attempt to sync nexus docker registry

[xelalexv]

attempt to sync nexus docker registry

[fidelina]

I haven't problem on dregsy:0.2.0

[xelalexv]

Thanks for reporting this! I've just tried to reproduce the issue. I'm running two instances of Nexus (3.14.0) locally via Docker. Using dregsy, I first synced library/alpine from DockerHub to the first Nexus, then synced from that to the second Nexus, no problems. I'll investigate further. Are your registries both Nexus? Are they running HTTPS?

[xelalexv]

I may be onto something. When dregsy determines available tags for an image while using the Docker relay, it needs to list local images and then filters out what it's interested in (see here). This logic has changed since version 0.2.0. It seems that the reference to one of the local images in your environment causes an error during the filtering. I added more info to the error message and created branch issue18 and pushed an accompanying image to DockerHub (xelalex/dregsy:issue18). Could you try with that and post output here?

[fidelina]

1. I deleted all docker images.

docker rm -vf $(docker ps -aq)
docker rmi -f $(docker images -aq)
docker volume prune -f
```
2) I ran dregsy as docker relay and as skopeo relay dregsy:issue18. It's work

[https://pastebin.com/SUvhaWaj](docker relay logs) 
[https://pastebin.com/AxXHe6EV](skopeo relay logs )

[xelalexv]

That confirms my analysis. It would have been good though to know which particular reference caused the error. I can imagine that for example an intermediate build image could cause trouble. Anyway, I'll merge the additional log info into master, so we have more info next time we run into a similar situation. Can we close this issue?

[fidelina]

Thanks you very much for your work!