Faster (25 GiB test VM: the map goes from 2.5s to 50ms) and fewer moving
parts: the vddk map needs nbdkit, the vddk library and nbdinfo, all
version-coupled, where CBT is a handful of documented calls every backup
product has relied on for years.
Checked on ESXi 8.0.1 that enabling CBT on a disk which already holds data
backfills the tracking file, so the first query reports what was already
written and not only what is written afterwards. Against `nbdinfo --map` the
two maps differ by 960 KiB which reads back as zeros: CBT reports the blocks
that were written where the vddk reports the ones VMFS allocated.
CBT must be enabled before the migration, it cannot usefully be turned on
during the run:
- powered off VM: nothing else to do, the reconfigure writes the tracking
file and the query answers straight away
- running VM: the query needs a snapshot, and tracking only starts at the
next stun (snapshot create/delete, power cycle, vMotion)
This branch is a reliability overhaul of the ESXi/vSphere source side of V2V, plus a scope reduction of the package. The SOAP plumbing is rewritten:
VimClient wraps @vates/node-vsphere-soap in a promise API with one emitter per call (no more cross-talk between concurrent calls, no listener leak) and a pTimeout;
vim25 faults are now parsed (_parseFault.mjs) so callers get a real fault type instead of task execution failed;
the library no longer throws from async callbacks (which killed xo-server) and its beforeExit logout hook is per-client instead of removeAllListeners.
Request specs are built in explicit schema order (soap/specs.mjs) with xsi:type, and property values are normalized (soap/normalize.mjs) so search() and the new #retrieveProperty share one shape.
search() now paginates, cancels the retrieval and destroys the container view.
Datastore HTTP downloads get session-cookie reuse, retry with jittered backoff, a headers-only timeout, and range-honouring validation.
Task waiting polls with backoff and per-operation timeouts (6 h for snapshot consolidation).
nbdkit servers are memoized by a key that includes the export options, the readiness wait races the process death instead of sleeping 2 s
the password file is 0600 and unlinked
the thumbprint is read over TLS in-process instead of two openssl spawns.
The old VHD-over-datastore readers (VhdEsxi*, Datastore*, openDeltaVmdkAsVhd) are deleted, hence the majo, rleaving the vddk/NBD path with a COWD grain-directory parser as data-map fallback.
~1.7k lines of unit tests are added.
