Fix qemu-vexpress and qemu-aarch64 (#1029)

* Don't ask for the mesa driver when the Qemu arch is not the
  native arch and always use swrast in that case
* qemu-vexpress: use LTS kernel
* qemu-aarch64: use drm-backend for weston

aports/device/device-qemu-aarch64/APKBUILD

 pkgname=device-qemu-aarch64
 pkgver=1
-pkgrel=8
+pkgrel=9
 pkgdesc="Simulated device in qemu with vexpress soc"
 url="https://github.com/postmarketOS"
 arch="noarch"
 license="MIT"
-depends="linux-postmarketos-stable mesa-dri-swrast"
+# NOTE: 'pmbootstrap init' allows you to choose the mesa-dri-* package
+depends="linux-postmarketos-stable"
 makedepends=""
-subpackages=""
-source="deviceinfo interfaces"
+subpackages="$pkgname-weston"
+source="deviceinfo interfaces weston.ini"
 options="!check"
 
 package() {
@@ -18,5 +19,13 @@ package() {
 		"$pkgdir"/etc/network/interfaces
 }
 
+weston() {
+    install_if="$pkgname weston"
+    install -Dm644 "$srcdir"/weston.ini \
+        "$subpkgdir"/etc/xdg/weston/weston.ini
+}
+
+
 sha512sums="8802ad301bffd10d79db938adecf4bbdf8293c8caefe5fce753c56f228a7212330318a0be9853a83442e8971bbc235269796fe66077c501d35a935df1d2ed90c  deviceinfo
-d510ca304066840aa5e6c4fc71ded1b7e83012c93837fa39e37bdb873b3636230030d56f7aa50c93fc688f563cb4cb96c02ad333bbc45a400c1ebee1792a9dd4  interfaces"
+d510ca304066840aa5e6c4fc71ded1b7e83012c93837fa39e37bdb873b3636230030d56f7aa50c93fc688f563cb4cb96c02ad333bbc45a400c1ebee1792a9dd4  interfaces
+df0fe900693e5f176076c59f5379e56aaa96c3df16a4120448f15b71f530170730b43e5fe32733c40c118a00ca3581043231a062a8a1eb0a930bfbfbb6c52a47  weston.ini"

aports/device/device-qemu-aarch64/weston.ini

+[core]
+xwayland=true
+backend=drm-backend.so

aports/device/device-qemu-vexpress/APKBUILD

 pkgname=device-qemu-vexpress
 pkgver=1
-pkgrel=15
+pkgrel=16
 pkgdesc="Simulated device in qemu with vexpress soc"
 url="https://github.com/postmarketOS"
 arch="noarch"
 license="MIT"
-depends="linux-postmarketos-stable mesa-dri-swrast"
+# NOTE: 'pmbootstrap init' allows you to choose the mesa-dri-* package
+depends="linux-postmarketos-lts"
 makedepends=""
 subpackages=""
 source="deviceinfo interfaces"

pmb/config/__init__.py

@@ -46,7 +46,7 @@ work_version = "1"
 
 # Only save keys to the config file, which we ask for in 'pmbootstrap init'.
 config_keys = ["ccache_size", "device", "extra_packages", "jobs", "keymap",
-               "qemu_mesa_driver", "timestamp_based_rebuild", "timezone",
+               "qemu_native_mesa_driver", "timestamp_based_rebuild", "timezone",
                "ui", "user", "work"]
 
 # Config file/commandline default values
@@ -72,7 +72,7 @@ defaults = {
     "mirror_alpine": "http://dl-cdn.alpinelinux.org/alpine/",
     "mirror_postmarketos": "http://postmarketos.brixit.nl",
     "port_distccd": "33632",
-    "qemu_mesa_driver": "dri-virtio",
+    "qemu_native_mesa_driver": "dri-virtio",
     "timestamp_based_rebuild": True,
     "timezone": "GMT",
     "ui": "weston",
@@ -383,4 +383,4 @@ aportgen = {
 #
 # QEMU
 #
-qemu_mesa_drivers = ["dri-swrast", "dri-virtio"]
+qemu_native_mesa_drivers = ["dri-swrast", "dri-virtio"]

pmb/config/init.py

@@ -81,7 +81,7 @@ def ask_for_ui(args):
 
 
 def ask_for_keymaps(args, device):
-    info = pmb.parse.deviceinfo(args, device=device)
+    info = pmb.parse.deviceinfo(args, device)
     if "keymaps" not in info or info["keymaps"].strip() == "":
         return ""
     options = info["keymaps"].split(' ')
@@ -147,18 +147,23 @@ def ask_for_device(args):
     return (device, device_exists)
 
 
-def ask_for_qemu_mesa_driver(args):
-    drivers = pmb.config.qemu_mesa_drivers
-    logging.info("Which mesa driver do you prefer for your Qemu device? Only"
-                 " select something other than the default if you are having"
-                 " graphical problems (such as glitches).")
+def ask_for_qemu_native_mesa_driver(args, device, arch_native):
+    # Native Qemu device selected? (e.g. qemu-amd64 on x86_64)
+    if not pmb.parse.arch.qemu_check_device(device, arch_native):
+        return None
+
+    drivers = pmb.config.qemu_native_mesa_drivers
+    logging.info("Which mesa driver do you prefer for your native Qemu device?"
+                 " Only select something other than the default if you are"
+                 " having graphical problems (such as glitches).")
     while True:
         ret = pmb.helpers.cli.ask(args, "Mesa driver", drivers,
-                                  args.qemu_mesa_driver)
+                                  args.qemu_native_mesa_driver)
         if ret in drivers:
             return ret
         logging.fatal("ERROR: Please specify a driver from the list. To change"
-                      " it, see qemu_mesa_drivers in pmb/config/__init__.py.")
+                      " it, see qemu_native_mesa_drivers in"
+                      " pmb/config/__init__.py.")
 
