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684 lines
22 KiB
Python
684 lines
22 KiB
Python
#!/usr/bin/env python3
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#
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# Docker controlling module
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#
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# Copyright (c) 2016 Red Hat Inc.
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#
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# Authors:
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# Fam Zheng <famz@redhat.com>
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#
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# This work is licensed under the terms of the GNU GPL, version 2
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# or (at your option) any later version. See the COPYING file in
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# the top-level directory.
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import os
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import sys
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import subprocess
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import json
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import hashlib
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import atexit
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import uuid
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import argparse
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import enum
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import tempfile
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import re
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import signal
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from tarfile import TarFile, TarInfo
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from io import StringIO, BytesIO
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from shutil import copy, rmtree
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from pwd import getpwuid
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from datetime import datetime, timedelta
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FILTERED_ENV_NAMES = ['ftp_proxy', 'http_proxy', 'https_proxy']
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DEVNULL = open(os.devnull, 'wb')
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class EngineEnum(enum.IntEnum):
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AUTO = 1
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DOCKER = 2
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PODMAN = 3
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def __str__(self):
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return self.name.lower()
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def __repr__(self):
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return str(self)
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@staticmethod
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def argparse(s):
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try:
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return EngineEnum[s.upper()]
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except KeyError:
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return s
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USE_ENGINE = EngineEnum.AUTO
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def _bytes_checksum(bytes):
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"""Calculate a digest string unique to the text content"""
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return hashlib.sha1(bytes).hexdigest()
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def _text_checksum(text):
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"""Calculate a digest string unique to the text content"""
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return _bytes_checksum(text.encode('utf-8'))
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def _read_dockerfile(path):
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return open(path, 'rt', encoding='utf-8').read()
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def _file_checksum(filename):
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return _bytes_checksum(open(filename, 'rb').read())
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def _guess_engine_command():
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""" Guess a working engine command or raise exception if not found"""
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commands = []
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if USE_ENGINE in [EngineEnum.AUTO, EngineEnum.PODMAN]:
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commands += [["podman"]]
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if USE_ENGINE in [EngineEnum.AUTO, EngineEnum.DOCKER]:
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commands += [["docker"], ["sudo", "-n", "docker"]]
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for cmd in commands:
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try:
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# docker version will return the client details in stdout
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# but still report a status of 1 if it can't contact the daemon
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if subprocess.call(cmd + ["version"],
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stdout=DEVNULL, stderr=DEVNULL) == 0:
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return cmd
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except OSError:
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pass
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commands_txt = "\n".join([" " + " ".join(x) for x in commands])
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raise Exception("Cannot find working engine command. Tried:\n%s" %
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commands_txt)
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def _copy_with_mkdir(src, root_dir, sub_path='.', name=None):
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"""Copy src into root_dir, creating sub_path as needed."""
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dest_dir = os.path.normpath("%s/%s" % (root_dir, sub_path))
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try:
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os.makedirs(dest_dir)
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except OSError:
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# we can safely ignore already created directories
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pass
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dest_file = "%s/%s" % (dest_dir, name if name else os.path.basename(src))
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try:
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copy(src, dest_file)
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except FileNotFoundError:
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print("Couldn't copy %s to %s" % (src, dest_file))
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pass
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def _get_so_libs(executable):
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"""Return a list of libraries associated with an executable.
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The paths may be symbolic links which would need to be resolved to
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ensure the right data is copied."""
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libs = []
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ldd_re = re.compile(r"(?:\S+ => )?(\S*) \(:?0x[0-9a-f]+\)")
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try:
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ldd_output = subprocess.check_output(["ldd", executable]).decode('utf-8')
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for line in ldd_output.split("\n"):
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search = ldd_re.search(line)
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if search:
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try:
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libs.append(search.group(1))
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except IndexError:
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pass
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except subprocess.CalledProcessError:
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print("%s had no associated libraries (static build?)" % (executable))
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return libs
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def _copy_binary_with_libs(src, bin_dest, dest_dir):
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"""Maybe copy a binary and all its dependent libraries.
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If bin_dest isn't set we only copy the support libraries because
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we don't need qemu in the docker path to run (due to persistent
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mapping). Indeed users may get confused if we aren't running what
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is in the image.
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This does rely on the host file-system being fairly multi-arch
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aware so the file don't clash with the guests layout.
