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Fable review of the B3 rework, should-fix: run_trace_case.cmake read the
server log only `if(EXISTS ...)`. Under spawn the server process writes its
own file, and the lines the runner counts out of it - the applier Fatal{
lines and the MGWIRE-FLOOR unsound-serial-complete line, which only the
server's VulkanRenderer::OnSubmitsCompletedUpTo emits - are nowhere else,
so a server that died before its first line read as "0 lines" and went
green. The client log was already fail-closed, and so was the tcp arm's
forwarded server log; plain spawn was not.
The plain-spawn branch of the transport block now FATALs when
mobilegl.server.log does not exist, beside the tcp arm's identical check.
Demonstration: the SPAWN ctest command line with TRACE_REPLAY_EXE replaced
by a wrapper that runs the real replay and then deletes
output/mobilegl.server.log (541 lines):
runner at aab01275 -> rc 0, "Fatal{ lines across ... : 0",
"MGWIRE-FLOOR unsound-serial-complete lines: 0" (green, half unseen)
this runner -> rc 1:
CMake Error at run_trace_case.cmake:321 (message):
OpenRA DirectVulkan: MOBILEGL_TRANSPORT=spawn but the run wrote no
.../output/mobilegl.server.log, so the server role's Fatal{ and
MGWIRE-FLOOR lines cannot be counted. A spawn retrace with no
server log cannot be counted as a clean one.
MobileGLTraceReplay.OpenRA.DirectVulkan.SPLIT / .SPAWN unmodified: both
pass, ssim 1.000000, 0 px, 0 MGWIRE-FLOOR lines.