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# -*- coding: utf-8 -*-
# vim:expandtab:autoindent:tabstop=4:shiftwidth=4:filetype=python:textwidth=0:
# License: GPL2 or later see COPYING
# Written by Michael Brown
# Copyright (C) 2007 Michael E Brown <mebrown@michaels-house.net>
# python library imports
import fcntl
import os
import time
# our imports
from mockbuild.trace_decorator import getLog, traceLog
import mockbuild.util
requires_api_version = "1.1"
# plugin entry point
@traceLog()
def init(plugins, conf, buildroot):
RootCache(plugins, conf, buildroot)
class RootCache(object):
"""caches root environment in a tarball"""
@traceLog()
def __init__(self, plugins, conf, buildroot):
self.buildroot = buildroot
self.root_cache_opts = conf
self.config = buildroot.config
self.state = buildroot.state
self.rootSharedCachePath = self.root_cache_opts['dir'] % self.root_cache_opts
self.rootCacheFile = os.path.join(self.rootSharedCachePath, "cache.tar")
self.rootCacheLock = None
self.compressProgram = self.root_cache_opts['compress_program']
if self.compressProgram == 'pigz' and not os.path.exists('/usr/bin/pigz'):
getLog().warning("specified 'pigz' as the root cache compress program but not available; using gzip")
self.compressProgram = 'gzip'
if self.compressProgram:
self.compressArgs = ['--use-compress-program', self.compressProgram]
self.rootCacheFile = self.rootCacheFile + self.root_cache_opts['extension']
else:
self.compressArgs = []
plugins.add_hook("preinit", self._rootCachePreInitHook)
plugins.add_hook("preshell", self._rootCachePreShellHook)
plugins.add_hook("prechroot", self._rootCachePreShellHook)
plugins.add_hook("preyum", self._rootCachePreYumHook)
plugins.add_hook("postinit", self._rootCachePostInitHook)
plugins.add_hook("postshell", self._rootCachePostShellHook)
plugins.add_hook("postchroot", self._rootCachePostShellHook)
plugins.add_hook("postyum", self._rootCachePostShellHook)
self.exclude_dirs = self.root_cache_opts['exclude_dirs']
self.exclude_tar_cmds = ["--exclude=" + item for item in self.exclude_dirs]
# =============
# 'Private' API
# =============
@traceLog()
def _rootCacheLock(self, shared=1):
lockType = fcntl.LOCK_EX
if shared:
lockType = fcntl.LOCK_SH
try:
fcntl.lockf(self.rootCacheLock.fileno(), lockType | fcntl.LOCK_NB)
except IOError:
self.state.start("Waiting for rootcache lock")
fcntl.lockf(self.rootCacheLock.fileno(), lockType)
self.state.finish("Waiting for rootcache lock")
@traceLog()
def _rootCacheUnlock(self):
fcntl.lockf(self.rootCacheLock.fileno(), fcntl.LOCK_UN)
@traceLog()
def _rootCachePreInitHook(self):
getLog().info("enabled root cache")
self._unpack_root_cache()
def _haveVolatileRoot(self):
return self.config['plugin_conf']['tmpfs_enable'] \
and not (str(self.config['plugin_conf']['tmpfs_opts']['keep_mounted'] == 'True'))
@traceLog()
def _unpack_root_cache(self):
# check cache status
try:
if self.root_cache_opts['age_check']:
# see if it aged out
statinfo = os.stat(self.rootCacheFile)
file_age_days = (time.time() - statinfo.st_ctime) / (60 * 60 * 24)
if file_age_days > self.root_cache_opts['max_age_days']:
getLog().info("root cache aged out! cache will be rebuilt")
os.unlink(self.rootCacheFile)
else:
# make sure no config file is newer than the cache file
for cfg in self.config['config_paths']:
if os.stat(cfg).st_mtime > statinfo.st_mtime:
getLog().info("%s newer than root cache; cache will be rebuilt", cfg)
os.unlink(self.rootCacheFile)
break
else:
getLog().info("skipping root_cache aging check")
except OSError:
pass
mockbuild.util.mkdirIfAbsent(self.rootSharedCachePath)
