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"""Miscellaneous utility functions for git structures"""
from base64 import b16encode
from pomu.util.result import Result
def parse_tree(blob):
"""Parses a git tree"""
res = []
leng, _, tree = blob.partition('\0')
if not tree:
return Result.Err('Invalid tree')
while len(data) > 0:
data = data[7:] # strip access code
name, _, data = data.partition('\0')
sha = b16encode(data[0:20]).decode('utf-8')
data = data[20:]
if not name or not sha:
return Result.Err()
res.append((sha, name))
return Result.Ok(res)
def parse_blob(blob):
"""Parses a git blob"""
data = zlib.decompress(blob)
leng, _, data = data.partition('\0')
if not leng or not data:
return Result.Err()
def commit_head(blob):
if not blob[7:] == 'commit ':
return Result.Err()
l = blob.split('\n')[0]
cid, _, tid = l.partition('\0')
if not tid[0:5] == 'tree ':
return Result.Err()
return tid[5:]
def parse_object(obj):
"""Parses a git object"""
data = zlib.decompress(obj)
if data[0:5] == 'blob ':
return parse_blob(data[5:])
elif data[0:5] == 'tree ':
return parse_tree(data[5:])
return Result.Err('Unsupported object type')
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