1067 lines
32 KiB
Python
1067 lines
32 KiB
Python
import argparse
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import collections
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import configparser
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from datetime import datetime
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from fnmatch import fnmatch
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import hashlib
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from math import ceil
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import os
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import re
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import sys
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import zlib
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argparser = argparse.ArgumentParser(description="The stupidest content tracker")
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argsubparsers = argparser.add_subparsers(title="Commands", dest="command")
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argsubparsers.required = True
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def main(argv=sys.argv[1:]):
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args = argparser.parse_args(argv)
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match args.command:
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case "add" : cmd_add(args)
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case "cat-file" : cmd_cat_file(args)
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case "check-ignore" : cmd_check_ignore(args)
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case "checkout" : cmd_checkout(args)
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case "commit" : cmd_commit(args)
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case "hash-object" : cmd_hash_object(args)
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case "init" : cmd_init(args)
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case "log" : cmd_log(args)
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case "ls-files" : cmd_ls_files(args)
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case "ls-tree" : cmd_ls_tree(args)
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case "rev-parse" : cmd_rev_parse(args)
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case "rm" : cmd_rm(args)
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case "show-ref" : cmd_show_ref(args)
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case "status" : cmd_status(args)
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case "tag" : cmd_tag(args)
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case _ : print("Bad command.")
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class GitRepository (object):
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"""A git repo"""
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worktree = None
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gitdir = None
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conf = None
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def __init__(self, path, force=False):
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self.worktree = path
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self.gitdir = os.path.join(path, ".git")
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if not (force or os.path.isdir(self.gitdir)):
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raise Exception(f"Not a git repository {path}")
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# Read configuration file in .git/config
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self.conf = configparser.ConfigParser()
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cf = GitRepository.repo_file(self, "config")
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if cf and os.path.exists(cf):
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self.conf.read([cf])
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elif not force:
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raise Exception("Configuration file missing")
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if not force:
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vers = int(self.conf.get("core", "repositoryformatversion"))
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if vers != 0:
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raise Exception(f"Unsupported repositoryformatversion {vers}")
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def repo_path(repo, *path):
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"""Compute path under repo's gitdir."""
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return os.path.join(repo.gitdir, *path)
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def repo_file(repo, *path, mkdir=False):
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"""Same as repo_path, but create dirname(*path) if absent. For
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example, repo_file(r, \"refs\", \"remotes\", \"origin\", \"HEAD\") will create
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.git/refs/remotes/origin."""
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if GitRepository.repo_dir(repo, *path[:-1], mkdir=mkdir):
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return GitRepository.repo_path(repo, *path)
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def repo_dir(repo, *path, mkdir=False):
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"""Same as repo_path, bt mkdir *path if absent if mkdir"""
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path = GitRepository.repo_path(repo, *path)
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if (os.path.exists(path)):
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if (os.path.isdir(path)):
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return path
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else:
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raise Exception(f"Not a directory {path}")
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if mkdir:
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os.makedirs(path)
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return path
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else:
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return None
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def repo_create(path):
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"""Create a new repository at path."""
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repo = GitRepository(path, True)
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# First, we make sure the path either doesn't exist or is an
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# empty dir.
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if os.path.exists(repo.worktree):
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if not os.path.isdir(repo.worktree):
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raise Exception(f"{path} is not a directory!")
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if os.path.exists(repo.gitdir) and os.listdir(repo.gitdir):
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raise Exception(f"{path} is not empty!")
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else:
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os.makedirs(repo.worktree)
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assert GitRepository.repo_dir(repo, "branches", mkdir=True)
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assert GitRepository.repo_dir(repo, "objects", mkdir=True)
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assert GitRepository.repo_dir(repo, "refs", "tags", mkdir=True)
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assert GitRepository.repo_dir(repo, "refs", "heads", mkdir=True)
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# .git/description
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with open(GitRepository.repo_file(repo, "description"), "w") as f:
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f.write("Unnamed repository; edit this file 'description' to name the repository")
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with open(GitRepository.repo_file(repo, "HEAD"), "w") as f:
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f.write("ref: refs/heads/master\n")
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with open(GitRepository.repo_file(repo, "config"), "w") as f:
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config = repo_default_config()
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config.write(f)
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return repo
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def repo_default_config():
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ret = configparser.ConfigParser()
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ret.add_section("core")
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ret.set("core", "repositoryformatVersion", "0")
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ret.set("core", "filemode", "false")
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ret.set("core", "bare", "false")
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return ret
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argsp = argsubparsers.add_parser("init", help="Initialize a new, empty repository.")
