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"""
Download packages from the archive and generate a symbols file for them.
"""
import argparse
import glob
import os
import subprocess
import re
import sys
import urllib.request
import distro_info
import apt_pkg
import apt_inst
import apt.progress.text
STDLIB = (
"^typeinfo for std::"
"|^vtable for std::"
"|^typeinfo name for std::"
"|^guard variable for std::"
"|^std::"
"|^[a-z]* std::"
"|^typeinfo for __gnu_cxx::"
"|^vtable for __gnu_cxx::"
"|^typeinfo name for __gnu_cxx::"
"|^guard variable for __gnu_cxx::"
"|^__gnu_cxx::"
"|^[a-z]* __gnu_cxx::"
)
STDLIB_RE = re.compile(STDLIB)
def get_archs(dist: str) -> set[str]:
if dist in distro_info.UbuntuDistroInfo().all:
url = f"https://snapshot.ubuntu.com/ubuntu/dists/{dist}/InRelease"
else:
url = f"https://deb.debian.org/debian/dists/{dist}/InRelease"
with urllib.request.urlopen(url) as rel:
for line in rel:
line = line.decode("utf-8")
if line.startswith("Architectures:"):
return set(line.split(":")[1].split()) - {"all"}
raise ValueError("Invalid Release file")
def download_debs(dist: str) -> list[str]:
"""Download the debs and return the list of filenames."""
runtime_dir = os.getenv("XDG_RUNTIME_DIR")
if runtime_dir is None:
raise ValueError("Need to set XDG_RUNTIME_DIR")
tmpdir = f"{runtime_dir}/apt/symbol-merger"
os.makedirs(f"{tmpdir}/etc/apt/sources.list.d", exist_ok=True)
os.makedirs(f"{tmpdir}/etc/apt/apt.conf.d", exist_ok=True)
os.makedirs(f"{tmpdir}/etc/apt/trusted.gpg.d", exist_ok=True)
os.makedirs(f"{tmpdir}/var/lib/apt/lists/partial", exist_ok=True)
os.makedirs(f"{tmpdir}/var/cache/apt/archives/partial", exist_ok=True)
if dist in distro_info.UbuntuDistroInfo().all:
url = "https://snapshot.ubuntu.com/ubuntu/"
keyring = "/usr/share/keyrings/ubuntu-archive-keyring.gpg"
suites = f"{dist} {dist}-updates"
else:
url = "https://deb.debian.org/debian/"
keyring = "/usr/share/keyrings/debian-archive-keyring.gpg"
suites = f"{dist}"
with open(f"{tmpdir}/etc/apt/sources.list.d/debian.sources", "w") as sources:
print("Types: deb", file=sources)
print(f"URIs: {url}", file=sources)
print(f"Suites: {suites}", file=sources)
print("Components: main", file=sources)
print(f"Signed-By: {keyring}", file=sources)
print(f"Architectures: {" ".join(archs)}", file=sources)
print("Targets: Packages", file=sources)
print("", file=sources)
apt_pkg.config.set("Dir", tmpdir)
apt_pkg.config.set("Dir::State::status", "/dev/null")
apt_pkg.config.set("APT::List-Cleanup", "false")
apt_pkg.init()
cache = apt_pkg.Cache()
sl = apt_pkg.SourceList()
sl.read_main_list()
cache.update(apt.progress.text.AcquireProgress(), sl, 500000)
cache = apt_pkg.Cache()
depcache = apt_pkg.DepCache(cache)
for arch in archs:
for _, _, ver in cache[("libapt-pkg", arch)].provides_list:
print("Mark", ver.parent_pkg.get_fullname(False), "for", arch, ver.ver_str)
depcache.mark_install(ver.parent_pkg, False)
acq = apt_pkg.Acquire(apt.progress.text.AcquireProgress())
pm = apt_pkg.PackageManager(depcache)
recs = apt_pkg.PackageRecords(cache)
pm.get_archives(acq, sl, recs)
acq.run()
return [itm.destfile for itm in acq.items]
def read_main_symbols() -> dict[str, str]:
"""Read the versions of already known symbols."""
