Change the way the buildroot is mounted.

[pakfire.git] / pakfire / builder.py

#!/usr/bin/python
###############################################################################
#                                                                             #
# Pakfire - The IPFire package management system                              #
# Copyright (C) 2011 Pakfire development team                                 #
#                                                                             #
# This program is free software: you can redistribute it and/or modify        #
# it under the terms of the GNU General Public License as published by        #
# the Free Software Foundation, either version 3 of the License, or           #
# (at your option) any later version.                                         #
#                                                                             #
# This program is distributed in the hope that it will be useful,             #
# but WITHOUT ANY WARRANTY; without even the implied warranty of              #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
# GNU General Public License for more details.                                #
#                                                                             #
# You should have received a copy of the GNU General Public License           #
# along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
#                                                                             #
###############################################################################

import fcntl
import grp
import logging
import math
import os
import re
import shutil
import socket
import stat
import time
import uuid

import base
import chroot
import logger
import packages
import packages.packager
import repository
import util

from constants import *
from i18n import _
from errors import BuildError, BuildRootLocked, Error


BUILD_LOG_HEADER = """
 ____       _     __ _            _           _ _     _
|  _ \ __ _| | __/ _(_)_ __ ___  | |__  _   _(_) | __| | ___ _ __
| |_) / _` | |/ / |_| | '__/ _ \ | '_ \| | | | | |/ _` |/ _ \ '__|
|  __/ (_| |   <|  _| | | |  __/ | |_) | |_| | | | (_| |  __/ |
|_|   \__,_|_|\_\_| |_|_|  \___| |_.__/ \__,_|_|_|\__,_|\___|_|

	Time    : %(time)s
	Host    : %(host)s
	Version : %(version)s

"""

class BuildEnviron(object):
	# The version of the kernel this machine is running.
	kernel_version = os.uname()[2]

	def __init__(self, pkg=None, distro_config=None, build_id=None, logfile=None,
			builder_mode="release", **pakfire_args):
		# Set mode.
		assert builder_mode in ("development", "release",)
		self.mode = builder_mode

		# Disable the build repository in release mode.
		if self.mode == "release":
			if pakfire_args.has_key("disable_repos") and pakfire_args["disable_repos"]:
				pakfire_args["disable_repos"] += ["build",]
			else:
				pakfire_args["disable_repos"] = ["build",]

		# Save the build id and generate one if no build id was provided.
		if not build_id:
			build_id = "%s" % uuid.uuid4()

		self.build_id = build_id

		# Setup the logging.
		if logfile:
			self.log = logging.getLogger(self.build_id)
			# Propage everything to the root logger that we will see something
			# on the terminal.
			self.log.propagate = 1
			self.log.setLevel(logging.INFO)

			# Add the given logfile to the logger.
			h = logging.FileHandler(logfile)
			self.log.addHandler(h)

			# Format the log output for the file.
			f = logger.BuildFormatter()
			h.setFormatter(f)
		else:
			# If no logile was given, we use the root logger.
			self.log = logging.getLogger()

		# Log information about pakfire and some more information, when we
		# are running in release mode.
		if self.mode == "release":
			logdata = {
				"host"    : socket.gethostname(),
				"time"    : time.strftime("%a, %d %b %Y %H:%M:%S +0000", time.gmtime()),
				"version" : "Pakfire %s" % PAKFIRE_VERSION,
			}

			for line in BUILD_LOG_HEADER.splitlines():
				self.log.info(line % logdata)

		# Create pakfire instance.
		if pakfire_args.has_key("mode"):
			del pakfire_args["mode"]
		self.pakfire = base.Pakfire(mode="builder", distro_config=distro_config, **pakfire_args)
		self.distro = self.pakfire.distro
		self.path = self.pakfire.path

		# Log the package information.
		self.pkg = packages.Makefile(self.pakfire, pkg)
		self.log.info(_("Package information:"))
		for line in self.pkg.dump(long=True).splitlines():
			self.log.info("  %s" % line)
		self.log.info("")

		# XXX need to make this configureable
		self.settings = {
			"enable_loop_devices" : True,
			"enable_ccache"   : True,
			"enable_icecream" : False,
		}
		#self.settings.update(settings)

		self.buildroot = "/buildroot"

		# Lock the buildroot
		self._lock = None
		self.lock()

		# Save the build time.
		self.build_time = int(time.time())

	def start(self):
		# Mount the directories.
		self._mountall()

