9a068d918f
Extract the code that reports the content of individual partitions into its own function to make it overall more readable.
418 lines
12 KiB
Python
Executable file
418 lines
12 KiB
Python
Executable file
#!/usr/bin/python3
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import argparse
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import contextlib
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import functools
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import glob
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import mimetypes
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import json
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import os
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import subprocess
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import sys
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import tempfile
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import xml.etree.ElementTree
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def run_ostree(*args, _input=None, _check=True, **kwargs):
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args = list(args) + [f'--{k}={v}' for k, v in kwargs.items()]
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print("ostree " + " ".join(args), file=sys.stderr)
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res = subprocess.run(["ostree"] + args,
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encoding="utf-8",
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stdout=subprocess.PIPE,
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input=_input,
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check=_check)
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return res
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@contextlib.contextmanager
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def nbd_connect(image):
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for device in glob.glob("/dev/nbd*"):
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r = subprocess.run(["qemu-nbd", "--connect", device, "--read-only", image], check=False).returncode
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if r == 0:
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try:
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yield device
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finally:
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subprocess.run(["qemu-nbd", "--disconnect", device], check=True, stdout=subprocess.DEVNULL)
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break
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else:
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raise RuntimeError("no free network block device")
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@contextlib.contextmanager
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def mount_at(device, mountpoint, options=[], extra=[]):
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opts = ",".join(["ro"] + options)
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subprocess.run(["mount", "-o", opts] + extra + [device, mountpoint], check=True)
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try:
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yield mountpoint
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finally:
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subprocess.run(["umount", "--lazy", mountpoint], check=True)
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@contextlib.contextmanager
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def mount(device):
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with tempfile.TemporaryDirectory() as mountpoint:
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subprocess.run(["mount", "-o", "ro", device, mountpoint], check=True)
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try:
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yield mountpoint
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finally:
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subprocess.run(["umount", "--lazy", mountpoint], check=True)
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def parse_environment_vars(s):
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r = {}
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for line in s.split("\n"):
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line = line.strip()
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if not line:
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continue
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if line[0] == '#':
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continue
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key, value = line.split("=", 1)
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r[key] = value.strip('"')
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return r
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def parse_unit_files(s, expected_state):
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r = []
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for line in s.split("\n")[1:]:
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try:
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unit, state, *_ = line.split()
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except ValueError:
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pass
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if state != expected_state:
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continue
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r.append(unit)
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# deduplicate and sort
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r = list(set(r))
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r.sort()
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return r
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def subprocess_check_output(argv, parse_fn=None):
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try:
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output = subprocess.check_output(argv, encoding="utf-8")
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except subprocess.CalledProcessError as e:
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sys.stderr.write(f"--- Output from {argv}:\n")
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sys.stderr.write(e.stdout)
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sys.stderr.write("\n--- End of the output\n")
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raise
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return parse_fn(output) if parse_fn else output
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def read_image_format(device):
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qemu = subprocess_check_output(["qemu-img", "info", "--output=json", device], json.loads)
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return qemu["format"]
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def read_partition(device, bootable, typ=None, start=0, size=0):
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blkid = subprocess_check_output(["blkid", "--output", "export", device], parse_environment_vars)
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return {
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"label": blkid.get("LABEL"), # doesn't exist for mbr
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"type": typ,
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"uuid": blkid.get("UUID"),
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"partuuid": blkid.get("PARTUUID"),
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"fstype": blkid.get("TYPE"),
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"bootable": bootable,
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"start": start,
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"size": size
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}
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def read_partition_table(device):
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partitions = []
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info = {"partition-table": None,
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"partition-table-id": None,
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"partitions": partitions}
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try:
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sfdisk = subprocess_check_output(["sfdisk", "--json", device], json.loads)
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except subprocess.CalledProcessError:
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partitions.append(read_partition(device, False))
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return info
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ptable = sfdisk["partitiontable"]
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assert ptable["unit"] == "sectors"
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for p in ptable["partitions"]:
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partitions.append(read_partition(p["node"], p.get("bootable", False), p["type"], p["start"] * 512, p["size"] * 512))
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info["partition-table"] = ptable["label"]
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info["partition-table-id"] = ptable["id"]
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return info
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def read_bootloader_type(device):
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with open(device, "rb") as f:
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if b"GRUB" in f.read(512):
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return "grub"
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else:
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return "unknown"
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def read_boot_entries(boot_dir):
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entries = []
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for conf in glob.glob(f"{boot_dir}/loader/entries/*.conf"):
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with open(conf) as f:
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entries.append(dict(line.strip().split(" ", 1) for line in f))
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return sorted(entries, key=lambda e: e["title"])
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def rpm_verify(tree):
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# cannot use `rpm --root` here, because rpm uses passwd from the host to
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# verify user and group ownership:
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# https://github.com/rpm-software-management/rpm/issues/882
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rpm = subprocess.Popen(["chroot", tree, "rpm", "--verify", "--all"],
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stdout=subprocess.PIPE, encoding="utf-8")
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changed = {}
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missing = []
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for line in rpm.stdout:
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# format description in rpm(8), under `--verify`
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attrs = line[:9]
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if attrs == "missing ":
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missing.append(line[12:].rstrip())
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else:
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changed[line[13:].rstrip()] = attrs
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# ignore return value, because it returns non-zero when it found changes
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rpm.wait()
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return {
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"missing": sorted(missing),
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"changed": changed
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}
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def rpm_packages(tree, is_ostree):
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cmd = ["rpm", "--root", tree, "-qa"]
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if is_ostree:
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cmd += ["--dbpath", "/usr/share/rpm"]
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pkgs = subprocess_check_output(cmd, str.split)
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return list(sorted(pkgs))
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def read_services(tree, state):
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return subprocess_check_output(["systemctl", f"--root={tree}", "list-unit-files"], (lambda s: parse_unit_files(s, state)))
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def read_firewall_zone(tree):
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try:
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with open(f"{tree}/etc/firewalld/firewalld.conf") as f:
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conf = parse_environment_vars(f.read())
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default = conf["DefaultZone"]
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except FileNotFoundError:
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default = "public"
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r = []
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try:
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root = xml.etree.ElementTree.parse(f"{tree}/etc/firewalld/zones/{default}.xml").getroot()
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except FileNotFoundError:
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root = xml.etree.ElementTree.parse(f"{tree}/usr/lib/firewalld/zones/{default}.xml").getroot()
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for element in root.findall("service"):
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r.append(element.get("name"))
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return r
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def append_filesystem(report, tree, *, is_ostree=False):
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if os.path.exists(f"{tree}/etc/os-release"):
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report["packages"] = rpm_packages(tree, is_ostree)
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if not is_ostree:
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report["rpm-verify"] = rpm_verify(tree)
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with open(f"{tree}/etc/os-release") as f:
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report["os-release"] = parse_environment_vars(f.read())
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report["services-enabled"] = read_services(tree, "enabled")
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report["services-disabled"] = read_services(tree, "disabled")
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try:
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with open(f"{tree}/etc/hostname") as f:
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report["hostname"] = f.read().strip()
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except FileNotFoundError:
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pass
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try:
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report["timezone"] = os.path.basename(os.readlink(f"{tree}/etc/localtime"))
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except FileNotFoundError:
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pass
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try:
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report["firewall-enabled"] = read_firewall_zone(tree)
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except FileNotFoundError:
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pass
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try:
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with open(f"{tree}/etc/fstab") as f:
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report["fstab"] = sorted([line.split() for line in f.read().split("\n") if line and not line.startswith("#")])
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except FileNotFoundError:
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pass
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with open(f"{tree}/etc/passwd") as f:
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report["passwd"] = sorted(f.read().strip().split("\n"))
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with open(f"{tree}/etc/group") as f:
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report["groups"] = sorted(f.read().strip().split("\n"))
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if is_ostree:
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with open(f"{tree}/usr/lib/passwd") as f:
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report["passwd-system"] = sorted(f.read().strip().split("\n"))
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with open(f"{tree}/usr/lib/group") as f:
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report["groups-system"] = sorted(f.read().strip().split("\n"))
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if os.path.exists(f"{tree}/boot") and len(os.listdir(f"{tree}/boot")) > 0:
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assert "bootmenu" not in report
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try:
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with open(f"{tree}/boot/grub2/grubenv") as f:
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report["boot-environment"] = parse_environment_vars(f.read())
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except FileNotFoundError:
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pass
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report["bootmenu"] = read_boot_entries(f"{tree}/boot")
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elif len(glob.glob(f"{tree}/vmlinuz-*")) > 0:
