'\" t
.\" Title: Libsolv-Pool
.\" Author: [see the "Author" section]
-.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
-.\" Date: 05/06/2016
+.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
+.\" Date: 09/04/2017
.\" Manual: LIBSOLV
.\" Source: libsolv
.\" Language: English
.\"
-.TH "LIBSOLV\-POOL" "3" "05/06/2016" "libsolv" "LIBSOLV"
+.TH "LIBSOLV\-POOL" "3" "09/04/2017" "libsolv" "LIBSOLV"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
A conditional dependency, the \(lqname\(rq sub\-dependency is only considered if the \(lqevr\(rq sub\-dependency is fulfilled\&. See the section about boolean dependencies about more information\&.
.RE
.PP
+\fBREL_UNLESS\fR
+.RS 4
+A conditional dependency, the \(lqname\(rq sub\-dependency is only considered if the \(lqevr\(rq sub\-dependency is not fulfilled\&. See the section about boolean dependencies about more information\&.
+.RE
+.PP
\fBREL_COMPAT\fR
.RS 4
A compat dependency used in Haiku to represent version ranges\&. The \(lqname\(rq part is the actual version, the \(lqevr\(rq part is the backwards compatibility version\&.
.RE
+.PP
+\fBREL_KIND\fR
+.RS 4
+A pseudo dependency that limits the solvables to a specific kind\&. The kind is expected to be a prefix of the solvable name, e\&.g\&. \(lqpatch:foo\(rq would be of kind \(lqpatch\(rq\&. \(lqREL_KIND\(rq is only supported in the selection functions\&.
+.RE
+.PP
+\fBREL_MULTIARCH\fR
+.RS 4
+A debian multiarch annotation\&. The most common value for the \(lqevr\(rq part is \(lqany\(rq\&.
+.RE
+.PP
+\fBREL_ELSE\fR
+.RS 4
+The else part of a \(lqREL_COND\(rq or \(lqREL_UNLESS\(rq dependency\&. See the section about boolean dependencies\&.
+.RE
+.PP
+\fBREL_ERROR\fR
+.RS 4
+An illegal dependency\&. This is useful to encode dependency parse errors\&.
+.RE
.SS "Functions"
.sp
.if n \{\
You can turn off the architecture replacement checks with the Solver\(cqs SOLVER_FLAG_ALLOW_VENDORCHANGE flag\&.
.SH "BOOLEAN DEPENDENCIES"
.sp
-Boolean Dependencies allow to build complex expressions from simple dependencies\&. While rpm does not support boolean expressions in dependencies and debian only allows an "OR" expression, libsolv allows arbitrary complex expressions\&. The following basic types are supported:
+Boolean Dependencies allow to build complex expressions from simple dependencies\&. Note that depending on the package manager only a subset of those may be useful\&. For example, debian currently only allows an "OR" expression\&.
.PP
\fBREL_OR\fR
.RS 4
.PP
\fBREL_AND\fR
.RS 4
-The expression is true if both dependencies are true\&. The packages fulfilling the dependencies may be different, i\&.e\&. \(lqSupplements: perl AND python\(rq is true if both a package providing perl and a package providing python are installed\&. The solver currently only supports REL_AND in Supplements/Enhances dependencies, in other types of dependencies it gets treated as REL_WITH\&.
+The expression is true if both dependencies are true\&. The packages fulfilling the dependencies may be different, i\&.e\&. \(lqSupplements: perl REL_AND python\(rq is true if both a package providing perl and a package providing python are installed\&.
.RE
.PP
\fBREL_WITH\fR
.RS 4
-The expression is true if both dependencies are true and are fulfilled by the same package\&. Thus \(lqSupplements: perl AND python\(rq would only be true if a package is installed that provides both dependencies (some kind of multi\-language interpreter)\&.
+The expression is true if both dependencies are true and are fulfilled by the same package\&. Thus \(lqSupplements: perl REL_WITH python\(rq would only be true if a package is installed that provides both dependencies (some kind of multi\-language interpreter)\&.
.RE
.PP
\fBREL_COND\fR
.RS 4
-The expression is true if the first dependency is true or the second dependency is false\&. Libsolv currently does not support this type of dependency in the solver code\&.
+The expression is true if the first dependency is true or the second dependency is false\&. \(lqA REL_COND B\(rq is equivalent to \(lqA REL_OR (NOT B)\(rq (except that libsolv does not expose \(lqNOT\(rq)\&.
+.RE
+.PP
+\fBREL_UNLESS\fR
+.RS 4
+The expression is true if the first dependency is true and the second dependency is false\&. \(lqA REL_UNLESS B\(rq is equivalent to \(lqA REL_AND (NOT B)\(rq (except that libsolv does not expose \(lqNOT\(rq)\&.
+.RE
+.PP
+\fBREL_ELSE\fR
+.RS 4
+The \(lqelse\(rq part of a \(lqREL_COND\(rq or \(lqREL_UNLESS\(rq dependency\&. It has to be directly in the evr part of the condition, e\&.g\&. \(lqfoo REL_COND (bar REL_ELSE baz)\(rq\&. For \(lqREL_COND\(rq this is equivalent to writing \(lq(foo REL_COND bar) REL_AND (bar REL_OR baz)\(rq\&. For \(lqREL_UNLESS\(rq this is equivalent to writing \(lq(foo REL_UNLESS bar) REL_OR (bar REL_AND baz)\(rq\&.
.RE
.sp
Each sub\-dependency of a boolean dependency can in turn be a boolean dependency, so you can chain them to create complex dependencies\&.
projects / platform / upstream / libsolv.git / blobdiff