dirstate: filecacheify _ignore (issue3278)

This still doesn't handle the case where a command is run with
--config ui.ignore=path since we only look for changes in .hgignore.

mercurial/dirstate.py

@@ -21,6 +21,11 b' class repocache(filecache):'
     def join(self, obj, fname):
         return obj._opener.join(fname)
 
+class rootcache(filecache):
+    """filecache for files in the repository root"""
+    def join(self, obj, fname):
+        return obj._join(fname)
+
 def _finddirs(path):
     pos = path.rfind('/')
     while pos != -1:
@@ -120,7 +125,7 b' class dirstate(object):'
     def dirs(self):
         return self._dirs
 
-    @propertycache
+    @rootcache('.hgignore')
     def _ignore(self):
         files = [self._join('.hgignore')]
         for name, path in self._ui.configitems("ui"):

tests/test-commandserver.py

@@ -219,6 +219,20 b' def branch(server):'
     runcommand(server, ['branch'])
     os.system('hg branch default')
 
+def hgignore(server):
+    readchannel(server)
+    f = open('.hgignore', 'ab')
+    f.write('')
+    f.close()
+    runcommand(server, ['commit', '-Am.'])
+    f = open('ignored-file', 'ab')
+    f.write('')
+    f.close()
+    f = open('.hgignore', 'ab')
+    f.write('ignored-file')
+    f.close()
+    runcommand(server, ['status', '-i', '-u'])
+
 if __name__ == '__main__':
     os.system('hg init')
 
@@ -240,3 +254,4 b" if __name__ == '__main__':"
     check(setphase)
     check(rollback)
     check(branch)
+    check(hgignore)

tests/test-commandserver.py.out

@@ -156,3 +156,10 b' marked working directory as branch foo'
 foo
 marked working directory as branch default
 (branches are permanent and global, did you want a bookmark?)
+
+testing hgignore:
+
+ runcommand commit -Am.
+adding .hgignore
+ runcommand status -i -u
+I ignored-file