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assert "bootmenu" not in report
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with open(f"{tree}/grub2/grubenv") as f:
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report["boot-environment"] = parse_environment_vars(f.read())
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report["bootmenu"] = read_boot_entries(tree)
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elif len(glob.glob(f"{tree}/EFI")):
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print("EFI partition", file=sys.stderr)
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def partition_is_esp(partition):
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return partition["type"] == "C12A7328-F81F-11D2-BA4B-00A0C93EC93B"
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def find_esp(partitions):
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for i, p in enumerate(partitions):
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if partition_is_esp(p):
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return p, i
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return None, 0
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def append_partitions(report, device):
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esp, esp_id = find_esp(report["partitions"])
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n_partitions = len(report["partitions"])
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for n in range(n_partitions):
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if report["partitions"][n]["fstype"]:
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with mount(device + f"p{n + 1}") as tree:
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if esp and os.path.exists(f"{tree}/boot/efi"):
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with mount_at(device + f"p{esp_id + 1}", f"{tree}/boot/efi", options=['umask=077']):
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append_filesystem(report, tree)
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else:
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append_filesystem(report, tree)
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def analyse_image(image):
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subprocess.run(["modprobe", "nbd"], check=True)
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imgfmt = read_image_format(image)
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report = {"image-format": imgfmt}
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with nbd_connect(image) as device:
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report["bootloader"] = read_bootloader_type(device)
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report.update(read_partition_table(device))
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if report["partition-table"]:
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append_partitions(report, device)
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else:
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with mount(device) as tree:
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append_filesystem(report, tree)
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return report
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def append_directory(report, tree):
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if os.path.lexists(f"{tree}/ostree"):
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os.makedirs(f"{tree}/etc", exist_ok=True)
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with mount_at(f"{tree}/usr/etc", f"{tree}/etc", extra=["--bind"]):
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append_filesystem(report, tree, is_ostree=True)
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else:
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append_filesystem(report, tree)
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def append_ostree_repo(report, repo):
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ostree = functools.partial(run_ostree, repo=repo)
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r = ostree("config", "get", "core.mode")
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report["ostree"] = {
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"repo": {
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"core.mode": r.stdout.strip()
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}
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}
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r = ostree("refs")
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refs = r.stdout.strip().split("\n")
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report["ostree"]["refs"] = refs
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resolved = {r: ostree("rev-parse", r).stdout.strip() for r in refs}
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commit = resolved[refs[0]]
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refs = {r: {"inputhash": ostree("show", "--print-metadata-key=rpmostree.inputhash", resolved[r]).stdout.strip("'\n")} for r in refs}
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report["ostree"]["refs"] = refs
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with tempfile.TemporaryDirectory(dir="/var/tmp") as tmpdir:
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tree = os.path.join(tmpdir, "tree")
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ostree("checkout", "--force-copy", commit, tree)
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append_directory(report, tree)
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def analyse_directory(path):
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report = {}
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if os.path.exists(os.path.join(path, "compose.json")):
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report["type"] = "ostree/commit"
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repo = os.path.join(path, "repo")
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append_ostree_repo(report, repo)
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elif os.path.isdir(os.path.join(path, "refs")):
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report["type"] = "ostree/repo"
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append_ostree_repo(report, repo)
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else:
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append_directory(report, path)
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return report
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def is_tarball(path):
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mtype, encoding = mimetypes.guess_type(path)
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return mtype == "application/x-tar"
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def analyse_tarball(path):
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with tempfile.TemporaryDirectory(dir="/var/tmp") as tmpdir:
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tree = os.path.join(tmpdir, "root")
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os.makedirs(tree)
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command = [
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"tar",
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"-x",
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"--auto-compress",
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"-f", path,
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"-C", tree
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]
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subprocess.run(command,
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stdout=sys.stderr,
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check=True)
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return analyse_directory(tree)
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def main():
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parser = argparse.ArgumentParser(description="Inspect an image")
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parser.add_argument("target", help="The file or directory to analyse")
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args = parser.parse_args()
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target = args.target
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if os.path.isdir(target):
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report = analyse_directory(target)
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elif is_tarball(target):
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report = analyse_tarball(target)
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else:
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report = analyse_image(target)
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json.dump(report, sys.stdout, sort_keys=True, indent=2)
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if __name__ == "__main__":
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main()
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