OpenBSD::RequiredBy3p
Manage installed package dependencies
Usage
use OpenBSD::RequiredBy;# let's do things for realour $not = 0;my $o = OpenBSD::RequiredBy->new($pkgname);my $o2 = OpenBSD::Requiring->new($pkgname);print "Requirements for $pkgname are ", join(' ',$o2->list), "\n";# add some reverse dependencies$o->add($reverse_dep1, $reverse_dep2);# remove some dependency$o2->delete($dep);# forget some cache entryOpenBSD::RequiredBy->forget(installed_info($pkgname));# compute the transitive closure of some dependenciesmy @fulldeps = OpenBSD::Requiring->compute_closure($pkg1, $pkg2);
Overview
"OpenBSD::RequiredBy" handles lists of forward and reverse dependencies for installed packages.
If $main::not is true, all change operations are done internally and never written to disk.
"$o = OpenBSD::RequiredBy->new($pkgname)" gives access to the reverse dependencies, "$o =OpenBSD::Requiring->new($pkgname)" gives access to the forward dependencies.
Such an object can be used to list the dependencies "$o->list", add names to them "$o->add(name1, name2, ...)" or remove name from them "$o->delete(name1, name2, ...)".
The full list of forward dependencies (transitive closure) from a set of packages is given by "OpenBSD::RequiredBy->compute_closure($name1, name2, ...)". Likewise, "OpenBSD::Requiring->compute_closure($name1, name2, ...)" yields the list of reverse dependencies.
Those lists of dependencies trim duplicates and, unless $main::not is true, disk files are automatically synchronized whenever the lists change.
"OpenBSD::RequiredBy" maintains a cache for efficiency. When an installed package is deleted completely, "OpenBSD::RequiredBy->forget($dir)" and "OpenBSD::Requiring->forget($dir)" will remove the cache entries.
Releases
32 releases since OpenBSD 5.0; the text changed 20 times.