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"""
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if bin_dest:
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_copy_with_mkdir(src, dest_dir, os.path.dirname(bin_dest))
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else:
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print("only copying support libraries for %s" % (src))
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libs = _get_so_libs(src)
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if libs:
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for l in libs:
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so_path = os.path.dirname(l)
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name = os.path.basename(l)
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real_l = os.path.realpath(l)
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_copy_with_mkdir(real_l, dest_dir, so_path, name)
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def _check_binfmt_misc(executable):
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"""Check binfmt_misc has entry for executable in the right place.
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The details of setting up binfmt_misc are outside the scope of
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this script but we should at least fail early with a useful
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message if it won't work.
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Returns the configured binfmt path and a valid flag. For
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persistent configurations we will still want to copy and dependent
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libraries.
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"""
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binary = os.path.basename(executable)
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binfmt_entry = "/proc/sys/fs/binfmt_misc/%s" % (binary)
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if not os.path.exists(binfmt_entry):
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print ("No binfmt_misc entry for %s" % (binary))
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return None, False
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with open(binfmt_entry) as x: entry = x.read()
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if re.search("flags:.*F.*\n", entry):
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print("binfmt_misc for %s uses persistent(F) mapping to host binary" %
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(binary))
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return None, True
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m = re.search("interpreter (\S+)\n", entry)
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interp = m.group(1)
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if interp and interp != executable:
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print("binfmt_misc for %s does not point to %s, using %s" %
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(binary, executable, interp))
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return interp, True
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def _read_qemu_dockerfile(img_name):
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# special case for Debian linux-user images
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if img_name.startswith("debian") and img_name.endswith("user"):
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img_name = "debian-bootstrap"
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df = os.path.join(os.path.dirname(__file__), "dockerfiles",
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img_name + ".docker")
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return _read_dockerfile(df)
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def _dockerfile_verify_flat(df):
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"Verify we do not include other qemu/ layers"
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for l in df.splitlines():
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if len(l.strip()) == 0 or l.startswith("#"):
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continue
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from_pref = "FROM qemu/"
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if l.startswith(from_pref):
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print("We no longer support multiple QEMU layers.")
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print("Dockerfiles should be flat, ideally created by lcitool")
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return False
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return True
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class Docker(object):
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""" Running Docker commands """
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def __init__(self):
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self._command = _guess_engine_command()
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if ("docker" in self._command and
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"TRAVIS" not in os.environ and
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"GITLAB_CI" not in os.environ):
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os.environ["DOCKER_BUILDKIT"] = "1"
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self._buildkit = True
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else:
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self._buildkit = False
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self._instance = None
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atexit.register(self._kill_instances)
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signal.signal(signal.SIGTERM, self._kill_instances)
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signal.signal(signal.SIGHUP, self._kill_instances)
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def _do(self, cmd, quiet=True, **kwargs):
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if quiet:
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kwargs["stdout"] = DEVNULL
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return subprocess.call(self._command + cmd, **kwargs)
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def _do_check(self, cmd, quiet=True, **kwargs):
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if quiet:
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kwargs["stdout"] = DEVNULL
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return subprocess.check_call(self._command + cmd, **kwargs)
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def _do_kill_instances(self, only_known, only_active=True):
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cmd = ["ps", "-q"]
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if not only_active:
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cmd.append("-a")
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filter = "--filter=label=com.qemu.instance.uuid"
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if only_known:
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if self._instance:
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filter += "=%s" % (self._instance)
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else:
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# no point trying to kill, we finished
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return
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print("filter=%s" % (filter))
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cmd.append(filter)
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for i in self._output(cmd).split():
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self._do(["rm", "-f", i])
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def clean(self):
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self._do_kill_instances(False, False)
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return 0
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def _kill_instances(self, *args, **kwargs):
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return self._do_kill_instances(True)
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def _output(self, cmd, **kwargs):
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try:
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return subprocess.check_output(self._command + cmd,
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stderr=subprocess.STDOUT,
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encoding='utf-8',
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**kwargs)
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except TypeError:
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# 'encoding' argument was added in 3.6+
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return subprocess.check_output(self._command + cmd,
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stderr=subprocess.STDOUT,
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**kwargs).decode('utf-8')
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def inspect_tag(self, tag):
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try:
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return self._output(["inspect", tag])
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except subprocess.CalledProcessError:
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return None
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def get_image_creation_time(self, info):
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return json.loads(info)[0]["Created"]
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def get_image_dockerfile_checksum(self, tag):
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resp = self.inspect_tag(tag)
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labels = json.loads(resp)[0]["Config"].get("Labels", {})
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return labels.get("com.qemu.dockerfile-checksum", "")
