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* The -smb flag in QEMU/KVM is unreliable: it doesn't work without the
-no-kvm-irqchip flag, and on the Hydra machines only works on the rather old KVM 76. So as a workaround, don't use -smb, but use QEMU's "guestfwd" feature to forward 10.0.2.4:139 in the guest to a Unix domain socket on the host connected to Samba. * Use "cache=writeback" to improve performance a lot. * Use "werror=report" to make QEMU crash instead of hang if the host filesystem is full. svn path=/nixpkgs/trunk/; revision=22249
This commit is contained in:
Eelco Dolstra
parent
9bf1c85983
commit
1f8e6d4814
@ -1,4 +1,4 @@
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{pkgs}:
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{ pkgs }:
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with pkgs;
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@ -7,15 +7,18 @@ rec {
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inherit (linuxPackages_2_6_32) kernel;
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kvm = pkgs.kvm76;
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kvm = pkgs.qemu_kvm;
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modulesClosure = makeModulesClosure {
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inherit kernel;
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rootModules = ["cifs" "virtio_net" "virtio_pci" "virtio_blk" "virtio_balloon" "nls_utf8" "ext2" "ext3" "unix"];
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rootModules = [ "cifs" "virtio_net" "virtio_pci" "virtio_blk" "virtio_balloon" "nls_utf8" "ext2" "ext3" "unix" "sd_mod" "ata_piix" ];
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};
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hd = "vda"; # either "sda" or "vda"
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initrdUtils = runCommand "initrd-utils"
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{ buildInputs = [ nukeReferences ];
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allowedReferences = [ "out" modulesClosure ]; # prevent accidents like glibc being included in the initrd
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@ -47,8 +50,8 @@ rec {
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# Copy some other tools.
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cp ${bash}/bin/bash $out/bin
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cp ${module_init_tools}/sbin/insmod $out/bin/insmod
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cp ${pkgs.nettools}/sbin/ifconfig $out/bin
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cp ${pkgs.sysvinit}/sbin/halt $out/bin
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cp ${nettools}/sbin/ifconfig $out/bin
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cp ${sysvinit}/sbin/halt $out/bin
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# Run patchelf to make the programs refer to the copied libraries.
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for i in $out/bin/* $out/lib/*; do if ! test -L $i; then nuke-refs $i; fi; done
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@ -65,8 +68,8 @@ rec {
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mknod ${dev}/null c 1 3
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mknod ${dev}/zero c 1 5
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mknod ${dev}/tty c 5 0
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. /sys/class/block/vda/uevent
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mknod ${dev}/vda b $MAJOR $MINOR
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. /sys/class/block/${hd}/uevent
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mknod ${dev}/${hd} b $MAJOR $MINOR
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'';
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@ -123,25 +126,17 @@ rec {
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if test -z "$mountDisk"; then
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mount -t tmpfs none /fs
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else
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mount -t ext2 /dev/vda /fs
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mount -t ext2 /dev/${hd} /fs
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fi
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mkdir -p /fs/hostfs
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mkdir -p /fs/dev
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mount -o bind /dev /fs/dev
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n=.
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echo "mounting host filesystem..."
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while true; do
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if mount -t cifs //10.0.2.4/qemu /fs/hostfs -o guest,username=nobody; then
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break
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else
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n=".$n"
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test ''${#n} -le 10 || exit 1
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sleep 1
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echo "retrying..."
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fi
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for ((n = 0; n < 10; n++)); do
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echo "mounting host filesystem, attempt $n..."
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mount -t cifs //10.0.2.4/qemu /fs/hostfs -o guest,username=nobody && break
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done
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mkdir -p /fs/nix/store
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@ -215,10 +210,10 @@ rec {
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qemuCommandLinux = ''
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qemu-system-x86_64 -no-kvm-irqchip \
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qemu-system-x86_64 \
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-nographic -no-reboot \
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-net nic,model=virtio -net user -smb / \
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-drive file=$diskImage,if=virtio,boot=on \
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-net nic,model=virtio -chardev socket,id=samba,path=$TMPDIR/samba -net user,guestfwd=tcp:10.0.2.4:139-chardev:samba \
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-drive file=$diskImage,if=virtio,boot=on,cache=writeback,werror=report \
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-kernel ${kernel}/bzImage \
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-initrd ${initrd}/initrd \
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-append "console=ttyS0 panic=1 command=${stage2Init} tmpDir=$TMPDIR out=$out mountDisk=$mountDisk" \
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@ -229,12 +224,28 @@ rec {
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vmRunCommand = qemuCommand: writeText "vm-run" ''
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export > saved-env
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PATH=${coreutils}/bin:${kvm}/bin:${samba}/sbin
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PATH=${coreutils}/bin:${kvm}/bin
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diskImage=''${diskImage:-/dev/null}
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eval "$preVM"
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cat > smb.conf <<EOF
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[global]
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private dir=$TMPDIR
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smb ports=0
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socket address=127.0.0.1
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pid directory=$TMPDIR
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lock directory=$TMPDIR
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log file=$TMPDIR/log.smbd
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smb passwd file=$TMPDIR/smbpasswd
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security = share
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[qemu]
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path=/
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read only=no
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guest ok=yes
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EOF
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# Write the command to start the VM to a file so that the user can
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# debug inside the VM if the build fails (when Nix is called with
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# the -K option to preserve the temporary build directory).
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@ -242,6 +253,8 @@ rec {
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#! ${bash}/bin/sh
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diskImage=$diskImage
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TMPDIR=$TMPDIR
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${socat}/bin/socat unix-listen:$TMPDIR/samba exec:'${samba}/sbin/smbd -s $TMPDIR/smb.conf' &
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while [ ! -e $TMPDIR/samba ]; do sleep 0.1; done # ugly
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${qemuCommand}
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EOF
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@ -271,8 +284,8 @@ rec {
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createRootFS = ''
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mkdir /mnt
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${e2fsprogs}/sbin/mke2fs -F /dev/vda
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${utillinux}/bin/mount -t ext2 /dev/vda /mnt
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${e2fsprogs}/sbin/mke2fs -F /dev/${hd}
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${utillinux}/bin/mount -t ext2 /dev/${hd} /mnt
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if test -e /mnt/.debug; then
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exec ${bash}/bin/sh
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@ -429,6 +442,7 @@ rec {
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# Make the Nix store available in /mnt, because that's where the RPMs live.
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mkdir -p /mnt/nix/store
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${utillinux}/bin/mount -o bind /nix/store /mnt/nix/store
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${utillinux}/bin/mount -o bind /tmp /mnt/tmp
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echo "installing RPMs..."
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PATH=/usr/bin:/bin:/usr/sbin:/sbin $chroot /mnt \
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@ -440,6 +454,7 @@ rec {
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rm /mnt/.debug
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${utillinux}/bin/umount /mnt/nix/store
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${utillinux}/bin/umount /mnt/tmp
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${utillinux}/bin/umount /mnt
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'';
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