Support for attachments?
I haven't looked into this at all, but would it be possible to migrate attachments also?
I don't think GitHub supports attachments.
IIRC, that was why iTerm uses GitLab for issue tracking, even though the project uses GitHub for code management.
Happy to re-open and explore this if I'm wrong...
Hmmm, you can attach files in the UI (https://help.github.com/articles/file-attachments-on-issues-and-pull-requests/), but not in the API? Can that really be? :(

Is this an attachment?
Indeed attachments are supported now. My bad, I should have googled. And that specific attachment is a visual trip. 😄
On the API side, I'm betting GitHub hasn't added it to their kinda-secret Bulk Import API which is what we use to avoid rate-limiting. But I'm not sure, so I've emailed their support and cc'd @nedbat.
Answer from GitHub support (copy/pasted with their permission):
Hi there Jeff,
Thanks for getting in touch! It isn't currently possible to upload images through the GitHub API the same way you could drag-and-drop an image from your desktop to an Issue Comment box.
If you're interested in a workaround, you could use either the Repo Contents API (high-level API) or the Git Data API (low-level API) to commit images (or other content) to a Git repository:
https://developer.github.com/v3/repos/contents/#create-a-file
https://developer.github.com/v3/git/
Once the image is created, you can create an Issue using the Issues API and link to the images (or other content) you've committed to the repository or add a Markdown inline image link to the contents:
Hope that helps! Feel free to let us know if you have any other questions.
Hmmm, I played around with getting attachments. I figured I could at least add a link to the GitHub issue, that refers to the attachment on Bitbucket. But the Bitbucket api doesn't provide the URL to the attachment on the issue, and the URL doesn't seem easily constructable. I can get the content of the attachments, but I'm not sure where I would put them.
Partially addressed by @nedbat in https://github.com/jeffwidman/bitbucket-issue-migration/pull/102/commits/b2dfda909f69dcd91354982cf62cc198d35be34c
Closing, as I think this is probably as good as we'll get with the current GitHub/Bitbucket APIs... very open to future improvements. And thanks again @nedbat for figuring out at least something here.
I just tested this on a repo I have: https://bitbucket.org/thomthom/solid-inspector/src
For some issues the attachments appear to have transferred:


But for others it did not:


Any ideas why some work and some don't? Only thing I see is that the ones that work appear to have images embedded into the text. But the ones that doesn't the attachments are missing.
From the commit referenced above, it appear that "This issue had attachments:" should appear while processing attachments. No such message was seen in my console.
paging @nedbat:
Any ideas why some work and some don't?
@thomthom I think you see the difference ("images embedded into the text"). Markdown can have an image reference. In that case, the text is simply copied over to GitHub, which also renders the image. In this case, there is no attachment, just markup indicating an image.
Images which are attached are true attachments. How did you run the converter? Did you use --mention-attachments? If not, the attachments are ignored.
Ah, I didn't use that flag. Didn't realize it was there. I was only referring to the list in the README in master.
I will give it another whirl.
I ran it again, but it still didn't pick up my attachments.
λ python migrate.py thomthom/solid-inspector thomthom/solid-inspector thomthom --mention-attachments
Please enter your GitHub password.
Note: If your GitHub account has authentication enabled, you must use a personal access token from https://github.com/settings/tokens in place of a password for this script.
getting issues from bitbucket
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Imported Issue: https://api.github.com/repos/thomthom/solid-inspector/issues/1
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Example: https://bitbucket.org/thomthom/solid-inspector/issues/40 https://github.com/thomthom/solid-inspector/issues/40
Any ideas?