6501b26a36
overlayfs refuse to use R/O upperdir. Since dmroot is properly set
already, it's ok to mount it R/W.
But remount it later R/O, to not confuse startup scripts.
Fixes QubesOS/qubes-issues#5087
(cherry picked from commit 84188910cf)
121 lines
3.7 KiB
Bash
121 lines
3.7 KiB
Bash
#!/bin/sh
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echo "Qubes initramfs script here:"
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mkdir -p /proc /sys /dev
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mount -t proc proc /proc
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mount -t sysfs sysfs /sys
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mount -t devtmpfs devtmpfs /dev
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if [ -w /sys/devices/system/xen_memory/xen_memory0/scrub_pages ]; then
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# re-enable xen-balloon pages scrubbing, after initial balloon down
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echo 1 > /sys/devices/system/xen_memory/xen_memory0/scrub_pages
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fi
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if [ -e /dev/mapper/dmroot ] ; then
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echo "Qubes: FATAL error: /dev/mapper/dmroot already exists?!"
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fi
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/sbin/modprobe xenblk || /sbin/modprobe xen-blkfront || echo "Qubes: Cannot load Xen Block Frontend..."
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die() {
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echo "$@" >&2
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exit 1
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}
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echo "Waiting for /dev/xvda* devices..."
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while ! [ -e /dev/xvda ]; do sleep 0.1; done
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# prefer partition if exists
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if [ -b /dev/xvda1 ]; then
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if [ -d /dev/disk/by-partlabel ]; then
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ROOT_DEV=$(basename $(readlink "/dev/disk/by-partlabel/Root\\x20filesystem"))
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else
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ROOT_DEV=$(grep -l "PARTNAME=Root filesystem" /sys/block/xvda/xvda*/uevent |\
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grep -o "xvda[0-9]")
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fi
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if [ -z "$ROOT_DEV" ]; then
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# fallback to third partition
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ROOT_DEV=xvda3
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fi
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else
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ROOT_DEV=xvda
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fi
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SWAP_SIZE=$(( 1024 * 1024 * 2 )) # sectors, 1GB
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if [ `cat /sys/class/block/$ROOT_DEV/ro` = 1 ] ; then
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echo "Qubes: Doing COW setup for AppVM..."
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while ! [ -e /dev/xvdc ]; do sleep 0.1; done
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VOLATILE_SIZE=$(cat /sys/class/block/xvdc/size) # sectors
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ROOT_SIZE=$(cat /sys/class/block/$ROOT_DEV/size) # sectors
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if [ $VOLATILE_SIZE -lt $SWAP_SIZE ]; then
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die "volatile.img smaller than 1GB, cannot continue"
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fi
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/sbin/sfdisk -q --unit S /dev/xvdc >/dev/null <<EOF
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1,$SWAP_SIZE,S
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,,L
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EOF
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if [ $? -ne 0 ]; then
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echo "Qubes: failed to setup partitions on volatile device"
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exit 1
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fi
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while ! [ -e /dev/xvdc1 ]; do sleep 0.1; done
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/sbin/mkswap /dev/xvdc1
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while ! [ -e /dev/xvdc2 ]; do sleep 0.1; done
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echo "0 `cat /sys/class/block/$ROOT_DEV/size` snapshot /dev/$ROOT_DEV /dev/xvdc2 N 16" | \
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/sbin/dmsetup create dmroot || { echo "Qubes: FATAL: cannot create dmroot!"; exit 1; }
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/sbin/dmsetup mknodes dmroot
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echo Qubes: done.
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else
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echo "Qubes: Doing R/W setup for TemplateVM..."
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while ! [ -e /dev/xvdc ]; do sleep 0.1; done
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/sbin/sfdisk -q --unit S /dev/xvdc >/dev/null <<EOF
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1,$SWAP_SIZE,S
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EOF
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if [ $? -ne 0 ]; then
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die "Qubes: failed to setup partitions on volatile device"
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fi
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while ! [ -e /dev/xvdc1 ]; do sleep 0.1; done
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/sbin/mkswap /dev/xvdc1
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ln -s ../$ROOT_DEV /dev/mapper/dmroot
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echo Qubes: done.
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fi
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/sbin/modprobe ext4
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mkdir -p /sysroot
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mount /dev/mapper/dmroot /sysroot -o rw
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NEWROOT=/sysroot
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kver="`uname -r`"
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if ! [ -d "$NEWROOT/lib/modules/$kver/kernel" ]; then
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echo "Waiting for /dev/xvdd device..."
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while ! [ -e /dev/xvdd ]; do sleep 0.1; done
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mkdir -p /tmp/modules
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mount -n -t ext3 /dev/xvdd /tmp/modules
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if /sbin/modprobe overlay; then
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# if overlayfs is supported, use that to provide fully writable /lib/modules
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if ! [ -d "$NEWROOT/lib/.modules_work" ]; then
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mkdir -p "$NEWROOT/lib/.modules_work"
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fi
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mount -t overlay none $NEWROOT/lib/modules -o lowerdir=/tmp/modules,upperdir=$NEWROOT/lib/modules,workdir=$NEWROOT/lib/.modules_work
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else
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# otherwise mount only `uname -r` subdirectory, to leave the rest of
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# /lib/modules writable
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if ! [ -d "$NEWROOT/lib/modules/$kver" ]; then
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mkdir -p "$NEWROOT/lib/modules/$kver"
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fi
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mount --bind "/tmp/modules/$kver" "$NEWROOT/lib/modules/$kver"
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fi
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umount /tmp/modules
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rmdir /tmp/modules
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fi
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umount /dev /sys /proc
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mount "$NEWROOT" -o remount,ro
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exec /sbin/switch_root $NEWROOT /sbin/init
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