client: preserve ownership when copying files to slot directory.

svn path=/trunk/boinc/; revision=16827

checkin_notes

@@ -37,3 +37,9 @@ Janus   Jan 6 2009
     locales/da
 	BOINC-Manager.po
 
+Charlie Jan 6 2009
+    client: preserve ownership when copying files to slot directory. Fixes
+        a problem with Enigma@home which uses the <copy_file/> tag.
+
+    lib/
+        filesys.cpp

lib/filesys.cpp

@@ -505,7 +505,7 @@ int boinc_copy(const char* orig, const char* newf) {
     return system(cmd);
 #else
     char cmd[1024];
-    sprintf(cmd, "cp \"%s\" \"%s\"", orig, newf);
+    sprintf(cmd, "cp -p \"%s\" \"%s\"", orig, newf);
     return system(cmd);
 #endif
 }