bundle/commands/exec: check that Brewfile is installed with --check

`brew bundle exec` behaves correctly only after doing `brew bundle install`.

Running `brew bundle check` can be slow, so let's add a `--check` flag
to `brew bundle exec` which will also run `brew bundle check` before
`brew bundle exec` to ensure that the `Brewfile` has been installed
before proceeding.

Author: carlocab

Library/Homebrew/bundle/commands/check.rb

@@ -10,7 +10,7 @@ module Check
         ARROW = "→"
         FAILURE_MESSAGE = "brew bundle can't satisfy your Brewfile's dependencies."
 
-        def self.run(global: false, file: nil, no_upgrade: false, verbose: false)
+        def self.run(global: false, file: nil, no_upgrade: false, verbose: false, quiet: false)
           output_errors = verbose
           exit_on_first_error = !verbose
           check_result = Homebrew::Bundle::Checker.check(
@@ -24,9 +24,9 @@ def self.run(global: false, file: nil, no_upgrade: false, verbose: false)
             check_result.errors.each { |package| puts "#{ARROW} #{package}" } if output_errors
             puts "Satisfy missing dependencies with `brew bundle install`."
             exit 1
-          else
-            puts "The Brewfile's dependencies are satisfied."
           end
+
+          puts "The Brewfile's dependencies are satisfied." if !quiet
         end
       end
     end

Library/Homebrew/bundle/commands/exec.rb

@@ -47,7 +47,12 @@ module Exec
 
         PATH_LIKE_ENV_REGEX = /.+#{File::PATH_SEPARATOR}/
 
-        def self.run(*args, global: false, file: nil, subcommand: "")
+        def self.run(*args, global: false, file: nil, check: false, subcommand: "")
+          if check
+            require "bundle/commands/check"
+            Homebrew::Bundle::Commands::Check.run(global:, file:, quiet: true)
+          end
+
           # Cleanup Homebrew's global environment
           HOMEBREW_ENV_CLEANUP.each { |key| ENV.delete(key) }
 

Library/Homebrew/cmd/bundle.rb

@@ -51,15 +51,15 @@ class Bundle < AbstractCommand
           `brew bundle remove` <name> [...]:
           Remove entries that match `name` from your `Brewfile`. Use `--formula`, `--cask`, `--tap`, `--mas`, `--whalebrew` or `--vscode` to remove only entries of the corresponding type. Passing `--formula` also removes matches against formula aliases and old formula names.
 
-          `brew bundle exec` <command>:
+          `brew bundle exec` [--check] <command>:
           Run an external command in an isolated build environment based on the `Brewfile` dependencies.
 
           This sanitized build environment ignores unrequested dependencies, which makes sure that things you didn't specify in your `Brewfile` won't get picked up by commands like `bundle install`, `npm install`, etc. It will also add compiler flags which will help with finding keg-only dependencies like `openssl`, `icu4c`, etc.
 
-          `brew bundle sh`:
+          `brew bundle sh` [--check]:
           Run your shell in a `brew bundle exec` environment.
 
-          `brew bundle env`:
+          `brew bundle env` [--check]:
           Print the environment variables that would be set in a `brew bundle exec` environment.
         EOS
         flag "--file=",
@@ -119,6 +119,9 @@ class Bundle < AbstractCommand
                description: "`dump` does not add `restart_service` to formula lines."
         switch "--zap",
                description: "`cleanup` casks using the `zap` command instead of `uninstall`."
+        switch "--check",
+               description: "Check that all dependencies in the Brewfile are installed before " \
+                            "running `exec`, `sh`, or `env`."
 
         conflicts "--all", "--no-vscode"
         conflicts "--vscode", "--no-vscode"
@@ -127,6 +130,8 @@ class Bundle < AbstractCommand
         named_args %w[install dump cleanup check exec list sh env edit]
       end
 
+      BUNDLE_EXEC_COMMANDS = %w[exec sh env].freeze
+
       sig { override.void }
       def run
         # Keep this inside `run` to keep --help fast.
@@ -137,6 +142,10 @@ def run
           raise UsageError, "This command does not take more than 1 subcommand argument."
         end
 
+        if args.check? && BUNDLE_EXEC_COMMANDS.exclude?(subcommand)
+          raise UsageError, "`--check` can be used only with #{BUNDLE_EXEC_COMMANDS.join(", ")}."
+        end
+
         global = args.global?
         file = args.file
         args.zap?
@@ -211,7 +220,7 @@ def run
         when "check"
           require "bundle/commands/check"
           Homebrew::Bundle::Commands::Check.run(global:, file:, no_upgrade:, verbose:)
-        when "exec", "sh", "env"
+        when *BUNDLE_EXEC_COMMANDS
           named_args = case subcommand
           when "exec"
             _subcommand, *named_args = args.named