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fix: agentcontainers: fix flake when ctx cancelled while running docker inspect #18526

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Merged
merged 2 commits into from
Jun 24, 2025
+20 −2
Merged

fix: agentcontainers: fix flake when ctx cancelled while running docker inspect #18526

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fix: agentcontainers: fix flake when ctx cancelled while running dock…
johnstcn Jun 24, 2025
6f6a29e
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johnstcn Jun 24, 2025
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12 changes: 10 additions & 2 deletions agent/agentcontainers/api.go
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Original file line number Diff line number Diff line change
Expand Up @@ -378,7 +378,11 @@ func (api *API) updaterLoop() {
// and anyone looking to interact with the API.
api.logger.Debug(api.ctx, "performing initial containers update")
if err := api.updateContainers(api.ctx); err != nil {
api.logger.Error(api.ctx, "initial containers update failed", slog.Error(err))
if errors.Is(err, context.Canceled) {
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Note that context.Canceled doesn't, by default, trigger test failure. Still, nice to not pollute the error stream.

api.logger.Warn(api.ctx, "initial containers update canceled", slog.Error(err))
} else {
api.logger.Error(api.ctx, "initial containers update failed", slog.Error(err))
}
} else {
api.logger.Debug(api.ctx, "initial containers update complete")
}
Expand All @@ -399,7 +403,11 @@ func (api *API) updaterLoop() {
case api.updateTrigger <- done:
err := <-done
if err != nil {
api.logger.Error(api.ctx, "updater loop ticker failed", slog.Error(err))
if errors.Is(err, context.Canceled) {
api.logger.Warn(api.ctx, "updater loop ticker canceled", slog.Error(err))
} else {
api.logger.Error(api.ctx, "updater loop ticker failed", slog.Error(err))
}
}
default:
api.logger.Debug(api.ctx, "updater loop ticker skipped, update in progress")
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36 changes: 23 additions & 13 deletions agent/agentcontainers/containers_dockercli.go
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Original file line number Diff line number Diff line change
Expand Up @@ -311,21 +311,31 @@ func (dcli *dockerCLI) List(ctx context.Context) (codersdk.WorkspaceAgentListCon
// container IDs and returns the parsed output.
// The stderr output is also returned for logging purposes.
func runDockerInspect(ctx context.Context, execer agentexec.Execer, ids ...string) (stdout, stderr []byte, err error) {
var stdoutBuf, stderrBuf bytes.Buffer
cmd := execer.CommandContext(ctx, "docker", append([]string{"inspect"}, ids...)...)
cmd.Stdout = &stdoutBuf
cmd.Stderr = &stderrBuf
err = cmd.Run()
stdout = bytes.TrimSpace(stdoutBuf.Bytes())
stderr = bytes.TrimSpace(stderrBuf.Bytes())
if err != nil {
if bytes.Contains(stderr, []byte("No such object:")) {
// This can happen if a container is deleted between the time we check for its existence and the time we inspect it.
return stdout, stderr, nil
select {
case <-ctx.Done():
// If the context is done, we don't want to run the command.
return []byte{}, []byte{}, ctx.Err()
default:
var stdoutBuf, stderrBuf bytes.Buffer
cmd := execer.CommandContext(ctx, "docker", append([]string{"inspect"}, ids...)...)
cmd.Stdout = &stdoutBuf
cmd.Stderr = &stderrBuf
err = cmd.Run()
stdout = bytes.TrimSpace(stdoutBuf.Bytes())
stderr = bytes.TrimSpace(stderrBuf.Bytes())
if err != nil {
if ctx.Err() != nil {
// If the context was canceled, we don't want to return an error.
return stdout, stderr, ctx.Err()
}
if bytes.Contains(stderr, []byte("No such object:")) {
// This can happen if a container is deleted between the time we check for its existence and the time we inspect it.
return stdout, stderr, nil
}
return stdout, stderr, err
}
return stdout, stderr, err
return stdout, stderr, nil
}
return stdout, stderr, nil
}

// To avoid a direct dependency on the Docker API, we use the docker CLI
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