commit: 4eb2ccf9c7bc7eaa64754e9b432290ba5ed631e9 Author: Michał Górny <mgorny <AT> gentoo <DOT> org> AuthorDate: Wed Oct 4 16:42:13 2017 +0000 Commit: Michał Górny <mgorny <AT> gentoo <DOT> org> CommitDate: Wed Oct 4 16:47:48 2017 +0000 URL: https://gitweb.gentoo.org/proj/pms.git/commit/?id=4eb2ccf9
EAPI 7 has binding leftmost-of dep groups (||=). Bug: https://bugs.gentoo.org/489458 dependencies.tex | 45 ++++++++++++++++++++++++++++++++++++++------- eapi-differences.tex | 4 ++++ 2 files changed, 42 insertions(+), 7 deletions(-) diff --git a/dependencies.tex b/dependencies.tex index 5773aef..d9592d9 100644 --- a/dependencies.tex +++ b/dependencies.tex @@ -98,6 +98,12 @@ be surrounded on both sides by whitespace, except at the start and end of the st of (a dependency item of any kind followed by whitespace), followed by a close parenthesis. More formally: \t{any-of} \t{::=} \t{'||' whitespace '(' whitespace (item whitespace)* ')'}. Permitted in \t{DEPEND}, \t{BDEPEND}, \t{RDEPEND}, \t{PDEPEND}, \t{LICENSE}, \t{REQUIRED_USE}. +\item \featurelabel{binding-leftmost-of} A binding leftmost-of group, which consists of the string + \t{||=}, followed by whitespace, followed by an open parenthesis, followed by whitespace, + followed by zero or more of (a dependency item of any kind followed by whitespace), followed by + a close parenthesis. More formally: \t{any-of} \t{::=} \t{'||=' whitespace '(' whitespace (item + whitespace)* ')'}. Permitted in \t{DEPEND}, \t{BDEPEND}, \t{RDEPEND}, \t{PDEPEND} in EAPIs + listed in table~\ref{tab:dep-group-table} as supporting \t{||=}\ groups. \item An exactly-one-of group, which consists of the string \t{\textasciicircum\textasciicircum}, followed by whitespace, followed by an open parenthesis, followed by whitespace, followed by zero or more of (a dependency item of any kind followed by whitespace), followed by a close @@ -109,7 +115,7 @@ be surrounded on both sides by whitespace, except at the start and end of the st zero or more of (a dependency item of any kind followed by whitespace), followed by a close parenthesis. More formally: \t{at-most-one-of} \t{::=} \t{'??'\ whitespace '(' whitespace (item whitespace)* ')'}. Permitted in \t{REQUIRED_USE} in EAPIs listed in - table~\ref{tab:at-most-one-of-table} as supporting \t{REQUIRED_USE ??}\ groups. + table~\ref{tab:dep-group-table} as supporting \t{REQUIRED_USE ??}\ groups. \item A use-conditional group, which consists of an optional exclamation mark, followed by a use flag name, followed by a question mark, followed by whitespace, followed by an open parenthesis, followed by whitespace, followed by zero or more of (a dependency item @@ -150,15 +156,17 @@ In particular, note that whitespace is not optional. \end{centertable} \ChangeWhenAddingAnEAPI{7} -\begin{centertable}{EAPIs supporting \t{REQUIRED_USE ??}\ groups} - \label{tab:at-most-one-of-table} - \begin{tabular}{ll} +\begin{centertable}{EAPIs supporting additional group types} + \label{tab:dep-group-table} + \begin{tabular}{lll} \toprule \multicolumn{1}{c}{\textbf{EAPI}} & - \multicolumn{1}{c}{\textbf{Supports \t{REQUIRED_USE ??}\ groups?}} \\ + \multicolumn{1}{c}{\textbf{Supports \t{REQUIRED_USE ??}\ groups?}} & + \multicolumn{1}{c}{\textbf{Supports \t{||=}\ groups?}} \\ \midrule - 0, 1, 2, 3, 4 & No \\ - 5, 6, 7 & Yes \\ + 0, 1, 2, 3, 4 & No & No \\ + 5, 6 & Yes & No \\ + 7 & Yes & Yes \\ \bottomrule \end{tabular} \end{centertable} @@ -186,6 +194,29 @@ considered to be matched if its associated package dependency specification is n An empty any-of group counts as being matched. +\subsection{Binding leftmost-of dependency specifications} + +Any use-conditional group that is an immediate child of a binding leftmost-of group, if not enabled +(disabled for an exclamation mark prefixed use flag name), is not considered a member of the binding +leftmost-of group for match purposes. + +In a binding leftmost-of group, at least one immediate child element must be matched. A blocker is +considered to be matched if its associated package dependency specification is not matched. +In addition, for runtime dependencies, indicates that the package will break unless the dependency +corresponding to the first immediate child (in order of listing) matched in \t{ESYSROOT} at the time +the package was built is satisfied. + +An empty binding leftmost-of group counts as being matched. + +To implement the binding leftmost-of operator, the package manager will need to store which of +the immediate child elements were matched. This syntax is only for package manager use and must not +be used by ebuilds. Only the first matched child element needs to be indicated. + +Whenever the binding leftmost-of group is used in an enabled dependency group, the dependencies +(\t{DEPEND}) must ensure that at least one of the immediate child elements is also matched at build +time. It is invalid to use the binding leftmost-of group inside PDEPEND or inside any-of dependency +specifications. + \subsection{Exactly-one-of dependency specifications} Any use-conditional group that is an immediate child of an exactly-one-of group, if not enabled diff --git a/eapi-differences.tex b/eapi-differences.tex index 87ce708..a89f5f8 100644 --- a/eapi-differences.tex +++ b/eapi-differences.tex @@ -41,6 +41,9 @@ of this document for a complete table of previous EAPIs. \bottomrule \endlastfoot +\t{||=} dependency group & \compactfeatureref{binding-leftmost-of} & + No & No & No & No & Yes \\ + \t{REQUIRED_USE} autoenforced & \compactfeatureref{auto-req-use} & No & No & No & No & Yes \\ @@ -467,6 +470,7 @@ EAPI 7 is EAPI 6 with the following changes: \featureref{nonfatal-fallback}. \item \t{die} guaranteed to work in a subshell environment, \featureref{subshell-die}. \item automatic enforcing of \t{REQUIRED_USE} is supported, \featureref{auto-req-use}. +\item binding leftmost-of (\t{||=}) dependency group is supported, \featureref{binding-leftmost-of}. \end{compactitem} \ChangeWhenAddingAnEAPI{7}