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argsp.add_argument("path",
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metavar="directory",
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nargs="?",
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default=".",
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help="Where to create the repository.")
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def cmd_init(args):
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repo_create(args.path)
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def repo_find(path=".", required=True):
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path = os.path.realpath(path)
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if os.path.isdir(os.path.join(path, ".git")):
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return GitRepository(path)
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# If we haven't returned, recurse in parent
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parent = os.path.realpath(os.path.join(path, ".."))
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match os.name:
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case "nt":
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is_root = os.path.splitdrive(path)[1] == "\\"
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case "posix":
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# If parent==path, then path is root.
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is_root = parent == path
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case _:
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raise Exception(f"Unsupported os {os.name}")
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if is_root:
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if required:
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raise Exception("No git directory.")
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else:
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return None
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# Recursive case
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return repo_find(parent, required)
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argsp = argsubparsers.add_parser("status", help="Get the status of the repo")
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argsp.add_argument("path",
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metavar="directory",
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nargs="?",
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default=".",
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help="Which directory")
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def cmd_status(args):
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# TODO: actually get status
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print(repo_find(args.path).worktree)
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class GitObject (object):
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def __init__(self, data=None):
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if data != None:
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self.deserialize(data)
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else:
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self.init()
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def serialize(self, repo):
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"""This function MUST be implemented by subclasses.
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It must read the object's contents from self.data, a byte string, and
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do whatever it takes to convert it into a meaningful representation. What exactly that means depends on each subclass."""
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raise Exception("Unimplemented!")
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def deserialize(self, repo):
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raise Exception("Unimplemented!")
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def init(self):
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pass # other implementations might do something here
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def object_read(repo, sha):
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"""Read object sha from Git repository repo. Return a
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GitObject whose exact type depends on the object."""
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path = GitRepository.repo_file(repo, "objects", sha[0:2], sha[2:])
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if not os.path.isfile(path):
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return None
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with open(path, "rb") as f:
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raw = zlib.decompress(f.read())
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# Read object type
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x = raw.find(b' ')
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fmt = raw[0:x]
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# Read and validate object size
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y = raw.find(b'\x00', x)
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size = int(raw[x:y].decode("ascii"))
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if size != len(raw)-y-1:
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raise Exception(f"Malformed object {sha}: bad length")
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match fmt:
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case b'commit' : c=GitCommit
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case b'tree' : c=GitTree
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case b'tag' : c=GitTag
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case b'blob' : c=GitBlob
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case _:
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raise Exception(f"Unknown type {fmt.decode('ascii')} for object {sha}")
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return c(raw[y+1:])
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def object_write(obj, repo=None):
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data = obj.serialize()
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# Add header
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result = obj.fmt + b' ' + str(len(data)).encode() + b'\x00' + data
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# Compute hash
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sha = hashlib.sha1(result).hexdigest()
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if repo:
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# Compute path
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path=GitRepository.repo_file(repo, "objects", sha[0:2], sha[2:], mkdir=True)
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if not os.path.exists(path):
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with open(path, 'wb') as f:
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f.write(zlib.compress(result))
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return sha
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class GitBlob(GitObject):
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fmt=b'blob'
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def serialize(self):
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return self.blobdata
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def deserialize(self, data):
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self.blobdata = data
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argsp = argsubparsers.add_parser("cat-file",
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help="Provide content of repository objects")
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argsp.add_argument("type",
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metavar="type",
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choices=["blob", "commit", "tag", "tree"],
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help="Specify the type")
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argsp.add_argument("object",
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metavar="object",
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help="The object to display")
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def cmd_cat_file(args):
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repo = repo_find()
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cat_file(repo, args.object, fmt=args.type.encode())
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def cat_file(repo, obj, fmt=None):
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obj = object_read(repo, object_find(repo, obj, fmt=fmt))
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sys.stdout.buffer.write(obj.serialize())
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def object_find(repo, name, fmt=None, follow=True):
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sha = object_resolve(repo, name)
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if not sha:
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raise Exception(f"No such reference {name}")
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if len(sha) > 1:
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raise Exception(f"Ambiguous reference {0}: Candidates are:\n - {1}.".format(name, "\n - ".join(sha)))
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sha = sha[0]
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if not fmt:
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return sha
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while True:
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obj = object_read(repo, sha)
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if obj.fmt == fmt:
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return sha
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if not follow:
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return None
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if obj.fmt == b'tag':
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sha = obj.kvlm[b'object'].decode("ascii")
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elif obj.fmt == b'commit' and fmt == b'tree':
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sha = obj.kvlm[b'tree'].decode("ascii")
