Allow compressing lima-guestagent with gzip

Signed-off-by: Anders F Björklund <[email protected]>

Kconfig

@@ -30,3 +30,9 @@ config GUESTAGENT_ARCH_RISCV64
 	help
 		Build lima-guestagent for "riscv64" Arch
 	default y
+
+config GUESTAGENT_COMPRESS
+	bool "guestagent compress"
+	help
+		Compress lima-guestagent
+	default n

Makefile

@@ -86,22 +86,26 @@ HELPERS = \
 	_output/bin/podman.lima \
 	_output/bin/kubectl.lima
 
+ifeq ($(CONFIG_GUESTAGENT_COMPRESS),y)
+gz = .gz
+endif
+
 ifeq ($(CONFIG_GUESTAGENT_OS_LINUX),y)
 ifeq ($(CONFIG_GUESTAGENT_ARCH_X8664),y)
 GUESTAGENT += \
-	_output/share/lima/lima-guestagent.Linux-x86_64
+	_output/share/lima/lima-guestagent.Linux-x86_64$(gz)
 endif
 ifeq ($(CONFIG_GUESTAGENT_ARCH_AARCH64),y)
 GUESTAGENT += \
-	_output/share/lima/lima-guestagent.Linux-aarch64
+	_output/share/lima/lima-guestagent.Linux-aarch64$(gz)
 endif
 ifeq ($(CONFIG_GUESTAGENT_ARCH_ARMV7L),y)
 GUESTAGENT += \
-	_output/share/lima/lima-guestagent.Linux-armv7l
+	_output/share/lima/lima-guestagent.Linux-armv7l$(gz)
 endif
 ifeq ($(CONFIG_GUESTAGENT_ARCH_RISCV64),y)
 GUESTAGENT += \
-	_output/share/lima/lima-guestagent.Linux-riscv64
+	_output/share/lima/lima-guestagent.Linux-riscv64$(gz)
 endif
 endif
 
@@ -188,6 +192,9 @@ _output/share/lima/lima-guestagent.Linux-riscv64:
 	GOOS=linux GOARCH=riscv64 CGO_ENABLED=0 $(GO_BUILD) -o $@ ./cmd/lima-guestagent
 	chmod 644 $@
 
+_output/share/lima/lima-guestagent.%.gz: _output/share/lima/lima-guestagent.%
+	gzip $<
+
 .PHONY: manpages
 manpages: _output/bin/limactl$(exe)
 	@mkdir -p _output/share/man/man1

config.mk

@@ -3,3 +3,4 @@ CONFIG_GUESTAGENT_ARCH_X8664=y
 CONFIG_GUESTAGENT_ARCH_AARCH64=y
 CONFIG_GUESTAGENT_ARCH_ARMV7L=y
 CONFIG_GUESTAGENT_ARCH_RISCV64=y
+CONFIG_GUESTAGENT_COMPRESS=n

pkg/cidata/cidata.go

@@ -345,7 +345,7 @@ func GenerateISO9660(instDir, name string, y *limayaml.LimaYAML, udpDNSLocalPort
 	if err != nil {
 		return err
 	}
-	guestAgent, err := os.Open(guestAgentBinary)
+	guestAgent, err := usrlocalsharelima.Open(guestAgentBinary)
 	if err != nil {
 		return err
 	}

pkg/usrlocalsharelima/usrlocalsharelima.go

@@ -1,14 +1,17 @@
 package usrlocalsharelima
 
 import (
+	"compress/gzip"
 	"errors"
 	"fmt"
+	"io"
 	"io/fs"
 	"os"
 	"path/filepath"
 	"runtime"
 
 	"github.com/lima-vm/lima/pkg/limayaml"
+	"github.com/sirupsen/logrus"
 )
 
 func Dir() (string, error) {
@@ -55,6 +58,11 @@ func Dir() (string, error) {
 		} else if !errors.Is(err, os.ErrNotExist) {
 			return "", err
 		}
+		if _, err := os.Stat(gaCandidate + ".gz"); err == nil {
+			return filepath.Dir(gaCandidate), nil
+		} else if !errors.Is(err, os.ErrNotExist) {
+			return "", err
+		}
 	}
 
 	return "", fmt.Errorf("failed to find \"lima-guestagent.%s-%s\" binary for %q, attempted %v",
@@ -74,3 +82,19 @@ func GuestAgentBinary(ostype limayaml.OS, arch limayaml.Arch) (string, error) {
 	}
 	return filepath.Join(dir, "lima-guestagent."+ostype+"-"+arch), nil
 }
+
+func Open(path string) (io.ReadCloser, error) {
+	reader, err := os.Open(path)
+	if errors.Is(err, os.ErrNotExist) {
+		reader, err := os.Open(path + ".gz")
+		if err != nil {
+			return nil, err
+		}
+		logrus.Debugf("Decompressing %s.gz", path)
+		return gzip.NewReader(reader)
+	}
+	if err != nil {
+		return nil, err
+	}
+	return reader, nil
+}