| author | František Kučera <franta-hg@frantovo.cz> |
| Mon, 21 Feb 2022 01:21:22 +0100 | |
| branch | v_0 |
| changeset 330 | 70e7eb578cfa |
| parent 244 | d4f401b5f90c |
| permissions | -rw-r--r-- |
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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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vkládání zápatí, jmenné prostory, saxon
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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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Lepší odsazení, tabulátory.
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</text> |
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</stránka> |