X-Git-Url: https://git.notmuchmail.org/git?p=notmuch;a=blobdiff_plain;f=notmuch-new.c;h=6a8b1b22bf067305f7c05c2eac4f1a232424db38;hp=faa33f1fc505f13f06bfe0a0d69b711136ac8597;hb=c7453773064efbd0b2cd17b15ba483edbd28ce1e;hpb=4ef2106792439f5ade157b3ba3b8f7fa86fcb3ed

diff --git a/notmuch-new.c b/notmuch-new.c
index faa33f1f..6a8b1b22 100644
--- a/notmuch-new.c
+++ b/notmuch-new.c
@@ -323,6 +323,35 @@ add_files (notmuch_database_t *notmuch,
     }
     db_mtime = directory ? notmuch_directory_get_mtime (directory) : 0;
 
+    /* If the directory is unchanged from our last scan and has no
+     * sub-directories, then return without scanning it at all.  In
+     * some situations, skipping the scan can substantially reduce the
+     * cost of notmuch new, especially since the huge numbers of files
+     * in Maildirs make scans expensive, but all files live in leaf
+     * directories.
+     *
+     * To check for sub-directories, we borrow a trick from find,
+     * kpathsea, and many other UNIX tools: since a directory's link
+     * count is the number of sub-directories (specifically, their
+     * '..' entries) plus 2 (the link from the parent and the link for
+     * '.').  This check is safe even on weird file systems, since
+     * file systems that can't compute this will return 0 or 1.  This
+     * is safe even on *really* weird file systems like HFS+ that
+     * mistakenly return the total number of directory entries, since
+     * that only inflates the count beyond 2.
+     */
+    if (directory && fs_mtime == db_mtime && st.st_nlink == 2) {
+	/* There's one catch: pass 1 below considers symlinks to
+	 * directories to be directories, but these don't increase the
+	 * file system link count.  So, only bail early if the
+	 * database agrees that there are no sub-directories. */
+	db_subdirs = notmuch_directory_get_child_directories (directory);
+	if (!notmuch_filenames_valid (db_subdirs))
+	    goto DONE;
+	notmuch_filenames_destroy (db_subdirs);
+	db_subdirs = NULL;
+    }
+
     /* If the database knows about this directory, then we sort based
      * on strcmp to match the database sorting. Otherwise, we can do
      * inode-based sorting for faster filesystem operation. */
@@ -869,10 +898,8 @@ notmuch_new_command (notmuch_config_t *config, int argc, char *argv[])
     };
 
     opt_index = parse_arguments (argc, argv, options, 1);
-    if (opt_index < 0) {
-	/* diagnostics already printed */
-	return 1;
-    }
+    if (opt_index < 0)
+	return EXIT_FAILURE;
 
     add_files_state.new_tags = notmuch_config_get_new_tags (config, &add_files_state.new_tags_length);
     add_files_state.new_ignore = notmuch_config_get_new_ignore (config, &add_files_state.new_ignore_length);
@@ -882,7 +909,7 @@ notmuch_new_command (notmuch_config_t *config, int argc, char *argv[])
     if (!no_hooks) {
 	ret = notmuch_run_hook (db_path, "pre-new");
 	if (ret)
-	    return ret;
+	    return EXIT_FAILURE;
     }
 
     dot_notmuch_path = talloc_asprintf (config, "%s/%s", db_path, ".notmuch");
@@ -893,16 +920,16 @@ notmuch_new_command (notmuch_config_t *config, int argc, char *argv[])
 	count = 0;
 	count_files (db_path, &count, &add_files_state);
 	if (interrupted)
-	    return 1;
+	    return EXIT_FAILURE;
 
 	printf ("Found %d total files (that's not much mail).\n", count);
 	if (notmuch_database_create (db_path, &notmuch))
-	    return 1;
+	    return EXIT_FAILURE;
 	add_files_state.total_files = count;
     } else {
 	if (notmuch_database_open (db_path, NOTMUCH_DATABASE_MODE_READ_WRITE,
 				   &notmuch))
-	    return 1;
+	    return EXIT_FAILURE;
 
 	if (notmuch_database_needs_upgrade (notmuch)) {
 	    printf ("Welcome to a new version of notmuch! Your database will now be upgraded.\n");
@@ -917,7 +944,7 @@ notmuch_new_command (notmuch_config_t *config, int argc, char *argv[])
     }
 
     if (notmuch == NULL)
-	return 1;
+	return EXIT_FAILURE;
 
     /* Setup our handler for SIGINT. We do this after having
      * potentially done a database upgrade we this interrupt handler
@@ -1043,5 +1070,5 @@ notmuch_new_command (notmuch_config_t *config, int argc, char *argv[])
     if (!no_hooks && !ret && !interrupted)
 	ret = notmuch_run_hook (db_path, "post-new");
 
-    return ret || interrupted;
+    return ret || interrupted ? EXIT_FAILURE : EXIT_SUCCESS;
 }