Create a Git repo with only the history and content of /blueprint
This involves creating a new Git repo that:
1. Only contains the blueprint directorie’s content.
2. Inherits the current Git repo’s history for that content, and
nothing else.
git-filter-branch(1) should be a good start.
To rewrite the repository to look as if foodir/ had been its project root, and discard all other history:
git filter-branch --subdirectory-filter foodir -- --all
Parent Task: #9174
Related issues
Original created by @sajolida on 9175 (Redmine)