def test_head_reset(self, rw_repo):
cur_head = rw_repo.head
old_head_commit = cur_head.commit
new_head_commit = cur_head.ref.commit.parents[0]
cur_head.reset(new_head_commit, index=True) # index only
assert cur_head.reference.commit == new_head_commit
self.failUnlessRaises(ValueError, cur_head.reset, new_head_commit, index=False, working_tree=True)
new_head_commit = new_head_commit.parents[0]
cur_head.reset(new_head_commit, index=True, working_tree=True) # index + wt
assert cur_head.reference.commit == new_head_commit
# paths - make sure we have something to do
rw_repo.index.reset(old_head_commit.parents[0])
cur_head.reset(cur_head, paths="test")
cur_head.reset(new_head_commit, paths="lib")
# hard resets with paths don't work, its all or nothing
self.failUnlessRaises(GitCommandError, cur_head.reset, new_head_commit, working_tree=True, paths="lib")
# we can do a mixed reset, and then checkout from the index though
cur_head.reset(new_head_commit)
rw_repo.index.checkout(["lib"], force=True)
# now that we have a write write repo, change the HEAD reference - its
# like git-reset --soft
heads = rw_repo.heads
assert heads
for head in heads:
cur_head.reference = head
assert cur_head.reference == head
assert isinstance(cur_head.reference, Head)
assert cur_head.commit == head.commit
assert not cur_head.is_detached
# END for each head
# detach
active_head = heads[0]
curhead_commit = active_head.commit
cur_head.reference = curhead_commit
assert cur_head.commit == curhead_commit
assert cur_head.is_detached
self.failUnlessRaises(TypeError, getattr, cur_head, "reference")
# tags are references, hence we can point to them
some_tag = rw_repo.tags[0]
cur_head.reference = some_tag
assert not cur_head.is_detached
assert cur_head.commit == some_tag.commit
assert isinstance(cur_head.reference, TagReference)
# put HEAD back to a real head, otherwise everything else fails
cur_head.reference = active_head
# type check
self.failUnlessRaises(ValueError, setattr, cur_head, "reference", "that")
# head handling
commit = 'HEAD'
prev_head_commit = cur_head.commit
for count, new_name in enumerate(("my_new_head", "feature/feature1")):
actual_commit = commit + "^" * count
new_head = Head.create(rw_repo, new_name, actual_commit)
assert new_head.is_detached
assert cur_head.commit == prev_head_commit
assert isinstance(new_head, Head)
# already exists, but has the same value, so its fine
Head.create(rw_repo, new_name, new_head.commit)
# its not fine with a different value
self.failUnlessRaises(OSError, Head.create, rw_repo, new_name, new_head.commit.parents[0])
# force it
new_head = Head.create(rw_repo, new_name, actual_commit, force=True)
old_path = new_head.path
old_name = new_head.name
assert new_head.rename("hello").name == "hello"
assert new_head.rename("hello/world").name == "hello/world"
assert new_head.rename(old_name).name == old_name and new_head.path == old_path
# rename with force
tmp_head = Head.create(rw_repo, "tmphead")
self.failUnlessRaises(GitCommandError, tmp_head.rename, new_head)
tmp_head.rename(new_head, force=True)
assert tmp_head == new_head and tmp_head.object == new_head.object
logfile = RefLog.path(tmp_head)
assert os.path.isfile(logfile)
Head.delete(rw_repo, tmp_head)
# deletion removes the log as well
assert not os.path.isfile(logfile)
heads = rw_repo.heads
assert tmp_head not in heads and new_head not in heads
# force on deletion testing would be missing here, code looks okay though ;)
# END for each new head name
self.failUnlessRaises(TypeError, RemoteReference.create, rw_repo, "some_name")
# tag ref
tag_name = "5.0.2"
TagReference.create(rw_repo, tag_name)
self.failUnlessRaises(GitCommandError, TagReference.create, rw_repo, tag_name)
light_tag = TagReference.create(rw_repo, tag_name, "HEAD~1", force=True)
assert isinstance(light_tag, TagReference)
assert light_tag.name == tag_name
assert light_tag.commit == cur_head.commit.parents[0]
assert light_tag.tag is None
# tag with tag object
other_tag_name = "releases/1.0.2RC"
msg = "my mighty tag\nsecond line"
obj_tag = TagReference.create(rw_repo, other_tag_name, message=msg)
assert isinstance(obj_tag, TagReference)
assert obj_tag.name == other_tag_name
assert obj_tag.commit == cur_head.commit
assert obj_tag.tag is not None
TagReference.delete(rw_repo, light_tag, obj_tag)
tags = rw_repo.tags
assert light_tag not in tags and obj_tag not in tags
# remote deletion
remote_refs_so_far = 0
remotes = rw_repo.remotes
assert remotes
for remote in remotes:
