Serialize concurrent sessions; demote critical-package retry note to Info - #12
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…Info Two BootstrapMate sessions running at once (an MDM-triggered run racing an interactive one) share the cache directory and the Windows Installer mutex, so they corrupt each other: 1618s, cache files deleted mid-install, "file in use" failures. Add a Global\BootstrapMate.SingleInstance mutex - the second session waits (up to 30 minutes) for the first to finish, then runs normally, so concurrency becomes a queue instead of an error class. Also log "CRITICAL PACKAGE ... aggressive retry strategy" at Info: it describes normal behavior for critical packages, not a problem.
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Companion to windowsadmins/sbin-installer#9. A second BootstrapMate session now waits on Global\BootstrapMate.SingleInstance instead of racing the first (shared cache + MSI mutex made concurrent runs cascade into 1618/file-in-use failures, as seen 2026-07-21). Also demotes the critical-package aggressive-retry line from Warning to Info.