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doc: Add note on store immutability.

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* doc/guix.texi (The Store): Mention "store items" and the database
location.  Add note on the store's immutability.
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Ludovic Courtès 2016-03-09 14:47:31 +01:00
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doc/guix.texi
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@ -2878,20 +2878,34 @@ with @code{build-expression->derivation} (@pxref{Derivations,
@section The Store
@cindex store
@cindex store items
@cindex store paths
Conceptually, the @dfn{store} is the place where derivations that have
been built successfully are stored---by default, @file{/gnu/store}.
Sub-directories in the store are referred to as @dfn{store paths}. The
store has an associated database that contains information such as the
store paths referred to by each store path, and the list of @emph{valid}
store paths---paths that result from a successful build.
Sub-directories in the store are referred to as @dfn{store items} or
sometimes @dfn{store paths}. The store has an associated database that
contains information such as the store paths referred to by each store
path, and the list of @emph{valid} store items---results of successful
builds. This database resides in @file{/var/guix/db} (or under whatever
state directory was specified @i{via} @option{--localstatedir} at
configure time).
The store is always accessed by the daemon on behalf of its clients
The store is @emph{always} accessed by the daemon on behalf of its clients
(@pxref{Invoking guix-daemon}). To manipulate the store, clients
connect to the daemon over a Unix-domain socket, send requests to it,
and read the result---these are remote procedure calls, or RPCs.
@quotation Note
Users must @emph{never} modify files under @file{/gnu/store} directly.
This would lead to inconsistencies and break the immutability
assumptions of Guix's functional model (@pxref{Introduction}).
@xref{Invoking guix gc, @command{guix gc --verify}}, for information on
how to check the integrity of the store and attempt recovery from
accidental modifications.
@end quotation
The @code{(guix store)} module provides procedures to connect to the
daemon, and to perform RPCs. These are described below.