horsicq/Detect-It-Easy

AppImage: Cannot load database: $data/db

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#364 opened on Jun 28, 2026

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bughelp wanted

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Description

Hello, I'm trying to run the AppImage version on openSUSE Tumbleweed. Version 3.21 struggled with lots of things (initial window placement out of screen, theme loading didn't work), but beta 3.22 seems better so far.

However, there seems to be an issue with loading the database. When dragging an executable into the window I just get "unknown", with a single log line:

Cannot load database: $data/db

Probably unrelated: There seems to be an issue with loading some PNGs as well, seeing this when running die from the terminal:

libpng warning: zTXt: unexpected end of LZ stream
libpng warning: iCCP: unexpected end of LZ stream
libpng error: IDAT: invalid distance too far back
libpng warning: iCCP: invalid distance too far back
libpng error: IDAT: incorrect header check
libpng warning: iCCP: invalid distance too far back
libpng error: IDAT: incorrect header check
libpng warning: iCCP: invalid distance too far back
libpng error: IDAT: incorrect header check
libpng warning: iCCP: invalid distance too far back
libpng error: IDAT: invalid distance too far back
libpng warning: iCCP: invalid distance too far back
libpng error: IDAT: invalid distance too far back
libpng warning: iCCP: invalid distance too far back
libpng error: IDAT: invalid distance too far back
libpng warning: iCCP: invalid distance too far back
libpng error: IDAT: incorrect header check
libpng warning: iCCP: invalid distance too far back
libpng error: IDAT: incorrect header check
libpng warning: zTXt: unexpected end of LZ stream
libpng warning: iCCP: unexpected end of LZ stream
libpng error: IDAT: invalid distance too far back

Contributor guide

Research direction
Investigate why the database path resolves to '$data/db' in the AppImage. Check the AppImage packaging script and ensure the database directory is included and the working directory is set correctly. Also verify if the PNG loading errors are related or separate, possibly due to corrupt images in the packaging.
Tech stack
cpp
Domain
desktop
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Needs investigation
Prerequisites
GitLinuxAppImage
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60