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author | Ulrich Müller <ulm@gentoo.org> | 2022-02-13 17:25:14 +0100 |
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committer | Ulrich Müller <ulm@gentoo.org> | 2022-02-13 17:25:14 +0100 |
commit | 2be267efa07e60e3ec5d0ef55c66778ef20362ff (patch) | |
tree | 945220f847f2ccdccded15586b6f2b818af31ee9 /ebuild-environment.tex | |
parent | pms.tex: Update copyright years (diff) | |
download | pms-2be267efa07e60e3ec5d0ef55c66778ef20362ff.tar.gz pms-2be267efa07e60e3ec5d0ef55c66778ef20362ff.tar.bz2 pms-2be267efa07e60e3ec5d0ef55c66778ef20362ff.zip |
ebuild-environment.tex: Consolidate source files
These small sections need not be in their own file. No change of
wording.
Signed-off-by: Ulrich Müller <ulm@gentoo.org>
Diffstat (limited to 'ebuild-environment.tex')
-rw-r--r-- | ebuild-environment.tex | 79 |
1 files changed, 77 insertions, 2 deletions
diff --git a/ebuild-environment.tex b/ebuild-environment.tex index 82c036c..b9f3622 100644 --- a/ebuild-environment.tex +++ b/ebuild-environment.tex @@ -2,9 +2,84 @@ \input{ebuild-env-vars.tex} -\input{ebuild-env-state.tex} +\section{The State of Variables Between Functions} +\label{sec:ebuild-env-state} -\input{ebuild-env-invariancy.tex} +Exported and default scope variables are saved between functions. A non-local variable set in a +function earlier in the call sequence must have its value preserved for later functions, including +functions executed as part of a later uninstall. + +\note{\t{pkg_pretend} is \emph{not} part of the normal call sequence, and does not take part in +environment saving.} + +Variables that were exported must remain exported in later functions; variables with default +visibility may retain default visibility or be exported. Variables with special meanings to the +package manager are excluded from this rule. + +Global variables must only contain invariant values (see~\ref{sec:metadata-invariance}). If a global +variable's value is invariant, it may have the value that would be generated at any given point +in the build sequence. + +This is demonstrated by code listing~\ref{lst:env-saving}. + +\begin{listing} +\caption{Environment state between functions} \label{lst:env-saving} +\begin{verbatim} +GLOBAL_VARIABLE="a" + +src_compile() +{ + GLOBAL_VARIABLE="b" + DEFAULT_VARIABLE="c" + export EXPORTED_VARIABLE="d" + local LOCAL_VARIABLE="e" +} + +src_install(){ + [[ ${GLOBAL_VARIABLE} == "a" ]] \ + || [[ ${GLOBAL_VARIABLE} == "b" ]] \ + || die "broken env saving for globals" + + [[ ${DEFAULT_VARIABLE} == "c" ]] \ + || die "broken env saving for default" + + [[ ${EXPORTED_VARIABLE} == "d" ]] \ + || die "broken env saving for exported" + + [[ $(printenv EXPORTED_VARIABLE ) == "d" ]] \ + || die "broken env saving for exported" + + [[ -z ${LOCAL_VARIABLE} ]] \ + || die "broken env saving for locals" +} +\end{verbatim} +\end{listing} + +\section{The State of the System Between Functions} + +For the sake of this section: +\nobreakpar +\begin{compactitem} +\item Variancy is any package manager action that modifies either \t{ROOT} or \t{/} in any way that + isn't merely a simple addition of something that doesn't alter other packages. This includes + any non-default call to any \t{pkg} phase function except \t{pkg_setup}, a merge of any package + or an unmerge of any package. +\item As an exception, changes to \t{DISTDIR} do not count as variancy. +\item The \t{pkg_setup} function may be assumed not to introduce variancy. Thus, ebuilds must not + perform variant actions in this phase. +\end{compactitem} + +The following exclusivity and invariancy requirements are mandated: +\nobreakpar +\begin{compactitem} +\item No variancy shall be introduced at any point between a package's \t{pkg_setup} being started + up to the point that that package is merged, except for any variancy introduced by that package. +\item There must be no variancy between a package's \t{pkg_setup} and a package's \t{pkg_postinst}, + except for any variancy introduced by that package. +\item Any non-default \t{pkg} phase function must be run exclusively. +\item Each phase function must be called at most once during the build process for any given + package. +\end{compactitem} % vim: set filetype=tex fileencoding=utf8 et tw=100 spell spelllang=en : |