[PATCH setup 1/2] Improve the preparation of the package database

[Ken Brown]

Introduce a new function packagedb::noChanges() to set the database to
a "no changes requested" state.  Call it the first time the chooser
page is activated, before calling
ChooserPage::applyCommandLinePackageSelection().

Also use it to simplify the code in two places.

Remove code from ChooserPage::changeTrust() that was making changes to
the database after ChooserPage::applyCommandLinePackageSelection() had
already been called.
---
 choose.cc     | 26 ++++++--------------------
 libsolv.cc    | 11 +++--------
 package_db.cc | 12 ++++++++++++
 package_db.h  |  2 ++
 4 files changed, 23 insertions(+), 28 deletions(-)

diff --git a/choose.cc b/choose.cc
index 1249efa..51d2fb6 100644
--- a/choose.cc
+++ b/choose.cc
@@ -329,6 +329,7 @@ ChooserPage::OnActivate()
     {
       // Do things which should only happen once, but rely on packagedb being
       // ready to use, so OnInit() is too early
+      db.noChanges();
       applyCommandLinePackageSelection();
       initialUpdateState();
 
@@ -392,13 +393,7 @@ ChooserPage::keepClicked()
 {
   update_mode_id = IDC_CHOOSE_KEEP;
   packagedb db;
-  for (packagedb::packagecollection::iterator i = db.packages.begin ();
-        i != db.packages.end (); ++i)
-    {
-      packagemeta & pkg = *(i->second);
-      pkg.desired = pkg.installed;
-      pkg.pick(false);
-    }
+  db.noChanges();
   chooser->refresh();
 }
 
@@ -431,20 +426,11 @@ ChooserPage::changeTrust(int button, bool test, bool 
initial)
 
   // usually we want to apply the solver to an empty task list to get the list
   // of packages to upgrade (if any)
+  // but initially we want a task list with any package changes caused by
+  // command line options
   if (initial)
-    {
-      // but initially we want a task list with any package changes caused by
-      // command line options
-      // (also note the installed version to avoid generating spurious taskKeep
-      // or taskSkip tasks)
-      for (packagedb::packagecollection::iterator p = db.packages.begin ();
-           p != db.packages.end (); ++p)
-        {
-          packagemeta *pkg = p->second;
-          pkg->default_version = pkg->installed;
-        }
-      q.setTasks();
-    }
+    q.setTasks();
+
   db.defaultTrust(q, mode, test);
 
   // configure PickView so 'test' or 'curr' version is chosen when an
diff --git a/libsolv.cc b/libsolv.cc
index 2eb04e2..11394a2 100644
--- a/libsolv.cc
+++ b/libsolv.cc
@@ -658,14 +658,9 @@ void
 SolverSolution::trans2db() const
 {
   packagedb db;
-  // First reset all packages to the "no change" state
-  for (packagedb::packagecollection::iterator i = db.packages.begin();
-       i != db.packages.end(); i++)
-    {
-      packagemeta *pkg = i->second;
-      pkg->desired = pkg->default_version = pkg->installed;
-      pkg->pick(false);
-    }
+  // First reset all packages to the "no changes" state
+  db.noChanges ();
+
   // Now make changes according to trans.  transErase requires some
   // care; it could either be a "plain" uninstall, or it could be
   // paired with a transInstall for an upgrade/downgrade or reinstall.
diff --git a/package_db.cc b/package_db.cc
index d12e841..9189e40 100644
--- a/package_db.cc
+++ b/package_db.cc
@@ -750,3 +750,15 @@ packagedb::prep()
 
   prepped = true;
 }
+
+void
+packagedb::noChanges ()
+{
+  for (packagecollection::iterator i = packages.begin();
+       i != packages.end(); i++)
+    {
+      packagemeta *pkg = i->second;
+      pkg->desired = pkg->default_version = pkg->installed;
+      pkg->pick(false);
+    }
+}
diff --git a/package_db.h b/package_db.h
index e500e4b..da73171 100644
--- a/package_db.h
+++ b/package_db.h
@@ -68,6 +68,8 @@ public:
   /* 0 on success */
   int flush ();
   void prep();
+  /* Set the database to a "no changes requested" state.  */
+  void noChanges ();
 
   packagemeta * findBinary (PackageSpecification const &) const;
   packageversion findBinaryVersion (PackageSpecification const &) const;
-- 
2.16.2