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doc: Add obsolete Index files

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Alexander Neumann 2015-05-03 15:00:32 +02:00
parent 281eea9c05
commit e3ffe33216
1 changed files with 35 additions and 23 deletions
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doc/Design.md
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@ -162,32 +162,44 @@ used to reconstruct the index. The files are encrypted and authenticated like
Data and Tree Blobs, so the outer structure is `IV || Ciphertext || MAC` again. Data and Tree Blobs, so the outer structure is `IV || Ciphertext || MAC` again.
The plaintext consists of a JSON document like the following: The plaintext consists of a JSON document like the following:
[ { {
"id": "73d04e6125cf3c28a299cc2f3cca3b78ceac396e4fcf9575e34536b26782413c", "obsolete": [
"blobs": [ "ed54ae36197f4745ebc4b54d10e0f623eaaaedd03013eb7ae90df881b7781452"
],
"packs": [
{ {
"id": "3ec79977ef0cf5de7b08cd12b874cd0f62bbaf7f07f3497a5b1bbcc8cb39b1ce", "id": "73d04e6125cf3c28a299cc2f3cca3b78ceac396e4fcf9575e34536b26782413c",
"type": "data", "blobs": [
"offset": 0, {
"length": 25 "id": "3ec79977ef0cf5de7b08cd12b874cd0f62bbaf7f07f3497a5b1bbcc8cb39b1ce",
},{ "type": "data",
"id": "9ccb846e60d90d4eb915848add7aa7ea1e4bbabfc60e573db9f7bfb2789afbae", "offset": 0,
"type": "tree", "length": 25
"offset": 38, },{
"length": 100 "id": "9ccb846e60d90d4eb915848add7aa7ea1e4bbabfc60e573db9f7bfb2789afbae",
}, "type": "tree",
{ "offset": 38,
"id": "d3dc577b4ffd38cc4b32122cabf8655a0223ed22edfd93b353dc0c3f2b0fdf66", "length": 100
"type": "data", },
"offset": 150, {
"length": 123 "id": "d3dc577b4ffd38cc4b32122cabf8655a0223ed22edfd93b353dc0c3f2b0fdf66",
} "type": "data",
"offset": 150,
"length": 123
}
]
}, [...]
] ]
} ] }
This JSON document lists Blobs with contents. In this example, the Pack This JSON document lists Packs and the blobs contained therein. In this
`73d04e61` contains two data Blobs and one Tree blob, the plaintext hashes are example, the Pack `73d04e61` contains two data Blobs and one Tree blob, the
listed afterwards. plaintext hashes are listed afterwards.
The field `obsolete` lists the storage IDs of index files that have been
replaced with the current index file. This happens when index files are
repacked, this happens for example when old snapshots are removed and Packs are
recombined.
There may be an arbitrary number of index files, containing information on There may be an arbitrary number of index files, containing information on
non-disjoint sets of Packs. The number of packs described in a single file is non-disjoint sets of Packs. The number of packs described in a single file is