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fix(agent): start devcontainers through agentcontainers package #18471

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Fixes coder/internal#706

Context for the implementation here
coder/internal#706 (comment)

Synchronously starts dev containers defined in terraform with our DevcontainerCLI abstraction, instead of piggybacking off of our agentscripts package. This gives us more control over logs, instead of being reliant on packages which may or may not exist in the user-provided image.

Fixes coder/internal#706

Context for the implementation here
coder/internal#706 (comment)

Synchronously starts dev containers defined in terraform with our
`DevcontainerCLI` abstraction, instead of piggybacking off of our
`agentscripts` package. This gives us more control over logs, instead of
being reliant on packages which may or may not exist in the
user-provided image.
@DanielleMaywood DanielleMaywood requested a review from Copilot June 20, 2025 15:34
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Pull Request Overview

This PR refactors how devcontainers are started by splitting out the devcontainer CLI functionality from the agentscripts package. Key changes include removing post start scripts from agentscripts, updating tests to reference new expected outputs and behavior, and updating the API to synchronously trigger devcontainer creation via a new CreateDevcontainer method.

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

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File Description
agent/agentscripts/agentscripts_test.go Removed tests for post-start scripts and updated expectations.
agent/agentscripts/agentscripts.go Refactored to remove runnerScript and post start script logic.
agent/agentcontainers/testdata/devcontainercli/parse/up.expected Updated expected log output for devcontainer CLI.
agent/agentcontainers/devcontainercli_test.go Updated test file references to expected log output file.
agent/agentcontainers/devcontainercli.go Updated option defaults and logging writer behavior.
agent/agentcontainers/devcontainer_test.go Entire file removed, reflecting changes in devcontainer handling.
agent/agentcontainers/devcontainer.go Removed devcontainer script extraction helper functions.
agent/agentcontainers/api.go Modified recreateDevcontainer to return errors and added CreateDevcontainer.
agent/agent.go Removed legacy handling of experimental devcontainers and added calls to containerAPI.CreateDevcontainer.
Comments suppressed due to low confidence (1)

@@ -401,6 +408,7 @@ func (l *devcontainerCLILogWriter) Write(p []byte) (n int, err error) {
}
if logLine.Level >= 3 {
l.logger.Info(l.ctx, "@devcontainer/cli", slog.F("line", string(line)))
_, _ = l.writer.Write([]byte(logLine.Text + "\n"))
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Copilot AI Jun 20, 2025

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It might be beneficial to check the error returned by l.writer.Write rather than ignoring it. Handling any potential write failure could improve the reliability of the logging.

Suggested change
_, _ = l.writer.Write([]byte(logLine.Text + "\n"))
if _, err := l.writer.Write([]byte(logLine.Text + "\n")); err != nil {
l.logger.Error(l.ctx, "failed to write to log writer", slog.Error(err), slog.F("text", logLine.Text))
}

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Devcontainers: Decrease log spam from running @devcontainers/cli
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