option></term>
321 <listitem><para>Explictily sets the rock ridge, UDF and HFS file owner ID (numeric) for a
322 file/dir/whatever that has already been added to the ISO.</para>
323 <para>Note that only namespaces in the current --name-setup are affected.</para>
324 </listitem>
325 </varlistentry>
326
327 <varlistentry>
328 <term>--chgrp=<replaceable>group-id</replaceable>:<replaceable>on-iso-file</replaceable></term>
329 <listitem><para>Explictily sets the rock ridge, UDF and HFS file group ID (numeric) for a
330 file/dir/whatever that has already been added to the ISO.</para>
331 <para>Note that only namespaces in the current --name-setup are affected.</para>
332 </listitem>
333 </varlistentry>
334
335 </variablelist>
336 </refsect2>
337
338 <refsect2 id="viso-options-booting">
339 <title>Booting</title>
340 <variablelist>
341
342 <varlistentry>
343 <term><option>--eltorito-new-entry</option></term>
344 <term><option>--eltorito-alt-boot</option></term>
345 <listitem><para>Starts a new El Torito boot entry.</para></listitem>
346 </varlistentry>
347
348 <varlistentry>
349 <term><option>--eltorito-add-image=<replaceable>filespec</replaceable></option></term>
350 <listitem><para>File specification of a file that should be added to the image and used as
351 the El Torito boot image of the current boot entry.</para>
352 </listitem>
353 </varlistentry>
354
355 <varlistentry>
356 <term><option>-b <replaceable>on-iso-file</replaceable></option></term>
357 <term><option>--eltorito-boot=<replaceable>on-iso-file</replaceable></option></term>
358 <listitem><para>Specifies a file on the ISO as the El Torito boot image for the current boot
359 entry.</para>
360 </listitem>
361 </varlistentry>
362
363 <varlistentry>
364 <term><option>--eltorito-floppy-12</option></term>
365 <term><option>--eltorito-floppy-144</option></term>
366 <term><option>--eltorito-floppy-288</option></term>
367 <term><option>--no-emulation-boot</option></term>
368 <term><option>--hard-disk-boot</option></term>
369 <listitem><para>Sets the boot image emulation type of the current El Torito boot entry.</para></listitem>
370 </varlistentry>
371
372 <varlistentry>
373 <term><option>--boot-load-seg=<replaceable>seg</replaceable></option></term>
374 <listitem><para>Specify the image load segment for the current El Torito boot entry.</para>
375 <para>Default: 0x7c0</para>
376 </listitem>
377 </varlistentry>
378
379 <varlistentry>
380 <term><option>--boot-load-size=<replaceable>sectors</replaceable></option></term>
381 <listitem><para>Specify the image load size in emulated sectors for the current El Torito
382 boot entry.</para>
383 <para>Default: 4 (sectors of 512 bytes)</para>
384 </listitem>
385 </varlistentry>
386
387 <varlistentry>
388 <term><option>--no-boot</option></term>
389 <listitem><para>Indicates that the current El Torito boot entry isn't bootable. (The BIOS
390 will allegedly configure the emulation, but not attempt booting.)</para>
391 </listitem>
392 </varlistentry>
393
394 <varlistentry>
395 <term><option>--boot-info-table</option></term>
396 <listitem><para>Write a isolinux/syslinux boot info table into the boot image for the
397 current El Torito boot entry.</para>
398 </listitem>
399 </varlistentry>
400
401 <varlistentry>
402 <term><option>--eltorito-platform-id=<replaceable>id</replaceable></option></term>
403 <listitem><para>Set the El Torito platform ID of the current entry, a new entry of the
404 verification entry depending on when it's used. The ID must be one of:
405 <computeroutput>x86</computeroutput>, <computeroutput>PPC</computeroutput>,
406 <computeroutput>Mac</computeroutput>, <computeroutput>efi</computeroutput></para>
407 </listitem>
408 </varlistentry>
409
410 <varlistentry>
411 <term><option>-c <replaceable>namespec</replaceable></option></term>
412 <term><option>--boot-catalog=<replaceable>namespec</replaceable></option></term>
413 <listitem><para>Enters the El Torito boot catalog into the namespaces as a file. The
414 <replaceable>namespec</replaceable> uses the same format as a 'filespec', but omits the
415 final source file system name component.</para>
416 </listitem>
417 </varlistentry>
418
419 <varlistentry>
420 <term><option>-G <replaceable>file</replaceable></option></term>
421 <term><option>--generic-boot=<replaceable>file</replaceable></option></term>
422 <listitem><para>Specifies a file that should be loaded at offset 0 in the ISO image. The
423 file must not be larger than 32KB. When creating a hybrid image, parts of this may be
424 regenerated by partition tables and such.</para>
425 </listitem>
426 </varlistentry>
427
428 </variablelist>
429 </refsect2>
430
431 <refsect2 id="viso-options-string-properties">
432 <title>String properties (applied to active namespaces only)</title>
433 <variablelist>
434
435 <varlistentry>
436 <term><option>--abstract=<replaceable>file-id</replaceable></option></term>
437 <listitem><para>The name of the abstract file in the root dir.</para></listitem>
438 </varlistentry>
439
440 <varlistentry>
441 <term><option>-A <replaceable>text|_file-id</replaceable></option></term>
442 <term><option>--application-id=<replaceable>text|_file-id</replaceable></option></term>
443 <listitem><para>Application ID string or root file name. The latter must be prefixed with
