`git-annex: user error` occurs after pulled a datalad create commit

[rino.mizuguchi]

With no username and email address set in git, datalad siblings command returns siblings.
But, after pulled a datalad create commit, datalad siblings causes the following error.
If I add the username and email address to my git configuration, the error does not occur, but why do I get this error after the pull?
I would appreciate any suggestions or information.

The steps I tried are as follows

1. create ‘datalad-siblings’ repository on GIN
2. commit Dockerfile to the repository
3. create two jupyter runtime environments(A and B) using BinderHub
4. on A, execute following commands
   4-1. set both ‘user.name’ and ‘user.email’ git configuration variables.
   4-2. datalad create --force
   4-3. `datalad push --to origin’
5. on B, execute following commands
   5-1. datalad siblings → Success
   5-2. datalad update -s origin
   5-3. datalad siblings → Error
   
   

packages version

• datalad==0.17.6
• git==2.35.0
• git-annex==8.20210903

[yarikoptic]

@rino.mizuguchi

If I add the username and email address to my git configuration, the error does not occur, but why do I get this error after the pull?

I can only answer “because you didn’t listen to what was recommended, i.e. to configure git” or that I might not understand your question?

[rino.mizuguchi]

Thank you, yarikoptic.

I understand that git user settings can help, but I am wondering why datalad siblings sometimes returns a list of remotes and sometimes it does not if I do not have user settings.
By the way, at any point in time, if it is git, I can get a list of remotes with git remote -v.