dracut: Provide minimalistic initramfs files - no udev, no systemd

Provide simple script to run under busybox, this is all we need in the
VM.
This commit is contained in:
Marek Marczykowski-Górecki 2015-03-21 04:14:01 +01:00
parent c64b94e9d6
commit 15cc3b2d51
10 changed files with 78 additions and 6 deletions

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@ -1,4 +1,3 @@
install:
install -d $(DESTDIR)/usr/lib/dracut/modules.d/90qubes-vm
install module-setup.sh mount_modules.sh qubes_cow_setup.sh \
$(DESTDIR)/usr/lib/dracut/modules.d/90qubes-vm/
$(MAKE) -C simple
$(MAKE) -C full

4
dracut/full/Makefile Normal file
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@ -0,0 +1,4 @@
install:
install -d $(DESTDIR)/usr/lib/dracut/modules.d/90qubes-vm
install module-setup.sh mount_modules.sh qubes_cow_setup.sh \
$(DESTDIR)/usr/lib/dracut/modules.d/90qubes-vm/

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@ -11,3 +11,4 @@ if ! [ -d $NEWROOT/lib/modules/`uname -r` ]; then
mount -n -t ext3 /dev/xvdd $NEWROOT/lib/modules
fi
killall udevd systemd-udevd

4
dracut/simple/Makefile Normal file
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@ -0,0 +1,4 @@
install:
install -d $(DESTDIR)/usr/lib/dracut/modules.d/90qubes-vm-simple
install module-setup.sh init.sh \
$(DESTDIR)/usr/lib/dracut/modules.d/90qubes-vm-simple/

48
dracut/simple/init.sh Normal file
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@ -0,0 +1,48 @@
#!/bin/sh
echo "Qubes initramfs script here:"
mkdir -p /proc /sys /dev
mount -t proc proc /proc
mount -t sysfs sysfs /sys
mount -t devtmpfs devtmpfs /dev
if [ -e /dev/mapper/dmroot ] ; then
die "Qubes: FATAL error: /dev/mapper/dmroot already exists?!"
fi
modprobe xenblk || modprobe xen-blkfront || echo "Qubes: Cannot load Xen Block Frontend..."
echo "Waiting for /dev/xvda* devices..."
while ! [ -e /dev/xvda ]; do sleep 0.1; done
if [ `cat /sys/block/xvda/ro` = 1 ] ; then
echo "Qubes: Doing COW setup for AppVM..."
while ! [ -e /dev/xvdc ]; do sleep 0.1; done
while ! [ -e /dev/xvdc2 ]; do sleep 0.1; done
echo "0 `cat /sys/block/xvda/size` snapshot /dev/xvda /dev/xvdc2 N 16" | \
dmsetup create dmroot || { echo "Qubes: FATAL: cannot create dmroot!"; }
echo Qubes: done.
else
echo "Qubes: Doing R/W setup for TemplateVM..."
echo "0 `cat /sys/block/xvda/size` linear /dev/xvda 0" | \
dmsetup create dmroot || { echo "Qubes: FATAL: cannot create dmroot!"; exit 1; }
echo Qubes: done.
fi
dmsetup mknodes dmroot
mkdir -p /sysroot
mount /dev/mapper/dmroot /sysroot -o ro
if ! [ -d $NEWROOT/lib/modules/`uname -r` ]; then
echo "Waiting for /dev/xvdd device..."
while ! [ -e /dev/xvdd ]; do sleep 0.1; done
mount -n -t ext3 /dev/xvdd $NEWROOT/lib/modules
fi
umount /dev /sys /proc
exec switch_root /sysroot /sbin/init

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@ -0,0 +1,14 @@
#!/bin/bash
check() {
return 255
}
depends() {
echo busybox dm
return 0
}
install() {
inst $moddir/init.sh /init
}

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@ -28,7 +28,7 @@ basedir=/var/lib/qubes/vm-kernels
function recompile_u2mfn() {
kver=$1
u2mfn_ver=`dkms status u2mfn|tail -n 1|cut -f 2 -d ' '|tr -d ':,'`
dkms install u2mfn/$u2mfn_ver -k $kver
dkms install u2mfn/$u2mfn_ver -k $kver --no-initrd
}
function build_modules_img() {
@ -50,8 +50,8 @@ function build_initramfs() {
output_file=$2
/sbin/dracut --nomdadmconf --nolvmconf --force \
--modules "bash dm kernel-modules rootfs-block base fs-lib shutdown" \
--modules "qubes-vm" --conf /dev/null --confdir /var/empty \
--modules "kernel-modules qubes-vm-simple" \
--conf /dev/null --confdir /var/empty \
-d "xenblk xen-blkfront cdrom ext4 jbd2 crc16 dm_snapshot" \
$output_file $kver
}

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@ -34,6 +34,7 @@ URL: http://www.qubes-os.org
Requires: dracut
Requires: dkms
Requires: busybox
%define _builddir %(pwd)
@ -60,6 +61,7 @@ make install-kernel-support DESTDIR=%{buildroot}
%files
/usr/lib/dracut/modules.d/90qubes-vm
/usr/lib/dracut/modules.d/90qubes-vm-simple
/usr/src/u2mfn-%{version}/
/usr/sbin/qubes-prepare-vm-kernel