vm/qemu: default target dir to /

Everybody except for fuchsia use /.
Does not make sense to repeat for everybody.

1 files changed, 32 insertions, 40 deletions

diff --git a/vm/qemu/qemu.go b/vm/qemu/qemu.go
index 15b8e0854..d0310219f 100644
--- a/vm/qemu/qemu.go
+++ b/vm/qemu/qemu.go
@@ -94,7 +94,7 @@ type instance struct {
 type archConfig struct {
 	Qemu      string
 	QemuArgs  string
-	TargetDir string
+	TargetDir string // "/" by default
 	NetDev    string // default network device type (see the full list with qemu-system-x86_64 -device help)
 	// UseNewQemuImageOptions specifies whether the arch uses "new" QEMU image device options.
 	UseNewQemuImageOptions bool
@@ -103,9 +103,8 @@ type archConfig struct {
 
 var archConfigs = map[string]*archConfig{
 	"linux/amd64": {
-		Qemu:      "qemu-system-x86_64",
-		QemuArgs:  "-enable-kvm -cpu host,migratable=off",
-		TargetDir: "/",
+		Qemu:     "qemu-system-x86_64",
+		QemuArgs: "-enable-kvm -cpu host,migratable=off",
 		// e1000e fails on recent Debian distros with:
 		// Initialization of device e1000e failed: failed to find romfile "efi-e1000e.rom
 		// But other arches don't use e1000e, e.g. arm64 uses virtio by default.
@@ -128,53 +127,47 @@ var archConfigs = map[string]*archConfig{
 		),
 	},
 	"linux/386": {
-		Qemu:      "qemu-system-i386",
-		TargetDir: "/",
-		NetDev:    "e1000",
+		Qemu:   "qemu-system-i386",
+		NetDev: "e1000",
 		CmdLine: append(linuxCmdline,
 			"root=/dev/sda",
 			"console=ttyS0",
 		),
 	},
 	"linux/arm64": {
-		Qemu:      "qemu-system-aarch64",
-		QemuArgs:  "-machine virt,virtualization=on -cpu cortex-a57",
-		TargetDir: "/",
-		NetDev:    "virtio-net-pci",
+		Qemu:     "qemu-system-aarch64",
+		QemuArgs: "-machine virt,virtualization=on -cpu cortex-a57",
+		NetDev:   "virtio-net-pci",
 		CmdLine: append(linuxCmdline,
 			"root=/dev/vda",
 			"console=ttyAMA0",
 		),
 	},
 	"linux/arm": {
-		Qemu:      "qemu-system-arm",
-		TargetDir: "/",
-		NetDev:    "virtio-net-pci",
+		Qemu:   "qemu-system-arm",
+		NetDev: "virtio-net-pci",
 		CmdLine: append(linuxCmdline,
 			"root=/dev/vda",
 			"console=ttyAMA0",
 		),
 	},
 	"linux/mips64le": {
-		Qemu:      "qemu-system-mips64el",
-		TargetDir: "/",
-		QemuArgs:  "-M malta -cpu MIPS64R2-generic -nodefaults",
-		NetDev:    "e1000",
+		Qemu:     "qemu-system-mips64el",
+		QemuArgs: "-M malta -cpu MIPS64R2-generic -nodefaults",
+		NetDev:   "e1000",
 		CmdLine: append(linuxCmdline,
 			"root=/dev/sda",
 			"console=ttyS0",
 		),
 	},
 	"linux/ppc64le": {
-		Qemu:      "qemu-system-ppc64",
-		TargetDir: "/",
-		QemuArgs:  "-enable-kvm -vga none",
-		NetDev:    "virtio-net-pci",
-		CmdLine:   linuxCmdline,
+		Qemu:     "qemu-system-ppc64",
+		QemuArgs: "-enable-kvm -vga none",
+		NetDev:   "virtio-net-pci",
+		CmdLine:  linuxCmdline,
 	},
 	"linux/riscv64": {
 		Qemu:                   "qemu-system-riscv64",
-		TargetDir:              "/",
 		QemuArgs:               "-machine virt",
 		NetDev:                 "virtio-net-pci",
 		UseNewQemuImageOptions: true,
@@ -184,25 +177,22 @@ var archConfigs = map[string]*archConfig{
 		),
 	},
 	"linux/s390x": {
-		Qemu:      "qemu-system-s390x",
-		TargetDir: "/",
-		QemuArgs:  "-M s390-ccw-virtio -cpu max,zpci=on",
-		NetDev:    "virtio-net-pci",
+		Qemu:     "qemu-system-s390x",
+		QemuArgs: "-M s390-ccw-virtio -cpu max,zpci=on",
+		NetDev:   "virtio-net-pci",
 		CmdLine: append(linuxCmdline,
 			"root=/dev/vda",
 		),
 	},
 	"freebsd/amd64": {
-		Qemu:      "qemu-system-x86_64",
-		TargetDir: "/",
-		QemuArgs:  "-enable-kvm",
-		NetDev:    "e1000",
+		Qemu:     "qemu-system-x86_64",
+		QemuArgs: "-enable-kvm",
+		NetDev:   "e1000",
 	},
 	"netbsd/amd64": {
-		Qemu:      "qemu-system-x86_64",
-		TargetDir: "/",
-		QemuArgs:  "-enable-kvm",
-		NetDev:    "e1000",
+		Qemu:     "qemu-system-x86_64",
+		QemuArgs: "-enable-kvm",
+		NetDev:   "e1000",
 	},
 	"fuchsia/amd64": {
 		Qemu:      "qemu-system-x86_64",
@@ -215,10 +205,9 @@ var archConfigs = map[string]*archConfig{
 		},
 	},
 	"akaros/amd64": {
-		Qemu:      "qemu-system-x86_64",
-		QemuArgs:  "-enable-kvm -cpu host,migratable=off",
-		TargetDir: "/",
-		NetDev:    "e1000",
+		Qemu:     "qemu-system-x86_64",
+		QemuArgs: "-enable-kvm -cpu host,migratable=off",
+		NetDev:   "e1000",
 	},
 }
 
@@ -519,6 +508,9 @@ func (inst *instance) targetDir() string {
 	if inst.image == "9p" {
 		return "/tmp"
 	}
+	if inst.archConfig.TargetDir == "" {
+		return "/"
+	}
 	return inst.archConfig.TargetDir
 }