symbols = {}
with open(glob.glob("debian/libapt-pkg*.symbols")[0]) as sf:
for line in sf:
if not line.startswith(" "):
if not symbols:
prelude.append(line.strip())
continue
if line.startswith(" "):
symbol, version = line.strip().rsplit(None, 1)
if '"' in symbol:
print(symbol.strip().split('"'))
prefix="(c++|optional=std)" if "optional=std" in symbol else "(c++)"
symbol = '{}"{}"'.format(prefix, symbol.strip().split('"')[1])
symbols[symbol] = version
# Register the symbol so we keep the ordering later.
print("SYMBOL", symbol)
symbol_archs[symbol] = set()
return symbols
def read_symbol_file(debname: str) -> None:
deb = apt_inst.DebFile(debname)
arch = debname.split("_")[-1].split(".")[0]
symbols = deb.control.extractdata("symbols").decode("utf-8")
decoded_symbols = subprocess.Popen(
["c++filt"], stdin=subprocess.PIPE, stdout=subprocess.PIPE, text=True
).communicate(symbols)[0]
for line, decoded_line in zip(symbols.splitlines(), decoded_symbols.splitlines()):
if not line.startswith(" "):
continue
symbol, version = decoded_line.strip().rsplit(None, 1)
symbol = symbol.strip()
# Our version is higher than the registered one, so lower it again
if line != decoded_line:
if STDLIB_RE.search(symbol):
symbol = '(c++|optional=std)"{}"'.format(symbol)
else:
symbol = '(c++)"{}"'.format(symbol)
if (
symbol not in smallest_symbol_version
or apt_pkg.version_compare(version, smallest_symbol_version[symbol]) < 0
):
smallest_symbol_version[symbol] = version
try:
symbol_archs[symbol].add(arch)
except KeyError:
symbol_archs[symbol] = {arch}
try:
latest_symbol_archs[symbol].add(arch)
except KeyError:
latest_symbol_archs[symbol] = {arch}
def print_merged() -> None:
for line in prelude:
print(line)
for optional in False, True:
if optional:
print("# Optional C++ standard library symbols")
print("# These are inlined libstdc++ symbols and not supposed to be part of our ABI")
print("# but we cannot stop stuff from linking against it, sigh.")
for symbol, line_archs in symbol_archs.items():
if optional != ("optional=std" in symbol):
continue
if archs == line_archs:
print("", symbol, smallest_symbol_version[symbol])
for symbol, line_archs in symbol_archs.items():
if optional != ("optional=std" in symbol):
continue
if archs != line_archs and line_archs:
print_archs = " ".join(sorted(line_archs))
if len(line_archs) > len(archs - line_archs):
print_archs = " ".join("!" + a for a in sorted(archs - line_archs))
if "(c++" in symbol:
print(
"",
symbol.replace("(c++", f"(arch={print_archs}|c++"),
smallest_symbol_version[symbol],
)
else:
print(
f" (arch={print_archs}){symbol} {smallest_symbol_version[symbol]}"
)
if __name__ == "__main__":
parser = argparse.ArgumentParser()
parser.add_argument("dist", nargs="+")
args = parser.parse_args()
prelude: list[str] = []
symbol_archs: dict[str, set[str]] = {}
smallest_symbol_version: dict[str, str] = read_main_symbols()
for dist in args.dist:
latest_symbol_archs: dict[str, set[str]] = {}
archs = get_archs(dist)
for deb in download_debs(dist):
read_symbol_file(deb)
# Clean up removed symbols
for symbol in list(symbol_archs):
if symbol not in latest_symbol_archs:
del symbol_archs[symbol]
else:
symbol_archs[symbol] = latest_symbol_archs[symbol]
with open(glob.glob("debian/libapt-pkg*.symbols")[0], "w") as sys.stdout:
print_merged()
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