		# Create all devnodes and other dirs we need.
		self.prepare()

		# Extract all needed packages.
		self.extract()

	def stop(self):
		# Kill all still running processes.
		util.orphans_kill(self.path)

		# Close pakfire instance.
		del self.pakfire

		# Umount the build environment.
		self._umountall()

		# Remove all files.
		self.destroy()

	@property
	def arch(self):
		"""
			Inherit architecture from distribution configuration.
		"""
		return self.distro.arch

	@property
	def info(self):
		return {
			"build_date" : time.strftime("%a, %d %b %Y %H:%M:%S +0000", time.gmtime(self.build_time)),
			"build_host" : socket.gethostname(),
			"build_id"   : self.build_id,
			"build_time" : self.build_time,
		}

	def lock(self):
		filename = os.path.join(self.path, ".lock")

		try:
			self._lock = open(filename, "a+")
		except IOError, e:
			return 0

		try:
			fcntl.lockf(self._lock.fileno(), fcntl.LOCK_EX | fcntl.LOCK_NB)
		except IOError, e:
			raise BuildRootLocked, "Buildroot is locked"

		return 1

	def unlock(self):
		if self._lock:
			self._lock.close()
			self._lock = None

	def copyin(self, file_out, file_in):
		if file_in.startswith("/"):
			file_in = file_in[1:]

		file_in = self.chrootPath(file_in)

		#if not os.path.exists(file_out):
		#	return

		dir_in = os.path.dirname(file_in)
		if not os.path.exists(dir_in):
			os.makedirs(dir_in)

		logging.debug("%s --> %s" % (file_out, file_in))

		shutil.copy2(file_out, file_in)

	def copyout(self, file_in, file_out):
		if file_in.startswith("/"):
			file_in = file_in[1:]

		file_in = self.chrootPath(file_in)

		#if not os.path.exists(file_in):
		#	return

		dir_out = os.path.dirname(file_out)
		if not os.path.exists(dir_out):
			os.makedirs(dir_out)

		logging.debug("%s --> %s" % (file_in, file_out))

		shutil.copy2(file_in, file_out)

	def copy_result(self, resultdir):
		dir_in = self.chrootPath("result")

		for dir, subdirs, files in os.walk(dir_in):
			basename = os.path.basename(dir)
			dir = dir[len(self.chrootPath()):]
			for file in files:
				file_in = os.path.join(dir, file)

				file_out = os.path.join(
					resultdir,
					basename,
					file,
				)

				self.copyout(file_in, file_out)

	def extract(self, requires=None, build_deps=True):
		"""
			Gets a dependency set and extracts all packages
			to the environment.
		"""
		if not requires:
			requires = []

		# Add neccessary build dependencies.
		requires += BUILD_PACKAGES

		# If we have ccache enabled, we need to extract it
		# to the build chroot.
		if self.settings.get("enable_ccache"):
			requires.append("ccache")

		# If we have icecream enabled, we need to extract it
		# to the build chroot.
		if self.settings.get("enable_icecream"):
			requires.append("icecream")

		# Get build dependencies from source package.
		for req in self.pkg.requires:
			requires.append(req)

		# Install all packages.
		self.install(requires)

		# Copy the makefile and load source tarballs.
		self.pkg.extract(_("Extracting"),
			prefix=os.path.join(self.path, "build"))

	def install(self, requires):
		"""
			Install everything that is required in requires.
		"""
		# If we got nothing to do, we quit immediately.
		if not requires:
			return

		self.pakfire.install(requires, interactive=False,
			allow_downgrade=True, logger=self.log)

	def install_test(self):
		pkgs = []
		for dir, subdirs, files in os.walk(self.chrootPath("result")):
			for file in files:
				pkgs.append(os.path.join(dir, file))

		self.pakfire.localinstall(pkgs, yes=True)

	def chrootPath(self, *args):
		# Remove all leading slashes
		_args = []
		for arg in args:
			if arg.startswith("/"):
				arg = arg[1:]
			_args.append(arg)
		args = _args

		ret = os.path.join(self.path, *args)
		ret = ret.replace("//", "/")

		assert ret.startswith(self.path)

		return ret

	def prepare(self):
		prepared_tag = ".prepared"

		if os.path.exists(self.chrootPath(prepared_tag)):
			return

		# Create directory.
		if not os.path.exists(self.path):
			os.makedirs(self.path)

		# Create important directories.
		dirs = [
			"build",
			self.buildroot,
			"dev",
			"dev/pts",
			"dev/shm",
			"etc",
			"proc",
			"result",
			"sys",
			"tmp",
			"usr/src",
		]

