def generic_object_read(repo: GitRepository, sha: Sha) -> GitObject:
"""Read object object_id from Git repository repo. Return a GitObject whose exact
type depends on the object"""
path = repo_file(repo, "objects", sha[0:2], sha[2:])
assert path is not None, f"Path {path} for object {sha} could not be found"
raw = zlib_read(path)
# Read object type
x = raw.find(b' ')
fmt = raw[0:x]
# Read and validate object size
y = raw.find(b'\x00', x)
size = int(raw[x:y].decode("ascii"))
if size != len(raw) - y - 1:
raise ValueError(f"Malformed object {sha}: bad length")
# Pick constructor
if fmt == b'commit':
return GitCommit(repo, raw[y + 1:])
elif fmt == b'tree':
return GitTree(repo, raw[y + 1:])
elif fmt == b'tag':
return GitTag(repo, raw[y + 1:])
elif fmt == b'blob':
return GitBlob(repo, raw[y + 1:])
else:
raise ValueError(
f"Unknown type {fmt.decode('ascii')} for object {sha}")
def object_get_type(repo: GitRepository, sha: Sha) -> bytes:
"""Read object object_id from Git repository repo. Return a GitObject whose exact
type depends on the object"""
path = repo_file(repo, "objects", sha[0:2], sha[2:])
assert path is not None, f"Path {path} for object {sha} could not be found"
raw = zlib_read(path)
# Read object type
x = raw.find(b' ')
return raw[0:x]