fix(services): re-invoke devbox by executable path, not hardcoded name (#1321)

[mikeland73]

Summary

Fixes #1321.

devbox services start|stop|ls|restart (and the non-current-shell path of devbox services up) work by re-invoking devbox inside the computed environment. runDevboxServicesScript builds a command and hands it to RunScript, which writes a small script that evals the command. The command began with the hard-coded string "devbox":

// internal/devbox/services.go
func (d *Devbox) runDevboxServicesScript(ctx context.Context, cmdArgs []string) error {
	cmdArgs = append([]string{"services"}, cmdArgs...)
	return d.RunScript(ctx, devopt.EnvOptions{}, "devbox", cmdArgs)
}

So the generated script effectively runs eval "devbox services ...", which requires the binary to be named exactly devbox and be resolvable on PATH. If the binary is installed or renamed to anything else (a versioned install, a wrapper, devbox-cli, etc.), services commands fail with devbox: command not found.

This was the only real self-invocation of the binary — the process-compose manager already shells out via processComposeConfig.BinPath, and every other devbox ... occurrence in the services code is user-facing help text.

Fix

Reference the currently running binary via os.Executable() instead of the literal "devbox". The path is shell-quoted (via strconv.Quote, matching how the surrounding code already quotes arguments before they are eval'd) so it survives the eval even if it contains spaces. If the executable path can't be determined, it falls back to "devbox" — the previous PATH-lookup behavior.

func devboxBinaryForSelfInvocation() string {
	exe, err := os.Executable()
	if err != nil {
		return "devbox"
	}
	return strconv.Quote(exe)
}

This mirrors the existing use of os.Executable() in internal/devbox/pure_shell.go.

How was it tested?

• go build ./... — clean.
• go vet ./internal/devbox/ — clean.
• gofmt — no diffs.
• Added TestDevboxBinaryForSelfInvocation in internal/devbox/services_test.go, which asserts the helper returns the shell-quoted path to the running binary rather than the literal "devbox". It passes:

  --- PASS: TestDevboxBinaryForSelfInvocation (0.00s)
  

cc @mikeland73 (issue reporter)

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