New --exclude-if-present option (i.e. --exclude-if-present .nobackup).

(Jeff Strunk).


git-svn-id: http://svn.savannah.nongnu.org/svn/rdiff-backup@797 2b77aa54-bcbc-44c9-a7ec-4f6cf2b41109

trunk/rdiff-backup/CHANGELOG

 New in v1.1.10 (????/??/??)
 ---------------------------
 
+New --exclude-if-present option (i.e. --exclude-if-present .nobackup).
+(Jeff Strunk).
+
 Use signal 0 rather than signal.NSIG when testing if another rdiff-backup
 is still running.  (Patch from Sébastien Maret)
 

trunk/rdiff-backup/rdiff-backup.1

@@ -190,6 +190,12 @@ Exclude all socket files.
 .B "\-\-exclude-symbolic-links"
 Exclude all symbolic links.
 .TP
+.BI "\-\exclude-if-present " filename
+Exclude directories if
+.IR filename
+is present. This option needs to come before any other include or
+exclude options.
+.TP
 .B \-\-force
 Authorize a more drastic modification of a directory than usual (for
 instance, when overwriting of a destination path, or when removing

trunk/rdiff-backup/rdiff_backup/Main.py

@@ -67,7 +67,7 @@ def parse_cmdlineoptions(arglist):
 		  "exclude-symbolic-links", "exclude-sockets",
 		  "exclude-filelist-stdin", "exclude-globbing-filelist=",
 		  "exclude-globbing-filelist-stdin", "exclude-mirror=",
-		  "exclude-other-filesystems", "exclude-regexp=",
+		  "exclude-other-filesystems", "exclude-regexp=", "exclude-if-present=",
 		  "exclude-special-files", "force", "group-mapping-file=",
 		  "include=", "include-filelist=", "include-filelist-stdin",
 		  "include-globbing-filelist=",
@@ -109,6 +109,7 @@ def parse_cmdlineoptions(arglist):
 			  opt == "--exclude-fifos" or
 			  opt == "--exclude-other-filesystems" or
 			  opt == "--exclude-regexp" or
+			  opt == "--exclude-if-present" or
 			  opt == "--exclude-special-files" or
 			  opt == "--exclude-sockets" or
 			  opt == "--exclude-symbolic-links"):

trunk/rdiff-backup/rdiff_backup/selection.py

@@ -234,6 +234,8 @@ class Select:
 			for opt, arg in argtuples:
 				if opt == "--exclude":
 					self.add_selection_func(self.glob_get_sf(arg, 0))
+				elif opt == "--exclude-if-present":
+					self.add_selection_func(self.presence_get_sf(arg, 0))
 				elif opt == "--exclude-device-files":
 					self.add_selection_func(self.devfiles_get_sf(0))
 				elif opt == "--exclude-symbolic-links":
@@ -471,6 +473,18 @@ probably isn't what you meant.""" %
 		sel_func.name = "Regular expression: %s" % regexp_string
 		return sel_func
 
+	def presence_get_sf(self, presence_filename, include):
+		"""Return selection function given by a file if present"""
+		assert include == 0 or include == 1
+
+		def sel_func(rp):
+			if rp.isdir() and rp.readable() and rp.append(presence_filename).isreg(): return include
+			return None
+
+		sel_func.exclude = not include
+		sel_func.name = "Presence file: %s" % presence_filename
+		return sel_func
+
 	def gen_get_sf(self, pred, include, name):
 		"""Returns a selection function that uses pred to test