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provider: extract nocloud seed builder and keyedlock from kvm2

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kvm2's NoCloud seed builder moves to internal/provider/nocloud (exported,
with an ErrEmptyName sentinel instead of permanentf) and its keyed locks
to internal/provider/keyedlock, tests moved under their existing names.
kvm2 behaviour is unchanged. proxmox gains the per-name lock and the pure
seed helpers (seedISOName, seedVolID, buildSeed); unlike kvm2 (review
finding S5.1), a seed staging failure there is Transient, not Permanent.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
This commit is contained in:
kacerr
2026-09-23 14:01:27 +00:00
co-authored by Claude Opus 5.5
parent 6e996ae2c7
commit 0a6c8624f3
18 changed files with 504 additions and 185 deletions
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docs/kvm2-provider-spec.md
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@@ -511,7 +511,7 @@ every 15 s) marks the connection dead on failure.
per host, dialled lazily, under a mutex with a per-host dial mutex so
concurrent callers dial once and share the result), the per-`(host, volume)`
download locks, and a lock per instance name. Both lock sets are one instance
each of `keyedLocks`: a one-slot semaphore per key, so a waiter gives up when
each of `keyedlock.Locks` (`internal/provider/keyedlock`): a one-slot semaphore per key, so a waiter gives up when
its ctx ends, reference-counted so an entry is removed from the map once no
caller holds or waits for it and the map does not grow with every name ever
seen, while two waiters on one key always share one semaphore. Create and