		# Create cache dir if ccache is enabled.
		if self.settings.get("enable_ccache"):
			dirs.append("var/cache/ccache")

			if not os.path.exists(CCACHE_CACHE_DIR):
				os.makedirs(CCACHE_CACHE_DIR)

		for dir in dirs:
			dir = self.chrootPath(dir)
			if not os.path.exists(dir):
				os.makedirs(dir)

		# Create neccessary files like /etc/fstab and /etc/mtab.
		files = (
			"etc/fstab",
			"etc/mtab",
			prepared_tag,
		)

		for file in files:
			file = self.chrootPath(file)
			dir = os.path.dirname(file)
			if not os.path.exists(dir):
				os.makedirs(dir)
			f = open(file, "w")
			f.close()

		self._prepare_dev()
		self._prepare_dns()

	def _prepare_dev(self):
		prevMask = os.umask(0000)

		nodes = [
			("dev/null",	stat.S_IFCHR | 0666, os.makedev(1, 3)),
			("dev/full",	stat.S_IFCHR | 0666, os.makedev(1, 7)),
			("dev/zero",	stat.S_IFCHR | 0666, os.makedev(1, 5)),
			("dev/random",	stat.S_IFCHR | 0666, os.makedev(1, 8)),
			("dev/urandom",	stat.S_IFCHR | 0444, os.makedev(1, 9)),
			("dev/tty",		stat.S_IFCHR | 0666, os.makedev(5, 0)),
			("dev/console",	stat.S_IFCHR | 0600, os.makedev(5, 1)),
		]

		# If we need loop devices (which are optional) we create them here.
		if self.settings["enable_loop_devices"]:
			for i in range(0, 7):
				nodes.append(("dev/loop%d" % i, stat.S_IFBLK | 0660, os.makedev(7, i)))

		# Create all the nodes.
		for node in nodes:
			self._create_node(*node)

		os.symlink("/proc/self/fd/0", self.chrootPath("dev", "stdin"))
		os.symlink("/proc/self/fd/1", self.chrootPath("dev", "stdout"))
		os.symlink("/proc/self/fd/2", self.chrootPath("dev", "stderr"))
		os.symlink("/proc/self/fd",   self.chrootPath("dev", "fd"))

		# make device node for el4 and el5
		if self.kernel_version < "2.6.19":
			self._make_node("dev/ptmx", stat.S_IFCHR | 0666, os.makedev(5, 2))
		else:
			os.symlink("/dev/pts/ptmx", self.chrootPath("dev", "ptmx"))

		os.umask(prevMask)

	def _prepare_dns(self):
		"""
			Add DNS resolution facility to chroot environment by copying
			/etc/resolv.conf and /etc/hosts.
		"""
		for i in ("/etc/resolv.conf", "/etc/hosts"):
			self.copyin(i, i)

	def _create_node(self, filename, mode, device):
		logging.debug("Create node: %s (%s)" % (filename, mode))

		filename = self.chrootPath(filename)

		# Create parent directory if it is missing.
		dirname = os.path.dirname(filename)
		if not os.path.exists(dirname):
			os.makedirs(dirname)

		os.mknod(filename, mode, device)

	def destroy(self):
		logging.debug("Destroying environment %s" % self.path)

		if os.path.exists(self.path):
			util.rm(self.path)

	def cleanup(self):
		logging.debug("Cleaning environemnt.")

		# Remove the build directory and buildroot.
		dirs = ("build", self.buildroot, "result")

		for d in dirs:
			d = self.chrootPath(d)
			if not os.path.exists(d):
				continue

			util.rm(d)
			os.makedirs(d)

	def _mountall(self):
		self.log.debug("Mounting environment")
		for src, dest, fs, options in self.mountpoints:
			mountpoint = self.chrootPath(dest)
			if options:
				options = "-o %s" % options

