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\chapter{Metadata Cache}
\label{ch:metadata-cache}
\section{Directory Contents}
The \t{metadata/cache} directory, if it exists, contains directories whose names are the same as
categories in the repository. Each subdirectory may optionally contain one file per package version
in that category, named \t{<package>-<version>}, in the format described below.
The metadata cache may be incomplete or non-existent, and may contain additional bogus entries.
\section{Cache File Format}
Each cache file contains the textual values of various metadata keys, one per line, in the following
order. Other lines may be present following these; their meanings are not defined here.
\begin{compactenum}
\item Build-time dependencies (\t{DEPEND})
\item Run-time dependencies (\t{RDEPEND})
\item Slot (\t{SLOT})
\item Source tarball URIs (\t{SRC_URI})
\item \t{RESTRICT}
\item Package homepage (\t{HOMEPAGE})
\item Package license (\t{LICENSE})
\item Package description (\t{DESCRIPTION})
\item Package keywords (\t{KEYWORDS})
\item Inherited eclasses (\t{INHERITED})
\item Use flags that this package respects (\t{IUSE})
\item Use flags that this package requires (\t{REQUIRED_USE}).
Blank in some EAPIs; see table~\ref{tab:optional-vars-table}.
\item Post dependencies (\t{PDEPEND})
\item Build-time dependencies for \t{CBUILD} host (\t{BDEPEND}).
Blank in some EAPIs; see table~\ref{tab:depend-table}.
\item The ebuild API version to which this package conforms (\t{EAPI})
\item Properties (\t{PROPERTIES}). In some EAPIs, may optionally be blank, regardless of ebuild
metadata; see table~\ref{tab:optional-vars-table}.
\item Defined phases (\t{DEFINED_PHASES}). In some EAPIs, may optionally be blank, regardless of
ebuild metadata; see table~\ref{tab:defined-phases-table}.
\item Install-time dependencies (\t{IDEPEND}).
Blank in some EAPIs; see table~\ref{tab:depend-table}.
\item Blank lines to pad the file to 22 lines long
\end{compactenum}
Future EAPIs may define new variables, remove existing variables, change the line number or
format used for a particular variable, add or reduce the total length of the file and so on.
Any future EAPI that uses this cache format will continue to place the EAPI value on line~15 if
such a concept makes sense for that EAPI, and will place a value that is clearly not a supported
EAPI on line~15 if it does~not.
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