[build-tools] Fix iOS Simulator readiness hang on Xcode 26.4#3794
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #3794 +/- ##
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+ Coverage 57.25% 57.29% +0.04%
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Files 905 905
Lines 39337 39339 +2
Branches 8246 8246
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+ Hits 22520 22534 +14
+ Misses 15347 15336 -11
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sjchmiela
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May 27, 2026
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Why
eas/start_ios_simulatornever starts on the Xcode 26.4 image — it hangs ~30 min then fails.waitForReadyAsyncpollsxcrun simctl io <udid> screenshot /dev/null. Since Xcode 26.4simctl io screenshotwrites the file atomically (temp file + rename in the destination's directory), so/dev/nullfails — it tries to create a file in/dev, which the build user can't:It fails every attempt, so the readiness retry burns its full 30-minute budget. Worked on Xcode 26.2 (which wrote directly to the path).
How
Write the readiness screenshot to a real temp file (
/tmp/shot.png) and remove it after. Works across Xcode versions.Test Plan
Reproduced on a custom build with the real
eas/start_ios_simulator:screenshot /dev/nullfails on 26.4 but a real path works (diagnostic): https://expo.dev/accounts/gwdp/projects/coin-flip/workflows/019e6802-d14d-763e-bd49-5365208727d1yarn typecheckandoxlintpass.