			# Eventually create mountpoint directory
			if not os.path.exists(mountpoint):
				os.makedirs(mountpoint)

			cmd = "mount -n -t %s %s %s %s" % \
				(fs, options, src, mountpoint)
			chroot.do(cmd, shell=True)

	def _umountall(self):
		self.log.debug("Umounting environment")

		mountpoints = []
		for src, dest, fs, options in reversed(self.mountpoints):
			if not dest in mountpoints:
				mountpoints.append(dest)

		for dest in mountpoints:
			mountpoint = self.chrootPath(dest)

			chroot.do("umount -n %s" % mountpoint, raiseExc=0, shell=True)

	@property
	def mountpoints(self):
		mountpoints = []

		# Make root as a tmpfs.
		#mountpoints += [
		#	("pakfire_root", "/", "tmpfs", "defaults"),
		#]

		mountpoints += [
			# src, dest, fs, options
			("pakfire_proc",  "/proc",     "proc",  "nosuid,noexec,nodev"),
			("/proc/sys",     "/proc/sys", "bind",  "bind"),
			("/proc/sys",     "/proc/sys", "bind",  "bind,ro,remount"),
			("/sys",          "/sys",      "bind",  "bind"),
			("/sys",          "/sys",      "bind",  "bind,ro,remount"),
			("pakfire_tmpfs", "/dev",      "tmpfs", "mode=755,nosuid"),
			("/dev/pts",      "/dev/pts",  "bind",  "bind"),
			("pakfire_tmpfs", "/run",      "tmpfs", "mode=755,nosuid,nodev"),
		]

		# If selinux is enabled.
		if os.path.exists("/sys/fs/selinux"):
			mountpoints += [
				("/sys/fs/selinux", "/sys/fs/selinux", "bind", "bind"),
				("/sys/fs/selinux", "/sys/fs/selinux", "bind", "bind,ro,remount"),
			]

		# If ccache support is requested, we bind mount the cache.
		if self.settings.get("enable_ccache"):
			mountpoints += [
				(CCACHE_CACHE_DIR, "/var/cache/ccache", "bind", "bind"),
			]

		return mountpoints

	@property
	def environ(self):
		env = {
			# Add HOME manually, because it is occasionally not set
			# and some builds get in trouble then.
			"HOME" : "/root",
			"TERM" : os.environ.get("TERM", "dumb"),
			"PS1"  : "\u:\w\$ ",

			"BUILDROOT" : self.buildroot,
			"PARALLELISMFLAGS" : "-j%s" % util.calc_parallelism(),
		}

		# Inherit environment from distro
		env.update(self.pakfire.distro.environ)

		# Icecream environment settings
		if self.settings.get("enable_icecream", False):
			# Set the toolchain path
			if self.settings.get("icecream_toolchain", None):
				env["ICECC_VERSION"] = self.settings.get("icecream_toolchain")

			# Set preferred host if configured.
			if self.settings.get("icecream_preferred_host", None):
				env["ICECC_PREFERRED_HOST"] = \
					self.settings.get("icecream_preferred_host")

		# XXX what do we need else?

		return env

	def do(self, command, shell=True, personality=None, logger=None, *args, **kwargs):
		ret = None

		# Environment variables
		env = self.environ

		if kwargs.has_key("env"):
			env.update(kwargs.pop("env"))

		logging.debug("Environment:")
		for k, v in sorted(env.items()):
			logging.debug("  %s=%s" % (k, v))

		# Update personality it none was set
		if not personality:
			personality = self.distro.personality

		# Make every shell to a login shell because we set a lot of
		# environment things there.
		if shell:
			command = ["bash", "--login", "-c", command]

		if not kwargs.has_key("chrootPath"):
			kwargs["chrootPath"] = self.chrootPath()

		ret = chroot.do(
			command,
			personality=personality,
			shell=False,
			env=env,
			logger=logger,
			*args,
			**kwargs
		)

		return ret

	def build(self, install_test=True):
		assert self.pkg

		pkgfile = os.path.join("/build", os.path.basename(self.pkg.filename))
		resultdir = self.chrootPath("/result")

		# Create the build command, that is executed in the chroot.
		build_command = ["/usr/lib/pakfire/builder", "--offline", "build", pkgfile,
			"--nodeps", "--resultdir=/result",]

		try:
			self.do(" ".join(build_command), logger=self.log)

		except Error:
			raise BuildError, _("The build command failed. See logfile for details.")

