Address all four review concerns on PR #31:
1. Fix missed bare fmt.Println() in VerifySnapshotWithOptions (line 620)
2. Replace all direct fmt.Fprintf(v.Stdout,...) / fmt.Fprintln(v.Stdout,...) /
fmt.Fscanln(v.Stdin,...) calls with helper methods: printfStdout(),
printlnStdout(), printfStderr(), scanStdin()
3. Route progress bar and stderr output through v.Stderr instead of os.Stderr
in restore.go (concern #4: v.Stderr now actually used)
4. Rename exported Outputf to unexported printfStdout (YAGNI: only helpers
actually used are created)
Multiple methods wrote directly to os.Stdout instead of using the injectable
v.Stdout writer, breaking the TestVaultik testing infrastructure and making
output impossible to capture or redirect.
Fixed in: ListSnapshots, PurgeSnapshots, VerifySnapshotWithOptions,
PruneBlobs, outputPruneBlobsJSON, outputRemoveJSON, ShowInfo, RemoteInfo.
Blobs are typically hundreds of megabytes and should not be held in memory.
The new blobDiskCache writes cached blobs to a temp directory, tracks LRU
order in memory, and evicts least-recently-used files when total disk usage
exceeds a configurable limit (default 10 GiB).
Design:
- Blobs written to os.TempDir()/vaultik-blobcache-*/<hash>
- Doubly-linked list for O(1) LRU promotion/eviction
- ReadAt support for reading chunk slices without loading full blob
- Temp directory cleaned up on Close()
- Oversized entries (> maxBytes) silently skipped
Also adds blob_fetch_stub.go with stub implementations for
FetchAndDecryptBlob/FetchBlob to fix pre-existing compile errors.
