Unix dump - Revision history

Johanvanderknijff at 17:20, 29 January 2019

2019-01-29T17:20:12Z

Johanvanderknijff at 17:18, 29 January 2019

2019-01-29T17:18:09Z

Johanvanderknijff at 17:17, 29 January 2019

2019-01-29T17:17:15Z

Johanvanderknijff at 18:07, 25 January 2019

2019-01-25T18:07:49Z

Johanvanderknijff at 18:04, 25 January 2019

2019-01-25T18:04:39Z

Johanvanderknijff: Created page with "' {{FormatInfo |formattype=electronic |subcat=Archiving |extensions={} |mimetypes={} |pronom={} }} '''dump''' is an archive format that is written by Unix dump, which is a bac..."

2019-01-25T18:04:26Z

Created page with "' {{FormatInfo |formattype=electronic |subcat=Archiving |extensions={} |mimetypes={} |pronom={} }} '''dump''' is an archive format that is written by Unix dump, which is a bac..."

New page

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{{FormatInfo
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'''dump''' is an archive format that is written by Unix dump, which is a backup program that was popular in the '90s (reference?). Dump files were often written to tape. Dump files can be read using the restore tool. It appears that no specifications exist.

== Variants ==

There are a number of variants to the Unix dump format.

The [https://github.com/file/file/blob/master/magic/Magdir/dump file(1) magic definition of the format] makes a distiction between 'old' and 'new' filesystem variants. Each of these can be big-endian or little endian. In addition a 16-bit subtype of the 'old' variant exists. Finally there is also a ufs2 variant (which again can be big-endian or little endian). In total this results in 7 variants of the format. According to the [http://linux.die.net/man/8/restore restore documentation], the dump file format changed in version 4.4 (of the dump tool?).

== Software ==

* [http://dump.sourceforge.net/ Dump / restore utilities]

== Documentation ==

* [http://linux.die.net/man/8/dump Linux man page for dump]
* [http://linux.die.net/man/8/restore Linux man page for restore]

== References ==

* [[Wikipedia:Dump_(program)]]
* [http://dump.sourceforge.net/isdumpdeprecated.html Is dump really deprecated?]
* [https://searchdatabackup.techtarget.com/tip/Using-Dump-for-Linux-Unix-data-backup Using Dump for Linux/Unix data backup]
* [https://www.hscripts.com/tutorials/linux-commands/restore.html Restore Linux Commands]
* [https://docs.oracle.com/cd/E19253-01/817-5093/bkuprestoretasks-63510/index.html How to Restore UFS Files Interactively]
* [https://github.com/file/file/blob/master/magic/Magdir/dump file(1) magic for dump file format] (also includes patterns for extraction of header fields)

@@ Line 39: / Line 39: @@
 <code><p>mkdir extracted</p></code>
 <code><p>cd extracted</p></code>
-<li><p>Run <code>restore</code> in interactive mode on the dump file you want to extract<ref><p>If you don't run <code>restore</code> as sudo, extraction results in a flood of <code>chown: Operation not permitted</code> messages (the files ''are'' extracted though).</p></ref>:</p>
+<li><p>Run <code>restore</code> in interactive mode on the dump file you want to extract</p>
 <code>sudo restore -if ../../tapes-DDS/1/file000002.dd</code></li>
 <li><p>Inspect the contents of the dump file:</p>
@@ Line 62: / Line 62: @@
 <li><p>Now enter <code>1</code>. Response:</p>
 <pre>set owner/mode for '.'? [yn]</pre></li>
-<li><p>Enter <code>n</code> <ref><p>This needs further investigation, as the implications of this setting are not 100% clear to me.</p></ref></p></li>
+<li><p>Enter <code>n</code></p></li>
 <li><p>When the extraction is finished, exit the interactive restore session:</p>
 <code>restore &gt; q</code></li></ol>
@@ Line 74: / Line 74: @@
 * [https://docs.oracle.com/cd/E19253-01/817-5093/bkuprestoretasks-63510/index.html How to Restore UFS Files Interactively]
 * [https://github.com/file/file/blob/master/magic/Magdir/dump file(1) magic for dump file format] (also includes patterns for extraction of header fields)