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def build_image(self, tag, docker_dir, dockerfile,
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quiet=True, user=False, argv=None, registry=None,
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extra_files_cksum=[]):
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if argv is None:
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argv = []
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if not _dockerfile_verify_flat(dockerfile):
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return -1
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checksum = _text_checksum(dockerfile)
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tmp_df = tempfile.NamedTemporaryFile(mode="w+t",
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encoding='utf-8',
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dir=docker_dir, suffix=".docker")
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tmp_df.write(dockerfile)
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if user:
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uid = os.getuid()
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uname = getpwuid(uid).pw_name
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tmp_df.write("\n")
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tmp_df.write("RUN id %s 2>/dev/null || useradd -u %d -U %s" %
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(uname, uid, uname))
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tmp_df.write("\n")
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tmp_df.write("LABEL com.qemu.dockerfile-checksum=%s\n" % (checksum))
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for f, c in extra_files_cksum:
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tmp_df.write("LABEL com.qemu.%s-checksum=%s\n" % (f, c))
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tmp_df.flush()
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build_args = ["build", "-t", tag, "-f", tmp_df.name]
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if self._buildkit:
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build_args += ["--build-arg", "BUILDKIT_INLINE_CACHE=1"]
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if registry is not None:
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pull_args = ["pull", "%s/%s" % (registry, tag)]
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self._do(pull_args, quiet=quiet)
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cache = "%s/%s" % (registry, tag)
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build_args += ["--cache-from", cache]
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build_args += argv
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build_args += [docker_dir]
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self._do_check(build_args,
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quiet=quiet)
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def update_image(self, tag, tarball, quiet=True):
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"Update a tagged image using "
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self._do_check(["build", "-t", tag, "-"], quiet=quiet, stdin=tarball)
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def image_matches_dockerfile(self, tag, dockerfile):
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try:
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checksum = self.get_image_dockerfile_checksum(tag)
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except Exception:
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return False
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return checksum == _text_checksum(dockerfile)
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def run(self, cmd, keep, quiet, as_user=False):
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label = uuid.uuid4().hex
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if not keep:
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self._instance = label
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if as_user:
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uid = os.getuid()
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cmd = [ "-u", str(uid) ] + cmd
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# podman requires a bit more fiddling
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if self._command[0] == "podman":
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cmd.insert(0, '--userns=keep-id')
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ret = self._do_check(["run", "--rm", "--label",
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"com.qemu.instance.uuid=" + label] + cmd,
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quiet=quiet)
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if not keep:
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self._instance = None
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return ret
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def command(self, cmd, argv, quiet):
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return self._do([cmd] + argv, quiet=quiet)
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class SubCommand(object):
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"""A SubCommand template base class"""
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name = None # Subcommand name
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def shared_args(self, parser):
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parser.add_argument("--quiet", action="store_true",
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help="Run quietly unless an error occurred")
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def args(self, parser):
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"""Setup argument parser"""
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pass
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def run(self, args, argv):
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"""Run command.
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args: parsed argument by argument parser.
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argv: remaining arguments from sys.argv.
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"""
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pass
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class RunCommand(SubCommand):
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"""Invoke docker run and take care of cleaning up"""
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name = "run"
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def args(self, parser):
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parser.add_argument("--keep", action="store_true",
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help="Don't remove image when command completes")
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parser.add_argument("--run-as-current-user", action="store_true",
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help="Run container using the current user's uid")
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def run(self, args, argv):
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return Docker().run(argv, args.keep, quiet=args.quiet,
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as_user=args.run_as_current_user)
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class BuildCommand(SubCommand):
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""" Build docker image out of a dockerfile. Arg: <tag> <dockerfile>"""
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name = "build"
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def args(self, parser):
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parser.add_argument("--include-executable", "-e",
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help="""Specify a binary that will be copied to the
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container together with all its dependent
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libraries""")
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parser.add_argument("--skip-binfmt",
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action="store_true",
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help="""Skip binfmt entry check (used for testing)""")
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parser.add_argument("--extra-files", nargs='*',
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help="""Specify files that will be copied in the
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Docker image, fulfilling the ADD directive from the
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Dockerfile""")
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parser.add_argument("--add-current-user", "-u", dest="user",
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action="store_true",
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help="Add the current user to image's passwd")
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parser.add_argument("--registry", "-r",
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help="cache from docker registry")
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parser.add_argument("-t", dest="tag",
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help="Image Tag")
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parser.add_argument("-f", dest="dockerfile",
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help="Dockerfile name")
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def run(self, args, argv):
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dockerfile = _read_dockerfile(args.dockerfile)
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tag = args.tag
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dkr = Docker()
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if "--no-cache" not in argv and \
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dkr.image_matches_dockerfile(tag, dockerfile):
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if not args.quiet:
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print("Image is up to date.")
