codereview: extra repo sanity check

Also work around Mercurial issue 3023.

If anyone has local changes in their repo (due to
patch queues or whatever) stop them from leaking
into the main repository.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5144043

lib/codereview/codereview.py

@@ -38,7 +38,7 @@ For example, if change 123456 contains the files x.go and y.go,
 "hg diff @123456" is equivalent to"hg diff x.go y.go".
 '''
 
-from mercurial import cmdutil, commands, hg, util, error, match
+from mercurial import cmdutil, commands, hg, util, error, match, discovery
 from mercurial.node import nullrev, hex, nullid, short
 import os, re, time
 import stat
@@ -71,9 +71,12 @@ except:
 
 try:
 	from mercurial.discovery import findcommonincoming
+	from mercurial.discovery import findoutgoing
 except:
 	def findcommonincoming(repo, remote):
 		return repo.findcommonincoming(remote)
+	def findoutgoing(repo, remote):
+		return repo.findoutgoing(remote)
 
 # in Mercurial 1.9 the cmdutil.match and cmdutil.revpair moved to scmutil
 if hgversion >= '1.9':
@@ -1738,6 +1741,11 @@ def submit(ui, repo, *pats, **opts):
 		return "dry run; not submitted"
 
 	set_status("pushing " + cl.name + " to remote server")
+
+	other = getremote(ui, repo, opts)
+	if findoutgoing(repo, other):
+		raise util.Abort("local repository corrupt or out-of-phase with remote: found outgoing changes")
+
 	m = match.exact(repo.root, repo.getcwd(), cl.files)
 	node = repo.commit(ustr(opts['message']), ustr(userline), opts.get('date'), m)
 	if not node:
@@ -1758,7 +1766,6 @@ def submit(ui, repo, *pats, **opts):
 		# push changes to remote.
 		# if it works, we're committed.
 		# if not, roll back
-		other = getremote(ui, repo, opts)
 		r = repo.push(other, False, None)
 		if r == 0:
 			raise util.Abort("local repository out of date; must sync before submit")
@@ -3130,6 +3137,7 @@ class MercurialVCS(VersionControlSystem):
 		super(MercurialVCS, self).__init__(options)
 		self.ui = ui
 		self.repo = repo
+		self.status = None
 		# Absolute path to repository (we can be in a subdir)
 		self.repo_dir = os.path.normpath(repo.root)
 		# Compute the subdir
@@ -3188,6 +3196,33 @@ class MercurialVCS(VersionControlSystem):
 				unknown_files.append(fn)
 		return unknown_files
 
+	def get_hg_status(self, rev, path):
+		# We'd like to use 'hg status -C path', but that is buggy
+		# (see http://mercurial.selenic.com/bts/issue3023).
+		# Instead, run 'hg status -C' without a path
+		# and skim the output for the path we want.
+		if self.status is None:
+			if use_hg_shell:
+				out = RunShell(["hg", "status", "-C", "--rev", rev])
+			else:
+				fui = FakeMercurialUI()
+				ret = commands.status(fui, self.repo, *[], **{'rev': [rev], 'copies': True})
+				if ret:
+					raise util.Abort(ret)
+				out = fui.output
+			self.status = out.splitlines()
+		for i in range(len(self.status)):
+			# line is
+			#	A path
+			#	M path
+			# etc
+			line = self.status[i]
+			if line[2:] == path:
+				if i+1 < len(self.status) and self.status[i+1][:2] == '  ':
+					return self.status[i:i+2]
+				return self.status[i:i+1]
+		raise util.Abort("no status for " + path)
+	
 	def GetBaseFile(self, filename):
 		set_status("inspecting " + filename)
 		# "hg status" and "hg cat" both take a path relative to the current subdir
@@ -3197,20 +3232,7 @@ class MercurialVCS(VersionControlSystem):
 		new_content = None
 		is_binary = False
 		oldrelpath = relpath = self._GetRelPath(filename)
-		# "hg status -C" returns two lines for moved/copied files, one otherwise
-		if use_hg_shell:
-			out = RunShell(["hg", "status", "-C", "--rev", self.base_rev, relpath])
-		else:
-			fui = FakeMercurialUI()
-			ret = commands.status(fui, self.repo, *[relpath], **{'rev': [self.base_rev], 'copies': True})
-			if ret:
-				raise util.Abort(ret)
-			out = fui.output
-		out = out.splitlines()
-		# HACK: strip error message about missing file/directory if it isn't in
-		# the working copy
-		if out[0].startswith('%s: ' % relpath):
-			out = out[1:]
+		out = self.get_hg_status(self.base_rev, relpath)
 		status, what = out[0].split(' ', 1)
 		if len(out) > 1 and status == "A" and what == relpath:
 			oldrelpath = out[1].strip()