444 an underscore.</para>
445 </listitem>
446 </varlistentry>
447
448 <varlistentry>
449 <term><option>--biblio=<replaceable>file-id</replaceable></option></term>
450 <listitem><para>The name of the bibliographic file in the root dir.</para></listitem>
451 </varlistentry>
452
453 <varlistentry>
454 <term><option>--copyright=<replaceable>file-id</replaceable></option></term>
455 <listitem><para>The name of the copyright file in the root dir.</para></listitem>
456 </varlistentry>
457
458 <varlistentry>
459 <term><option>-P <replaceable>text|_file-id</replaceable></option></term>
460 <term><option>--publisher=<replaceable>text|_file-id</replaceable></option></term>
461 <listitem><para>Publisher ID string or root file name. The latter must be prefixed with an
462 underscore.</para>
463 </listitem>
464 </varlistentry>
465
466 <varlistentry>
467 <term><option>-p <replaceable>text|_file-id</replaceable></option></term>
468 <term><option>--preparer=<replaceable>text|_file-id</replaceable></option></term>
469 <listitem><para>Data preparer ID string or root file name. The latter must be prefixed
470 with an underscore.</para>
471 </listitem>
472 </varlistentry>
473
474 <varlistentry>
475 <term><option>--sysid=<replaceable>text</replaceable></option></term>
476 <listitem><para>System ID string.</para></listitem>
477 </varlistentry>
478
479 <varlistentry>
480 <term><option>--volid=<replaceable>text</replaceable></option></term>
481 <term><option>--volume-id=<replaceable>text</replaceable></option></term>
482 <listitem><para>Volume ID string (label). (It is possible to set different labels for
483 primary ISO 9660, joliet, UDF and HFS by changing the active namespaces using the
484 <option>--name-setup</option> option between <option>--volume-id</option> occurences.)</para>
485 </listitem>
486 </varlistentry>
487
488 <varlistentry>
489 <term><option>--volset=<replaceable>text</replaceable></option></term>
490 <listitem><para>Volume set ID string.</para></listitem>
491 </varlistentry>
492
493 </variablelist>
494 </refsect2>
495
496 <refsect2 id="viso-options-compatibility">
497 <title>Compatibility:</title>
498 <variablelist>
499
500 <varlistentry>
501 <term><option>--graft-points</option></term>
502 <listitem><para>Alias for --name-setup iso+joliet+udf+hfs.</para></listitem>
503 </varlistentry>
504
505 <varlistentry>
506 <term><option>-l</option></term>
507 <term><option>--long-names</option></term>
508 <listitem><para>Allow 31 charater filenames. Just ensure ISO level >= 2 here.</para></listitem>
509 </varlistentry>
510
511 <varlistentry>
512 <term><option>-R</option></term>
513 <term><option>--rock</option></term>
514 <listitem><para>Same as <option>--rock-ridge</option> and <option>--strict-attribs</option>.</para></listitem>
515 </varlistentry>
516
517 <varlistentry>
518 <term><option>-r</option></term>
519 <term><option>--rational-rock</option></term>
520 <listitem><para>Same as <option>--rock-ridge</option> and <option>--rational-attribs</option>.</para></listitem>
521 </varlistentry>
522
523 </variablelist>
524 </refsect2>
525
526
527 <refsect2 id="viso-options-viso-specific">
528 <title>VISO Specific:</title>
529 <variablelist>
530
531 <varlistentry>
532 <term><option>--iprt-iso-maker-file-marker=<replaceable>UUID</replaceable></option></term>
533 <term><option>--iprt-iso-maker-file-marker-bourne=<replaceable>UUID</replaceable></option></term>
534 <term><option>--iprt-iso-maker-file-marker-bourne-sh=<replaceable>UUID</replaceable></option></term>
535 <listitem><para>Used as first option in a VISO file to specify the file UUID and that it is
536 formatted using bourne-shell argument quoting &amp; escaping style.</para>
537 </listitem>
538 </varlistentry>
539
540 <varlistentry>
541 <term><option>--iprt-iso-maker-file-marker-ms=<replaceable>UUID</replaceable></option></term>
542 <term><option>--iprt-iso-maker-file-marker-ms-sh=<replaceable>UUID</replaceable></option></term>
543 <listitem><para>Used as first option in a VISO file to specify the file UUID and that it is
544 formatted using microsoft CRT argument quoting &amp; escaping style.</para>
545 </listitem>
546 </varlistentry>
547
548 </variablelist>
549 </refsect2>
550
551
552 <refsect2 id="viso-options-testing">
553 <title>Testing (not applicable to VISO):</title>
554 <variablelist>
555
556 <varlistentry>
557 <term><option>--output-buffer-size=<replaceable>bytes</replaceable></option></term>
558 <listitem><para>Selects a specific output buffer size for testing virtual image reads.</para></listitem>
559 </varlistentry>
560
561 <varlistentry>
562 <term><option>--random-output-buffer-size</option></term>
563 <listitem><para>Enables randomized buffer size for each virtual image read, using the
564 current output buffer size (<option>--output-buffer-size</option>) as maximum.</para>
565 </listitem>
566 </varlistentry>
567
568 <varlistentry>
569 <term><option>--random-order-verification=<replaceable>size</replaceable></option></term>
570 <listitem><para>Enables verification pass of the image that compares blocks of the given
571 size in random order from the virtual and output images.</para>
572 </listitem>
573 </varlistentry>
574
575 </variablelist>
576 </refsect2>
577
578 </refsect1>
579</refentry>
580
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