From a30920d88f29a1eb37c41b93a244be16200991da Mon Sep 17 00:00:00 2001
From: Thomas Leonard <talex5@gmail.com>
Date: Sat, 8 Jan 2011 19:23:05 +0000
Subject: [PATCH] Added '0install update' sub-command

---
 0install.1                |  2 +-
 zeroinstall/cmd/update.py | 73 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 74 insertions(+), 1 deletion(-)
 create mode 100644 zeroinstall/cmd/update.py

diff --git a/0install.1 b/0install.1
index 6166069..8801312 100644
--- a/0install.1
+++ b/0install.1
@@ -238,7 +238,7 @@ Check for updates to the program and download them if found. This is similar to
 whether any changes were found.
 
 .PP
-The options are the same as for `download'.
+The options are the same as for `select'.
 
 .SS 0install import FEED
 
diff --git a/zeroinstall/cmd/update.py b/zeroinstall/cmd/update.py
new file mode 100644
index 0000000..a5181c6
--- /dev/null
+++ b/zeroinstall/cmd/update.py
@@ -0,0 +1,73 @@
+"""
+The B{0install download} command-line interface.
+"""
+
+# Copyright (C) 2011, Thomas Leonard
+# See the README file for details, or visit http://0install.net.
+
+from optparse import OptionParser
+import os, sys
+import logging
+
+from zeroinstall import cmd, SafeException, _
+from zeroinstall.injector import model
+from zeroinstall.cmd import UsageError, select
+
+syntax = "URI"
+
+add_options = select.add_generic_select_options
+
+def handle(options, args):
+	if len(args) != 1:
+		raise UsageError()
+
+	assert not options.offline
+
+	iface_uri = model.canonical_iface_uri(args[0])
+
+	old_gui = options.gui
+
+	# Select once in offline console mode to get the old values
+	options.offline = True
+	options.gui = False
+	options.refresh = False
+
+	try:
+		old_sels = select.get_selections(options, iface_uri,
+					select_only = True, download_only = False, test_callback = None)
+	except SafeException, ex:
+		old_selections = {}
+	else:
+		if old_sels is None:
+			old_selections = {}
+		else:
+			old_selections = old_sels.selections
+
+	# Download in online mode to get the new values
+	options.offline = False
+	options.gui = old_gui
+	options.refresh = True
+
+	sels = select.get_selections(options, iface_uri,
+				select_only = False, download_only = True, test_callback = None)
+	if not sels:
+		sys.exit(1)	# Aborted by user
+
+	changes = False
+
+	for iface, old_sel in old_selections.iteritems():
+		new_sel = sels.selections.get(iface, None)
+		if new_sel is None:
+			print _("No longer used: %s") % iface
+			changes = True
+		elif old_sel.version != new_sel.version:
+			print _("%s: %s -> %s") % (iface, old_sel.version, new_sel.version)
+			changes = True
+
+	for iface, new_sel in sels.selections.iteritems():
+		if iface not in old_selections:
+			print _("%s: new -> %s") % (iface, new_sel.version)
+			changes = True
+
+	if not changes:
+		print _("No updates found.")
-- 
2.11.4.GIT