131 lines
3.0 KiB
Plaintext
131 lines
3.0 KiB
Plaintext
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#!/bin/sh -e
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. shell-error
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if [ $# -lt 2 ]; then
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fatal "error: tar2vm needs at least two arguments"
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fi
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# this needs env_keep sudo setup to actually work
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if [ -n "$GLOBAL_BUILDDIR" ]; then
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WORKDIR="$GLOBAL_BUILDDIR/vmroot"
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else
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WORKDIR="$(mktemp --tmpdir -d vmroot-XXXXX)"
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fi
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[ -n "$WORKDIR" ] || fatal "couldn't come up with suitable WORKDIR"
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[ -n "$GLOBAL_DEBUG" ] || message "WORKDIR: $WORKDIR"
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# a tarball containing chroot with a kernel
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TAR="$1"
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[ -s "$TAR" ] || fatal "source tarball doesn't really exist"
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# a path to the image to be generated
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IMG="$2"
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[ -d "$(dirname "$IMG")" ] || fatal "target directory doesn't exist"
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# image size in bytes (256M is a fallback)
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TARSIZE="$(stat -Lc %s "$TAR")"
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DEFSIZE="$(expr 3 '*' "$TARSIZE" '/' 2)"
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DISKSIZE="${3:-${DEFSIZE:-268435456}}"
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# ...and in megabytes
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DISKSIZEM="$(expr "$DISKSIZE" / 1048576)"
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# tested to work: ext[234], jfs
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ROOTFSTYPE="${4:-ext4}"
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# single root partition hardwired so far,
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# add another image for swap if needed
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ROOTDEV="/dev/sda1"
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# last preparations...
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for i in losetup parted kpartx mkfs."$ROOTFSTYPE"; do
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if ! type -t "$i" >&/dev/null; then
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fatal "$i required but not found"
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fi
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done
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LOOPDEV="$(losetup --find)"
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ROOTFS="$WORKDIR/chroot"
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exit_handler()
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{
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rc=$?
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if [ -n "$ROOTFS" ]; then
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umount "$ROOTFS"{/dev,/proc,/sys,}
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if [ -n "$LOOPDEV" ]; then
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kpartx -d "$LOOPDEV"
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losetup --detach "$LOOPDEV"
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fi
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rm -r -- "$ROOTFS"
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rmdir -- "$WORKDIR"
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fi
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exit $rc
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}
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trap exit_handler EXIT
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# prepare disk image and a filesystem inside it
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rm -f -- "$IMG"
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dd if=/dev/zero of="$IMG" bs=1 count=1 seek="$DISKSIZE" conv=notrunc
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losetup "$LOOPDEV" "$IMG"
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parted --script "$LOOPDEV" mklabel msdos
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parted --script "$LOOPDEV" mkpart primary ext2 1 "$DISKSIZEM"
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kpartx -a "$LOOPDEV"
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LOOPDEV1="/dev/mapper/$(basename "$LOOPDEV")p1"
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mkfs."$ROOTFSTYPE" "$LOOPDEV1"
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# mount and populate it
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mkdir -pm755 "$ROOTFS"
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mount "$LOOPDEV1" "$ROOTFS"
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tar -C "$ROOTFS" --numeric-owner -xf "$TAR"
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for i in /dev /proc /sys; do mount --bind "$i" "$ROOTFS$i"; done
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# NB: different storage modules might be needed for non-kvm
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echo "$LOOPDEV1 / $ROOTFSTYPE defaults 1 1" >> "$ROOTFS/etc/fstab"
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echo "MODULES_PRELOAD=sd_mod ata_piix $ROOTFSTYPE" >> "$ROOTFS/etc/initrd.mk"
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KERNEL="$(readlink $ROOTFS/boot/vmlinuz | sed 's,vmlinuz-,,')"
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chroot "$ROOTFS" make-initrd -k "$KERNEL"
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sed -i "s,$LOOPDEV1,$ROOTDEV," "$ROOTFS/etc/fstab"
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# configure and install bootloader
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REGEXP='^([0-9]+) heads, ([0-9]+) sectors/track, ([0-9]+) cylinders.*$'
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set -- $(fdisk -l "$LOOPDEV" | grep -E "$REGEXP" | sed -r "s@$REGEXP@\1 \2 \3@")
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LILO_COMMON="lba32
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delay=1
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vga=0
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image=/boot/vmlinuz
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initrd=/boot/initrd.img
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append=\"root=$ROOTDEV rootdelay=3\"
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label=linux"
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cat > "$ROOTFS"/etc/lilo-loop.conf << EOF
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boot=$LOOPDEV
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disk=$LOOPDEV
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bios=0x80
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heads=$1
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sectors=$2
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cylinders=$3
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partition=$LOOPDEV1
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start=63
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$LILO_COMMON
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EOF
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chroot "$ROOTFS" lilo -C /etc/lilo-loop.conf
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cat > "$ROOTFS"/etc/lilo.conf << EOF
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boot=${ROOTDEV%[0-9]*}
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$LILO_COMMON
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EOF
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if [ -n "$SUDO_USER" ]; then
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chown "$SUDO_USER" "$IMG" "$ROOTFS" "$WORKDIR"
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fi
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