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# -*- python -*-
# -*- coding: utf-8 -*-
# Started 10/05/2011 by Seblu <seblu@seblu.net>
'''
Image stuff
'''
import os
import stat
import time
import json
import ConfigParser
import subprocess
import installsystems.template as istemplate
import installsystems.tools as istools
from installsystems.printer import *
from installsystems.tarball import Tarball
format = "1"
return re.match("\w+", buf) is not None
@staticmethod
def check_image_version(buf):
# check local repository
if istools.pathtype(path) != "file":
raise NotImplementedError("SourceImage must be local")
# main path
parser_path = os.path.join(path, "parser")
setup_path = os.path.join(path, "setup")
if not os.path.exists(d) or not os.path.isdir(d):
os.mkdir(d)
raise Exception("Unable to create directory: %s: %s" % (d, e))
try:
# create description example from template
open(os.path.join(path, "description"), "w").write(istemplate.description)
open(os.path.join(parser_path, "01-parser.py"), "w").write(istemplate.parser)
open(os.path.join(setup_path, "01-setup.py"), "w").write(istemplate.setup)
except Exception as e:
raise Exception("Unable to example file: %s" % e)
try:
# setting rights on files in setup and parser
for dpath in (parser_path, setup_path):
for f in os.listdir(dpath):
except Exception as e:
raise Exception("Unable to set rights on %s: %s" % (pf, e))
# check local repository
if istools.pathtype(path) != "file":
raise NotImplementedError("SourceImage must be local")
self.base_path = path
self.parser_path = os.path.join(path, "parser")
self.setup_path = os.path.join(path, "setup")
self.payload_path = os.path.join(path, "payload")
self.validate_source_files()
self.description = self.parse_description()
# script tarball path
self.image_name = "%s-%s%s" % (self.description["name"],
self.description["version"],
self.extension)
def validate_source_files(self):
'''
Check if we are a valid SourceImage directories
'''
for d in (self.base_path, self.parser_path, self.setup_path, self.payload_path):
if not os.path.exists(d):
raise Exception("Missing directory: %s" % d)
if not os.path.isdir(d):
raise Exception("Not a directory: %s" % d)
if not os.access(d, os.R_OK|os.X_OK):
raise Exception("Unable to access to %s" % d)
if not os.path.exists(os.path.join(self.base_path, "description")):
raise Exception("No description file")
def build(self, overwrite=False):
# check if free to create script tarball
raise Exception("Tarball already exists. Remove it before")
# Create payload files
payloads = self._create_payloads()
# generate a JSON description
jdesc = self.generate_json_description(payloads)
self._create_image(jdesc)
def _create_image(self, description):
'''
Create a script tarball in current directory
'''
# create tarball
arrow("Creating image tarball")
arrowlevel(1)
arrow("Name %s" % self.image_name)
tarball = Tarball.open(self.image_name, mode="w:gz", dereference=True)
raise Exception("Unable to create tarball %s: %s" % (self.image_name, e))
tarball.add_str("description.json", description, tarfile.REGTYPE, 0444)
tarball.add_str("format", self.format, tarfile.REGTYPE, 0444)
tarball.add(self.parser_path, arcname="parser",
# add setup scripts
tarball.add(self.setup_path, arcname="setup",
# closing tarball file
tarball.close()
# build list of payload files
candidates = os.listdir(self.payload_path)
return []
# create payload files
l_l = []
for pay in candidates:
source_path = os.path.join(self.payload_path, pay)
dest_path = "%s-%s-%s%s" % (self.description["name"],
self.description["version"],
pay,
Payload.extension)
source_stat = os.stat(source_path)
isdir = stat.S_ISDIR(source_stat.st_mode)
if isdir:
self._create_payload_tarball(dest_path, source_path)
else:
self._create_payload_file(dest_path, source_path)
# create payload object
payobj = Payload(pay, dest_path, isdir=isdir)
payobj.uid = source_stat.st_uid
payobj.gid = source_stat.st_gid
payobj.mode = stat.S_IMODE(source_stat.st_mode)
payobj.mtime = source_stat.st_mtime
l_l.append(payobj)
def _create_payload_tarball(self, tar_path, data_path):
'''
Create a payload tarball
This is needed by payload directory
'''
# compute dname to set as a base directory
dname = os.path.basename(data_path)
try:
tarball.add(data_path, arcname="/", recursive=True)
tarball.close()
except Exception as e:
raise Exception("Unable to create payload tarball %s: %s" % (tar_path, e))
def _create_payload_file(self, dest, source):
'''
Create a payload file
Only gzipping it
'''
fsource = istools.uopen(source)