refs = remote.refs
# If a HEAD exists, it must be deleted first. Otherwise it might
# end up pointing to an invalid ref it the ref was deleted before.
remote_head_name = "HEAD"
if remote_head_name in refs:
RemoteReference.delete(rw_repo, refs[remote_head_name])
del(refs[remote_head_name])
# END handle HEAD deletion
RemoteReference.delete(rw_repo, *refs)
remote_refs_so_far += len(refs)
for ref in refs:
assert ref.remote_name == remote.name
# END for each ref to delete
assert remote_refs_so_far
for remote in remotes:
# remotes without references should produce an empty list
self.assertEqual(remote.refs, [])
# END for each remote
# change where the active head points to
if cur_head.is_detached:
cur_head.reference = rw_repo.heads[0]
head = cur_head.reference
old_commit = head.commit
head.commit = old_commit.parents[0]
assert head.commit == old_commit.parents[0]
assert head.commit == cur_head.commit
head.commit = old_commit
# setting a non-commit as commit fails, but succeeds as object
head_tree = head.commit.tree
self.failUnlessRaises(ValueError, setattr, head, 'commit', head_tree)
assert head.commit == old_commit # and the ref did not change
# we allow heds to point to any object
head.object = head_tree
assert head.object == head_tree
# cannot query tree as commit
self.failUnlessRaises(TypeError, getattr, head, 'commit')
# set the commit directly using the head. This would never detach the head
assert not cur_head.is_detached
head.object = old_commit
cur_head.reference = head.commit
assert cur_head.is_detached
parent_commit = head.commit.parents[0]
assert cur_head.is_detached
cur_head.commit = parent_commit
assert cur_head.is_detached and cur_head.commit == parent_commit
cur_head.reference = head
assert not cur_head.is_detached
cur_head.commit = parent_commit
assert not cur_head.is_detached
assert head.commit == parent_commit
# test checkout
active_branch = rw_repo.active_branch
for head in rw_repo.heads:
checked_out_head = head.checkout()
assert checked_out_head == head
# END for each head to checkout
# checkout with branch creation
new_head = active_branch.checkout(b="new_head")
assert active_branch != rw_repo.active_branch
assert new_head == rw_repo.active_branch
# checkout with force as we have a changed a file
# clear file
open(new_head.commit.tree.blobs[-1].abspath, 'w').close()
assert len(new_head.commit.diff(None))
# create a new branch that is likely to touch the file we changed
far_away_head = rw_repo.create_head("far_head", 'HEAD~100')
self.failUnlessRaises(GitCommandError, far_away_head.checkout)
assert active_branch == active_branch.checkout(force=True)
assert rw_repo.head.reference != far_away_head
# test reference creation
partial_ref = 'sub/ref'
full_ref = 'refs/%s' % partial_ref
ref = Reference.create(rw_repo, partial_ref)
assert ref.path == full_ref
assert ref.object == rw_repo.head.commit
self.failUnlessRaises(OSError, Reference.create, rw_repo, full_ref, 'HEAD~20')
# it works if it is at the same spot though and points to the same reference
assert Reference.create(rw_repo, full_ref, 'HEAD').path == full_ref
Reference.delete(rw_repo, full_ref)
# recreate the reference using a full_ref
ref = Reference.create(rw_repo, full_ref)
assert ref.path == full_ref
assert ref.object == rw_repo.head.commit
# recreate using force
ref = Reference.create(rw_repo, partial_ref, 'HEAD~1', force=True)
assert ref.path == full_ref
assert ref.object == rw_repo.head.commit.parents[0]
# rename it
orig_obj = ref.object
for name in ('refs/absname', 'rela_name', 'feature/rela_name'):
ref_new_name = ref.rename(name)
assert isinstance(ref_new_name, Reference)
assert name in ref_new_name.path
assert ref_new_name.object == orig_obj
assert ref_new_name == ref
# END for each name type
# References that don't exist trigger an error if we want to access them
self.failUnlessRaises(ValueError, getattr, Reference(rw_repo, "refs/doesntexist"), 'commit')
# exists, fail unless we force
ex_ref_path = far_away_head.path
self.failUnlessRaises(OSError, ref.rename, ex_ref_path)
# if it points to the same commit it works
far_away_head.commit = ref.commit
ref.rename(ex_ref_path)
assert ref.path == ex_ref_path and ref.object == orig_obj