		# Perform install test.
		if install_test:
			self.install_test()

		# Copy the final packages and stuff.
		# XXX TODO resultdir

	def shell(self, args=[]):
		if not util.cli_is_interactive():
			logging.warning("Cannot run shell on non-interactive console.")
			return

		# Install all packages that are needed to run a shell.
		self.install(SHELL_PACKAGES)

		# XXX need to set CFLAGS here
		command = "/usr/sbin/chroot %s /usr/bin/chroot-shell %s" % \
			(self.chrootPath(), " ".join(args))

		# Add personality if we require one
		if self.pakfire.distro.personality:
			command = "%s %s" % (self.pakfire.distro.personality, command)

		for key, val in self.environ.items():
			command = "%s=\"%s\" " % (key, val) + command

		# Empty the environment
		command = "env -i - %s" % command

		logging.debug("Shell command: %s" % command)

		shell = os.system(command)
		return os.WEXITSTATUS(shell)


class Builder(object):
	def __init__(self, pakfire, filename, resultdir, **kwargs):
		self.pakfire = pakfire

		self.filename = filename

		self.resultdir = resultdir

		# Open package file.
		self.pkg = packages.Makefile(self.pakfire, self.filename)

		#self.buildroot = "/tmp/pakfire_buildroot/%s" % util.random_string(20)
		self.buildroot = "/buildroot"

		self._environ = {
			"BUILDROOT" : self.buildroot,
			"LANG"      : "C",
		}

	@property
	def distro(self):
		return self.pakfire.distro

	@property
	def environ(self):
		environ = os.environ

		# Get all definitions from the package.
		environ.update(self.pkg.exports)

		# Overwrite some definitions by default values.
		environ.update(self._environ)

		return environ

	def do(self, command, shell=True, personality=None, cwd=None, *args, **kwargs):
		# Environment variables
		logging.debug("Environment:")
		for k, v in sorted(self.environ.items()):
			logging.debug("  %s=%s" % (k, v))

		# Update personality it none was set
		if not personality:
			personality = self.distro.personality

		if not cwd:
			cwd = "/%s" % LOCAL_TMP_PATH

		# Make every shell to a login shell because we set a lot of
		# environment things there.
		if shell:
			command = ["bash", "--login", "-c", command]

		return chroot.do(
			command,
			personality=personality,
			shell=False,
			env=self.environ,
			logger=logging.getLogger(),
			cwd=cwd,
			*args,
			**kwargs
		)

	def create_icecream_toolchain(self):
		try:
			out = self.do("icecc --build-native 2>/dev/null", returnOutput=True)
		except Error:
			return

		for line in out.splitlines():
			m = re.match(r"^creating ([a-z0-9]+\.tar\.gz)", line)
			if m:
				self._environ["icecream_toolchain"] = "/%s" % m.group(1)

	def create_buildscript(self, stage):
		file = "/tmp/build_%s" % util.random_string()

		# Get buildscript from the package.
		script = self.pkg.get_buildscript(stage)

		# Write script to an empty file.
		f = open(file, "w")
		f.write("#!/bin/sh\n\n")
		f.write("set -e\n")
		f.write("set -x\n")
		f.write("\n%s\n" % script)
		f.write("exit 0\n")
		f.close()
		os.chmod(file, 700)

		return file

	def build(self):
		# Create buildroot.
		if not os.path.exists(self.buildroot):
			os.makedirs(self.buildroot)

		# Build icecream toolchain if icecream is installed.
		self.create_icecream_toolchain()

		for stage in ("prepare", "build", "test", "install"):
			self.build_stage(stage)

		# Package the result.
		# Make all these little package from the build environment.
		logging.info(_("Creating packages:"))
		pkgs = []
		for pkg in reversed(self.pkg.packages):
			packager = packages.packager.BinaryPackager(self.pakfire, pkg,
				self, self.buildroot)
			pkg = packager.run(self.resultdir)
			pkgs.append(pkg)
		logging.info("")

		for pkg in sorted(pkgs):
			for line in pkg.dump(long=True).splitlines():
				logging.info(line)
			logging.info("")
		logging.info("")

	def build_stage(self, stage):
		# Get the buildscript for this stage.
		buildscript = self.create_buildscript(stage)

		# Execute the buildscript of this stage.
		logging.info(_("Running stage %s:") % stage)

		try:
			self.do(buildscript, shell=False)

		finally:
			# Remove the buildscript.
			if os.path.exists(buildscript):
				os.unlink(buildscript)

	def cleanup(self):
		if os.path.exists(self.buildroot):
			util.rm(self.buildroot)