# open file not done in GzipFile, to escape writing of filename
# in gzip file. This change md5.
fdest = open(dest, "wb")
fdest = gzip.GzipFile(filename=os.path.basename(source),
fileobj=fdest,
mtime=os.stat(source).st_mtime)
istools.copyfileobj(fsource, fdest)
fsource.close()
fdest.close()
def _tar_scripts_filter(self, tinfo):
'''
Filter files which can be included in scripts tarball
'''
if not re.match("(parser|setup)(/\d+-.*\.py)?$", tinfo.name):
tinfo.uid = tinfo.gid = 0
tinfo.uname = tinfo.gname = "root"
return tinfo
def generate_json_description(self, payloads):
'''
Generate a JSON description file
'''
arrow("Generating JSON description")
arrowlevel(1)
# copy description
desc = self.description.copy()
# timestamp image
desc["payload"] = {}
for payload in payloads:
desc["payload"][payload.name] = payload.info
# serialize
return json.dumps(desc)
def parse_description(self):
'''
Raise an exception is description file is invalid and return vars to include
'''
d = dict()
try:
descpath = os.path.join(self.base_path, "description")
cp = ConfigParser.RawConfigParser()
cp.read(descpath)
for n in ("name","version", "description", "author"):
d[n] = cp.get("image", n)
except Exception as e:
self.base_path = os.path.dirname(self.path)
# tarball are named by md5 and not by real name
self.md5name = md5name
(self.size, self.md5) = istools.copyfileobj(fo, memfile)
memfile.seek(0)
self._tarball = Tarball.open(fileobj=memfile, mode='r:gz')
self._metadata = self.read_metadata()
# build payloads
self.payload = {}
for pname, pval in self._metadata["payload"].items():
if self.md5name:
ppath = os.path.join(self.base_path,
self._metadata["payload"][pname]["md5"])
else:
ppath = os.path.join(self.base_path,
"%s-%s%s" % (self.id, pname, Payload.extension))
self.payload[pname] = Payload(pname, ppath, **pval)
if name in self._metadata:
return self._metadata[name]
raise AttributeError
@property
def id(self):
'''
Return image versionned name / id
'''
return "%s-%s" % (self.name, self.version)
@property
def filename(self):
return "%s%s" % (self.id, self.extension)
img_format = self._tarball.get_str("format")
img_desc = self._tarball.get_str("description.json")
if img_format != self.format:
raise Exception("Invalid tarball image format")
# check image
if self.md5 != istools.md5sum(self.path):
raise Exception("Invalid MD5 of image %s" % self.name)
# check payloads
for pay_name, pay_obj in self.payload.items():
l_scripts = self._tarball.getnames("%s/.*\.py" % directory)
# order matter!
l_scripts.sort()
# run scripts
arrow(os.path.basename(n_scripts))
old_level = arrowlevel(1)
except Exception as e:
raise Exception("Extracting script %s fail: %s" %
o_scripts = compile(s_scripts, n_scripts, "exec")
except Exception as e:
raise Exception("Unable to compile %s fail: %s" %
(n_scripts, e))
# define execution context
gl = {}
for k in kwargs:
gl[k] = kwargs[k]
gl["image"] = self
# execute source code
try:
exec o_scripts in gl
except Exception as e:
raise Exception("Execution script %s fail: %s" %
class Payload(object):
'''
Payload class represents a payload object
'''
extension = ".isdata"
legit_attr = ('isdir', 'md5', 'size', 'uid', 'gid', 'mode', 'mtime')
def __init__(self, name, path, **kwargs):
object.__setattr__(self, "name", name)
object.__setattr__(self, "path", path)
# register legit param
for attr in self.legit_attr:
setattr(self, attr, None)
# set all named param
for kwarg in kwargs:
