287 lines
12 KiB
Python
287 lines
12 KiB
Python
#!/usr/bin/env python3
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"""pkgtool - Python package backend for Terminal's native apt/dpkg.
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This avoids a-Shell's shell/tar/ar quirks for package construction and
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extraction. It is used when Python 3 is available (the full a-Shell app has
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it). Native Mach-O payloads are installed but flagged as non-runnable.
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"""
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import io
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import os
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import shutil
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import sys
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import tarfile
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import tempfile
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ROOT = os.environ.get("TERM_ROOT") or os.path.join(os.path.expanduser("~"), "Documents", ".terminal")
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INFO = os.path.join(ROOT, "var", "lib", "dpkg", "info")
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STATUS = os.path.join(ROOT, "var", "lib", "dpkg", "status")
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PACKAGES = os.path.join(ROOT, "repo", "Packages")
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def ar_pack(out_path, members):
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with open(out_path, "wb") as out:
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out.write(b"!<arch>\n")
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for path in members:
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data = open(path, "rb").read()
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name = os.path.basename(path)
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if len(name) > 15:
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raise SystemExit("pkgtool: ar member name too long: " + name)
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header = (
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name.ljust(16) + "0".ljust(12) + "0".ljust(6) + "0".ljust(6)
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+ "100644".ljust(8) + str(len(data)).ljust(10) + "`\n"
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).encode("ascii")
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out.write(header)
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out.write(data)
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if len(data) & 1:
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out.write(b"\n")
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def ar_unpack(archive, dest):
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data = open(archive, "rb").read()
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if not data.startswith(b"!<arch>\n"):
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raise SystemExit("pkgtool: not a Debian ar archive")
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pos = 8
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while pos + 60 <= len(data):
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header = data[pos:pos + 60]
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pos += 60
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name = header[:16].decode("ascii", "ignore").strip().rstrip("/")
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if not name:
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continue
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try:
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size = int(header[48:58].decode("ascii", "ignore").strip() or "0")
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except ValueError:
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size = 0
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body = data[pos:pos + size]
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pos += size + (size & 1)
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if name in (".", ".."):
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continue
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open(os.path.join(dest, name), "wb").write(body)
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def safe_extract(tar_path, dest):
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os.makedirs(dest, exist_ok=True)
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with tarfile.open(tar_path, "r:*") as tar:
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for member in tar.getmembers():
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name = member.name.lstrip("./")
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if not name or name.startswith("/") or ".." in name.split("/"):
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continue
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target = os.path.join(dest, name)
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if member.isdir():
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os.makedirs(target, exist_ok=True)
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elif member.isfile():
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os.makedirs(os.path.dirname(target), exist_ok=True)
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src = tar.extractfile(member)
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if src is None:
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continue
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with open(target, "wb") as out:
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shutil.copyfileobj(src, out)
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os.chmod(target, member.mode & 0o777)
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elif member.issym():
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os.makedirs(os.path.dirname(target), exist_ok=True)
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# Symlinks are installed relative to the package root.
