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-# Store Path
-
-Nix implements [references](store.md#reference) to [store objects](store.md#store-object) as *store paths*.
-
-Store paths are pairs of
-
-- a 20-byte [digest](#digest) for identification
-- a symbolic name for people to read.
-
-Example:
-
-- digest: `b6gvzjyb2pg0kjfwrjmg1vfhh54ad73z`
-- name:   `firefox-33.1`
-
-It is rendered to a file system path as the concatenation of
-
-  - [store directory](#store-directory)
-  - path-separator (`/`)
-  - [digest](#digest) rendered in a custom variant of [base-32](https://en.m.wikipedia.org/wiki/Base32) (20 arbitrary bytes become 32 ASCII characters)
-  - hyphen (`-`)
-  - name
-
-Example:
-
-      /nix/store/b6gvzjyb2pg0kjfwrjmg1vfhh54ad73z-firefox-33.1
-      |--------| |------------------------------| |----------|
-    store directory            digest                 name
-
-## Store Directory
-
-Every [store](./store.md) has a store directory.
-
-If the store has a [file system representation](./store.md#files-and-processes), this directory contains the store’s [file system objects](#file-system-object), which can be addressed by [store paths](#store-path).
-
-This means a store path is not just derived from the referenced store object itself, but depends on the store the store object is in.
-
-> **Note**
-> The store directory defaults to `/nix/store`, but is in principle arbitrary.
-
-It is important which store a given store object belongs to:
-Files in the store object can contain store paths, and processes may read these paths.
-Nix can only guarantee [referential integrity](store/closure.md) if store paths do not cross store boundaries.
-
-Therefore one can only copy store objects to a different store if
-
-- the source and target stores' directories match
-
-  or
-
-- the store object in question has no references, that is, contains no store paths.
-
-One cannot copy a store object to a store with a different store directory.
-Instead, it has to be rebuilt, together with all its dependencies.
-It is in general not enough to replace the store directory string in file contents, as this may render executables unusable by invalidating their internal offsets or checksums.
-
-# Digest
-
-In a [store path](#store-path), the [digest][digest] is the output of a [cryptographic hash function][hash] of either all *inputs* involved in building the referenced store object or its actual *contents*.
-
-Store objects are therefore said to be either [input-addressed](#input-addressing) or [content-addressed](#content-addressing).
-
-> **Historical Note**
-> The 20 byte restriction is because originally digests were [SHA-1][sha-1] hashes.
-> Nix now uses [SHA-256][sha-256], and longer hashes are still reduced to 20 bytes for compatibility.
-
-[digest]: https://en.m.wiktionary.org/wiki/digest#Noun
-[hash]: https://en.m.wikipedia.org/wiki/Cryptographic_hash_function
-[sha-1]: https://en.m.wikipedia.org/wiki/SHA-1
-[sha-256]: https://en.m.wikipedia.org/wiki/SHA-256
-
-### Reference scanning
-
-When a new store object is built, Nix scans its file contents for store paths to construct its set of references.
-
-The special format of a store path's [digest](#digest) allows reliably detecting it among arbitrary data.
-Nix uses the [closure](store.md#closure) of build inputs to derive the list of allowed store paths, to avoid false positives.
-
-This way, scanning files captures run time dependencies without the user having to declare them explicitly.
-Doing it at build time and persisting references in the store object avoids repeating this time-consuming operation.
-
-> **Note**
-> In practice, it is sometimes still necessary for users to declare certain dependencies explicitly, if they are to be preserved in the build result's closure.
-This depends on the specifics of the software to build and run.
->
-> For example, Java programs are compressed after compilation, which obfuscates any store paths they may refer to and prevents Nix from automatically detecting them.
-
-## Input Addressing
-
-Input addressing means that the digest derives from how the store object was produced, namely its build inputs and build plan.
-
-To compute the hash of a store object one needs a deterministic serialisation, i.e., a binary string representation which only changes if the store object changes.
-
-Nix has a custom serialisation format called Nix Archive (NAR)
-
-Store object references of this sort can *not* be validated from the content of the store object.
-Rather, a cryptographic signature has to be used to indicate that someone is vouching for the store object really being produced from a build plan with that digest.
-
-## Content Addressing
-
-Content addressing means that the digest derives from the store object's contents, namely its file system objects and references.
-If one knows content addressing was used, one can recalculate the reference and thus verify the store object.
-
-Content addressing is currently only used for the special cases of source files and "fixed-output derivations", where the contents of a store object are known in advance.
-Content addressing of build results is still an [experimental feature subject to some restrictions](https://github.com/tweag/rfcs/blob/cas-rfc/rfcs/0062-content-addressed-paths.md).
-