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This PR adds end-to-end Unix domain socket (UDS) support, allowing zen CLI to discover and connect to UDS-only servers automatically.
- **`unix://` URI scheme in zen CLI**: The `-u` / `--hosturl` option now accepts `unix:///path/to/socket` to connect to a zenserver via a Unix domain socket instead of TCP.
- **Per-instance shared memory for extended server info**: Each zenserver instance now publishes a small shared memory section (keyed by SessionId) containing per-instance data that doesn't fit in the fixed-size ZenServerEntry -- starting with the UDS socket path. This is a 4KB pagefile-backed section on Windows (`Global\ZenInstance_{sessionid}`) and a POSIX shared memory object on Linux/Mac (`/UnrealEngineZen_{sessionid}`).
- **Client-side auto-discovery of UDS servers**: `zen info`, `zen status`, etc. now automatically discover and prefer UDS connections when a server publishes a socket path. Servers running with `--no-network` (UDS-only) are no longer invisible to the CLI.
- **`kNoNetwork` flag in ZenServerEntry**: Servers started with `--no-network` advertise this in their shared state entry. Clients skip TCP fallback for these servers, and display commands (`ps`, `status`, `top`) show `-` instead of a port number to indicate TCP is not available.
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- Improvement: Use consistent language for command line argument parsing errors
- Improvement: Changed zen command parsing errors to output help first and error last to make it easier to spot the error
- Improvement: Refactor zen command return codes to conform to valid Linux range (0-255)
kSuccess = 0,
kOtherError = 1,
kBadInput = 2,
kOutOfMemory = 16,
kOutOfDisk = 17,
kAssertError = 70,
kHttpOtherClientError = 80,
kHttpCantConnectError = 81,
kHttpNotFound = 66, // NotFound(404)
kHttpUnauthorized = 77, // Unauthorized(401),
kHttpSLLError = 82,
kHttpForbidden = 83, // Forbidden(403)
kHttpTimeout = 84, // RequestTimeout(408)
kHttpConflict = 85, // Conflict(409)
kHttpNoHost = 86,
kHttpOtherServerError = 90,
kHttpInternalServerError = 91, // InternalServerError(500)
kHttpServiceUnavailable = 69, // ServiceUnavailable(503)
kHttpBadGateway = 92, // BadGateway(502)
kHttpGatewayTimeout = 93, // GatewayTimeout(504)
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* add color coded logging level to console output (for warn/err/crit levels)
* clean up console output
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* `--output-path` option added to `zen version` command
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this change aims to hide logging internals from client code, in order to make it easier to extend and take more control over the logging process in the future.
As a bonus side effect, the generated code is much tighter (net delta around 2.5% on the resulting executable which includes lots of thirdparty code) and should take less time to compile and link.
Client usage via macros is pretty much unchanged. The main exposure client code had to spdlog internals before was the use of custom loggers per subsystem, where it would be common to have `spdlog::logger` references to keep a reference to a logger within a class. This is now replaced by `zen::LoggerRef` which currently simply encapsulates an actual `spdlog::logger` instance, but this is intended to be an implementation detail which will change in the future.
The way the change works is that we now handle any formatting of log messages in the zencore logging subsystem instead of relying on `spdlog` to manage this. We use the `fmt` library to do the formatting which means the client usage is identical to using `spdlog`. The formatted message is then forwarded onto any sinks etc which are still implememted via `spdlog`.
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* move commands in scrub.h/cpp to admin_cmd.h/cpp
* move job command into admin_cmd.h/.cpp
* admin -> admin_cmd
* bench -> bench_cmd
* cache -> cache_cmd
* copy -> copy_cmd
* dedup -> dedup_cmd
* hash -> hash_cmd
* print -> print_cmd
* projectstore -> projectstore_cmd
* rpcreplay -> rpcreplay_cmd
* serve -> serve_cmd
* status -> status_cmd
* top -> top_cmd
* trace -> trace_cmd
* up -> up_cmd
* version -> version_cmd
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