# lock so others dont accidentally use root cache while we operate on it.
if self.rootCacheLock is None:
self.rootCacheLock = open(os.path.join(self.rootSharedCachePath, "rootcache.lock"), "a+")
# optimization: don't unpack root cache if chroot was not cleaned (unless we are using tmpfs)
if os.path.exists(self.rootCacheFile):
if (not self.buildroot.chroot_was_initialized or self._haveVolatileRoot()):
self.state.start("unpacking root cache")
self._rootCacheLock()
# deal with NFS homedir and root_squash
prev_cwd = None
cwd = mockbuild.util.pretty_getcwd()
if mockbuild.util.get_fs_type(cwd).startswith('nfs'):
prev_cwd = os.getcwd()
os.chdir(mockbuild.util.find_non_nfs_dir())
mockbuild.util.mkdirIfAbsent(self.buildroot.make_chroot_path())
mockbuild.util.do(
["tar"] + self.compressArgs + ["-xf", self.rootCacheFile, "-C", self.buildroot.make_chroot_path()],
shell=False, printOutput=True
)
for item in self.exclude_dirs:
mockbuild.util.mkdirIfAbsent(self.buildroot.make_chroot_path(item))
self._rootCacheUnlock()
self.buildroot.chrootWasCached = True
self.state.finish("unpacking root cache")
if prev_cwd:
os.chdir(prev_cwd)
@traceLog()
def _rootCachePreShellHook(self):
if self._haveVolatileRoot():
self._unpack_root_cache()
@traceLog()
def _rootCachePreYumHook(self):
if self._haveVolatileRoot():
if not os.listdir(self.buildroot.make_chroot_path()) or self.config['cache_alterations']:
self._unpack_root_cache()
@traceLog()
def _root_cache_handle_mounts(self):
br_path = self.buildroot.make_chroot_path()
for m in self.buildroot.mounts.get_mountpoints():
if m.startswith('/'):
if m.startswith(br_path):
self.exclude_tar_cmds.append('--exclude=.%s' % m[len(br_path):])
else:
self.exclude_tar_cmds.append('--exclude=.%s' % m)
else:
self.exclude_tar_cmds.append('--exclude=./%s' % m)
@traceLog()
def _rootCachePostInitHook(self):
self._rebuild_root_cache()
@traceLog()
def _rebuild_root_cache(self):
try:
self._rootCacheLock(shared=0)
# nuke any rpmdb tmp files
self.buildroot.nuke_rpm_db()
# truncate the sparse files in /var/log
for logfile in ('/var/log/lastlog', '/var/log/faillog'):
try:
with open(self.buildroot.make_chroot_path(logfile), "w") as f:
f.truncate(0)
except (IOError, OSError):
pass
# never rebuild cache unless it was a clean build, or we are explicitly caching alterations
if not self.buildroot.chroot_was_initialized or self.config['cache_alterations']:
mockbuild.util.do(["sync"], shell=False)
self._root_cache_handle_mounts()
self.state.start("creating root cache")
try:
mockbuild.util.do(
["tar", "--one-file-system", "--exclude-caches", "--exclude-caches-under"] +
self.compressArgs +
["-cf", self.rootCacheFile,
"-C", self.buildroot.make_chroot_path()] +
self.exclude_tar_cmds + ["."],
shell=False
)
except:
if os.path.exists(self.rootCacheFile):
os.remove(self.rootCacheFile)
raise
# now create the cache log file
try:
with open(os.path.join(self.rootSharedCachePath, "cache.log"), "w") as l:
l.write(self.buildroot.yum_init_install_output)
except:
pass
self.state.finish("creating root cache")
finally:
self._rootCacheUnlock()
@traceLog()
def _rootCachePostShellHook(self):
if self._haveVolatileRoot() and self.config['cache_alterations']:
self._rebuild_root_cache()
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