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else:
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return None
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argsp = argsubparsers.add_parser(
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"hash-object",
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help="Compute object ID an optionally creates a blob from a file")
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argsp.add_argument("-t",
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metavar="type",
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dest="type",
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choices=["blob", "commit", "tag", "tree"],
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default="blob",
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help="Specify the type")
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argsp.add_argument("-w",
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dest="write",
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action="store_true",
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help="Actually write the object into the database")
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argsp.add_argument("path",
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help="Read object from <file>")
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def cmd_hash_object(args):
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if args.write:
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repo = repo_find()
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else:
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repo = None
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with open(args.path, "rb") as fd:
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sha = object_hash(fd, args.type.encode(), repo)
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print(sha)
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def object_hash(fd, fmt, repo=None):
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"""Hash object, writing it to repo if provided"""
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data = fd.read()
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match fmt:
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case b'commit' : obj=GitCommit(data)
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case b'tree' : obj=GitTree(data)
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case b'tag' : obj=GitTag(data)
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case b'blob' : obj=GitBlob(data)
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case _ : raise Exception(f"Unknown type {fmt}")
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return object_write(obj, repo)
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def kvlm_parse(raw, start=0, dct=None):
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if not dct:
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dct = collections.OrderedDict()
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# You CANNOT declare the argument as dct=OrderedDict() or all
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# call to the functions will endlessly grow the same dict.
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# This function is recursive: it reads a key/value pair, then call
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# itself back with the new position. So we first need to know
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# where we are: at a keyword, or already in the messageQ
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# We search for the next space and the next newline.
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spc = raw.find(b' ', start)
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nl = raw.find(b'\n', start)
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# If space appears before newline, we have a keyword. Otherwise,
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# it's the final message, which we just read to the end of the file.
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# Base case
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# =========
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#
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# If newline appears first (or there's no space at all), we asume
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# a blank line. A blank line means the remainder of the data is the
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# message. We store it in the dictionary, with None as the key, and
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# return.
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if (spc < 0) or (nl < spc):
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assert nl == start
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dct[None] = raw[start+1:]
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return dct
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# Recursive case
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# ==============
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#
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# We read a key-value pair and recurse for the next.
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key = raw[start:spc]
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# Find the end of the value. Continuation lines begin with a
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# space, so we loop until we find a "\n" not followed by a space.
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end = start
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while True:
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end = raw.find(b'\n', end+1)
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if raw[end+1] != ord(' '): break
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value = raw[spc+1:end].replace(b'\n ', b'\n')
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# Don't overwrite existing data contents
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if key in dct:
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if type(dct[key]) == list:
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dct[key].append(value)
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else:
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dct[key] = [ dct[key], value ]
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else:
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dct[key] = value
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return kvlm_parse(raw, start=end+1, dct=dct)
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def kvlm_serialize(kvlm):
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ret = b''
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# Output fiels
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for k in kvlm.keys():
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# Skip the message itself
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if k == None: continue
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val = kvlm[k]
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# Normalize to a list
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if type(val) != list:
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val = [ val ]
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for v in val:
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ret += k + b' ' + (v.replace(b'\n', b'\n ')) + b'\n'
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ret += b'\n' + kvlm[None] + b'\n'
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return ret
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class GitCommit(GitObject):
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fmt = b'commit'
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def deserialize(self, data):
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self.kvlm = kvlm_parse(data)
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def serialize(self):
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return kvlm_serialize(self.kvlm)
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def init(self):
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self.kvlm = dict()
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argsp = argsubparsers.add_parser("log", help="Display history of a given commit.")
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argsp.add_argument("commit",
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default="HEAD",
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nargs="?",
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help="Commit to start at.")
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def cmd_log(args):
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repo = repo_find()
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print("digraph wyaglog{")
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print(" node[shape=rect]")
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log_graphviz(repo, object_find(repo, args.commit), set())
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print("}")
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def log_graphviz(repo, sha, seen):
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if sha in seen:
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return
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seen.add(sha)
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commit = object_read(repo, sha)
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short_hash = sha[0:8]
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message = commit.kvlm[None].decode("utf8").strip()
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message = message.replace("\\", "\\\\")
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message = message.replace("\"", "\\\"")
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if "\n" in message: # keep only the first line
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message = message[:message.index("\n")]
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print(f" c_{sha} [label=\"{sha[0:7]}: {message}\"]")
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assert commit.fmt==b'commit'
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|
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if not b'parent' in commit.kvlm.keys():
|
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# Base case: the initial commit.
