When services.syncthing.guiAddress is a unix socket, curlAddressArgs built
`--unix-socket <sock> http://.<path>`. curl >= 8.21 tightened URL parsing and
rejects the bare-dot authority with "URL rejected: Bad hostname" (exit 3), so
every REST call in the merge script fails. Combined with `--retry 1000
--retry-delay 1 --retry-all-errors`, syncthing-init.service retries until
systemd terminates it at the start timeout and Home Manager activation fails.
Use `localhost` as the placeholder authority; --unix-socket still routes the
request to the socket, and localhost is accepted by all curl versions. Add a
regression test asserting the unix-socket path uses http://localhost.
Taken from this nixpkgs commit by @zorrobert:
7a223b2685
Syncthing shared folders can be configured to ignore paths. These
changes add support for this functionality.
Co-authored-by: zorrobert <118135271+zorrobert@users.noreply.github.com>
The gui address option always has a default value, so #8644 ended up
making syncthing-init run for every enabled Syncthing setup.
Treat the default gui address as unset for updater purposes so the init
unit is only generated when Home Manager is actually managing Syncthing
configuration. Add regression tests for the default and explicit
guiAddress cases.
