From: jbicha@ubuntu.com 
  
 On Sat, Aug 16, 2025 at 7:27€€€PM Matthias Geiger  
 wrote: 
 > glycin in 2.x has the option to build a thumbnailer [0]. In addition, 
 gdk-pixbuf now has 
 > the option to build its thumbnailer with libglycin [1]. libglycin is a C 
 > library compiled from Rust (and src:glycin). I think both are things we 
 > want to enable since the rust code is memory safe. I will definitely 
 > enable the glycin-own thumbnailer. Regarding gdk-pixbufs thumbnailer, I 
 > would like to hear the teams' opinions on that. This could be enabled 
 > only conditionally on the release arches for the time being. Upstream 
 > noted the only downside are the loaders being Linux-only since they rely 
 > on libseccomp. 
 > 
 > Links: 
 > 
 > [0]: https://gitlab.gnome.org/GNOME/glycin/-/tree/main/glycin- 
 humbnailer?ref_type=heads 
 > [1]: https://blogs.gnome.org/sophieh/2025/06/13/making-gnomes- 
 dkpixbuf-image-loading-safer/ 
  
 The blog post recommends disabling gdk-pixbuf's own thumbnailer and 
 using glycin's thumbnailer instead (which Ubuntu has packaged with the 
 binary package name glycin-thumbnailers). 
  
 glycin is not available on several non-release architectures [3]. My 
 understanding is that we need to keep a binary package available in 
 release architectures for it to be available in ports. I might be 
 mistaken on that detail. However, Ubuntu would rather not build glycin 
 on i386 but Ubuntu does build gdk-pixbuf for i386. Therefore, this is 
 easy to resolve by keeping the gdk-pixbuf thumbnailers and the 
 without-glycin build option on i386 and the ports where glycin isn't 
 available. 
  
 Currently, the gdk-pixbuf thumbnailers are included with some other 
 utilities in libgdk-pixbuf2.0-bin so maybe we should split those 
 thumbnailers to a separate binary package? 
  
 [3] https://buildd.debian.org/status/package.php?p=glycin 
  
 Thank you, 
 Jeremy B€€cha 
  
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