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return
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|
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parents = commit.kvlm[b'parent']
|
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|
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if type(parents) != list:
|
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parents = [ parents ]
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|
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for p in parents:
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p = p.decode("ascii")
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print (f" c_{sha} -> c_{p}")
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log_graphviz(repo, p, seen)
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|
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class GitTreeLeaf (object):
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def __init__(self, mode, path, sha):
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self.mode = mode
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self.path = path
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self.sha = sha
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|
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def tree_parse_one(raw, start=0):
|
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# Find the space terminator of the mode
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x = raw.find(b' ', start)
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assert x-start == 5 or x-start == 6
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mode = raw[start:x]
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if len(mode) == 5:
|
|
# Normalize to six bytes.
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mode = b"0" + mode
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|
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# Find the NULL terminator of the path
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y = raw.find(b'\x00', x)
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path = raw[x+1:y]
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sha = format(int.from_bytes(raw[y+1:y+21], "big"), "040x")
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return y+21, GitTreeLeaf(mode, path.decode('utf8'), sha)
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|
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def tree_parse(raw):
|
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pos = 0
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max = len(raw)
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ret = list()
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while pos < max:
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pos, data = tree_parse_one(raw, pos)
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ret.append(data)
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return ret
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|
|
# Notice: this isn't a comparison function, but a conversion function.
|
|
# Python's default sort doesn't accept a custom comparison function,
|
|
# like in most languages, but a 'key' argument that returns a new
|
|
# value, which is compared using the default rules. So we just return
|
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# the leaf name, with an extra '/' if it's a directory.
|
|
def tree_leaf_sort_key(leaf):
|
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if leaf.mode.startswith(b"10"):
|
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return leaf.path
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else:
|
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return leaf.path + "/"
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|
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def tree_serialize(obj):
|
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obj.items.sort(key=tree_leaf_sort_key)
|
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ret = b''
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for i in obj.items:
|
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ret += i.mode
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ret += b' '
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ret += i.path.encode("utf8")
|
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ret += b'\x00'
|
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sha = int(i.sha, 16)
|
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ret += sha.to_bytes(20, byteorder="big")
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return ret
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|
|
class GitTree(GitObject):
|
|
fmt=b'tree'
|
|
|
|
def deserialize(self, data):
|
|
self.items = tree_parse(data)
|
|
|
|
def serialize(self):
|
|
return tree_serialize(self)
|
|
|
|
def init(self):
|
|
self.items = list()
|
|
|
|
argsp = argsubparsers.add_parser("ls-tree", help="Pretty-print a tree object.")
|
|
argsp.add_argument("-r",
|
|
dest="recursive",
|
|
action="store_true",
|
|
help="Recurse into sub-trees")
|
|
|
|
argsp.add_argument("tree",
|
|
help="A tree-ish object.")
|
|
|
|
def cmd_ls_tree(args):
|
|
repo = repo_find()
|
|
ls_tree(repo, args.tree, args.recursive)
|
|
|
|
def ls_tree(repo, ref, recursive=None, prefix=""):
|
|
sha = object_find(repo, ref, fmt=b"tree")
|
|
obj = object_read(repo, sha)
|
|
for item in obj.items:
|
|
if len(item.mode) == 5:
|
|
type = item.mode[0:1]
|
|
else:
|
|
type = item.mode[0:2]
|
|
|
|
match type:
|
|
case b'04': type = "tree"
|
|
case b'10': type = "blob"
|
|
case b'12': type = "blob" # a symlink
|
|
case b'16': type = "commit" # a submodule
|
|
case _: raise Exception(f"Weird tree leaf mode {item.mode}")
|
|
|
|
if not (recursive and type=='tree'): # This is a leaf
|
|
print("{0} {1} {2}\t{3}".format(
|
|
"0" * (6 - len(item.mode)) + item.mode.decode("ascii"),
|
|
# Git's ls-tree displays the type
|
|
# of the object pointed to.
|
|
type,
|
|
item.sha,
|
|
os.path.join(prefix, item.path)
|
|
))
|
|
else: # This is a branch (vs. leaf), recurse
|
|
ls_tree(repo, item.sha, recursive, os.path.join(prefix, item.path))
|
|
|
|
argsp = argsubparsers.add_parser("checkout", help="Checkout a commit inside of a directory.")
|
|
|
|
argsp.add_argument("commit",
|
|
help="The commit or tree to checkout.")
|
|
|
|
argsp.add_argument("path",
|
|
help="The EMPTY directory to checkout on.")