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try:
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os.symlink(member.linkname, target)
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except FileExistsError:
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os.unlink(target)
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os.symlink(member.linkname, target)
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def parse_control(control_path):
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fields = {}
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with open(control_path, "r", errors="replace") as f:
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for line in f:
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if line.startswith(" ") or line.startswith("\t"):
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continue
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if ":" in line:
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k, v = line.split(":", 1)
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fields[k.strip()] = v.strip()
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return fields
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def append_packages(fields, filename):
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os.makedirs(os.path.dirname(PACKAGES), exist_ok=True)
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with open(PACKAGES, "a") as f:
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f.write("Package: %s\n" % fields.get("Package", ""))
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f.write("Version: %s\n" % fields.get("Version", ""))
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f.write("Architecture: %s\n" % fields.get("Architecture", "iphoneos-arm64"))
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f.write("Maintainer: %s\n" % fields.get("Maintainer", "unknown"))
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f.write("Section: %s\n" % fields.get("Section", "plugins"))
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f.write("Priority: %s\n" % fields.get("Priority", "optional"))
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f.write("Filename: pool/%s\n" % os.path.basename(filename))
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f.write("Size: %d\n" % os.path.getsize(filename))
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if fields.get("Depends"):
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f.write("Depends: %s\n" % fields["Depends"])
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f.write("Description: %s\n\n" % fields.get("Description", ""))
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def build(out_path, name, version, arch, payload, depends=""):
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os.makedirs(os.path.dirname(packages_dir()), exist_ok=True)
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tmp = tempfile.mkdtemp(prefix="mkdeb.", dir=os.path.join(ROOT, "tmp"))
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try:
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control_dir = os.path.join(tmp, "DEBIAN")
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os.makedirs(control_dir, exist_ok=True)
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control = (
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"Package: %s\nVersion: %s\nArchitecture: %s\n"
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"Maintainer: %s\nSection: plugins\nPriority: optional\n"
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"Description: %s\n"
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% (name, version, arch,
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os.environ.get("MKDEB_MAINTAINER", "Terminal User <mobile@localhost>"),
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os.environ.get("MKDEB_DESCRIPTION", name + " plugin for Terminal"))
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)
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if depends:
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control += "Depends: %s\n" % depends
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open(os.path.join(control_dir, "control"), "w").write(control)
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payload_debian = os.path.join(payload, "DEBIAN")
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if os.path.isdir(payload_debian):
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for script in ("preinst", "postinst", "prerm", "postrm"):
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src = os.path.join(payload_debian, script)
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if os.path.isfile(src):
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shutil.copy(src, os.path.join(control_dir, script))
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control_tar = os.path.join(tmp, "control.tar.gz")
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with tarfile.open(control_tar, "w:gz") as tar:
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for root, dirs, files in os.walk(control_dir):
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for fn in files:
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full = os.path.join(root, fn)
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arc = os.path.relpath(full, tmp)
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tar.add(full, arcname=arc)
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data_tar = os.path.join(tmp, "data.tar.gz")
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with tarfile.open(data_tar, "w:gz") as tar:
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for root, dirs, files in os.walk(payload):
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dirs[:] = [d for d in dirs if not (root == payload and d == "DEBIAN")]
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for fn in files:
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full = os.path.join(root, fn)
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arc = os.path.relpath(full, payload)
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tar.add(full, arcname="./" + arc)
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open(os.path.join(tmp, "debian-binary"), "w").write("2.0\n")
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ar_pack(out_path, [os.path.join(tmp, "debian-binary"), control_tar, data_tar])
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fields = parse_control(os.path.join(control_dir, "control"))
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append_packages(fields, out_path)
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print(out_path)
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return 0
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finally:
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shutil.rmtree(tmp, ignore_errors=True)
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def packages_dir():
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return os.path.join(ROOT, "repo", "pool")
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def install(deb):
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if not os.path.isfile(deb):
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print("pkgtool: cannot access archive %s" % deb, file=sys.stderr)
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return 1
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os.makedirs(INFO, exist_ok=True)
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os.makedirs(os.path.dirname(STATUS), exist_ok=True)
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tmp = tempfile.mkdtemp(prefix="dpkg.", dir=os.path.join(ROOT, "tmp"))
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try:
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ar_unpack(deb, tmp)
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control_tar = data_tar = None
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for fn in os.listdir(tmp):
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if fn.startswith("control.tar"):
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control_tar = os.path.join(tmp, fn)
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elif fn.startswith("data.tar"):
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data_tar = os.path.join(tmp, fn)