assert ref.rename(ref.path).path == ex_ref_path # rename to same name
# create symbolic refs
symref_path = "symrefs/sym"
symref = SymbolicReference.create(rw_repo, symref_path, cur_head.reference)
assert symref.path == symref_path
assert symref.reference == cur_head.reference
self.failUnlessRaises(OSError, SymbolicReference.create, rw_repo, symref_path, cur_head.reference.commit)
# it works if the new ref points to the same reference
SymbolicReference.create(rw_repo, symref.path, symref.reference).path == symref.path # @NoEffect
SymbolicReference.delete(rw_repo, symref)
# would raise if the symref wouldn't have been deletedpbl
symref = SymbolicReference.create(rw_repo, symref_path, cur_head.reference)
# test symbolic references which are not at default locations like HEAD
# or FETCH_HEAD - they may also be at spots in refs of course
symbol_ref_path = "refs/symbol_ref"
symref = SymbolicReference(rw_repo, symbol_ref_path)
assert symref.path == symbol_ref_path
symbol_ref_abspath = os.path.join(rw_repo.git_dir, symref.path)
# set it
symref.reference = new_head
assert symref.reference == new_head
assert os.path.isfile(symbol_ref_abspath)
assert symref.commit == new_head.commit
for name in ('absname', 'folder/rela_name'):
symref_new_name = symref.rename(name)
assert isinstance(symref_new_name, SymbolicReference)
assert name in symref_new_name.path
assert symref_new_name.reference == new_head
assert symref_new_name == symref
assert not symref.is_detached
# END for each ref
# create a new non-head ref just to be sure we handle it even if packed
Reference.create(rw_repo, full_ref)
# test ref listing - assure we have packed refs
rw_repo.git.pack_refs(all=True, prune=True)
heads = rw_repo.heads
assert heads
assert new_head in heads
assert active_branch in heads
assert rw_repo.tags
# we should be able to iterate all symbolic refs as well - in that case
# we should expect only symbolic references to be returned
for symref in SymbolicReference.iter_items(rw_repo):
assert not symref.is_detached
# when iterating references, we can get references and symrefs
# when deleting all refs, I'd expect them to be gone ! Even from
# the packed ones
# For this to work, we must not be on any branch
rw_repo.head.reference = rw_repo.head.commit
deleted_refs = set()
for ref in Reference.iter_items(rw_repo):
if ref.is_detached:
ref.delete(rw_repo, ref)
deleted_refs.add(ref)
# END delete ref
# END for each ref to iterate and to delete
assert deleted_refs
for ref in Reference.iter_items(rw_repo):
if ref.is_detached:
assert ref not in deleted_refs
# END for each ref
# reattach head - head will not be returned if it is not a symbolic
# ref
rw_repo.head.reference = Head.create(rw_repo, "master")
# At least the head should still exist
assert os.path.isfile(os.path.join(rw_repo.git_dir, 'HEAD'))
refs = list(SymbolicReference.iter_items(rw_repo))
assert len(refs) == 1
# test creation of new refs from scratch
for path in ("basename", "dir/somename", "dir2/subdir/basename"):
# REFERENCES
############
fpath = Reference.to_full_path(path)
ref_fp = Reference.from_path(rw_repo, fpath)
assert not ref_fp.is_valid()
ref = Reference(rw_repo, fpath)
assert ref == ref_fp
# can be created by assigning a commit
ref.commit = rw_repo.head.commit
assert ref.is_valid()
# if the assignment raises, the ref doesn't exist
Reference.delete(ref.repo, ref.path)
assert not ref.is_valid()
self.failUnlessRaises(ValueError, setattr, ref, 'commit', "nonsense")
assert not ref.is_valid()
# I am sure I had my reason to make it a class method at first, but
# now it doesn't make so much sense anymore, want an instance method as well
# See http://byronimo.lighthouseapp.com/projects/51787-gitpython/tickets/27
Reference.delete(ref.repo, ref.path)
assert not ref.is_valid()
ref.object = rw_repo.head.commit
assert ref.is_valid()
Reference.delete(ref.repo, ref.path)
assert not ref.is_valid()
self.failUnlessRaises(ValueError, setattr, ref, 'object', "nonsense")
assert not ref.is_valid()
def test_head_reset(self, rw_repo):
cur_head = rw_repo.head
old_head_commit = cur_head.commit
new_head_commit = cur_head.ref.commit.parents[0]
cur_head.reset(new_head_commit, index=True) # index only
assert cur_head.reference.commit == new_head_commit
