Popping podman/dockers bonnet: Unraveling the image pull process while developing for Forgejo (gpn24)

Popping podman/dockers bonnet: Unraveling the image pull process while developing for Forgejo (gpn24)

Author: CCC media team June 7, 2026 Duration: 17:28
Developing an OCI image pull through cache for Forgejo had some interesting rabbit holes and it was surprisingly hard to get in depth information on a supposedly well known system. So I got to deep dive and do bits of research and reverse engineering to make the parts communicate properly. In this talk I'll share my insights into the process of pulling OCI images according to the distribution spec (and its slight deviations) and try to answer questions like: - Which requests are sent by Podman or the Docker daemon when doing `docker pull image`? - Whats that with the /v2 endpoint and discovery? - How about authentication? - What does the pull sequence look like? - Help, I got an index manifest, what should I do? - How should Forgejo communicate with the daemon for a successful pull? If there is time, I'll also share small pieces of knowledge of where the implementation sits in the Forgejo codebase and how it interacts with the existing package registry. - PR containing the implementation: https://codeberg.org/forgejo/forgejo/pulls/11611 Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://cfp.gulas.ch/gpn24/talk/8SDDSH/

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Author: Episodes: 100

Chaos Computer Club - recent events feed
Podcast Episodes
Vortrag über Glocken (gpn24) [not-audio_url] [/not-audio_url]

Duration: 1:00:08
Vortrag über Glocken, eine kurze Reise hin zu fast sakralen Musikinstrumenten vor ca 40 Jahren erlernte ich den Beruf des Glockengießers. Der Zuschauer wird Details und Kuriositäten erfahren. Glocken sind ein Element der…
Trollen leicht gemacht - Helfen auf der GPN24 (gpn24) [not-audio_url] [/not-audio_url]

Duration: 20:08
Einen Einführung ins Trollen. Was sind Trolle? Was macht sie so unglaublich toll und wieso wäre die GPN ohne sie nicht möglich? Wie funktioniert das Trollsystem? Diese und mehr Fragen beantworten wir hier. Wir erklären d…
Opening - What to hack (gpn24) [not-audio_url] [/not-audio_url]

Duration: 31:36
What to hack – das Opening der Gulaschprogrammiernacht. Handtuch, Zahnbürste und ein Projekt: mehr braucht es nicht. Oder vielleicht doch? Nach einer kurzen Geschichtsstunde über den Ort und die vergangenen 23 Gulaschpro…
Speicherpotential (jh26) [not-audio_url] [/not-audio_url]

Duration: 9:43
Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://c3voc.de
Shut up (jh26) [not-audio_url] [/not-audio_url]

Duration: 5:40
Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://c3voc.de
Merzometer (jh26) [not-audio_url] [/not-audio_url]

Duration: 11:08
Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://c3voc.de
BrainBoost (jh26) [not-audio_url] [/not-audio_url]

Duration: 8:21
Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://c3voc.de
FRIENDS TO GO (jh26) [not-audio_url] [/not-audio_url]

Duration: 6:27
Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://c3voc.de