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## Downloaded packages
### SHA-256
For each uploaded _Debian_ package a [SHA-256](https://en.wikipedia.org/wiki/SHA-2) checksum is computed.
This checksum is used to create a file tree where each package will reside, with following hierarchy.
#### Directory and sub-directories structure
- 1st and 2nd characters of SHA-256 checksum as sub-directory of **rootDir**/pool directory.
- 3rd and 4th characters of SHA-256 checksum as sub-directory of the former
ex:
sha256sum **476e**0cdac6bc757dd2b78bacc1325323b09c45ecb41d4562deec2a1c7c148405 my-package_1.2.3_all.deb
```bash
${rootDir}/pool # rootDir defined in aptly.conf
└── 47
└── 6e
```
#### Filename
The following items are concatenated to form the filename under which package is stored.
- 5th to the 31st characters of SHA-256 checksum
- "\_" (undescore)
- filename of uploaded _Debian_ as defined in [Debian package file names](https://www.debian.org/doc/manuals/debian-reference/ch02.en.html#_debian_package_file_names)
ex:
sha256sum 476e**0cdac6bc757dd2b78bacc13253**23b09c45ecb41d4562deec2a1c7c148405 **my-package_1.2.3_all.deb**
```
0cdac6bc757dd2b78bacc13253_my-package_1.2.3_all.deb
```
### MD5
For each uploaded _Debian_ package a [MD5](https://en.wikipedia.org/wiki/MD5) checksum is computed.
This checksum is used to create a file tree where each package will reside, with following hierarchy
**Note:** [MD5](https://en.wikipedia.org/wiki/MD5) is only legacy layout. Its support is limited to
'read' files from the pool, it never puts files this way for new package files.
#### Directory and sub-directories structure
- 1st and 2nd characters of MD5 checksum as sub-directory name of **rootDir**/pool directory
- 3rd and 4th characters of MD5 chacksum as sub-directory name of the former
ex:
md5sum **feea**3c0c3e823615bf2d417b052a96b4 my-package_1.2.3_all.deb
```bash
${rootDir}/pool # rootDir defined in aptly.conf
└── fe
└── ea
```
#### Filename
Uploaded _Debian_ is stored as-is and not renamed.
### Example
```bash
${rootDir}/pool # rootDir defined in aptly.conf
├── 00
│ ├── 25
│ │ └── yet_another_package-0.6.0_all.deb
│ ├── 60
│ ├── 97
│ │ └── 80ced73165f92fea490f2561a7c4_my-package_0.0.1_all.deb
│ ├── 6e
│ │ └── 0cdac6bc757dd2b78bacc13253_my-package_1.2.3_all.deb # sha256sum 476e0cdac6bc757dd2b78bacc1325323b09c45ecb41d4562deec2a1c7c148405
│ └── db
│ └── yet_another_package-0.5.8_all.deb # md5sum 00db7ada61aa28a6931267f1714cbb15
...
├── 2a
│ ├── 10
│ │ └── yet_another_package-0.5.9_all.deb
│ ├── 64
│ │ └── 80ced73165f92fea490f2561a7c4_my-other-package_2.3.2_amd64.deb
│ ├── 4c
│ ├── 5c
│ │ └── yet_another_package-0.6.1_all.deb
│ ├── 77
│ ├── b5
│ │ └── 4b2eb349236cf5c4af7eca68a43b_my-package_0.2.0_amd64.deb
...
└── ff
├── 4c
├── 5a
│ └── 8868dd8661bbe25c51bdd9b2d25c_my-package_0.2.0_amd64.deb
└── dc
```
|
