[cdalar]

Problem

applyCommand follows the apply file's log with tail -f --pid=$pid. GNU tail checks that PID once per sleep interval, and the default interval is one second, so every apply file kept its SSH session open for up to a second after it had finished. onctl create -a and onctl ssh -a both wait on that session.

Measured from onctl-runners, where each runner microVM is created with a bootstrap script that takes about 0.2 s: over five creates, the script's log was last written 1.29–1.35 s before onctl create returned.

Change

Pass -s 0.1 to tail.

	0.2 s apply file, on a Linux host with GNU coreutils 9.4
before	1.21 s
after	0.31 s

Test plan

• New TestApplyCommandReturnsWhenScriptExits (skips without GNU tail, like the existing apply test)
• go test ./internal/tools/, go vet, golangci-lint run clean
• Old and new command timed side by side on a Linux host (table above)

🤖 Generated with Claude Code

https://claude.ai/code/session_01AKmJku7417CUEaGfeQRx8C

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 39.79%. Comparing base (eeea936) to head (f0a2afa).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1191   +/-   ##
=======================================
  Coverage   39.79%   39.79%           
=======================================
  Files          67       67           
  Lines        7310     7310           
=======================================
  Hits         2909     2909           
  Misses       4401     4401           

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