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prepare_snapshot() {
SNAPSHOT_UUID="34f617be-192a-46b3-a8ae-bce1029e093f" # snapshot UUID is static
# get UUID of VBox image
HDD_UUID=$(${VBOX_BASE_DIR}/VBoxManage -q showvdiinfo ${VBOX_HDD_LINK} \
| grep UUID | grep -v "Parent UUID" | awk '{print $2}' \
| grep -v use ) # nec. for VBox >= 4
# TODO support vmdk disks?
VBOX_HDD_FORMAT="VDI"
if isset VM_DISKFILE_RO; then
# use temp disk as snapshot to get CoW
VBOX_HDD_TYPE="Immutable" # make disk immutable
VBOX_HDD_UUID=${SNAPSHOT_UUID}
< "${VBOX_PLUGIN_DIR}/empty-diff.vdi.gz" gunzip > "${VBOX_SNAPSHOT_DIR}/{${SNAPSHOT_UUID}}.vdi"
# patch the disk file uuid into the snapshot vdi file:
# We read from offset 424 in the source HDD and write the 16 bytes long UUID
# starting at offset 392 in the snapshot.
# TODO: This requires the image to be a vdi/vdh; Afaik, vbox supports vmdk,
# so this code would break in that case. Can we use the diskuuid we got via
# VBoxManage, convert to binary, and patch it
dd if=${VBOX_HDD_LINK} of="${VBOX_SNAPSHOT_DIR}/{${SNAPSHOT_UUID}}.vdi" seek=424 \
skip=392 bs=1 count=16 conv=notrunc || \
writelog "Could not patch snapshot file"
elif isset VM_DISKFILE_RW; then
# Image is already RW - easy
VBOX_HDD_TYPE="Normal"
VBOX_HDD_UUID=${HDD_UUID}
else
writelog "Neither VM_DISKFILE_RO nor VM_DISKFILE_RW defined!"
cleanexit 1
fi
}
call_post_source prepare_snapshot
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