xattr: add configure check and #ifdefs

setxattr is a glibc call to set extended attributes, so configure now
checks for it and the code is adapted to only build when the
functionality is present.

src/main.c

@@ -5648,12 +5648,10 @@ operate(struct Configurable *config, int argc, argv_item_t argv[])
         }
 
         if(config->xattr && outs.filename) {
-          char *url = NULL;
-          curl_easy_getinfo(curl, CURLINFO_EFFECTIVE_URL, &url);
-          int err = write_xattr( curl, outs.filename );
-          if (err) {
-            warnf( config, "Error setting extended attributes: %s\n", strerror(errno) );
-          }
+          int err = write_xattr(curl, outs.filename );
+          if(err)
+            warnf( config, "Error setting extended attributes: %s\n",
+                   strerror(errno) );
         }
 
 #ifdef HAVE_UTIME

src/xattr.c

@@ -1,9 +1,35 @@
-#include <sys/types.h>
-#include <sys/xattr.h> /* include header from libc, not from libattr */
-#include <string.h>
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 2010, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+/* client-local setup.h */
+#include "setup.h"
 #include <curl/curl.h>
 #include "xattr.h"
 
+#ifdef HAVE_SETXATTR
+#include <sys/types.h>
+#include <string.h>
+#include <sys/xattr.h> /* include header from libc, not from libattr */
+
 /* mapping table of curl metadata to extended attribute names */
 static struct xattr_mapping {
   char *attr; /* name of the xattr */
@@ -20,7 +46,7 @@ static struct xattr_mapping {
 /* store metadata from the curl request alongside the downloaded
  * file using extended attributes
  */
-int write_xattr( CURL *curl, const char *filename )
+int write_xattr(CURL *curl, const char *filename)
 {
   int i = 0;
   int err = 0;
@@ -35,3 +61,11 @@ int write_xattr( CURL *curl, const char *filename )
   }
   return err;
 }
+#else
+int write_xattr(CURL *curl, const char *filename)
+{
+  (void)curl;
+  (void)filename;
+  return 0;
+}
+#endif

src/xattr.h

@@ -1 +1,26 @@
+#ifndef __XATTR_H
+#define __XATTR_H
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 2010, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
 int write_xattr( CURL *curl, const char *filename );
+
+#endif