forked from Mirror/pmbootstrap
f536fd9cb9
When using pmbootstrap, you usually select the device you want to work on using 'pmbootstrap init', generate the rootfs and can then run more commands in the context of the device. The same needs to be done before using QEMU (to generate the rootfs). But for some reason 'pmbootstrap qemu' requires setting the --arch parameter when running QEMU for a foreign architecture, even when the device is still selected in pmbootstrap. Even more confusing is that setting "--arch arm" always selects device-qemu-vexpress, but this is not immediately clear from the name. Let's make this a lot more intuitive by making sure there is a QEMU device selected when running 'pmbootstrap qemu'. We can then use the device information to infer the architecture automatically.
280 lines
10 KiB
Python
280 lines
10 KiB
Python
# Copyright 2020 Pablo Castellano, Oliver Smith
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# SPDX-License-Identifier: GPL-3.0-or-later
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import logging
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import os
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import re
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import signal
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import shlex
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import shutil
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import pmb.build
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import pmb.chroot
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import pmb.chroot.apk
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import pmb.chroot.other
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import pmb.chroot.initfs
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import pmb.config
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import pmb.helpers.run
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import pmb.parse.arch
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def system_image(args):
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"""
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Returns path to rootfs for specified device. In case that it doesn't
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exist, raise and exception explaining how to generate it.
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"""
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path = args.work + "/chroot_native/home/pmos/rootfs/" + args.device + ".img"
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if not os.path.exists(path):
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logging.debug("Could not find rootfs: " + path)
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raise RuntimeError("The rootfs has not been generated yet, please "
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"run 'pmbootstrap install' first.")
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return path
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def which_qemu(args, arch):
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"""
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Finds the qemu executable or raises an exception otherwise
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"""
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executable = "qemu-system-" + arch
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if shutil.which(executable):
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return executable
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else:
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raise RuntimeError("Could not find the '" + executable + "' executable"
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" in your PATH. Please install it in order to"
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" run qemu.")
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def create_gdk_loader_cache(args):
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"""
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Create a gdk loader cache that can be used for running GTK UIs outside of
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the chroot.
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"""
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gdk_cache_dir = "/usr/lib/gdk-pixbuf-2.0/2.10.0/"
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custom_cache_path = gdk_cache_dir + "loaders-pmos-chroot.cache"
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rootfs_native = args.work + "/chroot_native"
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if os.path.isfile(rootfs_native + custom_cache_path):
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return rootfs_native + custom_cache_path
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cache_path = gdk_cache_dir + "loaders.cache"
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if not os.path.isfile(rootfs_native + cache_path):
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raise RuntimeError("gdk pixbuf cache file not found: " + cache_path)
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pmb.chroot.root(args, ["cp", cache_path, custom_cache_path])
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cmd = ["sed", "-i", "-e",
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"s@\"" + gdk_cache_dir + "@\"" + rootfs_native + gdk_cache_dir + "@",
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custom_cache_path]
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pmb.chroot.root(args, cmd)
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return rootfs_native + custom_cache_path
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def command_qemu(args, arch, img_path):
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"""
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Generate the full qemu command with arguments to run postmarketOS
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"""
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cmdline = args.deviceinfo["kernel_cmdline"]
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if args.cmdline:
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cmdline = args.cmdline
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logging.debug("Kernel cmdline: " + cmdline)
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port_ssh = str(args.port)
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port_telnet = str(args.port + 1)
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suffix = "rootfs_" + args.device
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rootfs = args.work + "/chroot_" + suffix
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if args.flavor:
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flavor = args.flavor
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else:
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flavor = pmb.chroot.other.kernel_flavors_installed(args, suffix)[0]
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if args.host_qemu:
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qemu_bin = which_qemu(args, arch)
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env = {}
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command = [qemu_bin]
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else:
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rootfs_native = args.work + "/chroot_native"
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env = {"QEMU_MODULE_DIR": rootfs_native + "/usr/lib/qemu",
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"GBM_DRIVERS_PATH": rootfs_native + "/usr/lib/xorg/modules/dri",
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"LIBGL_DRIVERS_PATH": rootfs_native + "/usr/lib/xorg/modules/dri"}
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if "gtk" in args.qemu_display:
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gdk_cache = create_gdk_loader_cache(args)
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env.update({"GTK_THEME": "Default",
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"GDK_PIXBUF_MODULE_FILE": gdk_cache,
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"XDG_DATA_DIRS": rootfs_native + "/usr/local/share:" +
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rootfs_native + "/usr/share"})
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command = [rootfs_native + "/lib/ld-musl-" +
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args.arch_native + ".so.1"]
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command += ["--library-path=" + rootfs_native + "/lib:" +
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rootfs_native + "/usr/lib:" +
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rootfs_native + "/usr/lib/pulseaudio"]
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command += [rootfs_native + "/usr/bin/qemu-system-" + arch]
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command += ["-L", rootfs_native + "/usr/share/qemu/"]
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command += ["-kernel", rootfs + "/boot/vmlinuz-" + flavor]
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command += ["-initrd", rootfs + "/boot/initramfs-" + flavor]
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command += ["-append", shlex.quote(cmdline)]
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command += ["-m", str(args.memory)]
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command += ["-netdev",
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"user,id=net0,"
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"hostfwd=tcp::" + port_ssh + "-:22,"
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"hostfwd=tcp::" + port_telnet + "-:23"
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",net=172.16.42.0/24,dhcpstart=" + pmb.config.default_ip
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]
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command += ["-show-cursor"]
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if args.deviceinfo["dtb"] != "":
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dtb_image = rootfs + "/usr/share/dtb/" + args.deviceinfo["dtb"] + ".dtb"
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if not os.path.exists(dtb_image):
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raise RuntimeError("DTB file not found: " + dtb_image)
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command += ["-dtb", dtb_image]
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smp = os.cpu_count()
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if arch == "x86_64":
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command += ["-vga", "virtio"]
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command += ["-serial", "stdio"]
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command += ["-drive", "file=" + img_path + ",format=raw"]
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command += ["-device", "e1000,netdev=net0"]
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elif arch == "arm":
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command += ["-M", "vexpress-a9"]
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command += ["-sd", img_path]
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command += ["-device", "virtio-net-device,netdev=net0"]
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smp = min(smp, 4)
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elif arch == "aarch64":
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command += ["-M", "virt"]
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command += ["-cpu", "cortex-a57"]
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command += ["-device", "virtio-gpu-pci"]
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command += ["-device", "virtio-net-device,netdev=net0"]
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command += ["-usb", "-device", "usb-ehci",
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"-device", "usb-kbd", "-device", "usb-mouse"]
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# Add storage
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command += ["-device", "virtio-blk-device,drive=system"]
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command += ["-drive", "if=none,id=system,file={},id=hd0".format(img_path)]
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else:
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raise RuntimeError("Architecture {} not supported by this command yet.".format(arch))
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command += ["-smp", str(smp)]
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# Kernel Virtual Machine (KVM) support
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native = args.arch_native == args.deviceinfo["arch"]
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if native and os.path.exists("/dev/kvm"):
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command += ["-enable-kvm"]
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else:
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logging.info("WARNING: QEMU is not using KVM and will run slower!")
