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Jan Tojnar d3041dbd47
Allow use on repos without commits
When starting a new repository, it does not have any branches
in `.git/refs/heads` and `.git/refs/HEAD` contains a broken
`ref: refs/heads/master` reference.

This means that cloning a repo like we do for cleaning will fail
with very unhelpful message for freshly created repo:

    fatal: bad revision 'HEAD'

This is quite confusing when you create a new repo by copying
Nix files from another, working one, make some trivial changes,
stage them and then try to test a shell.
2020-11-13 18:36:55 +01:00
default.nix Allow use on repos without commits 2020-11-13 18:36:55 +01:00