|
|
|
|
def cmd_checkout(args):
|
|
repo = repo_find()
|
|
|
|
obj = object_read(repo, object_find(repo, args.commit))
|
|
|
|
# If the object is a commit, we grab its tree
|
|
if obj.fmt == b'commit':
|
|
obj = object_read(repo, obj.kvlm[b'tree'].decode("ascii"))
|
|
|
|
# Verify the path is an empty directory
|
|
if os.path.exists(args.path):
|
|
if not os.path.isdir(args.path):
|
|
raise Exception(f"This is not a directory: '{ags.path}'")
|
|
if os.listdir(args.path):
|
|
raise Exception(f"Directory '{args.path}' is not empty")
|
|
else:
|
|
os.makedirs(args.path)
|
|
|
|
tree_checkout(repo, obj, os.path.realpath(args.path))
|
|
|
|
def tree_checkout(repo, tree, path):
|
|
for item in tree.items:
|
|
obj = object_read(repo, item.sha)
|
|
dest = os.path.join(path, item.path)
|
|
|
|
if obj.fmt == b'tree':
|
|
os.mkdir(dest)
|
|
tree_checkout(repo, obj, dest)
|
|
elif obj.fmt == b'blob':
|
|
# TODO: Support symlinks (identified by mode 12*****)
|
|
with open(dest, 'wb') as f:
|
|
f.write(obj.blobdata)
|
|
|
|
def ref_resolve(repo, ref):
|
|
path = GitRepository.repo_file(repo, ref)
|
|
|
|
# Sometimes, an indirect reference may be broken. This is normal
|
|
# in one specific case: we're looking for HEAD on a new repository
|
|
# with no commits. In that case, .git/HEAD points to "ref:
|
|
# refs/heads/master", but .git/refs/heads/master doesn't exist yet
|
|
# (since there's no commit for it to refer to).
|
|
if not os.path.isfile(path):
|
|
return None
|
|
|
|
with open(path, "r") as fp:
|
|
data = fp.read()[:-1] # Drop final "\n"
|
|
|
|
if data.startswith("ref: "):
|
|
return ref_resolve(repo, data[len("ref: "):])
|
|
else:
|
|
return data
|
|
|
|
def ref_list(repo, path=None):
|
|
if not path:
|
|
path = repo_dir(repo, "refs")
|
|
|
|
ret = collections.OrderedDict()
|
|
|
|
for f in sorted(os.listdir(path)):
|
|
can = os.path.join(path, f)
|
|
if os.path.isdir(can):
|
|
ret[f] = ref_list(repo, can)
|
|
else:
|
|
ret[f] = ref_resolve(repo, can)
|
|
|
|
return ret
|
|
|
|
argsp = argsubparsers.add_parser(
|
|
"tag",
|
|
help="List and create tags")
|
|
|
|
argsp.add_argument("-a",
|
|
action="store_true",
|
|
dest="create_tag_object",
|
|
help="Whether to create a tag object")
|
|
|
|
argsp.add_argument("name",
|
|
nargs="?",
|
|
help="The new tag's name")
|
|
|
|
argsp.add_argument("object",
|
|
default="HEAD",
|
|
nargs="?",
|
|
help="The object the new tag will point to")
|
|
|
|
def cmd_tag(args):
|
|
repo = repo_find()
|
|
|
|
if args.name:
|
|
tag_create(repo,
|
|
args.name,
|
|
args.object,
|
|
type="object" if args.create_tag_object else "ref")
|
|
else:
|
|
refs = ref_list(repo)
|
|
show_ref(repo, refs["tags"], with_hash=False)
|
|
|
|
def tag_create(repo, name, ref, create_tag_object=False):
|
|
sha = object_find(repo, ref)
|
|
|
|
if create_tag_object:
|
|
tag = GitTag(repo)
|
|
tag.kvlm = collections.OrderedDict()
|
|
tag.kvlm[b'object'] = sha.encode()
|
|
tag.kvlm[b'type'] = b'commit'
|
|
tag.kvlm[b'tag'] = name.encode()
|
|
tag.kvlm[b'tagger'] = b'Wyag <wyag@example.com>'
|
|
tag.kvlm[None] = b'Tag generated by wyag'
|
|
tag_sha = object_write(tag)
|
|
ref_create(repo, "tags/" + name, tag_sha)
|
|
else:
|
|
ref_create(repo, "tags/" + name, sha)
|
|
|
|
def ref_create(repo, ref_name, sha):
|
|
with open(repo_file(repo, "refs/" + ref_name), "w") as fp:
|
|
fp.write(sha + "\n")
|
|
|
|
def object_resolve(repo, name):
|
|
"""Resolve a name to an object hash in repo.
