NAME
Edos-pscheck - Check satisfiability of pkgsrc package dependencies
SYNOPSIS
edos-pscheck [option] ... pkg-summary-file
DESCRIPTION
edos-pscheck reads package descriptions from a file in the pkg_summary
format of NetBSD. We say that a package is identified by the pair
consisting of the package name and of the package version.
A package (called goal) is called installable with respect to a set of
packages if there exists a subset of the packages that
- contains at most one version for each package name
- contains the goal package (in any version, or a specific version)
- all packages of the subset have their dependencies and conflicts
satisfied in this subset.
Edos-psmcheck checks whether every package in the set is installable
with respect to the input set of packages. Specific versions can be
specified by following the package name with the sign '=' and the
version of the package (for instance, 'xemacs21=21.4.17-1'). If no
package name is given as argument then all packages of the input set
are checked for satisfiability.
The constraint solving algorithm is complete, that is it finds a
solution whenever there exists one, even for multiple disjunctive
dependencies and deep package conflicts. This problem is
computationally infeasible in theory (that is, NP-complete), but can in
practice be solved very efficiently.
OPTIONS
-explain
Explain the results
-rules Print generated rules
-failures
Only show failures
-successes
Only show successes
-base file
Specifiy an additional file providing packages that are not
checked but used for resolving dependencies
-quiet Supress warnings and progress/timing messages
-xml Output results in XML format
-help, --help
Display this list of options
EXAMPLE
Check which packages in a particular distribution are not installable
and why:
edos-pscheck -failures -explain pkg_summary
where pkg_summary is the file pertaining to that distribution.
AUTHOR
Edos-pscheck has been written by Jerome Vouillon and Jaap Boender for
the EDOS and Mancoosi projects. This man-page has been compiled by Ralf
Treinen.
SEE ALSO
<http://www.edos-project.org> is the home page of the EDOS project.
edos-debcheck(1) and edos-rpmcheck(1) are the analogous tool for debian
and rpm packages.