X-Git-Url: https://git.dogcows.com/gitweb?a=blobdiff_plain;f=src%2Fcreate.c;h=4cd5980856b580620f0d039d84f6deadb94ee596;hb=ab3b31cfef3e33696596f459da5130256b5ec60f;hp=b7b41c425086c38eb39cb289a3db06d0ec29f6a0;hpb=c50565d9655329deb983c3df5b151d1fe2032953;p=chaz%2Ftar

diff --git a/src/create.c b/src/create.c
index b7b41c4..4cd5980 100644
--- a/src/create.c
+++ b/src/create.c
@@ -19,7 +19,7 @@
    with this program; if not, write to the Free Software Foundation, Inc.,
    59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
 
-#include "system.h"
+#include <system.h>
 
 #if HAVE_UTIME_H
 # include <utime.h>
@@ -922,6 +922,47 @@ dump_regular_finish (int fd, struct tar_stat_info *st, time_t original_ctime)
     }
 }
 
+/* Look in directory DIRNAME for a cache directory tag file
+   with the magic name "CACHEDIR.TAG" and a standard header,
+   as described at:
+	http://www.brynosaurus.com/cachedir
+   Applications can write this file into directories they create
+   for use as caches containing purely regenerable, non-precious data,
+   allowing us to avoid archiving them if --exclude-caches is specified. */
+
+#define CACHEDIR_SIGNATURE "Signature: 8a477f597d28d172789f06886806bc55"
+#define CACHEDIR_SIGNATURE_SIZE (sizeof CACHEDIR_SIGNATURE - 1)
+
+static bool
+check_cache_directory (char *dirname)
+{
+  static char tagname[] = "CACHEDIR.TAG";
+  char *tagpath;
+  int fd;
+  int tag_present = false;
+
+  tagpath = xmalloc (strlen (dirname) + strlen (tagname) + 1);
+  strcpy (tagpath, dirname);
+  strcat (tagpath, tagname);
+
+  fd = open (tagpath, O_RDONLY);
+  if (fd >= 0)
+    {
+      static char tagbuf[CACHEDIR_SIGNATURE_SIZE];
+      
+      if (read (fd, tagbuf, CACHEDIR_SIGNATURE_SIZE)
+	  == CACHEDIR_SIGNATURE_SIZE
+	  && memcmp (tagbuf, CACHEDIR_SIGNATURE, CACHEDIR_SIGNATURE_SIZE) == 0)
+	tag_present = true;
+
+      close (fd);
+    }
+
+  free (tagpath);
+
+  return tag_present;
+}
+
 static void
 dump_dir0 (char *directory,
 	   struct tar_stat_info *st, int top_level, dev_t parent_device)
@@ -1012,6 +1053,16 @@ dump_dir0 (char *directory,
       return;
     }
 
+  if (exclude_caches_option
+      && check_cache_directory(st->orig_file_name))
+    {
+      if (verbose_option)
+	WARN ((0, 0,
+	       _("%s: contains a cache directory tag; not dumped"),
+	       quotearg_colon (st->orig_file_name)));
+      return;
+    }
+
   {
     char const *entry;
     size_t entry_len;
@@ -1322,16 +1373,19 @@ dump_file0 (struct tar_stat_info *st, char *p,
 #endif
 
   /* See if we want only new files, and check if this one is too old to
-     put in the archive.  */
+     put in the archive.
 
-  if (!S_ISDIR (st->stat.st_mode)
+     This check is omitted if incremental_option is set *and* the
+     requested file is not explicitely listed in the command line. */
+
+  if (!(incremental_option && !is_individual_file (p))
+      && !S_ISDIR (st->stat.st_mode)
       && OLDER_STAT_TIME (st->stat, m)
       && (!after_date_option || OLDER_STAT_TIME (st->stat, c)))
     {
-      if (0 < top_level) /* equivalent to !incremental_option */
+      if (!incremental_option)
 	WARN ((0, 0, _("%s: file is unchanged; not dumped"),
 	       quotearg_colon (p)));
-      /* FIXME: recheck this return.  */
       return;
     }