git: restore basic functionality (issue6545) stable

git: restore basic functionality (issue6545)

It looks like a big refactor happened on dirstate, and the git extension was
just ignored.

Differential Revision: https://phab.mercurial-scm.org/D11234

--- a/hgext/git/dirstate.py	Thu Jul 29 17:03:35 2021 -0400
+++ b/hgext/git/dirstate.py	Thu Jul 29 17:04:55 2021 -0400
@@ -74,6 +74,8 @@
         self._root = os.path.dirname(root)
         self.git = gitrepo
         self._plchangecallbacks = {}
+        # TODO: context.poststatusfixup is bad and uses this attribute
+        self._dirty = False
 
     def p1(self):
         try:
@@ -255,12 +257,12 @@
             if match(p):
                 yield p
 
-    def normal(self, f, parentfiledata=None):
+    def set_clean(self, f, parentfiledata=None):
         """Mark a file normal and clean."""
         # TODO: for now we just let libgit2 re-stat the file. We can
         # clearly do better.
 
-    def normallookup(self, f):
+    def set_possibly_dirty(self, f):
         """Mark a file normal, but possibly dirty."""
         # TODO: for now we just let libgit2 re-stat the file. We can
         # clearly do better.
@@ -296,6 +298,16 @@
         # TODO: figure out a strategy for saving index backups.
         pass
 
+    def set_tracked(self, f):
+        uf = pycompat.fsdecode(f)
+        if uf in self.git.index:
+            return False
+        index = self.git.index
+        index.read()
+        index.add(uf)
+        index.write()
+        return True
+
     def add(self, f):
         index = self.git.index
         index.read()
@@ -310,6 +322,16 @@
             index.remove(fs)
             index.write()
 
+    def set_untracked(self, f):
+        index = self.git.index
+        index.read()
+        fs = pycompat.fsdecode(f)
+        if fs in index:
+            index.remove(fs)
+            index.write()
+            return True
+        return False
+
     def remove(self, f):
         index = self.git.index
         index.read()
@@ -324,6 +346,10 @@
         # TODO
         pass
 
+    def update_file(self, *args, **kwargs):
+        # TODO
+        pass
+
     @contextlib.contextmanager
     def parentchange(self):
         # TODO: track this maybe?