From fbf51696ef1435cf358943c671ac55944ccec26c Mon Sep 17 00:00:00 2001
From: Stefan Tomanek <stefan.tomanek@wertarbyte.de>
Date: Fri, 5 Nov 2010 12:39:46 +0100
Subject: save metadata to extended file attributes

It is often convinient to track back the source of a once downloaded
file; this patch makes curl store the source URL and other metadata
alongside the retrieved file by using the extended attributes (if
supported by the file system and enabled by --xattr).
---
 src/main.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'src/main.c')

diff --git a/src/main.c b/src/main.c
index 8a942de07..5394bac2a 100644
--- a/src/main.c
+++ b/src/main.c
@@ -51,6 +51,8 @@
 #endif
 #include "rawstr.h"
 
+#include "xattr.h"
+
 #define CURLseparator   "--_curl_--"
 
 #ifdef NETWARE
@@ -621,6 +623,7 @@ struct Configurable {
   int default_node_flags; /* default flags to seach for each 'node', which is
                              basically each given URL to transfer */
   struct OutStruct *outs;
+  bool xattr; /* store metadata in extended attributes */
 };
 
 #define WARN_PREFIX "Warning: "
@@ -906,6 +909,7 @@ static void help(void)
     "    --wdebug        Turn on Watt-32 debugging",
 #endif
     " -w/--write-out <format> What to output after completion",
+    " --xattr            Store metadata in extended file attributes",
     " -q                 If used as the first parameter disables .curlrc",
     NULL
   };
@@ -1953,6 +1957,7 @@ static ParameterError getparameter(char *flag, /* f or -long-flag */
     {"y", "speed-time", TRUE},
     {"z", "time-cond",   TRUE},
     {"#", "progress-bar",FALSE},
+    {"~", "xattr",FALSE},
   };
 
   if(('-' != flag[0]) ||
@@ -2445,6 +2450,9 @@ static ParameterError getparameter(char *flag, /* f or -long-flag */
       else
         config->progressmode = CURL_PROGRESS_STATS;
       break;
+    case '~': /* --xattr */
+      config->xattr = toggle;
+      break;
     case '0':
       /* HTTP version 1.0 */
       config->httpversion = CURL_HTTP_VERSION_1_0;
@@ -5639,6 +5647,15 @@ 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) );
+          }
+        }
+
 #ifdef HAVE_UTIME
         /* Important that we set the time _after_ the file has been
            closed, as is done above here */
-- 
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