 
 def ask_for_build_options(args, cfg):
@@ -205,16 +210,18 @@ def frontend(args):
     cfg["pmbootstrap"]["work"] = args.work = ask_for_work_path(args)
 
     # Device
-    cfg["pmbootstrap"]["device"], device_exists = ask_for_device(args)
+    device, device_exists = ask_for_device(args)
+    cfg["pmbootstrap"]["device"] = device
 
     # Qemu mesa driver
     if cfg["pmbootstrap"]["device"].startswith("qemu-"):
-        cfg["pmbootstrap"]["qemu_mesa_driver"] = ask_for_qemu_mesa_driver(args)
+        driver = ask_for_qemu_native_mesa_driver(args, device, args.arch_native)
+        if driver:
+            cfg["pmbootstrap"]["qemu_native_mesa_driver"] = driver
 
     # Device keymap
     if device_exists:
-        cfg["pmbootstrap"]["keymap"] = ask_for_keymaps(
-            args, device=cfg["pmbootstrap"]["device"])
+        cfg["pmbootstrap"]["keymap"] = ask_for_keymaps(args, device)
 
     # Username
     cfg["pmbootstrap"]["user"] = pmb.helpers.cli.ask(args, "Username", None,
@@ -243,8 +250,8 @@ def frontend(args):
     if (device_exists and
             len(glob.glob(args.work + "/chroot_*")) and
             pmb.helpers.cli.confirm(args, "Zap existing chroots to apply configuration?", default=True)):
-        setattr(args, "deviceinfo", pmb.parse.deviceinfo(
-            args, device=cfg["pmbootstrap"]["device"]))
+        setattr(args, "deviceinfo", pmb.parse.deviceinfo(args, device=device))
+
         # Do not zap any existing packages or cache_http directories
         pmb.chroot.zap(args, confirm=False)
 

pmb/install/install.py

@@ -308,7 +308,7 @@ def install(args):
     if args.add:
         install_packages += args.add.split(",")
     if args.device.startswith("qemu-"):
-        install_packages += ["mesa-" + args.qemu_mesa_driver]
+        install_packages += ["mesa-" + args.qemu_native_mesa_driver]
     for pkgname in install_packages:
         pmb.build.package(args, pkgname, args.deviceinfo["arch"])
 

pmb/parse/arch.py

@@ -159,3 +159,16 @@ def qemu_to_pmos_device(arch):
 
     raise ValueError("Can not map QEMU value '" + arch + "'"
                      " to the right postmarketOS device")
+
+
+def qemu_check_device(device, arch):
+    """
+    Check whether a device has a specific architecture.
+
+    Examples:
+        qemu_check_device("qemu-amd64", "x86_64") is True
+        qemu_check_device("qemu-vexpress", "armel") is True
+        qemu_check_device("qemu-vexpress", "aarch64") is False
+    """
+    arch_qemu = uname_to_qemu(arch)
+    return device == qemu_to_pmos_device(arch_qemu)

pmb/qemu/run.py

@@ -157,12 +157,12 @@ def command_qemu(args, arch, device, img_path, spice_enabled):
         raise RuntimeError("Architecture {} not supported by this command yet.".format(arch))
 
     # Kernel Virtual Machine (KVM) support
-    enable_kvm = True
+    native = True
     if args.arch:
         arch1 = pmb.parse.arch.uname_to_qemu(args.arch_native)
         arch2 = pmb.parse.arch.uname_to_qemu(args.arch)
-        enable_kvm = (arch1 == arch2)
-    if enable_kvm and os.path.exists("/dev/kvm"):
+        native = (arch1 == arch2)
+    if native and os.path.exists("/dev/kvm"):
         command += ["-enable-kvm"]
     else:
         logging.info("WARNING: Qemu is not using KVM and will run slower!")
@@ -174,7 +174,7 @@ def command_qemu(args, arch, device, img_path, spice_enabled):
                     "port=" + args.spice_port + ",addr=127.0.0.1" +
                     ",disable-ticketing"]
     else:
-        if args.qemu_mesa_driver == "dri-virtio":
+        if native and args.qemu_native_mesa_driver == "dri-virtio":
             command += ["-vga", "virtio"]
         command += ["-display", args.qemu_display]
 

test/test_questions.py

@@ -140,10 +140,11 @@ def test_questions(args, monkeypatch, tmpdir):
     assert func(args, "nokia-rx51") == "us/rx51_us"
     assert func(args, "lg-mako") == ""
 
-    # Qemu mesa driver
-    func = pmb.config.init.ask_for_qemu_mesa_driver
+    # Qemu native mesa driver
+    func = pmb.config.init.ask_for_qemu_native_mesa_driver
     answers = ["invalid_driver", "dri-swrast"]
-    assert func(args) == "dri-swrast"
+    assert func(args, "qemu-amd64", "x86_64") == "dri-swrast"
+    assert func(args, "qemu-aarch64", "x86_64") is None
 
     # UI
     answers = ["invalid_UI", "weston"]