Trylle

client: New runner.Runner interface to support clients providing custom plugin command runner implementations [GH-270]

Accessible via new ClientConfig field RunnerFunc, which is mutually exclusive with Cmd and Reattach
Reattaching support via ReattachConfig field ReattachFunc

client: New ClientConfig field SkipHostEnv allows omitting the client process' own environment variables from the plugin command's environment [GH-270]

client: Add ID() method to Client for retrieving the pid or other unique ID of a running plugin [GH-272]

server: Support setting the directory to create Unix sockets in with the env var PLUGIN_UNIX_SOCKET_DIR [GH-270]

server: Support setting group write permission and a custom group name or gid owner with the env var PLUGIN_UNIX_SOCKET_GROUP [GH-270]

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