LENSFUN-UPDATE-DATA(1)

💖 lensfun-update-data(1) — the glow-up page 💖

okay so this is a General Commands Manual page, bestie. The star of the show is lensfun-update-data, and we're gonna get you two so acquainted.

---

✨ NAME ✨

lensfun-update-data — the lil' command that updates Lensfun's database 🎀

---

🌸 SYNOPSIS 🌸

lensfun-update-data

that's it. no flags, no arguments, no drama. she takes zero notes and zero parameters. iconic behavior honestly. 💅

---

🦋 DESCRIPTION 🦋

okay so context first, because you need the lore. Lensfun is a library that corrects flaws in photographic images introduced by the lens. like, it fixes the lens's mess. and it also contains a comprehensive database of cameras and lenses together with their characteristics, so it can apply automatic corrections to images taken with these devices. slay. 🔥

who uses it? a lot of people, ngl — darktable, digiKam, rawstudio, GimpLensfun, UFRaw, and others. the whole camera-nerd friend group basically. 👑

so, lensfun-update-data is a command-line program that updates Lensfun's database. what does she actually do? she looks whether a new version is available online — vibe check 🌐 — and if this is the case, she fetches the latest version and installs it locally. amazing. no cap. ✨

and there's a fork in the road depending on who you are, bestie:

• If called as root, the database is installed system-wide.
• otherwise, it is installed in the user's directory.

---

🎀 FILES 🎀

so where does the fetched database actually land? lensfun-update-data will place the fetched database in:

• /var/lib/lensfun-updates/ — if called as root 👑
• ~/.local/share/lensfun/updates/ — otherwise 🙈

If necessary, it will create this directory. she's proactive like that. 🫶

If there is already a database, it is replaced fully. not merged, not negotiated with — replaced. fully. 💀

and here's the fun part: if Lensfun detects a database in one of these directories, it will use that instead of the default location below /usr/.... so your local copy wins. main character energy fr. ⭐

---

💜 DIAGNOSTICS 💜

lensfun-update-data prints log messages to stdout. she's chatty, we love her. 🗣️

Exit status:

• 0 — if OK (updates were installed),
• 1 — if no newer version could be found,
• 3 — if no DB location responded validly.

(that 3 is the "nobody answered the phone" status, iykyk 😭)

---

🍓 REPORTING BUGS 🍓

Report bugs at <http://sourceforge.net/p/lensfun/bugs/>. please do, she wants to grow 🧚

---

🌈 COPYRIGHT 🌈

Lensfun is Copyright © 2007 Andrew Zabolotny

• License of the code: GNU Lesser General Public License, version 3
• License of the database: Creative Commons Attribution-Share Alike 3.0 license

---

⭐ SEE ALSO ⭐

• g-lensfun-update-data(1)
• lensfun-add-adapter(1)

---

👑 AUTHOR 👑

This manual page was written by Torsten Bronger <bronger@physik.rwth-aachen.de>

---

and that's the whole page, bestie!! 🫶 this one's dated 2015-03-11 and it's the LENSFUN-UPDATE-DATA(1) page from the General Commands Manual — go forth and keep your lens database fresh 💖✨🌸