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DejaVu is the component of data snapshot and sync for SiYuan.

• Git-like version control
• File deduplication in chunks
• Data compression
• AES Encrypted
• Cloud sync and backup
• Load assets on demand

⚠️ Attention

• Folders are not supported
• Permission attributes are not supported
• Symbolic links are not supported

Design reference from ArtiVC.

• ID Each entity is identified by SHA-1
• Index file list, each index operation generates a new index
  • parent points to the previous index
  • memo index memo
  • created index time
  • files file list
  • count count of total files
  • size size of total files
• File file, a new file is generated when the actual data file path or content changes
  • path file path
  • size file size
  • updated last update time
  • chunks file chunk list
• Chunk file chunk
  • data actual data
• Ref refers to the index
  • latest built-in reference, automatically points to the latest index
  • tag tag reference, manually point to the specified index
• Repo repository

• DataPath data folder path, the folder where the actual data file is located
• Path repo folder path, the repo is not stored in the data folder, we need to specify the repo folder path separately

The repo folder layout is as follows:

├─indexes
│      0531732dca85404e716abd6bb896319a41fa372b
│      19fc2c2e5317b86f9e048f8d8da2e4ed8300d8af
│      5f32d78d69e314beee36ad7de302b984da47ddd2
│      cbd254ca246498978d4f47e535bac87ad7640fe6
│
├─objects
│  ├─1e
│  │      0ac5f319f5f24b3fe5bf63639e8dbc31a52e3b
│  │
│  ├─56
│  │      322ccdb61feab7f2f76f5eb82006bd51da7348
│  │
│  ├─7e
│  │      dccca8340ebe149b10660a079f34a20f35c4d4
│  │
│  ├─83
│  │      a7d72fe9a071b696fc81a3dc041cf36cbde802
│  │
│  ├─85
│  │      26b9a7efde615b67b4666ae509f9fbc91d370b
│  │
│  ├─87
│  │      1355acd062116d1713e8f7f55969dbb507a040
│  │
│  ├─96
│  │      46ba13a4e8eabeca4f5259bfd7da41d368a1a6
│  │
│  ├─a5
│  │      5b8e6b9ccad3fc9b792d3d453a0793f8635b9f
│  │      b28787922f4e2a477b4f027e132aa7e35253d4
│  │
│  ├─be
│  │      c7a729d1b5f021f8eca0dd8b6ef689ad753567
│  │
│  ├─d1
│  │      324c714bde18442b5629a84a361b5e7528b14a
│  │
│  ├─f1
│  │      d7229171f4fa1c5eacb411995b16938a04f7f6
│  │
│  └─f7
│          ff9e8b7bb2e09b70935a5d785e0cc5d9d0abf0
│
└─refs
    │  latest
    │
    └─tags
            v1.0.0
            v1.0.1

DejaVu uses the GNU AFFERO GENERAL PUBLIC LICENSE, Version 3 open source license.

• https://github.com/dustin/go-humanize MIT license
• https://github.com/klauspost/compress BSD-3-Clause license
• https://github.com/panjf2000/ants MIT license
• https://github.com/InfuseAI/ArtiVC Apache-2.0 license
• https://github.com/restic/restic BSD-2-Clause license
• https://github.com/sabhiram/go-gitignore MIT license