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if not control_tar or not data_tar:
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print("pkgtool: missing control or data archive", file=sys.stderr)
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return 1
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control_dir = os.path.join(tmp, "control")
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safe_extract(control_tar, control_dir)
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control_path = os.path.join(control_dir, "control")
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if not os.path.isfile(control_path):
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control_path = os.path.join(control_dir, "DEBIAN", "control")
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if not os.path.isfile(control_path):
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print("pkgtool: control file not found", file=sys.stderr)
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return 1
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fields = parse_control(control_path)
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pkg = fields.get("Package", "")
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version = fields.get("Version", "")
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arch = fields.get("Architecture", "iphoneos-arm64")
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if not pkg or not version:
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print("pkgtool: invalid control (Package/Version missing)", file=sys.stderr)
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return 1
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if arch not in ("", "all", "iphoneos-arm64", "darwin-arm64", "a-shell"):
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print("pkgtool: architecture '%s' is not native to iOS/Terminal" % arch, file=sys.stderr)
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print("pkgtool: use the shell dpkg --force-architecture only for script packages", file=sys.stderr)
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return 1
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print("Selecting previously unselected package %s." % pkg)
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print("Unpacking %s (%s) ..." % (pkg, version))
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safe_extract(data_tar, ROOT)
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file_list = []
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with tarfile.open(data_tar, "r:*") as tar:
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for member in tar.getmembers():
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name = member.name.lstrip("./")
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if name and not name.startswith("/") and ".." not in name.split("/"):
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file_list.append(name)
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if member.isfile() and any(part in ("bin", "sbin", "libexec") for part in name.split("/")):
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full = os.path.join(ROOT, name)
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try:
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magic = open(full, "rb").read(4)
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except OSError:
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magic = b""
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if magic in (b"\xcf\xfa\xed\xfe", b"\xfe\xed\xfa\xcf"):
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print("pkgtool: note: %s is a native Mach-O binary; a-Shell cannot run it." % name, file=sys.stderr)
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open(os.path.join(INFO, pkg + ".list"), "w").write("\n".join(file_list) + "\n")
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# Maintainer scripts are kept for inspection/removal, but not executed:
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# a-Shell has no fork/exec for arbitrary shell children in the Python
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# backend. Script-only packages should use dpkg's shell path if needed.
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for script in ("preinst", "postinst", "prerm", "postrm"):
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src = os.path.join(control_dir, "DEBIAN", script)
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if not os.path.isfile(src):
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src = os.path.join(control_dir, script)
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if os.path.isfile(src):
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shutil.copy(src, os.path.join(INFO, pkg + "." + script))
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# Replace the package stanza in the status database.
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stanzas = []
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if os.path.isfile(STATUS):
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with open(STATUS, "r", errors="replace") as f:
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current = []
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for line in f:
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if line.strip() == "":
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if current:
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stanzas.append("".join(current))
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current = []
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else:
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current.append(line)
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if current:
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stanzas.append("".join(current))
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kept = [s for s in stanzas if not s.startswith("Package: %s\n" % pkg)]
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kept.append(
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"Package: %s\nStatus: install ok installed\nPriority: %s\nSection: %s\n"
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"Maintainer: %s\nArchitecture: %s\nVersion: %s\nDescription: %s\n\n"
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% (pkg, fields.get("Priority", "optional"), fields.get("Section", "plugins"),
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fields.get("Maintainer", "unknown"), arch, version,
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fields.get("Description", ""))
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)
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open(STATUS, "w").write("\n".join(kept))
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print("Setting up %s (%s) ..." % (pkg, version))
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return 0
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finally:
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shutil.rmtree(tmp, ignore_errors=True)
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def main():
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if len(sys.argv) < 2:
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print(__doc__)
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return 2
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cmd = sys.argv[1]
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if cmd == "build" and len(sys.argv) >= 7:
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return build(sys.argv[2], sys.argv[3], sys.argv[4], sys.argv[5], sys.argv[6],
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sys.argv[7] if len(sys.argv) > 7 else "")
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if cmd == "install" and len(sys.argv) >= 3:
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return install(sys.argv[2])
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print(__doc__)
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return 2
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if __name__ == "__main__":
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raise SystemExit(main())
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