aa7f2d8423
The current state made vm images belong to root group, no reason to not change those to the primary group of the user building an image. kpartx -d -s could fail in some circumstances, make a safety cleanup call more verbose.
280 lines
6.8 KiB
Bash
Executable File
280 lines
6.8 KiB
Bash
Executable File
#!/bin/bash -ex
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# usage:
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# tar2fs chroot.tar image.raw [size_in_bytes [fstype]]
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. shell-error
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export LANG=C
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if [ $# -lt 2 ]; then
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fatal "error: tar2fs needs at least two arguments"
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fi
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# this needs env_keep sudo setup to actually work
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if [ -n "$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: $WORKDIR"
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MB=1048576 # a parted's "megabyte" in bytes is *broken*
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SIZE_FACTOR=2 # multiply the sizes found by this value
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BOOT_SIZE_FACTOR=2 # multiply /boot size by this value additionally
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CUR_BOUNDARY=0 # align first partition at 1MB for performance (+1)
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INITRD_MODULES=
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BOOTFSTYPE=
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BOOTPART=
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ARCH="$(arch)" # NB: sudo => no GLOBAL_ will do either; mind qemu-*
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case "$ARCH" in
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*86*)
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# NB: different storage modules might be needed for non-kvm
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INITRD_MODULES="sd_mod ata_piix ahci virtio-scsi virtio-blk"
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BLOCKDEV="/dev/sda" # might be /dev/vda for virtio
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ROOTPART="1"
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;;
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arm*)
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BOOTFSTYPE="ext2" # support expected in every sane target uboot
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BLOCKDEV="/dev/mmcblk0p" # ...hopefully...
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BOOTPART="1"
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ROOTPART="2"
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;;
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e2k)
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BOOTFSTYPE="ext2" # firmware knows it
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BLOCKDEV="/dev/sda" # ...hopefully...
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BOOTPART="1"
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ROOTPART="2"
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;;
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esac
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# figure out the part taken by /boot in the given tarball
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boot_size() {
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if [ -n "$BOOTPART" ]; then
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tar tvf "$1" \
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| awk ' \
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BEGIN { sum=0 }
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/^-.* \.\/boot\// { sum=sum+$3 }
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END { print sum }'
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else
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echo "0"
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fi
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}
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# parted wrapper for convenience
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parting() { parted "$LOOPDEV" --align optimal --script -- "$@"; }
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# unfortunately parted is insane enough to lump alignment controls
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# into unit controls so creating adjacent partitions sized in MiB
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# is not as straightforward as it might be... thus "+1" padding;
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# see also http://www.gnu.org/software/parted/manual/parted.html#unit
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mkpart() {
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# a bit different start/end semantics to handle end of device too
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local start="$(($CUR_BOUNDARY + 1))" # yes, we lose a megabyte
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if [ -n "$1" ]; then
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CUR_BOUNDARY="$(($start + $1))"
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local end="$CUR_BOUNDARY"MiB
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else
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local end="-1s" # last sector of the image
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fi
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parting mkpart primary ext2 "$start"MiB "$end"
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}
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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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# 0 means auto; if a value is specified it holds (no /boot subtracted)
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ROOTSIZE="$3"
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[ -n "$ROOTSIZE" -a "$ROOTSIZE" != 0 ] || unset ROOTSIZE
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# image size in bytes
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TARSIZE="$(stat -Lc %s "$TAR")"
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# /boot size in that tarball
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BOOTSIZE="$(boot_size "$TAR")"
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DEFSIZE="$(($SIZE_FACTOR * ($TARSIZE - $BOOTSIZE)))" # (exact sizes)
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ROOTSIZE="$((${ROOTSIZE:-$DEFSIZE} + $MB - 1))" # for ceil rounding to MB
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# image and /boot sizes in megabytes
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ROOTSIZEM="$(($ROOTSIZE / $MB))"
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BOOTSIZEM="$((($SIZE_FACTOR * $BOOT_SIZE_FACTOR * $BOOTSIZE + $MB - 1) / $MB))"
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# tested to work: ext[234], jfs
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# NB: xfs doesn't have a spare sector for the bootloader
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ROOTFSTYPE="${4:-ext4}"
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# single root partition hardwired so far,
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# add another image for home/data/swap if needed
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ROOTDEV="$BLOCKDEV$ROOTPART"
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# last preparations...
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MKFS="mkfs.$ROOTFSTYPE ${BOOTFSTYPE:+mkfs.$BOOTFSTYPE}"
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for i in losetup sfdisk parted kpartx $MKFS; do
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if ! type -t "$i" >&/dev/null; then
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fatal "$i required but not found in host system"
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fi
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done
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LOOPDEV="$(losetup --find)" # would be sad about non-binary megabytes too
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ROOTFS="$WORKDIR/chroot"
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BOOTFS=
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if [ -n "$BOOTPART" ]; then
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BOOTFS="$ROOTFS/boot"
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fi
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exit_handler() {
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rc=$?