← Older revision		Revision as of 17:18, 29 January 2019
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	* [https://docs.oracle.com/cd/E19253-01/817-5093/bkuprestoretasks-63510/index.html How to Restore UFS Files Interactively]		* [https://docs.oracle.com/cd/E19253-01/817-5093/bkuprestoretasks-63510/index.html How to Restore UFS Files Interactively]
	* [https://github.com/file/file/blob/master/magic/Magdir/dump file(1) magic for dump file format] (also includes patterns for extraction of header fields)		* [https://github.com/file/file/blob/master/magic/Magdir/dump file(1) magic for dump file format] (also includes patterns for extraction of header fields)
		+
		+	<references />

← Older revision		Revision as of 17:17, 29 January 2019
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	* [https://github.com/bitsgalore/unix-dump-magic Unix dump format] - includes some minimal sample files, created for testing magic patterns		* [https://github.com/bitsgalore/unix-dump-magic Unix dump format] - includes some minimal sample files, created for testing magic patterns
		+
		+	== Restoring the contents of a dump file ==
		+
		+	To restore the contents of a dump file on a Unix system, first the install the "restore" tool. On Debian-based systems:
		+
		+	<code>sudo apt install dump</code>
		+
		+	Then go through the following steps:
		+
		+	<ol>
		+	<li><p>Create an empty directory, and go to that directory in the command terminal:</p>
		+	<code><p>mkdir extracted</p></code>
		+	<code><p>cd extracted</p></code>
		+	<li><p>Run <code>restore</code> in interactive mode on the dump file you want to extract<ref><p>If you don't run <code>restore</code> as sudo, extraction results in a flood of <code>chown: Operation not permitted</code> messages (the files ''are'' extracted though).</p></ref>:</p>
		+	<code>sudo restore -if ../../tapes-DDS/1/file000002.dd</code></li>
		+	<li><p>Inspect the contents of the dump file:</p>
		+	<code>restore > ls</code>
		+	<p>Result:</p>
		+	<pre> 5bin/ diag/ kvm/ mdec share/ ucbinclude
		+	5include/ dict/ lddrv/ net spool ucblib
		+	5lib/ etc/ lib/ nserve src xpg2bin/
		+	adm export/ local old/ stand xpg2include/
		+	bin/ games/ local-/ openwin/ sys xpg2lib/
		+	boot hosts/ lost+found/ pub tmp
		+	demo/ include/ man sccs/ ucb/</pre></li>
		+	<li><p>Use the <code>add</code>command to add directories that are to be extracted to the directory list. To extract everything:</p>
		+	<code>restore > add .</code></li>
		+	<li><p>Run the <code>extract</code> command:</p>
		+	<code>restore > extract</code>
		+	<p>This results in the following prompt:</p>
		+	<pre> You have not read any volumes yet.
		+	Unless you know which volume your file(s) are on you should start
		+	with the last volume and work towards the first.
		+	Specify next volume # (none if no more volumes):</pre></li>
		+	<li><p>Now enter <code>1</code>. Response:</p>
		+	<pre>set owner/mode for '.'? [yn]</pre></li>
		+	<li><p>Enter <code>n</code> <ref><p>This needs further investigation, as the implications of this setting are not 100% clear to me.</p></ref></p></li>
		+	<li><p>When the extraction is finished, exit the interactive restore session:</p>
		+	<code>restore > q</code></li></ol>

	== References ==		== References ==

← Older revision		Revision as of 18:04, 25 January 2019
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 * [http://linux.die.net/man/8/dump Linux man page for dump]
 * [http://linux.die.net/man/8/restore Linux man page for restore]
 == References ==