chore: add automatic brew upgrader service - #354
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- Add brew-upgrader service module for macOS launchd - Runs brew upgrade every 3 hours with logging - Integrates into home-manager services - Conditional on Darwin (macOS) platform
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✏️ Tip: You can customize this high-level summary in your review settings. WalkthroughThis pull request introduces a new macOS launchd agent service that automatically upgrades Homebrew packages every 3 hours. It includes a Nix configuration defining the agent with logging, a Bash script that executes the upgrade command, and integration into the home-manager services registry. Changes
Sequence DiagramsequenceDiagram
participant launchd as launchd Daemon
participant bash as Bash
participant brew as Homebrew
participant logs as Log Files
rect rgb(220, 240, 255)
Note over launchd: Every 3 hours (StartInterval: 10800)
end
launchd->>bash: Execute upgrade.sh
activate bash
bash->>bash: set -euo pipefail
bash->>brew: brew upgrade
activate brew
brew-->>bash: upgrade complete
deactivate brew
bash->>logs: StandardOutPath & StandardErrorPath
deactivate bash
rect rgb(240, 255, 240)
Note over launchd: Repeats on schedule
end
Estimated code review effort🎯 2 (Simple) | ⏱️ ~10 minutes
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Summary of ChangesHello @shunkakinoki, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request introduces an automated Homebrew upgrade service for macOS users, managed through Home Manager. It sets up a Highlights
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Performed full review of 838e389...3d80e34
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3 files reviewed | 0 comments | Edit Agent Settings • Read Docs
- Updated the service name for consistency with the newly added brew-upgrader module. - Ensures clarity and alignment with the existing service structure.
Mesa DescriptionTL;DRAdded an automatic Homebrew upgrader service for macOS, running What changed?
Description generated by Mesa. Update settings |
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Code Review
This pull request introduces a new service to automatically upgrade Homebrew packages. While the idea is good, there are a few critical issues in the implementation. A typo in the service name will break the Nix build. The launchd agent is misconfigured with KeepAlive = true, which would cause the upgrade script to run in a resource-intensive loop. Additionally, the upgrade script itself is not robust as it relies on brew being in the PATH, which is not guaranteed in the launchd execution environment. I've provided specific comments and suggestions to address these issues.
| RunAtLoad = true; | ||
| KeepAlive = true; |
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The launchd agent is configured with RunAtLoad = true and KeepAlive = true. This contradicts the PR description ("No RunAtLoad or KeepAlive to avoid immediate or persistent runs") and will cause incorrect behavior.
KeepAlive = truewill causelaunchdto restart the script immediately after it finishes, leading to a continuous loop ofbrew upgradecommands. This will consume significant system resources. For a periodic job controlled byStartInterval,KeepAliveshould befalseor omitted.RunAtLoad = truewill run the job on startup/login. The PR description implies this is not desired.
To ensure the service runs strictly every 3 hours as intended by StartInterval, these options should be removed.
| brewUpgrader = import ./brew-upgrader { inherit pkgs; }; | ||
| in | ||
| [ | ||
| brewUpgrader |
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There's a typo in the service name. The service was defined as brewUpgrader in the let block on line 7, but it's being added to the list as brewUpgrade. This will cause a Nix evaluation error: error: undefined variable 'brewUpgrade'.
brewUpgrader
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| set -euo pipefail | ||
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| brew upgrade |
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The script calls brew directly, assuming it's in the PATH. launchd agents run with a minimal environment and a default PATH that likely does not include the location of the Homebrew executable (e.g., /opt/homebrew/bin on Apple Silicon or /usr/local/bin on Intel Macs). This can cause the script to fail.
To make the script more robust, you should prepend the common Homebrew binary directories to the PATH for the command.
| brew upgrade | |
| PATH="/opt/homebrew/bin:/usr/local/bin:$PATH" brew upgrade |
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Pull Request Overview
This PR adds a new macOS-only launchd service to automatically upgrade Homebrew packages every 3 hours. The service follows existing patterns from other services like code-syncer, using a bash script wrapper and launchd agent configuration.