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else:
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# Create a docker context directory for the build
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docker_dir = tempfile.mkdtemp(prefix="docker_build")
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# Validate binfmt_misc will work
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if args.skip_binfmt:
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qpath = args.include_executable
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elif args.include_executable:
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qpath, enabled = _check_binfmt_misc(args.include_executable)
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if not enabled:
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return 1
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# Is there a .pre file to run in the build context?
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docker_pre = os.path.splitext(args.dockerfile)[0]+".pre"
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if os.path.exists(docker_pre):
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stdout = DEVNULL if args.quiet else None
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rc = subprocess.call(os.path.realpath(docker_pre),
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cwd=docker_dir, stdout=stdout)
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if rc == 3:
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print("Skip")
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return 0
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elif rc != 0:
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print("%s exited with code %d" % (docker_pre, rc))
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return 1
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# Copy any extra files into the Docker context. These can be
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# included by the use of the ADD directive in the Dockerfile.
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cksum = []
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if args.include_executable:
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# FIXME: there is no checksum of this executable and the linked
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# libraries, once the image built any change of this executable
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# or any library won't trigger another build.
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_copy_binary_with_libs(args.include_executable,
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qpath, docker_dir)
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for filename in args.extra_files or []:
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_copy_with_mkdir(filename, docker_dir)
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cksum += [(filename, _file_checksum(filename))]
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argv += ["--build-arg=" + k.lower() + "=" + v
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for k, v in os.environ.items()
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if k.lower() in FILTERED_ENV_NAMES]
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dkr.build_image(tag, docker_dir, dockerfile,
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quiet=args.quiet, user=args.user,
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argv=argv, registry=args.registry,
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extra_files_cksum=cksum)
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rmtree(docker_dir)
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return 0
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class FetchCommand(SubCommand):
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""" Fetch a docker image from the registry. Args: <tag> <registry>"""
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name = "fetch"
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def args(self, parser):
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parser.add_argument("tag",
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help="Local tag for image")
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parser.add_argument("registry",
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help="Docker registry")
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def run(self, args, argv):
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dkr = Docker()
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dkr.command(cmd="pull", quiet=args.quiet,
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argv=["%s/%s" % (args.registry, args.tag)])
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dkr.command(cmd="tag", quiet=args.quiet,
