Felix Gruber authored 8 years ago and Christoph Grüninger committed 8 years ago

In linked worktrees generated with `git worktree`, .git is a file
instead of a directory.

Since dunecontrol was only checking whether .git exists as a directory,
it didn't recognize linked worktrees as git repositories. This problem
can simply be fixed by additionally checking if .git exists as a regular
file.