Enable 'waf update' when use_config is provided - Issue 1541

ChangeLog

@@ -1,3 +1,10 @@
+NEW IN WAF 1.8.13
+-----------------
+* Exposed the Popen parameters input/timeout to cmd_and_log/exec_command (timeout is for Python >= 3.3)
+* Added an option to skip searching the regular sys.path when loading waf tools
+* Changed gccdeps so that it handle .. within paths
+* env = conf.env.derive().detach()
+
 NEW IN WAF 1.8.12
 -----------------
 * Fixed a regression when building in sub-folders - https://github.com/waf-project/waf/issues/1590

waflib/Scripting.py

@@ -564,15 +564,26 @@ def distcheck(ctx):
 	pass
 
 def update(ctx):
-	lst = Options.options.files.split(',')
-	if not lst:
-		lst = [x for x in Utils.listdir(Context.waf_dir + '/waflib/extras') if x.endswith('.py')]
+	lst = Options.options.files
+	if lst:
+		lst = lst.split(',')
+	else:
+		path = os.path.join(Context.waf_dir, 'waflib', 'extras')
+		lst = [x for x in Utils.listdir(path) if x.endswith('.py')]
 	for x in lst:
 		tool = x.replace('.py', '')
+		if not tool:
+			continue
 		try:
-			Configure.download_tool(tool, force=True, ctx=ctx)
+			dl = Configure.download_tool
+		except AttributeError:
+			ctx.fatal('The command "update" is dangerous; include the tool "use_config" in your project!')
+		try:
+			dl(tool, force=True, ctx=ctx)
 		except Errors.WafError:
-			Logs.error('Could not find the tool %s in the remote repository' % x)
+			Logs.error('Could not find the tool %r in the remote repository' % x)
+		else:
+			Logs.warn('Updated %r' % tool)
 
 def autoconfigure(execute_method):
 	"""

waflib/extras/use_config.py

@@ -58,7 +58,7 @@ else:
 	urlopen = request.urlopen
 
 
-from waflib import Errors, Context, Logs, Utils, Options
+from waflib import Errors, Context, Logs, Utils, Options, Configure
 
 try:
 	from urllib.parse import urlparse
@@ -144,7 +144,7 @@ def load_tool(tool, tooldir=None, ctx=None, with_sys_path=True):
 
 Context.load_tool_default = Context.load_tool
 Context.load_tool = load_tool
-
+Configure.download_tool = download_tool
 
 def configure(self):
 	opts = self.options