|
|
|
|
This function is aware of:
|
|
|
|
- the HEAD literal
|
|
- short and long hashes
|
|
- tags
|
|
- branches
|
|
- remote branches"""
|
|
candidates = list()
|
|
hashRE = re.compile(r"[0-9A-Fa-f]{4,40}$")
|
|
|
|
# Abort on empty string
|
|
if not name.strip():
|
|
return None
|
|
|
|
if name == "HEAD":
|
|
return [ref_resolve(repo, "HEAD")]
|
|
|
|
if hashRE.match(name):
|
|
name = name.lower()
|
|
prefix = name[0:2]
|
|
path = GitRepository.repo_dir(repo, "objects", prefix, mkdir=False)
|
|
if path:
|
|
rem = name[2:]
|
|
for f in os.listdir(path):
|
|
if f.startswith(rem):
|
|
candidates.append(prefix + f)
|
|
|
|
# Try for references
|
|
as_tag = ref_resolve(repo, "refs/tags/" + name)
|
|
if as_tag:
|
|
candidates.append(as_tag)
|
|
|
|
as_branch = ref_resolve(repo, "refs/heads/" + name)
|
|
if as_branch:
|
|
candidates.append(as_branch)
|
|
|
|
return candidates
|
|
|
|
argsp = argsubparsers.add_parser(
|
|
"rev-parse",
|
|
help="Parse revision (or other objects) identifiers")
|
|
|
|
argsp.add_argument("--wyag-type",
|
|
metavar="type",
|
|
dest="type",
|
|
choices=["blob", "commit", "tag", "tree"],
|
|
default=None,
|
|
help="Specify the expected type")
|
|
|
|
argsp.add_argument("name",
|
|
help="The name to parse")
|
|
|
|
def cmd_rev_parse(args):
|
|
if args.type:
|
|
fmt = args.type.encode()
|
|
else:
|
|
fmt = None
|
|
|
|
repo = repo_find()
|
|
|
|
print(object_find(repo, args.name, fmt, follow=True))
|
|
|
|
class GitIndexEntry (object):
|
|
def __init__(self, ctime=None, mtime=None, dev=None, ino=None,
|
|
mode_type=None, mode_perms=None, uid=None, gid=None,
|
|
fsize=None, sha=None, flag_assume_valid=None,
|
|
flag_stage=None, name=None):
|
|
# The last time a file's metadata changed. This is a pair
|
|
# (timestamp in seconds, nanoseconds)
|
|
self.ctime = ctime
|
|
# The last time a file's data changed. This is a pair
|
|
# (timestamp in seconds, nanoseconds)
|
|
self.mtime = mtime
|
|
# The ID of device containing this file
|
|
self.dev = dev
|
|
# The file's inode number
|
|
self.ino = ino
|
|
# The object type, either b1000 (regular), b1010 (symlink),
|
|
# b1110 (gitlink).
|
|
self.mode_type = mode_type
|
|
# The object permissions, and integer
|
|
self.mode_perms = mode_perms
|
|
# User ID of the owner
|
|
self.uid = uid
|
|
# Group ID of the owner
|
|
self.gid = gid
|
|
# Size of this object, in bytes
|
|
self.fize = fsize
|
|
# The object's SHA
|
|
self.sha = sha
|
|
self.flag_assume_valid = flag_assume_valid
|
|
self.flag_stage = flag_stage
|
|
# Name of the object (full path)
|
|
self.name = name
|
|
|
|
class GitIndex (object):
|
|
version = None
|
|
entries = []
|
|
# ext = None
|
|
# sha = None
|
|
|
|
def __init__(self, version=2, entries=None):
|
|
if not entries:
|
|
entries = list()
|
|
|
|
self.version = version
|
|
self.entries = entries
|
|
|
|
def index_read(repo):
|
|
index_file = GitRepository.repo_file(repo, "index")