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display = args.qemu_display
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if display != "none":
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display += ",gl=" + ("on" if args.qemu_gl else "off")
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command += ["-display", display]
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# Audio support
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if args.qemu_audio:
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command += ["-audiodev", args.qemu_audio + ",id=audio"]
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command += ["-soundhw", "hda"]
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return (command, env)
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def resize_image(args, img_size_new, img_path):
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"""
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Truncates the rootfs to a specific size. The value must be larger than the
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current image size, and it must be specified in MiB or GiB units (powers of 1024).
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:param img_size_new: new image size in M or G
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:param img_path: the path to the rootfs
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"""
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# Current image size in bytes
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img_size = os.path.getsize(img_path)
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# Make sure we have at least 1 integer followed by either M or G
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pattern = re.compile("^[0-9]+[M|G]$")
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if not pattern.match(img_size_new):
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raise RuntimeError("You must specify the rootfs size in [M]iB or [G]iB, e.g. 2048M or 2G")
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# Remove M or G and convert to bytes
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img_size_new_bytes = int(img_size_new[:-1]) * 1024 * 1024
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# Convert further for G
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if (img_size_new[-1] == "G"):
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img_size_new_bytes = img_size_new_bytes * 1024
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if (img_size_new_bytes >= img_size):
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logging.info("Setting the rootfs size to " + img_size_new)
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pmb.helpers.run.root(args, ["truncate", "-s", img_size_new, img_path])
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else:
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# Convert to human-readable format
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# NOTE: We convert to M here, and not G, so that we don't have to display
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# a size like 1.25G, since decimal places are not allowed by truncate.
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# We don't want users thinking they can use decimal numbers, and so in
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# this example, they would need to use a size greater then 1280M instead.
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img_size_str = str(round(img_size / 1024 / 1024)) + "M"
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raise RuntimeError("The rootfs size must be " + img_size_str + " or greater")
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def sigterm_handler(number, frame):
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raise RuntimeError("pmbootstrap was terminated by another process,"
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" and killed the QEMU VM it was running.")
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def install_depends(args, arch):
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"""
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Install any necessary qemu dependencies in native chroot
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"""
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depends = ["qemu", "qemu-system-" + arch, "qemu-ui-sdl", "qemu-ui-gtk",
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"mesa-gl", "mesa-egl", "mesa-dri-classic", "mesa-dri-gallium",
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"qemu-audio-alsa", "qemu-audio-pa", "qemu-audio-sdl"]
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pmb.chroot.apk.install(args, depends)
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def run(args):
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"""
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Run a postmarketOS image in qemu
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"""
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if not args.device.startswith("qemu-"):
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raise RuntimeError("'pmbootstrap qemu' can be only used with one of "
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"the QEMU device packages. Run 'pmbootstrap init' "
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"and select the 'qemu' vendor.")
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arch = pmb.parse.arch.alpine_to_qemu(args.deviceinfo["arch"])
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img_path = system_image(args)
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if not args.host_qemu:
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install_depends(args, arch)
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logging.info("Running postmarketOS in QEMU VM (" + arch + ")")
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qemu, env = command_qemu(args, arch, img_path)
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# Workaround: QEMU runs as local user and needs write permissions in the
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# rootfs, which is owned by root
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if not os.access(img_path, os.W_OK):
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pmb.helpers.run.root(args, ["chmod", "666", img_path])
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# Resize the rootfs (or show hint)
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if args.image_size:
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resize_image(args, args.image_size, img_path)
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else:
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logging.info("NOTE: Run 'pmbootstrap qemu --image-size 2G' to set"
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" the rootfs size when you run out of space!")
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# SSH/telnet hints
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logging.info("Connect to the VM (telnet requires 'pmbootstrap initfs"
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" hook_add debug-shell'):")
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logging.info("* (ssh) ssh -p {port} {user}@localhost".format(**vars(args)))
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logging.info("* (telnet) telnet localhost " + str(args.port + 1))
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# Run QEMU and kill it together with pmbootstrap
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process = None
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try:
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signal.signal(signal.SIGTERM, sigterm_handler)
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process = pmb.helpers.run.user(args, qemu, output="interactive", env=env)
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except KeyboardInterrupt:
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# Don't show a trace when pressing ^C
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pass
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finally:
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if process:
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process.terminate()
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