Key changes:
- New brew-upgrader service with upgrade.sh script that runs
brew upgrade - launchd agent configured to run every 3 hours with logging to /tmp
- Service registration in home-manager/services/default.nix
Reviewed Changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.
| File | Description |
|---|---|
| home-manager/services/default.nix | Imports and registers the new brew-upgrader service module |
| home-manager/services/brew-upgrader/upgrade.sh | Bash script that executes brew upgrade with strict error handling |
| home-manager/services/brew-upgrader/default.nix | Defines the launchd agent configuration for periodic execution |
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| brewUpgrader = import ./brew-upgrader { inherit pkgs; }; | ||
| in | ||
| [ | ||
| brewUpgrader |
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Variable name mismatch: brewUpgrade is referenced here but the variable is declared as brewUpgrader on line 7. This will cause a runtime error when trying to evaluate this file. Change this to brewUpgrader to match the variable declaration.
| RunAtLoad = true; | ||
| KeepAlive = true; |
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The PR description states "No RunAtLoad or KeepAlive to avoid immediate or persistent runs", but both RunAtLoad = true and KeepAlive = true are set here. This contradicts the stated design. With KeepAlive = true, the service will restart immediately if it exits, causing brew upgrade to run continuously in a loop, which is not the intended behavior for a periodic upgrade service. Remove both lines or set them to false to match the design intent of running only every 3 hours via StartInterval.
| RunAtLoad = true; | |
| KeepAlive = true; |
| ProgramArguments = [ | ||
| "${pkgs.bash}/bin/bash" | ||
| "${./upgrade.sh}" | ||
| ]; |
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The brew command is not in the PATH. The script will fail with "brew: command not found" unless brew is already in the user's default environment. Add an Environment.PATH configuration similar to the code-syncer service to ensure brew can be found. For Homebrew on macOS, you likely need to include paths like /opt/homebrew/bin (Apple Silicon) or /usr/local/bin (Intel).
| ]; | |
| ]; | |
| EnvironmentVariables = { | |
| PATH = "/opt/homebrew/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin"; | |
| }; |
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| RunAtLoad = true; | ||
| KeepAlive = true; | ||
| StartInterval = 10800; |
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The launchd agent is configured with RunAtLoad = true; KeepAlive = true; StartInterval = 10800;, but launchd restarts a KeepAlive job immediately after it exits, so the three‑hour interval is effectively ignored. On macOS this agent will loop brew upgrade continuously instead of once every three hours, causing repeated upgrade attempts and log churn rather than the intended scheduled run.
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4 issues found across 3 files
Prompt for AI agents (all 4 issues)
Understand the root cause of the following 4 issues and fix them.
<file name="home-manager/services/default.nix">
<violation number="1" location="home-manager/services/default.nix:10">
`brewUpgrade` is referenced in the service list even though only `brewUpgrader` is defined above, so the module will raise an “undefined variable” error. Use the defined `brewUpgrader` binding instead.</violation>
</file>
<file name="home-manager/services/brew-upgrader/upgrade.sh">
<violation number="1" location="home-manager/services/brew-upgrader/upgrade.sh:5">
`brew upgrade` is executed without ensuring the Homebrew binary is on PATH, so the launchd job will fail with `brew: command not found` when PATH defaults to /usr/bin:/bin:/usr/sbin:/sbin.</violation>
</file>
<file name="home-manager/services/brew-upgrader/default.nix">
<violation number="1" location="home-manager/services/brew-upgrader/default.nix:10">
Setting RunAtLoad to true forces the upgrade script to execute immediately when the agent loads, violating the requirement that it should only run on the three-hour StartInterval.</violation>
<violation number="2" location="home-manager/services/brew-upgrader/default.nix:11">
KeepAlive=true makes launchd restart the brew-upgrader as soon as it exits, which prevents the StartInterval from spacing runs and effectively causes a continuous loop instead of one execution every three hours.</violation>
</file>
Reply to cubic to teach it or ask questions. Re-run a review with @cubic-dev-ai review this PR
| brewUpgrader = import ./brew-upgrader { inherit pkgs; }; | ||
| in | ||
| [ | ||
| brewUpgrade |
There was a problem hiding this comment.
brewUpgrade is referenced in the service list even though only brewUpgrader is defined above, so the module will raise an “undefined variable” error. Use the defined brewUpgrader binding instead.
