def remove_if_equals(self, name, old_ref, committer=None, timestamp=None,
timezone=None, message=None):
"""Remove a refname only if it currently equals old_ref.
This method does not follow symbolic references. It can be used to
perform an atomic compare-and-delete operation.
:param name: The refname to delete.
:param old_ref: The old sha the refname must refer to, or None to
delete unconditionally.
:param message: Optional message
:return: True if the delete was successful, False otherwise.
"""
self._check_refname(name)
filename = self.refpath(name)
ensure_dir_exists(os.path.dirname(filename))
f = GitFile(filename, 'wb')
try:
if old_ref is not None:
orig_ref = self.read_loose_ref(name)
if orig_ref is None:
orig_ref = self.get_packed_refs().get(name, ZERO_SHA)
if orig_ref != old_ref:
return False
# remove the reference file itself
try:
os.remove(filename)
except OSError as e:
if e.errno != errno.ENOENT: # may only be packed
raise
self._remove_packed_ref(name)
self._log(name, old_ref, None, committer=committer,
timestamp=timestamp, timezone=timezone, message=message)
finally:
# never write, we just wanted the lock
f.abort()
# outside of the lock, clean-up any parent directory that might now
# be empty. this ensures that re-creating a reference of the same
# name of what was previously a directory works as expected
parent = name
while True:
try:
parent, _ = parent.rsplit(b'/', 1)
except ValueError:
break
parent_filename = self.refpath(parent)
try:
os.rmdir(parent_filename)
except OSError as e:
# this can be caused by the parent directory being
# removed by another process, being not empty, etc.
# in any case, this is non fatal because we already
# removed the reference, just ignore it
break
return True
def test_abort_close_removed(self):
foo = self.path('foo')
f = GitFile(foo, 'wb')
f._file.close()
os.remove(foo + ".lock")
f.abort()
self.assertTrue(f._closed)
def test_abort_close(self):
foo = self.path('foo')
f = GitFile(foo, 'wb')
f.abort()
try:
f.close()
except (IOError, OSError):
self.fail()
f = GitFile(foo, 'wb')
f.close()
try:
f.abort()
except (IOError, OSError):
self.fail()
def test_abort(self):
foo = self.path('foo')
foo_lock = '%s.lock' % foo
orig_f = open(foo, 'rb')
self.assertEqual(orig_f.read(), b'foo contents')
orig_f.close()
f = GitFile(foo, 'wb')
f.write(b'new contents')
f.abort()
self.assertTrue(f.closed)
self.assertFalse(os.path.exists(foo_lock))
new_orig_f = open(foo, 'rb')
self.assertEqual(new_orig_f.read(), b'foo contents')
new_orig_f.close()
def _remove_packed_ref(self, name):
if self._packed_refs is None:
return
filename = os.path.join(self.path, b'packed-refs')
# reread cached refs from disk, while holding the lock
f = GitFile(filename, 'wb')
try:
self._packed_refs = None
self.get_packed_refs()
if name not in self._packed_refs:
return
del self._packed_refs[name]
if name in self._peeled_refs:
del self._peeled_refs[name]
write_packed_refs(f, self._packed_refs, self._peeled_refs)
f.close()
finally:
f.abort()
def set_symbolic_ref(self, name, other, committer=None, timestamp=None,
timezone=None, message=None):
"""Make a ref point at another ref.
:param name: Name of the ref to set
:param other: Name of the ref to point at
:param message: Optional message to describe the change
"""
self._check_refname(name)
self._check_refname(other)
filename = self.refpath(name)
f = GitFile(filename, 'wb')
try:
f.write(SYMREF + other + b'\n')
sha = self.follow(name)[-1]
self._log(name, sha, sha, committer=committer,
timestamp=timestamp, timezone=timezone,
message=message)
except BaseException:
f.abort()
raise
else:
f.close()
def _complete_thin_pack(self, f, path, copier, indexer):
"""Move a specific file containing a pack into the pack directory.
:note: The file should be on the same file system as the
packs directory.
:param f: Open file object for the pack.
:param path: Path to the pack file.
:param copier: A PackStreamCopier to use for writing pack data.
:param indexer: A PackIndexer for indexing the pack.
"""
entries = list(indexer)
# Update the header with the new number of objects.
f.seek(0)
write_pack_header(f, len(entries) + len(indexer.ext_refs()))
# Must flush before reading (http://bugs.python.org/issue3207)
f.flush()
# Rescan the rest of the pack, computing the SHA with the new header.
new_sha = compute_file_sha(f, end_ofs=-20)
# Must reposition before writing (http://bugs.python.org/issue3207)
f.seek(0, os.SEEK_CUR)
# Complete the pack.
for ext_sha in indexer.ext_refs():
assert len(ext_sha) == 20
type_num, data = self.get_raw(ext_sha)
offset = f.tell()
crc32 = write_pack_object(f, type_num, data, sha=new_sha)
entries.append((ext_sha, offset, crc32))
pack_sha = new_sha.digest()
f.write(pack_sha)
f.close()
# Move the pack in.
entries.sort()
pack_base_name = self._get_pack_basepath(entries)
target_pack = pack_base_name + '.pack'
if sys.platform == 'win32':
# Windows might have the target pack file lingering. Attempt
# removal, silently passing if the target does not exist.
try:
os.remove(target_pack)
except (IOError, OSError) as e:
if e.errno != errno.ENOENT:
raise
os.rename(path, target_pack)
# Write the index.
index_file = GitFile(pack_base_name + '.idx', 'wb')
try:
write_pack_index_v2(index_file, entries, pack_sha)
index_file.close()
finally:
index_file.abort()
# Add the pack to the store and return it.
final_pack = Pack(pack_base_name)
final_pack.check_length_and_checksum()
self._add_known_pack(pack_base_name, final_pack)
return final_pack