self.failUnlessRaises(ValueError, cur_head.reset, new_head_commit, index=False, working_tree=True)
new_head_commit = new_head_commit.parents[0]
cur_head.reset(new_head_commit, index=True, working_tree=True) # index + wt
assert cur_head.reference.commit == new_head_commit
# paths - make sure we have something to do
rw_repo.index.reset(old_head_commit.parents[0])
cur_head.reset(cur_head, paths="test")
cur_head.reset(new_head_commit, paths="lib")
# hard resets with paths don't work, its all or nothing
self.failUnlessRaises(GitCommandError, cur_head.reset, new_head_commit, working_tree=True, paths="lib")
# we can do a mixed reset, and then checkout from the index though
cur_head.reset(new_head_commit)
rw_repo.index.checkout(["lib"], force=True)
# now that we have a write write repo, change the HEAD reference - its
# like git-reset --soft
heads = rw_repo.heads
assert heads
for head in heads:
cur_head.reference = head
assert cur_head.reference == head
assert isinstance(cur_head.reference, Head)
assert cur_head.commit == head.commit
assert not cur_head.is_detached
# END for each head
# detach
active_head = heads[0]
curhead_commit = active_head.commit
cur_head.reference = curhead_commit
assert cur_head.commit == curhead_commit
assert cur_head.is_detached
self.failUnlessRaises(TypeError, getattr, cur_head, "reference")
# tags are references, hence we can point to them
some_tag = rw_repo.tags[0]
cur_head.reference = some_tag
assert not cur_head.is_detached
assert cur_head.commit == some_tag.commit
assert isinstance(cur_head.reference, TagReference)
# put HEAD back to a real head, otherwise everything else fails
cur_head.reference = active_head
# type check
self.failUnlessRaises(ValueError, setattr, cur_head, "reference", "that")
# head handling
commit = 'HEAD'
prev_head_commit = cur_head.commit
for count, new_name in enumerate(("my_new_head", "feature/feature1")):
actual_commit = commit + "^" * count
new_head = Head.create(rw_repo, new_name, actual_commit)
assert new_head.is_detached
assert cur_head.commit == prev_head_commit
assert isinstance(new_head, Head)
# already exists, but has the same value, so its fine
Head.create(rw_repo, new_name, new_head.commit)
# its not fine with a different value
self.failUnlessRaises(OSError, Head.create, rw_repo, new_name, new_head.commit.parents[0])
# force it
new_head = Head.create(rw_repo, new_name, actual_commit, force=True)
old_path = new_head.path
old_name = new_head.name
assert new_head.rename("hello").name == "hello"
assert new_head.rename("hello/world").name == "hello/world"
assert new_head.rename(old_name).name == old_name and new_head.path == old_path
# rename with force
tmp_head = Head.create(rw_repo, "tmphead")
self.failUnlessRaises(GitCommandError, tmp_head.rename, new_head)
tmp_head.rename(new_head, force=True)
assert tmp_head == new_head and tmp_head.object == new_head.object
logfile = RefLog.path(tmp_head)
assert osp.isfile(logfile)
Head.delete(rw_repo, tmp_head)
# deletion removes the log as well
assert not osp.isfile(logfile)
heads = rw_repo.heads
assert tmp_head not in heads and new_head not in heads
# force on deletion testing would be missing here, code looks okay though ;)
# END for each new head name
self.failUnlessRaises(TypeError, RemoteReference.create, rw_repo, "some_name")
# tag ref
tag_name = "5.0.2"
TagReference.create(rw_repo, tag_name)
self.failUnlessRaises(GitCommandError, TagReference.create, rw_repo, tag_name)
light_tag = TagReference.create(rw_repo, tag_name, "HEAD~1", force=True)
assert isinstance(light_tag, TagReference)
assert light_tag.name == tag_name
assert light_tag.commit == cur_head.commit.parents[0]
assert light_tag.tag is None
# tag with tag object
other_tag_name = "releases/1.0.2RC"
msg = "my mighty tag\nsecond line"
obj_tag = TagReference.create(rw_repo, other_tag_name, message=msg)
assert isinstance(obj_tag, TagReference)
assert obj_tag.name == other_tag_name
assert obj_tag.commit == cur_head.commit
assert obj_tag.tag is not None
TagReference.delete(rw_repo, light_tag, obj_tag)
tags = rw_repo.tags
assert light_tag not in tags and obj_tag not in tags
# remote deletion
remote_refs_so_far = 0
remotes = rw_repo.remotes
assert remotes
for remote in remotes:
