fix: return non 0 with unsuported recipe

[vjripoll]

Description

Fixes exit code behavior when targeted recipe installation fails.

Problem

When users specify a recipe explicitly using -n/--recipe (targeted install), if the installation fails (e.g., unsupported platform, recipe not found), the CLI incorrectly returns exit code 0 (success):

newrelic install -n unsupported-recipe
echo $? # Returns 0 (wrong!)

This happens because the error handling falls through to the shouldInstallCore() block, which is designed for graceful fallback in guided installation mode. It prints a helpful message but doesn't propagate the error, causing the command to exit successfully.

Solution

Add an early return for targeted installs that propagates the error before reaching the fallback logic:

For targeted installs, return the error to ensure non-zero exit code

  if len(extractedRecipeNames) > 0 {
      return err
  }

This ensures:

• Targeted installs (-n recipe-name): Exit with non-zero code on failure ✅
• Guided installs (no -n flag): Keep graceful fallback behavior ✅

---

BEFORE

---

AFTER

[alvarocabanas]

lgtm

[alvarocabanas]

LGTM