Franz Pletz 46773a15b3 nixos/version: fix case where .git is a symlink ...

Before c9214c394b and
9d396d2e42 if .git is symlink the version
would gracefully default to no git revision. With those changes an
exception is thrown instead.

This introduces a new function `pathIsGitRepo` that checks if
`commitIdFromGitRepo` fails without error so we don't have to
reimplement this logic again and can fail gracefully.

2020-01-20 00:53:44 +01:00

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