Check for reinstalls as in install_pkg_names

This is actually added for YALI. YALI now gives all the packages with
their full paths. But when an exception happens and retry is selected
from YALI, to continue the packages where YALI left pisi has to check
the list and should not install the already installed packages as done
in install_pkg_names.

pisi/operations/install.py

@@ -10,6 +10,7 @@
 # Please read the COPYING file.
 #
 
+import os
 import sys
 
 import gettext
@@ -111,12 +112,28 @@ def install_pkg_names(A, reinstall = False):
 def install_pkg_files(package_URIs, reinstall = False):
     """install a number of pisi package files"""
 
+    installdb = pisi.db.installdb.InstallDB()
     ctx.ui.debug('A = %s' % str(package_URIs))
 
     for x in package_URIs:
         if not x.endswith(ctx.const.package_suffix):
             raise Exception(_('Mixing file names and package names not supported yet.'))
 
+    # filter packages that are already installed
+    tobe_installed, already_installed = [], set()
+    if not reinstall:
+        for x in package_URIs:
+            if not x.endswith(ctx.const.delta_package_suffix) and x.endswith(ctx.const.package_suffix):
+                pkg_name, pkg_version = pisi.util.parse_package_name(os.path.basename(x))
+                if installdb.has_package(pkg_name):
+                    already_installed.add(pkg_name)
+                else:
+                    tobe_installed.append(x)
+        if already_installed:
+            ctx.ui.warning(_("The following package(s) are already installed and are not going to be installed again:\n") +
+                           util.strlist(already_installed))
+        package_URIs = tobe_installed
+
     if ctx.config.get_option('ignore_dependency'):
         # simple code path then
         for x in package_URIs: