Removed ORIG_HEAD handling which was downright wrong. ORIG_HEAD gets only set during merge and rebase, and probably everything that changes the ref more drastically. Probably I have to reread that. What needs to be adjusted though is the reflog

Author: Byron

refs/head.py

@@ -29,23 +29,6 @@ def orig_head(self):
 			to contain the previous value of HEAD"""
 		return SymbolicReference(self.repo, self._ORIG_HEAD_NAME)
 
-	def _set_reference(self, ref):
-		"""If someone changes the reference through us, we must manually update 
-		the ORIG_HEAD if we are detached. The underlying implementation can only
-		handle un-detached heads as it has to check whether the current head 
-		is the checked-out one"""
-		if self.is_detached:
-			prev_commit = self.commit
-			super(HEAD, self)._set_reference(ref)
-			SymbolicReference.create(self.repo, self._ORIG_HEAD_NAME, prev_commit, force=True)
-		else:
-			super(HEAD, self)._set_reference(ref)
-		# END handle detached mode
-		
-	# aliased reference
-	reference = property(SymbolicReference._get_reference, _set_reference, doc="Returns the Reference we point to")
-	ref = reference
-	
 	def reset(self, commit='HEAD', index=True, working_tree = False, 
 				paths=None, **kwargs):
 		"""Reset our HEAD to the given commit optionally synchronizing 

refs/log.py

@@ -1,6 +1,7 @@
 from git.util import (
 						join_path,
 						Actor,
+						LockedFD,
 					)
 
 from gitdb.util import (
@@ -173,13 +174,16 @@ def iter_entries(cls, stream):
 	def to_file(self, filepath):
 		"""Write the contents of the reflog instance to a file at the given filepath.
 		:param filepath: path to file, parent directories are assumed to exist"""
-		# TODO: Use locked fd
-		fp = open(filepath, 'wb')
+		lfd = LockedFD(filepath)
+		fp = lfd.open(write=True, stream=True)
 		try:
 			self._serialize(fp)
-		finally:
-			fp.close()
-		#END handle file streams
+			lfd.commit()
+		except:
+			# on failure it rolls back automatically, but we make it clear
+			lfd.rollback()
+			raise
+		#END handle change
 
 	def append_entry(self, oldbinsha, newbinsha, message, write=True):
 		"""Append a new log entry to the revlog, changing it in place.

refs/symbolic.py

@@ -13,7 +13,8 @@
 							exists,
 							isfile,
 							rename,
-							hex_to_bin
+							hex_to_bin,
+							LockedFD
 						)
 
 from log import RefLog
@@ -181,11 +182,13 @@ def _get_reference(self):
 			raise TypeError("%s is a detached symbolic reference as it points to %r" % (self, sha))
 		return self.from_path(self.repo, target_ref_path)
 
-	def _set_reference(self, ref):
+	def _set_reference(self, ref, msg = None):
 		"""Set ourselves to the given ref. It will stay a symbol if the ref is a Reference.
 		Otherwise we try to get a commit from it using our interface.
 		
-		Strings are allowed but will be checked to be sure we have a commit"""
+		Strings are allowed but will be checked to be sure we have a commit
+		:param msg: If set to a string, the message will be used in the reflog.
+			Otherwise, a reflog entry is not written for the changed reference"""
 		write_value = None
 		if isinstance(ref, SymbolicReference):
 			write_value = "ref: %s" % ref.path
@@ -205,22 +208,6 @@ def _set_reference(self, ref):
 			# END end try string  
 		# END try commit attribute
 
-		# maintain the orig-head if we are currently checked-out
-		head = HEAD(self.repo)
-		try:
-			if head.ref == self:
-				try:
-					# TODO: implement this atomically, if we fail below, orig_head is at an incorrect spot
-					# Enforce the creation of ORIG_HEAD
-					SymbolicReference.create(self.repo, head.orig_head().name, self.commit, force=True)
-				except ValueError:
-					pass
-				#END exception handling
-			# END if we are checked-out
-		except TypeError:
-			pass
-		# END handle detached heads
-		
 		# if we are writing a ref, use symbolic ref to get the reflog and more
 		# checking
 		# Otherwise we detach it and have to do it manually. Besides, this works

test/test_index.py

@@ -422,7 +422,6 @@ def mixed_iterator():
 		# same index, no parents
 		commit_message = "index without parents"
 		commit_no_parents = index.commit(commit_message, parent_commits=list(), head=True)
-		assert SymbolicReference(rw_repo, 'ORIG_HEAD').commit == cur_commit
 		assert commit_no_parents.message == commit_message
 		assert len(commit_no_parents.parents) == 0
 		assert cur_head.commit == commit_no_parents

test/test_refs.py

@@ -95,35 +95,38 @@ def test_heads(self, rwrepo):
 			assert head.tracking_branch() is None
 		# END for each head
 
-		# verify ORIG_HEAD gets set for detached heads
-		head = rwrepo.head
-		orig_head = head.orig_head()
-		cur_head = head.ref
-		cur_commit = cur_head.commit
-		pcommit = cur_head.commit.parents[0].parents[0]
-		head.ref = pcommit				# detach head
-		assert orig_head.commit == cur_commit
-		
-		# even if we set it through its reference - chaning the ref
-		# will adjust the orig_head, which still points to cur_commit
-		head.ref = cur_head
-		assert orig_head.commit == pcommit
-		assert head.commit == cur_commit == cur_head.commit
-		
-		cur_head.commit = pcommit
-		assert head.commit == pcommit
-		assert orig_head.commit == cur_commit
-		
-		# with automatic dereferencing
-		head.commit = cur_commit
-		assert orig_head.commit == pcommit
-		
-		# changing branches which are not checked out doesn't affect the ORIG_HEAD
-		other_head = Head.create(rwrepo, 'mynewhead', pcommit)
-		assert other_head.commit == pcommit
-		assert orig_head.commit == pcommit
-		other_head.commit = pcommit.parents[0]
-		assert orig_head.commit == pcommit
+		# verify REFLOG gets altered
+		if False:
+			head = rwrepo.head
+			orig_head = head.orig_head()
+			cur_head = head.ref
+			cur_commit = cur_head.commit
+			pcommit = cur_head.commit.parents[0].parents[0]
+			head.ref = pcommit				# detach head
+			assert orig_head.commit == cur_commit
+			
+			# even if we set it through its reference - chaning the ref
+			# will adjust the orig_head, which still points to cur_commit
+			head.ref = cur_head
+			assert orig_head.commit == pcommit
+			assert head.commit == cur_commit == cur_head.commit
+			
+			cur_head.commit = pcommit
+			assert head.commit == pcommit
+			assert orig_head.commit == cur_commit
+			
+			# with automatic dereferencing
+			head.commit = cur_commit
+			assert orig_head.commit == pcommit
+			
+			# changing branches which are not checked out doesn't affect the ORIG_HEAD
+			other_head = Head.create(rwrepo, 'mynewhead', pcommit)
+			assert other_head.commit == pcommit
+			assert orig_head.commit == pcommit
+			other_head.commit = pcommit.parents[0]
+			assert orig_head.commit == pcommit
+		
+		# TODO: Need changing a ref changes HEAD reflog as well if it pointed to it
 
 
 	def test_refs(self):