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Fix invalid regular expression #156861

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Empty parantheses are not supported in regular expressions on
Darwin/macOS. The old regular expression produces an error during
evaluation. This commit fixes that.

Nix‘s `builtins.match` works with extend POSIX regular expressions. The
specification for these regular expression states[^1] that the result
for a left paranthesis immediately followed by a right paranthesis
outside of a bracket expression is undefined.

[^1]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_04_03
This commit is contained in:
Martin Puppe 2022-01-26 16:23:14 +01:00
parent a14bb132b5
commit 6a96992fe0
1 changed files with 1 additions and 1 deletions
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2
nixos/modules/services/networking/kresd.nix
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@ -9,7 +9,7 @@ let
# On Nix level we don't attempt to precisely validate the address specifications.
# The optional IPv6 scope spec comes *after* port, perhaps surprisingly.
mkListen = kind: addr: let
al_v4 = builtins.match "([0-9.]+):([0-9]+)()" addr;
al_v4 = builtins.match "([0-9.]+):([0-9]+)($)" addr;
al_v6 = builtins.match "\\[(.+)]:([0-9]+)(%.*|$)" addr;
al_portOnly = builtins.match "([0-9]+)" addr;
al = findFirst (a: a != null)