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repository: restrict SaveUnpacked and RemoveUnpacked

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Those methods now only allow modifying snapshots. Internal data types
used by the repository are now read-only. The repository-internal code
can bypass the restrictions by wrapping the repository in an
`internalRepository` type.

The restriction itself is implemented by using a new datatype
WriteableFileType in the SaveUnpacked and RemoveUnpacked methods. This
statically ensures that code cannot bypass the access restrictions.

The test changes are somewhat noisy as some of them modify repository
internals and therefore require some way to bypass the access
restrictions. This works by capturing an `internalRepository` or
`Backend` when creating the Repository using a test helper function.
This commit is contained in:
Michael Eischer
2024-12-01 12:19:16 +01:00
parent 5bf0204caf
commit 99e105eeb6
37 changed files with 353 additions and 294 deletions
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2
internal/repository/repair_pack.go
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@@ -65,7 +65,7 @@ func RepairPacks(ctx context.Context, repo *Repository, ids restic.IDSet, printe
printer.P("removing salvaged pack files")
// if we fail to delete the damaged pack files, then prune will remove them later on
bar = printer.NewCounter("files deleted")
_ = restic.ParallelRemove(ctx, repo, ids, restic.PackFile, nil, bar)
_ = restic.ParallelRemove(ctx, &internalRepository{repo}, ids, restic.PackFile, nil, bar)
bar.Done()
return nil