|
|
|
|
# New repositories have no index!
|
|
if not os.path.exists(index_file):
|
|
return GitIndex()
|
|
|
|
with open(index_file, 'rb') as f:
|
|
raw = f.read()
|
|
|
|
header = raw[:12]
|
|
signature = header[:4]
|
|
assert signature == b"DIRC" # Stands for DIR Cache"
|
|
version = int.from_bytes(header[4:8], "big")
|
|
assert version == 2, "wyag only supports index file version 2"
|
|
count = int.from_bytes(header[8:12], "big")
|
|
|
|
entries = list()
|
|
|
|
content = raw[12:]
|
|
idx = 0
|
|
for i in range(0, count):
|
|
# Read creation time, as a unix timestamp (seconds since
|
|
# 1970-01-01 00:00:00, the "epoch")
|
|
ctime_s = int.from_bytes(content[idx: idx+4], "big")
|
|
# Read creation time, as nanoseconds after unix seconds
|
|
ctime_ns = int.from_bytes(content[idx+4: idx+8], "big")
|
|
# Modification time, unix timestamp
|
|
mtime_s = int.from_bytes(content[idx+8: idx+12], "big")
|
|
# Modification time, nanoseconds
|
|
mtime_ns = int.from_bytes(content[idx+12: idx+16], "big")
|
|
# Device ID
|
|
dev = int.from_bytes(content[idx+16: idx+20], "big")
|
|
# Inode
|
|
ino = int.from_bytes(content[idx+20: idx+24], "big")
|
|
# Ignored
|
|
unused = int.from_bytes(content[idx+24: idx+26], "big")
|
|
assert 0 == unused
|
|
mode = int.from_bytes(content[idx+26: idx+28], "big")
|
|
mode_type = mode >> 12
|
|
assert mode_type in [0b1000, 0b1010, 0b1110]
|
|
mode_perms = mode & 0b0000000111111111
|
|
# User ID
|
|
uid = int.from_bytes(content[idx+28: idx+32], "big")
|
|
# Group ID
|
|
gid = int.from_bytes(content[idx+32: idx+36], "big")
|
|
# Size
|
|
fsize = int.from_bytes(content[idx+36: idx+40], "big")
|
|
# SHA (object ID). We'll store it as a lowercase hex string
|
|
# for consistency
|
|
sha = format(int.from_bytes(content[idx+40: idx+60], "big"), "040x")
|
|
# Flags we're going to ignore
|
|
flags = int.from_bytes(content[idx+60: idx+62], "big")
|
|
# Parse flags
|
|
flag_assume_valid = (flags & 0b1000000000000000) != 0
|
|
flag_extended = (flags & 0b0100000000000000) != 0
|
|
assert not flag_extended
|
|
flag_stage = flags & 0b0011000000000000
|
|
# Length of the name. This is stored on 12 bits, some max value
|
|
# is 0xFFF, 4095.
|
|
name_length = flags & 0b0000111111111111
|
|
|
|
idx += 62
|
|
|
|
if name_length < 0xFFF:
|
|
assert content[idx + name_length] == 0x00
|
|
raw_name = content[idx:idx + name_length]
|
|
idx += name_length + 1
|
|
else:
|
|
print(f"Notice: Name is 0x{name_length:X} bytes long")
|
|
# TODO: This probably wasn't tested enough. It works with a
|
|
# path of exactly 0xFFF bytes. Any extra bytes broke
|
|
# something between git, my shell and my filesystem
|
|
null_idx = content.find(b'\x00', idx + 0xFFF)
|
|
raw_name = content[idx: null_idx]
|
|
idx = null_idx + 1
|
|
|
|
name = raw_name.decode("utf8")
|
|
|
|
# Data is padded on multiples of eight bytes for pointer
|
|
# alignment, so we skip as many bytes as we need for the next
|
|
# read to start at the right position.
|
|
idx = 8 * ceil(idx / 8)
|
|
|
|
entries.append(GitIndexEntry(ctime=(ctime_s, ctime_ns),
|
|
mtime=(mtime_s, mtime_ns),
|
|
dev=dev,
|
|
ino=ino,
|
|
mode_type=mode_type,
|
|
mode_perms=mode_perms,
|
|
uid=uid,
|
|
gid=gid,
|
|
fsize=fsize,
|
|
sha=sha,
|
|
flag_assume_valid=flag_assume_valid,
|
|
flag_stage=flag_stage,
|
|
name=name))
|
|
|
|
return GitIndex(version=version, entries=entries)
|
|
|
|
argsp = argsubparsers.add_parser("ls-files", help="List all the staged files")
|
|
argsp.add_argument("--verbose", action="store_true", help="Show everything.")
|
|
|
|
def cmd_ls_files(args):
|
|
repo = repo_find()
|
|
index = index_read(repo)
|
|
if args.verbose:
|
|
print(f"Index file format v{index.version}, containing {len(index.entries)} entries.")
