relpipe-data/examples-filesystem-xattr.xml
author František Kučera <franta-hg@frantovo.cz>
Mon, 21 Feb 2022 00:43:11 +0100
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Release v0.18
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<stránka
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	xmlns="https://trac.frantovo.cz/xml-web-generator/wiki/xmlns/strana"
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	xmlns:m="https://trac.frantovo.cz/xml-web-generator/wiki/xmlns/makro">
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	<nadpis>Reading extended attributes using relpipe-in-filesystem</nadpis>
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	<perex>accessing xattr of given files e.g. xdg.origin.url</perex>
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	<m:pořadí-příkladu>01300</m:pořadí-příkladu>
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	<text xmlns="http://www.w3.org/1999/xhtml">
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		<p>
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			Extended attributes (xattr) are additional <em>key=value</em> pairs that can be attached to our files.
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			They are not stored inside the files, but on the filesystem.
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			Thus they are independent of particular file format (which might not support metadata)
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			and we can use them e.g. for tagging, cataloguing or adding some notes to our files.
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			Some tools like GNU Wget use extended attributes to store metadata like the original URL from which the file was downloaded.
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		</p>
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		<m:pre jazyk="bash"><![CDATA[wget --recursive --level=1 https://relational-pipes.globalcode.info/
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find -type f -printf '%P\0' \
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	| relpipe-in-filesystem --file path --file size --xattr xdg.origin.url  \
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	| relpipe-out-tabular
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]]></m:pre>
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		<p>And now we know, where the files on our disk came from:</p>
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		<pre><![CDATA[filesystem:
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 ╭───────────────────────────┬────────────────┬────────────────────────────────────────────────────────────────────╮
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 │ path             (string) │ size (integer) │ xdg.origin.url                                            (string) │
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 ├───────────────────────────┼────────────────┼────────────────────────────────────────────────────────────────────┤
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 │ index.html                │          12159 │ https://relational-pipes.globalcode.info/v_0/                      │
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 │ v_0/atom.xml              │           4613 │ https://relational-pipes.globalcode.info/v_0/atom.xml              │
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 │ v_0/rss.xml               │           4926 │ https://relational-pipes.globalcode.info/v_0/rss.xml               │
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 │ v_0/js/skript.js          │           2126 │ https://relational-pipes.globalcode.info/v_0/js/skript.js          │
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 │ v_0/css/styl.css          │           2988 │ https://relational-pipes.globalcode.info/v_0/css/styl.css          │
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 │ v_0/css/relpipe.css       │           1095 │ https://relational-pipes.globalcode.info/v_0/css/relpipe.css       │
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 │ v_0/css/syntaxe.css       │           3584 │ https://relational-pipes.globalcode.info/v_0/css/syntaxe.css       │
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 │ v_0/index.xhtml           │          12159 │ https://relational-pipes.globalcode.info/v_0/index.xhtml           │
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 │ v_0/grafika/logo.png      │           3298 │ https://relational-pipes.globalcode.info/v_0/grafika/logo.png      │
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 │ v_0/principles.xhtml      │          17171 │ https://relational-pipes.globalcode.info/v_0/principles.xhtml      │
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 │ v_0/roadmap.xhtml         │          11097 │ https://relational-pipes.globalcode.info/v_0/roadmap.xhtml         │
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 │ v_0/faq.xhtml             │          11080 │ https://relational-pipes.globalcode.info/v_0/faq.xhtml             │
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 │ v_0/specification.xhtml   │          12983 │ https://relational-pipes.globalcode.info/v_0/specification.xhtml   │
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 │ v_0/implementation.xhtml  │          10810 │ https://relational-pipes.globalcode.info/v_0/implementation.xhtml  │
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 │ v_0/examples.xhtml        │          76958 │ https://relational-pipes.globalcode.info/v_0/examples.xhtml        │
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 │ v_0/license.xhtml         │          65580 │ https://relational-pipes.globalcode.info/v_0/license.xhtml         │
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 │ v_0/screenshots.xhtml     │           5708 │ https://relational-pipes.globalcode.info/v_0/screenshots.xhtml     │
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 │ v_0/download.xhtml        │           5204 │ https://relational-pipes.globalcode.info/v_0/download.xhtml        │
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 │ v_0/contact.xhtml         │           4940 │ https://relational-pipes.globalcode.info/v_0/contact.xhtml         │
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 │ v_0/classic-example.xhtml │           9539 │ https://relational-pipes.globalcode.info/v_0/classic-example.xhtml │
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 ╰───────────────────────────┴────────────────┴────────────────────────────────────────────────────────────────────╯
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Record count: 20]]></pre>
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		<p>
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			If we like the BeOS/Haiku style, we can create empty files with some attributes attached and use our filesystem as a simple database
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			and query it using relational tools.
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			It will lack indexing, but for basic scenarios like <em>address book</em> it will be fast enough
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			and we can feel a bit of BeOS/Haiku atmosphere in our contemporary GNU/Linux systems.
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			But be careful with that because some editors delete and recreate files while saving them, which destroys the xattrs.
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			Tools like <code>rsync</code> or <code>tar</code> with <code>--xattrs</code> option will backup our attributes securely.
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		</p>
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	</text>
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</stránka>