Add support of exclude_from_weak into Goal

Exclude_from_weak only prevents packages to be used to satisfy
recommend and supplement dependencies.

= changelog =
msg: Add support for excluding packages to be installed as weak dependencies
type: enhancement
related: https://bugzilla.redhat.com/show_bug.cgi?id=1699672

libdnf.spec

@@ -1,4 +1,4 @@
-%global libsolv_version 0.7.17
+%global libsolv_version 0.7.20
 %global libmodulemd_version 2.13.0
 %global librepo_version 1.13.1
 %global dnf_conflict 4.3.0

libdnf/goal/Goal-private.hpp

@@ -23,6 +23,7 @@
 
 #include "Goal.hpp"
 #include "IdQueue.hpp"
+#include "../sack/packageset.hpp"
 
 namespace libdnf {
 
@@ -37,6 +38,7 @@ class Goal::Impl {
 
     DnfSack *sack;
     Queue staging;
+    PackageSet exclude_from_weak;
     Solver *solv{nullptr};
     ::Transaction *trans{nullptr};
     DnfGoalActions actions{DNF_NONE};

libdnf/goal/Goal.cpp

@@ -635,7 +635,7 @@ erase_flags2libsolv(int flags)
 Goal::Goal(const Goal & goal_src) : pImpl(new Impl(*goal_src.pImpl)) {}
 
 Goal::Impl::Impl(const Goal::Impl & goal_src)
-: sack(goal_src.sack)
+: sack(goal_src.sack), exclude_from_weak(goal_src.exclude_from_weak)
 {
     queue_init_clone(&staging, const_cast<Queue *>(&goal_src.staging));
 
@@ -649,7 +649,7 @@ Goal::Impl::Impl(const Goal::Impl & goal_src)
 }
 
 Goal::Impl::Impl(DnfSack *sack)
-: sack(sack)
+: sack(sack), exclude_from_weak(sack)
 {
     queue_init(&staging);
 }
@@ -793,6 +793,18 @@ Goal::favor(DnfPackage *pkg)
     queue_push2(&pImpl->staging, SOLVER_SOLVABLE|SOLVER_FAVOR, dnf_package_get_id(pkg));
 }
 
+void
+Goal::add_exclude_from_weak(const DnfPackageSet & pset)
+{
+    pImpl->exclude_from_weak += pset;
+}
+
+void
+Goal::reset_exclude_from_weak()
+{
+    pImpl->exclude_from_weak.clear();
+}
+
 void
 Goal::disfavor(DnfPackage *pkg)
 {
@@ -1261,6 +1273,12 @@ Goal::Impl::constructJob(DnfGoalActions flags)
             elements[i] |= SOLVER_FORCEBEST;
     }
 
+    // Add weak excludes to the job
+    Id id = -1;
+    while ((id = exclude_from_weak.next(id)) != -1) {
+        job->pushBack(SOLVER_SOLVABLE|SOLVER_EXCLUDEFROMWEAK, id);
+    }
+
     /* turn off implicit obsoletes for installonly packages */
     for (int i = 0; i < (int) dnf_sack_get_installonly(sack)->count; i++)
         job->pushBack(SOLVER_MULTIVERSION|SOLVER_SOLVABLE_PROVIDES,

libdnf/goal/Goal.hpp

@@ -76,6 +76,8 @@ struct Goal {
     void install(DnfPackage *new_pkg, bool optional);
     void lock(DnfPackage *new_pkg);
     void favor(DnfPackage *new_pkg);
+    void add_exclude_from_weak(const DnfPackageSet & pset);
+    void reset_exclude_from_weak();
     void disfavor(DnfPackage *new_pkg);
 
     /**

python/hawkey/goal-py.cpp

@@ -375,6 +375,25 @@ add_protected(_GoalObject *self, PyObject *seq) try
     Py_RETURN_NONE;
 } CATCH_TO_PYTHON
 
+static PyObject *
+add_exclude_from_weak(_GoalObject *self, PyObject *seq) try
+{
+    HyGoal goal = self->goal;
+    auto pset = pyseq_to_packageset(seq, hy_goal_get_sack(goal));
+    if (!pset)
+        return NULL;
+    goal->add_exclude_from_weak(*(pset.get()));
+    Py_RETURN_NONE;
+} CATCH_TO_PYTHON
+
+static PyObject *
+reset_exclude_from_weak(_GoalObject *self, PyObject *unused) try
+{
+    HyGoal goal = self->goal;
+    goal->reset_exclude_from_weak();
+    Py_RETURN_NONE;
+} CATCH_TO_PYTHON
+
 static PyObject *
 run(_GoalObject *self, PyObject *args, PyObject *kwds) try
 {
@@ -597,6 +616,8 @@ static struct PyMethodDef goal_methods[] = {
      NULL},
     {"add_protected", (PyCFunction)add_protected, METH_O,
      NULL},
+    {"add_exclude_from_weak", (PyCFunction)add_exclude_from_weak, METH_O, NULL},
+    {"reset_exclude_from_weak", (PyCFunction)reset_exclude_from_weak, METH_NOARGS, NULL},
     {"distupgrade_all",        (PyCFunction)distupgrade_all,        METH_NOARGS,        NULL},
     {"distupgrade",                (PyCFunction)distupgrade,
      METH_VARARGS | METH_KEYWORDS, NULL},