refs = remote.refs
# If a HEAD exists, it must be deleted first. Otherwise it might
# end up pointing to an invalid ref it the ref was deleted before.
remote_head_name = "HEAD"
if remote_head_name in refs:
RemoteReference.delete(rw_repo, refs[remote_head_name])
del(refs[remote_head_name])
# END handle HEAD deletion
RemoteReference.delete(rw_repo, *refs)
remote_refs_so_far += len(refs)
for ref in refs:
assert ref.remote_name == remote.name
# END for each ref to delete
assert remote_refs_so_far
for remote in remotes:
# remotes without references should produce an empty list
self.assertEqual(remote.refs, [])
# END for each remote
# change where the active head points to
if cur_head.is_detached:
cur_head.reference = rw_repo.heads[0]
head = cur_head.reference
old_commit = head.commit
head.commit = old_commit.parents[0]
assert head.commit == old_commit.parents[0]
assert head.commit == cur_head.commit
head.commit = old_commit
# setting a non-commit as commit fails, but succeeds as object
head_tree = head.commit.tree
self.failUnlessRaises(ValueError, setattr, head, 'commit', head_tree)
assert head.commit == old_commit # and the ref did not change
# we allow heds to point to any object
head.object = head_tree
assert head.object == head_tree
# cannot query tree as commit
self.failUnlessRaises(TypeError, getattr, head, 'commit')
# set the commit directly using the head. This would never detach the head
assert not cur_head.is_detached
head.object = old_commit
cur_head.reference = head.commit
assert cur_head.is_detached
parent_commit = head.commit.parents[0]
assert cur_head.is_detached
cur_head.commit = parent_commit
assert cur_head.is_detached and cur_head.commit == parent_commit
cur_head.reference = head
assert not cur_head.is_detached
cur_head.commit = parent_commit
assert not cur_head.is_detached
assert head.commit == parent_commit
# test checkout
active_branch = rw_repo.active_branch
for head in rw_repo.heads:
checked_out_head = head.checkout()
assert checked_out_head == head
# END for each head to checkout
# checkout with branch creation
new_head = active_branch.checkout(b="new_head")
assert active_branch != rw_repo.active_branch
assert new_head == rw_repo.active_branch
# checkout with force as we have a changed a file
# clear file
open(new_head.commit.tree.blobs[-1].abspath, 'w').close()
assert len(new_head.commit.diff(None))
# create a new branch that is likely to touch the file we changed
far_away_head = rw_repo.create_head("far_head", 'HEAD~100')
self.failUnlessRaises(GitCommandError, far_away_head.checkout)
assert active_branch == active_branch.checkout(force=True)
assert rw_repo.head.reference != far_away_head
# test reference creation
partial_ref = 'sub/ref'
full_ref = 'refs/%s' % partial_ref
ref = Reference.create(rw_repo, partial_ref)
assert ref.path == full_ref
assert ref.object == rw_repo.head.commit
self.failUnlessRaises(OSError, Reference.create, rw_repo, full_ref, 'HEAD~20')
# it works if it is at the same spot though and points to the same reference
assert Reference.create(rw_repo, full_ref, 'HEAD').path == full_ref
Reference.delete(rw_repo, full_ref)
# recreate the reference using a full_ref
ref = Reference.create(rw_repo, full_ref)
assert ref.path == full_ref
assert ref.object == rw_repo.head.commit
# recreate using force
ref = Reference.create(rw_repo, partial_ref, 'HEAD~1', force=True)
assert ref.path == full_ref
assert ref.object == rw_repo.head.commit.parents[0]
# rename it
orig_obj = ref.object
for name in ('refs/absname', 'rela_name', 'feature/rela_name'):
ref_new_name = ref.rename(name)
assert isinstance(ref_new_name, Reference)
assert name in ref_new_name.path
assert ref_new_name.object == orig_obj
assert ref_new_name == ref
# END for each name type
# References that don't exist trigger an error if we want to access them
self.failUnlessRaises(ValueError, getattr, Reference(rw_repo, "refs/doesntexist"), 'commit')
# exists, fail unless we force
ex_ref_path = far_away_head.path
self.failUnlessRaises(OSError, ref.rename, ex_ref_path)
# if it points to the same commit it works
far_away_head.commit = ref.commit
