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vlasakmvlasakm
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tools: labs: qemu: Add run-qemu.sh as alternative
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‎tools/labs/.gitignore

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Original file line numberDiff line numberDiff line change
@@ -6,5 +6,7 @@ rootfs.img
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disk1.img
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disk2.img
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/*core-image-*.ext4
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/*core-image-*.bz2
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.modinst
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/out/
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rootfs

‎tools/labs/qemu/Makefile

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@@ -95,4 +95,41 @@ clean::
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-rm -f disk1.img disk2.img
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-rm -f pipe1.in pipe1.out pipe2.in pipe2.out
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.PHONY: boot gdb clean tap0 tap1
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# Run with one of the following:
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# make -j$(nproc) console
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# make -j$(nproc) gui
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# Attach debugger with
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# make gdb
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# Stop with
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# sync # make sure all filesystem changes are propagated
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# CTRL-A X # kill qemu, faster and more reliable than poweroff etc.
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# Compile in skel directories with something like:
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# alias kmake='make -C "$HOME/src/linux/" M="$(pwd)"'
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# kmake
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YOCTO_ROOTFS = core-image-minimal-qemu$(ARCH).tar.bz2
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console: $(ZIMAGE) rootfs
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MODE=console qemu/run-qemu.sh
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gui:
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MODE=gui qemu/run-qemu.sh
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rootfs: $(YOCTO_ROOTFS)
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mkdir -p rootfs
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tar -xf core-image-minimal-qemux86.tar.bz2 -C rootfs
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sed -i 's@/sbin/getty@& -n -l "/sbin/rootlogin"@' rootfs/bin/start_getty
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printf '%s\n' '#!/bin/sh' '/bin/login -f root' > rootfs/sbin/rootlogin
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chmod +x rootfs/sbin/rootlogin
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mkdir -p rootfs/home/root/skels
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echo "//10.0.2.2/skels /home/root/skels cifs port=4450,guest,user=dummy 0 0" >> rootfs/etc/fstab
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$(YOCTO_ROOTFS):
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wget $(YOCTO_URL)/$(YOCTO_ROOTFS)
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.PHONY: console gui boot gdb clean tap0 tap1

‎tools/labs/qemu/kernel_config.x86

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@@ -97,3 +97,18 @@ CONFIG_UPROBE_EVENTS=y
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CONFIG_LOCKDEP=y
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# kernel lock tracing:
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CONFIG_LOCK_STAT=y
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# for qemu serial console ttyS0:
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CONFIG_SERIAL_8250=y
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CONFIG_SERIAL_8250_CONSOLE=y
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# for qemu default netdev:
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CONFIG_E1000=y
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# for CIFS/SMB/samba rootfs and share
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CONFIG_IP_PNP=y
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CONFIG_IP_PNP_DHCP=y
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CONFIG_CIFS=y
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CONFIG_CIFS_XATTR=y
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CONFIG_CIFS_POSIX=y
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CONFIG_CIFS_ROOT=y

‎tools/labs/qemu/run-qemu.sh

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@@ -0,0 +1,114 @@
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#!/bin/bash
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die() { echo "$0: error: $@" >&2; exit 1; }
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script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" > /dev/null && pwd)"
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base_dir=${ROOT:-"$(readlink -f "$script_dir/..")"}
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arch=${ARCH:-"x86"}
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kernel=${ZIMAGE:-"$(readlink -f "$base_dir/../../arch/$arch/boot/bzImage")"}
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rootfs=${ROOTFS:-"$(readlink -f "$base_dir/rootfs")"}
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skels=${SKELS:-"$(readlink -f "$base_dir/skels")"}
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mode="${MODE:-console}"
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case "$mode" in
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console)
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qemu_display="-nographic"
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linux_console="console=ttyS0"
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;;
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gui)
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# QEMU_DISPLAY = sdl, gtk, ...
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qemu_display="-display ${QEMU_DISPLAY:-"sdl"}"
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linux_console=""
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;;
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*) echo "unknown mode '$MODE'" >&2; exit 1 ;;
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esac
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case "$arch" in
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x86) qemu_arch=i386 ;;
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arm) qemu_arch=arm ;;
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*) echo "unknown architecture '$arch'" >&2; exit 1 ;;
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esac
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smbd=${SMBD:-"smbd"}
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qemu=${QEMU:-"qemu-system-$qemu_arch"}
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qemu_kvm=${QEMU_KVM:-"-enable-kvm -cpu host"}
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qemu_cpus=${QEMU_CPUS:-"1"}
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qemu_mem=${QEMU_MEM:-"512"}
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qemu_display=${QEMU_DISPLAY:-"$qemu_display"}
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qemu_addopts=${QEMU_ADD_OPTS:-""}
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linux_console=${LINUX_CONSOLE:-"$linux_console"}
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linux_loglevel=${LINUX_LOGLEVEL:-"15"}
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linux_term=${LINUX_TERM:-"TERM=xterm"}
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linux_addcmdline=${LINUX_ADD_CMDLINE:-""}
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linux_cmdline=${LINUX_CMDLINE:-"root=/dev/cifs rw ip=dhcp cifsroot=//10.0.2.2/rootfs,port=4450,guest,user=dummy $linux_console loglevel=$linux_loglevel $linux_term $linux_addcmdline"}
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tmp_dir=$(mktemp -d)
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user=$(id -un)
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cat << EOF > "$tmp_dir/smbd.conf"
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[global]
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interfaces = 127.0.0.1
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smb ports = 4450
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private dir = $tmp_dir
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bind interfaces only = yes
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pid directory = $tmp_dir
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lock directory = $tmp_dir
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state directory = $tmp_dir
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cache directory = $tmp_dir
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ncalrpc dir = $tmp_dir/ncalrpc
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log file = $tmp_dir/log.smbd
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smb passwd file = $tmp_dir/smbpasswd
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security = user
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map to guest = Bad User
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load printers = no
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printing = bsd
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disable spoolss = yes
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usershare max shares = 0
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server min protocol = NT1
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unix extensions = yes
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server role = standalone server
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public = yes
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writeable = yes
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#admin users = root
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#create mask = 0777
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#directory mask = 0777
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force user = $user
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force group = $user
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[rootfs]
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path = $rootfs
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[skels]
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path = $skels
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EOF
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[ -x "$(command -v "$smbd")" ] || die "samba ('$smbd') not found"
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[ -x "$(command -v "$qemu")" ] || die "qemu ('$qemu') not found"
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mkdir -p "$skels"
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"$smbd" --no-process-group -s "$tmp_dir/smbd.conf" -l "$tmp_dir" >/dev/null 2>/dev/null &
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"$qemu" \
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$qemu_kvm \
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-smp "$qemu_cpus" -m "$qemu_mem" \
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-no-reboot \
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-kernel "$kernel" \
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-append "$linux_cmdline" \
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-gdb tcp::1234 \
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$qemu_display \
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$qemu_addopts
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# This seems to reset to the mode the terminal was prior to launching QEMU
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# Inspired by
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# https://github.com/landley/toybox/blob/990e0e7a40e4509c7987a190febe5d867f412af6/toys/other/reset.c#L26-L28
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# man 4 console_codes, ESC [ ? 7 h
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printf '\e[?7h'
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pkill -F "$tmp_dir/smbd.pid"
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rm -rf "$tmp_dir"

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