xt-install-image: New helper function checkForCommonFilesInChroot

Don't fail on missing /bin/ls or /bin/cp, it could be on purpose

bin/xt-install-image

@@ -255,16 +255,9 @@ if ( defined( $CONFIG{ 'install-method' } ) &&
         #
         #  Test that we have some "standard" files present.
         #
-        foreach my $file (qw( /bin/ls /bin/cp ))
-        {
-            if ( !-x $CONFIG{ 'location' } . $file )
-            {
-                print "The installation of the new system has failed.\n";
-                print "\n";
-                print "The system is missing the common file: $file\n";
-                exit 1;
-            }
-        }
+
+	checkForCommonFilesInChroot($CONFIG{ 'location' },
+				    "installed system");
 
         #
         #  All done.
@@ -532,6 +525,30 @@ EOF
 
 
 
+=begin doc
+
+  Check if there are some common files in some chroot
+
+=end doc
+
+=cut
+
+sub checkForCommonFilesInChroot {
+    my ($chroot, $what) = @_;
+    foreach my $file (qw( /bin/ls /bin/cp ))
+    {
+	if ( !-x $chroot.$file )
+	{
+	    print STDERR <<EOT;
+WARNING ($0): The $what at $chroot doesn\'t seem to be a full system.
+WARNING ($0): The $what is missing the common file: $file.
+EOT
+	}
+    }
+}
+
+
+
 =begin doc
 
   A utility method to run a system command.  We will capture the return
@@ -639,6 +656,12 @@ sub copyDebFiles
 sub do_copy
 {
 
+    #
+    #  Check if the copy source has at least some "standard" files present.
+    #
+    checkForCommonFilesInChroot($CONFIG{ 'install-source' },
+				"installation source");
+
     #
     #  Find the copy command to run from the configuration file.
     #