ref.rename(ex_ref_path)
assert ref.path == ex_ref_path and ref.object == orig_obj
assert ref.rename(ref.path).path == ex_ref_path # rename to same name
# create symbolic refs
symref_path = "symrefs/sym"
symref = SymbolicReference.create(rw_repo, symref_path, cur_head.reference)
assert symref.path == symref_path
assert symref.reference == cur_head.reference
self.failUnlessRaises(OSError, SymbolicReference.create, rw_repo, symref_path, cur_head.reference.commit)
# it works if the new ref points to the same reference
SymbolicReference.create(rw_repo, symref.path, symref.reference).path == symref.path # @NoEffect
SymbolicReference.delete(rw_repo, symref)
# would raise if the symref wouldn't have been deletedpbl
symref = SymbolicReference.create(rw_repo, symref_path, cur_head.reference)
# test symbolic references which are not at default locations like HEAD
# or FETCH_HEAD - they may also be at spots in refs of course
symbol_ref_path = "refs/symbol_ref"
symref = SymbolicReference(rw_repo, symbol_ref_path)
assert symref.path == symbol_ref_path
symbol_ref_abspath = osp.join(rw_repo.git_dir, symref.path)
# set it
symref.reference = new_head
assert symref.reference == new_head
assert osp.isfile(symbol_ref_abspath)
assert symref.commit == new_head.commit
for name in ('absname', 'folder/rela_name'):
symref_new_name = symref.rename(name)
assert isinstance(symref_new_name, SymbolicReference)
assert name in symref_new_name.path
assert symref_new_name.reference == new_head
assert symref_new_name == symref
assert not symref.is_detached
# END for each ref
# create a new non-head ref just to be sure we handle it even if packed
Reference.create(rw_repo, full_ref)
# test ref listing - assure we have packed refs
rw_repo.git.pack_refs(all=True, prune=True)
heads = rw_repo.heads
assert heads
assert new_head in heads
assert active_branch in heads
assert rw_repo.tags
# we should be able to iterate all symbolic refs as well - in that case
# we should expect only symbolic references to be returned
for symref in SymbolicReference.iter_items(rw_repo):
assert not symref.is_detached
# when iterating references, we can get references and symrefs
# when deleting all refs, I'd expect them to be gone ! Even from
# the packed ones
# For this to work, we must not be on any branch
rw_repo.head.reference = rw_repo.head.commit
deleted_refs = set()
for ref in Reference.iter_items(rw_repo):
if ref.is_detached:
ref.delete(rw_repo, ref)
deleted_refs.add(ref)
# END delete ref
# END for each ref to iterate and to delete
assert deleted_refs
for ref in Reference.iter_items(rw_repo):
if ref.is_detached:
assert ref not in deleted_refs
# END for each ref
# reattach head - head will not be returned if it is not a symbolic
# ref
rw_repo.head.reference = Head.create(rw_repo, "master")
# At least the head should still exist
assert osp.isfile(osp.join(rw_repo.git_dir, 'HEAD'))
refs = list(SymbolicReference.iter_items(rw_repo))
assert len(refs) == 1
# test creation of new refs from scratch
for path in ("basename", "dir/somename", "dir2/subdir/basename"):
# REFERENCES
############
fpath = Reference.to_full_path(path)
ref_fp = Reference.from_path(rw_repo, fpath)
assert not ref_fp.is_valid()
ref = Reference(rw_repo, fpath)
assert ref == ref_fp
# can be created by assigning a commit
ref.commit = rw_repo.head.commit
assert ref.is_valid()
# if the assignment raises, the ref doesn't exist
Reference.delete(ref.repo, ref.path)
assert not ref.is_valid()
self.failUnlessRaises(ValueError, setattr, ref, 'commit', "nonsense")
assert not ref.is_valid()
# I am sure I had my reason to make it a class method at first, but
# now it doesn't make so much sense anymore, want an instance method as well
# See http://byronimo.lighthouseapp.com/projects/51787-gitpython/tickets/27
Reference.delete(ref.repo, ref.path)
assert not ref.is_valid()
ref.object = rw_repo.head.commit
assert ref.is_valid()
Reference.delete(ref.repo, ref.path)
assert not ref.is_valid()
self.failUnlessRaises(ValueError, setattr, ref, 'object', "nonsense")
assert not ref.is_valid()