snapshot of https://github.com/zulip/zulip.git @ 48c69911c7dd4e03b20552eb3bd77ad8151c1357 (2026-09-15)

puppet/zulip/lib/facter/io_uring_available.rb

@@ -0,0 +1,16 @@
+Facter.add(:io_uring_available) do
+  confine :kernel => 'Linux'
+  setcode do
+    # Syscall 425 is io_uring_setup
+    # https://www.chromium.org/chromium-os/developer-library/reference/linux-constants/syscalls/#x86_64_425
+    # https://manpages.debian.org/trixie/liburing-dev/io_uring_setup.2.en.html
+    #
+    # We get ENOSYS if the kernel doesn't have the syscall, or EPERM
+    # if it's disabled or restricted via seccomp (i.e. in Docker)
+    result = Facter::Core::Execution.execute(
+      "perl -MErrno=EPERM,ENOSYS -e 'syscall(425); exit((\$! != EPERM and \$! != ENOSYS) ? 0 : 1)'",
+      :on_fail => :failed
+    )
+    result != :failed && $?.success?
+  end
+end