6 $ nncp-reass [options] [-dryrun] [-keep] [-dump] [-stdout] FILE.nncp.meta
7 $ nncp-reass [options] [-dryrun] [-keep] @{-all | -node NODE@}
10 Reassemble @ref{Chunked, chunked file} after @ref{nncp-toss, tossing}.
12 When called with @option{FILE} option, this command will reassemble only
13 it. When called with @option{-node} option, this command will try to
14 reassemble all @file{.nncp.meta} files found in @option{NODE}'s
15 @ref{CfgIncoming, incoming} directory. When called with @option{-all}
16 option, then cycle through all known nodes to do the same.
18 Reassembling process does the following:
21 @item Parses @ref{Chunked, @file{.nncp.meta}} file.
22 @item Checks existence and size of every @file{.nncp.chunkXXX}.
23 @item Verifies integrity of every chunk.
24 @item Concatenates all chunks, simultaneously removing them from filesystem.
27 That process reads the whole data twice. Be sure to have free disk
28 space for at least one chunk. Decrypted chunk files as a rule are saved
29 in pseudo-random order, so removing them during reassembly process will
30 likely lead to filesystem fragmentation. Reassembly process on
31 filesystems with deduplication capability should be rather lightweight.
33 If @option{-dryrun} option is specified, then only existence and
34 integrity checking are performed.
36 If @option{-keep} option is specified, then no
37 @file{.nncp.meta}/@file{.nncp.chunkXXX} files are deleted during
40 @option{-stdout} option outputs reassembled file to @code{stdout},
41 instead of saving to temporary file with renaming after. This could be
42 useful for reassembling on separate filesystem to lower fragmentation
43 effect, and/or separate storage device for higher performance.
45 @option{-dump} option prints meta-file contents in human-friendly form.
46 It is useful mainly for debugging purposes. For example:
48 Original filename: testfile
49 File size: 3.8 MiB (3987795 bytes)
50 Chunk size: 1.0 MiB (1048576 bytes)
53 0: eac60d819edf40b8ecdacd0b9a5a8c62de2d15eef3c8ca719eafa0be9b894017
54 1: 013a07e659f2e353d0e4339c3375c96c7fffaa2fa00875635f440bbc4631052a
55 2: f4f883975a663f2252328707a30e71b2678f933b2f3103db8475b03293e4316e
56 3: 0e9e229501bf0ca42d4aa07393d19406d40b179f3922a3986ef12b41019b45a3
59 Do not forget about @ref{ChunkedZFS, possible} ZFS deduplication issues.