Prompt for AI agents
Address the following comment on home-manager/services/default.nix at line 10:
<comment>`brewUpgrade` is referenced in the service list even though only `brewUpgrader` is defined above, so the module will raise an “undefined variable” error. Use the defined `brewUpgrader` binding instead.</comment>
<file context>
@@ -4,8 +4,10 @@ let
+ brewUpgrader = import ./brew-upgrader { inherit pkgs; };
in
[
+ brewUpgrade
codeSyncer
dotfilesUpdater
</file context>
| brewUpgrade | |
| brewUpgrader |
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| set -euo pipefail | ||
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| brew upgrade |
There was a problem hiding this comment.
brew upgrade is executed without ensuring the Homebrew binary is on PATH, so the launchd job will fail with brew: command not found when PATH defaults to /usr/bin:/bin:/usr/sbin:/sbin.
Prompt for AI agents
Address the following comment on home-manager/services/brew-upgrader/upgrade.sh at line 5:
<comment>`brew upgrade` is executed without ensuring the Homebrew binary is on PATH, so the launchd job will fail with `brew: command not found` when PATH defaults to /usr/bin:/bin:/usr/sbin:/sbin.</comment>
<file context>
@@ -0,0 +1,5 @@
+
+set -euo pipefail
+
+brew upgrade
</file context>
| brew upgrade | |
| PATH="/opt/homebrew/bin:/usr/local/bin:$PATH" brew upgrade |
| "${pkgs.bash}/bin/bash" | ||
| "${./upgrade.sh}" | ||
| ]; | ||
| RunAtLoad = true; |
There was a problem hiding this comment.
Setting RunAtLoad to true forces the upgrade script to execute immediately when the agent loads, violating the requirement that it should only run on the three-hour StartInterval.
Prompt for AI agents
Address the following comment on home-manager/services/brew-upgrader/default.nix at line 10:
<comment>Setting RunAtLoad to true forces the upgrade script to execute immediately when the agent loads, violating the requirement that it should only run on the three-hour StartInterval.</comment>
<file context>
@@ -0,0 +1,17 @@
+ "${pkgs.bash}/bin/bash"
+ "${./upgrade.sh}"
+ ];
+ RunAtLoad = true;
+ KeepAlive = true;
+ StartInterval = 10800;
</file context>
| RunAtLoad = true; | |
| RunAtLoad = false; |
| "${./upgrade.sh}" | ||
| ]; | ||
| RunAtLoad = true; | ||
| KeepAlive = true; |
There was a problem hiding this comment.
KeepAlive=true makes launchd restart the brew-upgrader as soon as it exits, which prevents the StartInterval from spacing runs and effectively causes a continuous loop instead of one execution every three hours.
Prompt for AI agents
Address the following comment on home-manager/services/brew-upgrader/default.nix at line 11:
<comment>KeepAlive=true makes launchd restart the brew-upgrader as soon as it exits, which prevents the StartInterval from spacing runs and effectively causes a continuous loop instead of one execution every three hours.</comment>
<file context>
@@ -0,0 +1,17 @@
+ "${./upgrade.sh}"
+ ];
+ RunAtLoad = true;
+ KeepAlive = true;
+ StartInterval = 10800;
+ StandardOutPath = "/tmp/brew-upgrader.log";
</file context>
| KeepAlive = true; | |
| KeepAlive = false; |
Changes Made
brew upgradein strict modeTechnical Details
Testing
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Summary by cubic
Adds a macOS launchd service that automatically runs brew upgrade every 3 hours. Logs output to /tmp and integrates the service into Home Manager.
Written for commit 53e1c40. Summary will update automatically on new commits.