Comment (by Roland Haas):

Hackathon (Perl).

A way to get the default branch name is using this code:

default_branch=$(git symbolic-ref refs/remotes/origin/HEAD | sed 's@^refs/remotes/origin/@@')

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2580/getcomponents-assumes-that-default-branch