util-vserver-0.30.208

[util-vserver.git] / lib / getvserverbyctx-compat.hc

diff --git a/lib/getvserverbyctx-compat.hc b/lib/getvserverbyctx-compat.hc
new file mode 100644 (file)
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+++ b/lib/getvserverbyctx-compat.hc
@@ -0,0 +1,114 @@
+// $Id: getvserverbyctx-compat.hc,v 1.3 2004/06/27 13:01:28 ensc Exp $    --*- c -*--
+
+// Copyright (C) 2003 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
+//  
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; version 2 of the License.
+//  
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//  
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include "vserver.h"
+#include "internal.h"
+#include "pathconfig.h"
+#include "compat-c99.h"
+
+#include <string.h>
+#include <unistd.h>
+
+#ifdef VC_ENABLE_API_COMPAT
+#include <dirent.h>
+#include <sys/types.h>
+
+
+static char *
+handleLegacy(xid_t xid)
+{
+  DIR                  *dir = opendir(DEFAULT_PKGSTATEDIR);
+  struct dirent                *ep;
+  char *               result = 0;
+  
+  if (dir==0) return 0;
+  while ((ep=readdir(dir))!=0) {
+    char * const               name = ep->d_name;
+    size_t                     l    = name ? strlen(name) : 0;
+    xid_t                      cur_xid;
+
+    if (l<=4 || strcmp(name+l-4, ".ctx")!=0) continue;
+    name[l-4]   = '\0';
+    cur_xid = vc_getVserverCtx(name, vcCFG_LEGACY, false, 0);
+    if (cur_xid!=xid) continue;
+
+    result      = strdup(name);
+    break;
+  }
+
+  closedir(dir);
+  return result;
+}
+#else
+static inline char *
+handleLegacy(xid_t UNUSED xid)
+{
+  return 0;
+}
+#endif
+
+static char *
+vc_getVserverByCtx_compat(xid_t ctx, vcCfgStyle *style, char const *revdir)
+{
+  if (revdir==0) revdir = DEFAULT_PKGSTATEREVDIR;
+
+  {
+  vcCfgStyle   cur_style = vcCFG_NONE;
+  size_t       l = strlen(revdir);
+  size_t       l1;
+  char         path[l + sizeof(unsigned int)*3 + 3];
+
+  strcpy(path, revdir);
+  path[l]      = '/';
+  l1 = utilvserver_fmt_uint(path+l+1, ctx);
+  path[l+1+l1] = '\0';
+
+  if (style==0 || *style==vcCFG_AUTO) {
+    if (access(path, F_OK)==0) cur_style = vcCFG_RECENT_FULL;
+    else                       cur_style = vcCFG_LEGACY;
+  }
+  else
+    cur_style = *style;
+
+  switch (cur_style) {
+    case vcCFG_RECENT_SHORT    :
+    case vcCFG_RECENT_FULL     :
+       // check if expected ctx == actual ctx
+      if (vc_getVserverCtx(path, vcCFG_RECENT_FULL, false, 0)!=ctx) return 0;
+
+      if (style) *style = vcCFG_RECENT_FULL;
+      return strdup(path);
+       // TODO: handle legacy
+    case vcCFG_LEGACY          :
+    {
+      char *   tmp = handleLegacy(ctx);
+      if (tmp && style)
+       *style = vcCFG_LEGACY;
+
+      return tmp;
+    }
+      
+    default            :
+      return 0;
+  }
+  }
+}