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if [ -n "$ROOTFS" ]; then
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umount ${BOOTFS:+"$BOOTFS"} "$ROOTFS"{/dev,/proc,/sys,}
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if [ -n "$LOOPDEV" ]; then
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kpartx -d -s "$LOOPDEV" || {
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sleep 10
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kpartx -d -s -v "$LOOPDEV"
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}
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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 $rc
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}
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# handle -e in shebang as well
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trap exit_handler EXIT ERR
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# prepare disk image and a filesystem inside it
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rm -f -- "$IMG"
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OFFSET="$(($CUR_BOUNDARY + $BOOTSIZEM + $ROOTSIZEM - 1))"
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dd if=/dev/zero of="$IMG" conv=notrunc bs=$MB count=1 seek="$OFFSET"
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losetup "$LOOPDEV" "$IMG"
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parting mklabel msdos
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if [ -n "$BOOTPART" ]; then
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BOOTDEV="$BLOCKDEV$BOOTPART"
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mkpart "$BOOTSIZEM"
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fi
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# not ROOTSIZEM but "the rest"; somewhat non-trivial arithmetics lurk in parted
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mkpart
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kpartx -a -s "$LOOPDEV"
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LOOPROOT="/dev/mapper/$(basename "$LOOPDEV")p$ROOTPART"
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mkfs."$ROOTFSTYPE" "$LOOPROOT"
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if [ -n "$BOOTPART" ]; then
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LOOPBOOT="/dev/mapper/$(basename "$LOOPDEV")p$BOOTPART"
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mkfs."$BOOTFSTYPE" "$LOOPBOOT"
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fi
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ROOTUUID="$(blkid -s UUID -o value -c /dev/null "$LOOPROOT")"
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if [ -n "$ROOTUUID" ]; then
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ROOTDEV="UUID=$ROOTUUID"
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else
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ROOTDEV="$LOOPROOT"
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fi
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if [ -n "$BOOTPART" ]; then
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BOOTUUID="$(blkid -s UUID -o value -c /dev/null "$LOOPBOOT")"
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if [ -n "$ROOTUUID" ]; then
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BOOTDEV="UUID=$BOOTUUID"
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fi
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fi
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# mount and populate it
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mkdir -pm755 "$ROOTFS"
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mount "$LOOPROOT" "$ROOTFS"
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if [ -n "$BOOTPART" ]; then
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mkdir -pm700 "$BOOTFS"
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mount "$LOOPBOOT" "$BOOTFS"
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fi
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tar -C "$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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# loop device so lilo could work...
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echo "$ROOTDEV / $ROOTFSTYPE relatime 1 1" >> "$ROOTFS/etc/fstab"
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# target device at once
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if [ -n "$BOOTPART" ]; then
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echo "$BOOTDEV /boot $BOOTFSTYPE defaults 1 2" >> "$ROOTFS/etc/fstab"
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fi
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echo "MODULES_PRELOAD += $INITRD_MODULES $ROOTFSTYPE" >> "$ROOTFS/etc/initrd.mk"
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case "$ARCH" in
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*86*)
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echo "FEATURES += qemu" >> "$ROOTFS/etc/initrd.mk"
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;;
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e2k)
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echo "FEATURES += usb" >> "$ROOTFS/etc/initrd.mk"
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;;
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esac
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# NB: don't stick BOOTFS here, it has slightly different semantics
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pushd $ROOTFS/boot
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if [ -s .origver ]; then
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read KVER < .origver
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fi
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[ -n "$KVER" ] || fatal "unable to deduce kernel version"
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chroot "$ROOTFS" make-initrd -k "$KVER"
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rm -f .origver
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# ...target device too
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sed -i "s,$LOOPROOT,$ROOTDEV," "$ROOTFS/etc/fstab"
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if [ -f boot.conf ]; then
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sed -i -e "s,@ROOTUUID@,$ROOTUUID,g" -e "s,@KVER@,$KVER,g" boot.conf
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fi
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popd
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if [ -x "$ROOTFS"/sbin/lilo ]; then
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# configure and install bootloader
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REGEXP='^.*: ([0-9]+) cylinders, ([0-9]+) heads, ([0-9]+) sectors/track*$'
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set -- $(sfdisk -g "$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=$ROOTDEV rootdelay=3 console=tty1 console=ttyS0,115200n8\"
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label=linux"
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cat > "$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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cylinders=$1
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heads=$2
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sectors=$3
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partition=$LOOPROOT
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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 > "$ROOTFS"/etc/lilo.conf <<-EOF
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boot=$BLOCKDEV
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$LILO_COMMON
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EOF
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fi
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if [ -n "$SUDO_USER" ]; then
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chown "$SUDO_USER:$(id -g "$SUDO_USER")" "$IMG" "$ROOTFS" "$WORKDIR" ||:
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fi
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