Add yq subcommands to limactl and lima-guestagent

Adding it to `lima-guestagent` allows us to use `yq` in provisioning
scripts without having to install it from a package repository or
downloading it from GitHub.

Adding it to `limactl` makes it available to integration tests without
having to install it. It is essentially free because we already use
`yqlib` inside `limactl` anyways, , so the executable size doesn't
really change.

The size of the (compressed) guestagent for aarch64 increases from
12MB to 14MB, which seems acceptable.

These are "hidden" commands that don't show up in --help output.

Signed-off-by: Jan Dubois <jan.dubois@suse.com>

Author: jandubois

LICENSE_YQ

@@ -0,0 +1,30 @@
+Below is a copy of https://github.com/mikefarah/yq/blob/master/LICENSE
+
+This file is included in the Lima repository because `limactl yq` and
+`lima-hostagent yq` provide an embedded version of the `yq` utility.
+This license applies specifically to the embedded `yq` functionality;
+the rest of this repository is licensed under Apache 2.0.
+
+------------------------------------------------------------------------------
+
+The MIT License (MIT)
+
+Copyright (c) 2017 Mike Farah
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

cmd/lima-guestagent/main_linux.go

@@ -4,16 +4,40 @@
 package main
 
 import (
+	"os"
 	"strings"
 
+	yq "github.com/mikefarah/yq/v4/cmd"
 	"github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 
 	"github.com/lima-vm/lima/v2/pkg/debugutil"
 	"github.com/lima-vm/lima/v2/pkg/version"
 )
 
+// yqmain is a copy of main() in https://github.com/mikefarah/yq/blob/master/yq.go
+func yqmain() {
+	cmd := yq.New()
+	args := os.Args[1:]
+	_, _, err := cmd.Find(args)
+	if err != nil && args[0] != "__complete" {
+		// default command when nothing matches...
+		newArgs := []string{"eval"}
+		cmd.SetArgs(append(newArgs, os.Args[1:]...))
+	}
+	if err := cmd.Execute(); err != nil {
+		os.Exit(1) //nolint:revive // it's intentional to call os.Exit in this function
+	}
+}
+
 func main() {
+	// `lima-guestagent yq` executes the embedded `yq` command instead.
+	if len(os.Args) > 1 && os.Args[1] == "yq" {
+		os.Args = os.Args[1:]
+		yqmain()
+		return
+	}
+
 	if err := newApp().Execute(); err != nil {
 		logrus.Fatal(err)
 	}

cmd/limactl/main.go

@@ -14,6 +14,7 @@ import (
 	"strings"
 
 	"github.com/mattn/go-isatty"
+	yq "github.com/mikefarah/yq/v4/cmd"
 	"github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 
@@ -31,7 +32,28 @@ const (
 	advancedCommand     = "advanced"
 )
 
+// yqmain is a copy of main() in https://github.com/mikefarah/yq/blob/master/yq.go
+func yqmain() {
+	cmd := yq.New()
+	args := os.Args[1:]
+	_, _, err := cmd.Find(args)
+	if err != nil && args[0] != "__complete" {
+		// default command when nothing matches...
+		newArgs := []string{"eval"}
+		cmd.SetArgs(append(newArgs, os.Args[1:]...))
+	}
+	if err := cmd.Execute(); err != nil {
+		os.Exit(1) //nolint:revive // it's intentional to call os.Exit in this function
+	}
+}
+
 func main() {
+	// `limactl yq` executes the embedded `yq` command instead.
+	if len(os.Args) > 1 && os.Args[1] == "yq" {
+		os.Args = os.Args[1:]
+		yqmain()
+		return
+	}
 	if runtime.GOOS == "windows" {
 		extras, hasExtra := os.LookupEnv("_LIMA_WINDOWS_EXTRA_PATH")
 		if hasExtra && strings.TrimSpace(extras) != "" {