# do not use hasattr which user getattr and so call md5 checksum...
if kwarg in self.legit_attr:
setattr(self, kwarg, kwargs[kwarg])
def __getattr__(self, name):
# get all value with an understance as if there is no underscore
if hasattr(self, "_%s" % name):
return getattr(self, "_%s" % name)
raise AttributeError
def __setattr__(self, name, value):
# set all value which exists have no underscore, but where undesrcore exists
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if name in self.legit_attr:
object.__setattr__(self, "_%s" % name, value)
else:
object.__setattr__(self, name, value)
def checksummize(self):
'''
Fill missing md5/size about payload
'''
fileobj = istools.uopen(self.path)
size, md5 = istools.copyfileobj(fileobj, None)
if self._size is None:
self._size = size
if self._md5 is None:
self._md5 = md5
@property
def md5(self):
'''
Return md5 of payload
'''
if self._md5 is None:
self.checksummize()
return self._md5
@property
def size(self):
'''
Return size of payload
'''
if self._size is None:
self.checksummize()
return self._size
@property
def uid(self):
'''
Return uid of owner of orginal payload
'''
return self._uid if self._uid is not None else 0
@property
def gid(self):
'''
Return gid of owner of orginal payload
'''
return self._gid if self._gid is not None else 0
@property
def mode(self):
'''
Return mode of orginal payload
'''
if self._mode is not None:
return self._mode
else:
umask = os.umask(0)
os.umask(umask)
return 0666 & ~umask
@property
def mtime(self):
'''
Return last modification time of orginal payload
'''
return self._mtime if self._mtime is not None else time.time()
@property
def info(self):
'''
return a dict of info about current payload
'''
return {"md5": self.md5,
"size": self.size,
"isdir": self.isdir,
"uid": self.uid,
"gid": self.gid,
"mode": self.mode,
"mtime": self.mtime}
def check(self):
'''
Check that path correspond to current md5 and size
'''
if self._size is None or self._md5 is None:
debug("Check is called on payload with nothing to check")
return True
fileobj = istools.uopen(self.path)
size, md5 = istools.copyfileobj(fileobj, None)
if self._size != size:
raise Exception("Invalid size of payload %s" % self.name)
if self._md5 != md5:
raise Exception("Invalid MD5 of payload %s" % self._md5)
def extract(self, dest, force=False, filelist=None):
'''
Extract payload into dest
filelist is a filter of file in tarball
force will overwrite existing file if exists
'''
if self.isdir:
self.extract_tar(dest, force=force, filelist=filelist)
else:
self.extract_file(dest, force=force)
def extract_tar(self, dest, force=False, filelist=None):
'''
Extract a payload which is a tarball.
This is used mainly to extract payload from a directory
'''
# check validity of dest
if os.path.exists(dest):
if not os.path.isdir(dest):
raise Exception("Destination %s is not a directory" % dest)
if not force and len(os.listdir(dest)) > 0:
raise Exception("Directory %s is not empty (need force)" % dest)
else:
os.mkdir(dest)
# try to open payload file
raise Exception("Unable to open payload file %s" % self.path)
# try to open tarball on payload
try:
t = Tarball.open(fileobj=fo, mode="r|gz")
except Exception as e:
members = (None if filelist is None
else [ t.gettarinfo(name) for name in filelist ])
raise Exception("Extracting failed: %s" % e)
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# closing fo
t.close()
fo.close()
def extract_file(self, dest, force=False):
'''
Copy a payload directly to a file
Check md5 on the fly
'''
# if dest is a directory try to create file inside
if os.path.isdir(dest):
dest = os.path.join(dest, self.name)
# check validity of dest
if os.path.exists(dest):
if not os.path.isfile(dest):
raise Exception("Destination %s is not a file" % dest)
if not force:
raise Exception("File %s already exists" % dest)
# opening destination
try:
f_dst = istools.uopen(dest, "wb")
except Exception as e:
raise Exception("Unable to open destination file %s" % dest)
# try to open payload file
try:
f_gsrc = istools.uopen(self.path)
f_src = gzip.GzipFile(fileobj=f_gsrc)
except Exception as e:
raise Exception("Unable to open payload file %s" % self.path)
# launch copy
size, md5 = istools.copyfileobj(f_src, f_dst)
# closing fo
f_dst.close()
f_gsrc.close()
f_src.close()
# settings file orginal rights
istools.chrights(dest, self.uid, self.gid, self.mode, self.mtime)