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# File System Object
The Nix store uses a simple file system model for the data it holds in [store objects](store.md#store-object).
Every file system object is one of the following:
- File: an executable flag, and arbitrary data for contents
- Directory: mapping of names to child file system objects
- [Symbolic link][symlink]: may point anywhere.
We call a store object's outermost file system object the *root*.
data FileSystemObject
= File { isExecutable :: Bool, contents :: Bytes }
| Directory { entries :: Map FileName FileSystemObject }
| SymLink { target :: Path }
Examples:
- a directory with contents
/nix/store/<hash>-hello-2.10
├── bin
│ └── hello
└── share
├── info
│ └── hello.info
└── man
└── man1
└── hello.1.gz
- a directory with relative symlink and other contents
/nix/store/<hash>-go-1.16.9
├── bin -> share/go/bin
├── nix-support/
└── share/
- a directory with absolute symlink
/nix/store/d3k...-nodejs
└── nix_node -> /nix/store/f20...-nodejs-10.24.
A bare file or symlink can be a root file system object.
Examles:
/nix/store/<hash>-hello-2.10.tar.gz
/nix/store/4j5...-pkg-config-wrapper-0.29.2-doc -> /nix/store/i99...-pkg-config-0.29.2-doc
Symlinks pointing outside of their own root or to a store object without a matching reference are allowed, but might not function as intended.
Examples:
- an arbitrarily symlinked file may change or not exist at all
/nix/store/<hash>-foo
└── foo -> /home/foo
- if a symlink to a store path was not automatically created by Nix, it may be invalid or get invalidated when the store object is deleted
/nix/store/<hash>-bar
└── bar -> /nix/store/abc...-foo
[symlink]: https://en.m.wikipedia.org/wiki/Symbolic_link
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