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argv=["%s/%s" % (args.registry, args.tag), args.tag])
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class UpdateCommand(SubCommand):
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""" Update a docker image. Args: <tag> <actions>"""
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name = "update"
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def args(self, parser):
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|
parser.add_argument("tag",
|
|
help="Image Tag")
|
|
parser.add_argument("--executable",
|
|
help="Executable to copy")
|
|
parser.add_argument("--add-current-user", "-u", dest="user",
|
|
action="store_true",
|
|
help="Add the current user to image's passwd")
|
|
|
|
def run(self, args, argv):
|
|
# Create a temporary tarball with our whole build context and
|
|
# dockerfile for the update
|
|
tmp = tempfile.NamedTemporaryFile(suffix="dckr.tar.gz")
|
|
tmp_tar = TarFile(fileobj=tmp, mode='w')
|
|
|
|
# Create a Docker buildfile
|
|
df = StringIO()
|
|
df.write(u"FROM %s\n" % args.tag)
|
|
|
|
if args.executable:
|
|
# Add the executable to the tarball, using the current
|
|
# configured binfmt_misc path. If we don't get a path then we
|
|
# only need the support libraries copied
|
|
ff, enabled = _check_binfmt_misc(args.executable)
|
|
|
|
if not enabled:
|
|
print("binfmt_misc not enabled, update disabled")
|
|
return 1
|
|
|
|
if ff:
|
|
tmp_tar.add(args.executable, arcname=ff)
|
|
|
|
# Add any associated libraries
|
|
libs = _get_so_libs(args.executable)
|
|
if libs:
|
|
for l in libs:
|
|
so_path = os.path.dirname(l)
|
|
name = os.path.basename(l)
|
|
real_l = os.path.realpath(l)
|
|
try:
|
|
tmp_tar.add(real_l, arcname="%s/%s" % (so_path, name))
|
|
except FileNotFoundError:
|
|
print("Couldn't add %s/%s to archive" % (so_path, name))
|
|
pass
|
|
|
|
df.write(u"ADD . /\n")
|
|
|
|
if args.user:
|
|
uid = os.getuid()
|
|
uname = getpwuid(uid).pw_name
|
|
df.write("\n")
|
|
df.write("RUN id %s 2>/dev/null || useradd -u %d -U %s" %
|
|
(uname, uid, uname))
|
|
|
|
df_bytes = BytesIO(bytes(df.getvalue(), "UTF-8"))
|
|
|
|
df_tar = TarInfo(name="Dockerfile")
|
|
df_tar.size = df_bytes.getbuffer().nbytes
|
|
tmp_tar.addfile(df_tar, fileobj=df_bytes)
|
|
|
|
tmp_tar.close()
|
|
|
|
# reset the file pointers
|
|
tmp.flush()
|
|
tmp.seek(0)
|
|
|
|
# Run the build with our tarball context
|
|
dkr = Docker()
|
|
dkr.update_image(args.tag, tmp, quiet=args.quiet)
|
|
|
|
return 0
|
|
|
|
|
|
class CleanCommand(SubCommand):
|
|
"""Clean up docker instances"""
|
|
name = "clean"
|
|
|
|
def run(self, args, argv):
|
|
Docker().clean()
|
|
return 0
|
|
|
|
|
|
class ImagesCommand(SubCommand):
|
|
"""Run "docker images" command"""
|
|
name = "images"
|
|
|
|
def run(self, args, argv):
|
|
return Docker().command("images", argv, args.quiet)
|
|
|
|
|
|
class ProbeCommand(SubCommand):
|
|
"""Probe if we can run docker automatically"""
|
|
name = "probe"
|
|
|
|
def run(self, args, argv):
|
|
try:
|
|
docker = Docker()
|
|
if docker._command[0] == "docker":
|
|
print("docker")
|
|
elif docker._command[0] == "sudo":
|
|
print("sudo docker")
|
|
elif docker._command[0] == "podman":
|
|
print("podman")
|
|
except Exception:
|
|
print("no")
|
|
|
|
return
|
|
|
|
|
|
class CcCommand(SubCommand):
|
|
"""Compile sources with cc in images"""
|
|
name = "cc"
|
|
|
|
def args(self, parser):
|
|
parser.add_argument("--image", "-i", required=True,
|
|
help="The docker image in which to run cc")
|
|
parser.add_argument("--cc", default="cc",
|
|
help="The compiler executable to call")
|
|
parser.add_argument("--source-path", "-s", nargs="*", dest="paths",
|
|
help="""Extra paths to (ro) mount into container for
|
|
reading sources""")
|
|
|
|
def run(self, args, argv):
|
|
if argv and argv[0] == "--":
|
|
argv = argv[1:]
|
|
cwd = os.getcwd()
|
|
cmd = ["-w", cwd,
|
|
"-v", "%s:%s:rw" % (cwd, cwd)]
|
|
if args.paths:
|
|
for p in args.paths:
|
|
cmd += ["-v", "%s:%s:ro,z" % (p, p)]
|
|
cmd += [args.image, args.cc]
|
|
cmd += argv
|
|
return Docker().run(cmd, False, quiet=args.quiet,
|
|
as_user=True)
|
|
|
|
|
|
def main():
|
|
global USE_ENGINE
|
|
|
|
parser = argparse.ArgumentParser(description="A Docker helper",
|
|
usage="%s <subcommand> ..." %
|
|
os.path.basename(sys.argv[0]))
|
|
parser.add_argument("--engine", type=EngineEnum.argparse, choices=list(EngineEnum),
|
|
help="specify which container engine to use")
|
|
subparsers = parser.add_subparsers(title="subcommands", help=None)
|
|
for cls in SubCommand.__subclasses__():
|
|
cmd = cls()
|
|
subp = subparsers.add_parser(cmd.name, help=cmd.__doc__)
|
|
cmd.shared_args(subp)
|
|
cmd.args(subp)
|
|
subp.set_defaults(cmdobj=cmd)
|
|
args, argv = parser.parse_known_args()
|
|
if args.engine:
|
|
USE_ENGINE = args.engine
|
|
return args.cmdobj.run(args, argv)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
sys.exit(main())
|