[ansible/venv] Fix potential wrapper race condition

[goldyfruit]

Closes #196

Summary by CodeRabbit

• Bug Fixes

  • Enhanced the handling of the /tmp/combo_locks directory to prevent race conditions.
  • Corrected a typo in the comment regarding the start of the ovos_PHAL_admin Python binary.

• Chores

  • Improved directory creation and ownership settings for smoother service startup.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

The pull request modifies the wrapper-ovos-phal-admin.sh.j2 script to improve the management of the /tmp/combo_locks directory. A new conditional block has been added to ensure the directory is created with the correct permissions if it does not exist after a specified number of attempts. Additionally, a minor correction was made to a comment in the script regarding the starting of the ovos_PHAL_admin Python binary.

Changes

File Path	Change Summary
ansible/roles/ovos_installer/templates/virtualenv/wrapper-ovos-phal-admin.sh.j2	Added logic to handle /tmp/combo_locks directory creation with ownership settings; corrected a comment typo.

Assessment against linked issues

Objective	Addressed	Explanation
Address race condition in the ovos-phal-admin wrapper (#196)	✅

Possibly related PRs

• [ansible/venv] Use a wrapper for ovos-phal-admin systemd unit #183: Modifications to the wrapper-ovos-phal-admin.sh script, focusing on the management of the /tmp/combo_locks directory, relate closely to the changes made in this PR.

Poem

In the script where bunnies play,
A lock was fixed, come what may.
With paths secured and permissions right,
The ovos admin takes to flight!
Hops and jumps, all clear ahead,
No more loops, just joy instead! 🐇✨

---

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[coderabbitai]

Actionable comments posted: 1

🧹 Outside diff range and nitpick comments (2)

ansible/roles/ovos_installer/templates/virtualenv/wrapper-ovos-phal-admin.sh.j2 (2)

Line range hint 1-24: Consider additional race condition edge cases.

While the changes address the primary race condition, there are a few edge cases to consider:

1. The directory could be deleted after creation but before the service starts
2. Multiple instances of this wrapper running simultaneously could interfere with each other
3. The fixed 1-second sleep interval might not be optimal for all systems

Consider these improvements:

1. Add a file lock mechanism to handle multiple instances
2. Use exponential backoff instead of fixed sleep
3. Add a final verification step before starting the service

Example file lock implementation:

LOCK_FILE="/tmp/ovos-phal-admin-wrapper.lock"
if ! mkdir "$LOCK_FILE" 2>/dev/null; then
    echo "Another instance is running" >&2
    exit 1
fi
trap 'rm -rf "$LOCK_FILE"' EXIT

---

Line range hint 9-9: Fix typo in comment: "compoenents" → "components"

📜 Review details

Configuration used: CodeRabbit UI
Review profile: CHILL

📥 Commits

Reviewing files that changed from the base of the PR and between f3a140b and 4f469e6.

📒 Files selected for processing (1)

• ansible/roles/ovos_installer/templates/virtualenv/wrapper-ovos-phal-admin.sh.j2 (1 hunks)

🔇 Additional comments (1)

ansible/roles/ovos_installer/templates/virtualenv/wrapper-ovos-phal-admin.sh.j2 (1)

Line range hint 1-24: Overall approach effectively addresses issue #196.

The implementation successfully prevents the infinite loop scenario by:

1. Limiting the number of attempts
2. Providing a fallback directory creation
3. Ensuring proper permissions

This should resolve the high CPU usage issue reported in #196.