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https://github.com/ish-app/ish.git
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afd119ba1a
Not having / be readable or executable by group and other caused quite a few problems, as you can imagine. In particular, autoconf complained that it couldn't find a sufficiently modern shell.
107 lines
3.1 KiB
Python
Executable File
107 lines
3.1 KiB
Python
Executable File
#!/usr/bin/env python3
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import os
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import sys
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from pathlib import Path
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import struct
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import tarfile
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import sqlite3
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SCHEMA = """
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create table meta (id integer unique default 0, db_inode integer);
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insert into meta (db_inode) values (0);
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create table stats (inode integer primary key, stat blob);
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create table paths (path blob primary key, inode integer references stats(inode));
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create index inode_to_path on paths (inode, path);
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pragma user_version=3;
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"""
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# no index is needed on stats, because the rows are ordered by the primary key
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def extract_member(archive, db, member):
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path = data/(member.name)
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major = member.devmajor
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minor = member.devminor
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rdev = ((minor & 0xfff00) << 12) | (major << 8) | (minor & 0xff)
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mode = member.mode
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if member.isfile():
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mode |= 0o100000
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elif member.isdir():
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mode |= 0o040000
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elif member.issym():
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mode |= 0o120000
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elif member.ischr():
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mode |= 0o020000
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elif member.isblk():
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mode |= 0o060000
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elif member.isfifo():
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mode |= 0o010000
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elif member.islnk():
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pass
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else:
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raise ValueError('unrecognized tar entry type')
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if path == data:
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# Make sure the root has sane permissions. Give everyone at least rx.
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mode |= 0o555
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if path != data and not path.parent.exists():
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parent_member = tarfile.TarInfo(os.path.dirname(member.name))
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parent_member.type = tarfile.DIRTYPE
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parent_member.mode = 0o755
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extract_member(archive, db, parent_member)
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if member.isdir():
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path.mkdir()
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elif member.issym():
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path.write_text(member.linkname)
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elif member.isfile():
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archive.extract(member, data)
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else:
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path.touch()
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def meta_path(path):
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path = path.relative_to(data)
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return b'/' + bytes(path) if path.parts else b''
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cursor = db.cursor()
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if member.islnk():
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# a hard link shares its target's inode
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target_path = data/(member.linkname)
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cursor.execute('select inode from paths where path = ?', (meta_path(target_path),))
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inode, = cursor.fetchone()
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else:
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statblob = memoryview(struct.pack(
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'=iiii',
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mode,
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member.uid,
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member.gid,
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rdev,
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))
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cursor.execute('insert into stats (stat) values (?)', (statblob,))
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inode = cursor.lastrowid
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cursor.execute('insert into paths values (?, ?)', (meta_path(path), inode))
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def extract_archive(archive, db):
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for member in archive.getmembers():
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extract_member(archive, db, member)
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try:
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_, archive_path, fs = sys.argv
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except ValueError:
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print('wrong number of arguments')
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print("Usage: fakefsify.py <rootfs archive> <destination dir>")
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sys.exit(1)
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fs = Path(fs)
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fs.mkdir(parents=True, exist_ok=True)
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data = fs/'data'
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db_path = fs/'meta.db'
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with open(archive_path, 'rb') as archive:
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with tarfile.open(fileobj=archive) as archive:
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db = sqlite3.connect(str(db_path))
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db.executescript(SCHEMA)
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extract_archive(archive, db)
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db.execute('update meta set db_inode = ?', (db_path.stat().st_ino,))
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db.commit()
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