|
|
|
|
for e in index.entries:
|
|
print(e.name)
|
|
if args.verbose:
|
|
print(" {} with perms: {:o}".format(
|
|
{0b1000: "regular file",
|
|
0b1010: "symlink",
|
|
0b1110: "git link" }[e.mode_type],
|
|
e.mode_perms))
|
|
print(f" on blob: {e.sha}")
|
|
print(" created: {}.{}, modified: {}.{}".format(
|
|
datetime.fromtimestamp(e.ctime[0]),
|
|
e.ctime[1],
|
|
datetime.fromtimestamp(e.mtime[0]),
|
|
e.mtime[1]))
|
|
print(f" device: {e.dev}, inode: {e.ino}")
|
|
print(f" uid: {e.uid} group: {e.gid}")
|
|
print(f" flags: stage={e.flag_stage} assume_valid={e.flag_assume_valid}")
|
|
|
|
argsp = argsubparsers.add_parser("check-ignore", help="Check path(s) against ignore rules.")
|
|
argsp.add_argument("path", nargs="+", help="Paths to check")
|
|
|
|
def cmd_check_ignore(args):
|
|
repo = repo_find()
|
|
rules = gitignore_read(repo)
|
|
for path in args.path:
|
|
if check_ignore(rules, path):
|
|
print(path)
|
|
|
|
def gitignore_parse1(raw):
|
|
raw = raw.strip()
|
|
|
|
if not raw or raw[0] == "#":
|
|
return None
|
|
elif raw[0] == "!":
|
|
return (raw[1:], False)
|
|
elif raw[0] == "\\":
|
|
return (raw[1:], True)
|
|
else:
|
|
return (raw, True)
|
|
|
|
def gitignore_parse(lines):
|
|
ret = list()
|
|
|
|
for line in lines:
|
|
parsed = gitignore_parse1(line)
|
|
if parsed:
|
|
ret.append(parsed)
|
|
|
|
return ret
|
|
|
|
class GitIgnore(object):
|
|
absolute = None
|
|
scoped = None
|
|
|
|
def __init__(self, absolute, scoped):
|
|
self.absolute = absolute
|
|
self.scoped = scoped
|
|
|
|
def gitignore_read(repo):
|
|
ret = GitIgnore(absolute=list(), scoped=dict())
|
|
|
|
# Read local configuration
|
|
repo_file = os.path.join(repo.gitdir, "info/exclude")
|
|
if os.path.exists(repo_file):
|
|
with open(repo_file, "r") as f:
|
|
ret.absolute.append(gitignore_parse(f.readlines()))
|
|
|
|
# Global configuration
|
|
if "XDG_CONFIG_HOME" in os.environ:
|
|
config_home == os.environ["XDG_CONFIG_HOME"]
|
|
else:
|
|
config_home = os.path.expanduser("~/.config")
|
|
global_file = os.path.join(config_home, "git/ignore")
|
|
|
|
if os.path.exists(global_file):
|
|
with open(global_file, "r") as f:
|
|
ret.absolute.append(gitignore_parse(f.readlines()))
|
|
|
|
# .gitignore files in the index
|
|
index = index_read(repo)
|
|
|
|
for entry in index.entries:
|
|
if entry.name == ".gitignore" or entry.name.endswith("/.gitignore"):
|
|
dir_name = os.path.dirname(entry.name)
|
|
contents = object_read(repo, entry.sha)
|
|
lines = contents.blobdata.decode("utf8").splitlines()
|
|
ret.scoped[dirname] = gitignore_parse(lines)
|
|
return ret
|
|
|
|
def check_ignore1(rules, path):
|
|
result = None
|
|
for (pattern, value) in rules:
|
|
if fnmatch(path, pattern):
|
|
result = value
|
|
return result
|
|
|
|
def check_ignore_scoped(rules, path):
|
|
parent = os.path.dirname(path)
|
|
while True:
|
|
if parent in rules:
|
|
result = check_ignore1(rules[parent], path)
|
|
if result != None:
|
|
return result
|
|
if parent == "":
|
|
break
|
|
parent = os.path.dirname(parent)
|
|
return None
|
|
|
|
def check_ignore_absolute(rules, path):
|
|
parent = os.path.dirname(path)
|
|
for ruleset in rules:
|
|
result = check_ignore1(ruleset, path)
|
|
if result != None:
|
|
return result
|
|
return False
|
|
|
|
def check_ignore(rules, path):
|
|
if os.path.isabs(path):
|
|
raise Exception("This function requires path to be relative to the repository's root")
|
|
|
|
result = check_ignore_scoped(rules.scoped, path)
|
|
if result != None:
|
|
return result
|
|
|
|
return check_ignore_absolute(rules.absolute, path)
|