Let's see: - A - yes, update HEAD/branch text file is the key atomic update - C - not sure how to apply this in the context of git, because commited files' co

Let's see: - A - yes, update HEAD/branch text file is the key atomic update - C - not sure how to apply this in the context of git, because commited files' content is kinda free form by design, no schema, no consistency problems - I - there should not be concurrent use of commands, so no. practically this is mostly important for pushing to remote repository, and there it's handled by rejecting the push that comes second, if you make two commits from the same base and push them at the same time - D - yes