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Prevent Linux ETXTBSY races in MCP stdio tests - #48724
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## Why Concurrent test spawns can inherit a writable descriptor for the MCP server wrapper, causing `ETXTBSY` when launching it on Linux. ## What changed Write the wrapper through a separate `/bin/sh` process on Linux so its writable descriptor stays out of the test process. Check the writer's exit status and include stderr on failure. Retain direct file writes on other Unix platforms. GitOrigin-RevId: f99952ec000ba7317243e87fd664dc0e31bb7b24
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Prevent Linux ETXTBSY races in MCP stdio tests
Why
Concurrent test spawns can inherit a writable descriptor for the MCP server
wrapper, causing
ETXTBSYwhen launching it on Linux.What changed
Write the wrapper through a separate
/bin/shprocess on Linux so its writabledescriptor stays out of the test process. Check the writer's exit status and
include stderr on failure. Retain direct file writes on other Unix platforms.