pungi/src/pypungi/util.py

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#!/usr/bin/python -tt
# 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; version 2 of the License.
#
# 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 Library General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
import subprocess
import os
import shutil
2008-06-13 17:48:09 +00:00
import sys
import hashlib
def _doRunCommand(command, logger, rundir='/tmp', output=subprocess.PIPE, error=subprocess.PIPE, env=None):
"""Run a command and log the output. Error out if we get something on stderr"""
logger.info("Running %s" % subprocess.list2cmdline(command))
p1 = subprocess.Popen(command, cwd=rundir, stdout=output, stderr=error, universal_newlines=True, env=env)
(out, err) = p1.communicate()
if out:
logger.debug(out)
if p1.returncode != 0:
logger.error("Got an error from %s" % command[0])
logger.error(err)
raise OSError, "Got an error from %s: %s" % (command[0], err)
def _link(local, target, logger, force=False):
"""Simple function to link or copy a package, removing target optionally."""
if os.path.exists(target) and force:
os.remove(target)
#check for broken links
if force and os.path.islink(target):
if not os.path.exists(os.readlink(target)):
os.remove(target)
try:
os.link(local, target)
except OSError, e:
if e.errno != 18: # EXDEV
logger.error('Got an error linking from cache: %s' % e)
raise OSError, e
# Can't hardlink cross file systems
shutil.copy2(local, target)
def _ensuredir(target, logger, force=False, clean=False):
"""Ensure that a directory exists, if it already exists, only continue
if force is set."""
# We have to check existance of a logger, as setting the logger could
# itself cause an issue.
def whoops(func, path, exc_info):
message = 'Could not remove %s' % path
if logger:
logger.error(message)
else:
sys.stderr(message)
sys.exit(1)
if os.path.exists(target) and not os.path.isdir(target):
message = '%s exists but is not a directory.' % target
if logger:
logger.error(message)
else:
sys.stderr(message)
sys.exit(1)
if not os.path.isdir(target):
os.makedirs(target)
elif force and clean:
shutil.rmtree(target, onerror=whoops)
os.makedirs(target)
elif force:
return
else:
message = 'Directory %s already exists. Use --force to overwrite.' % target
if logger:
logger.error(message)
else:
sys.stderr(message)
sys.exit(1)
def _doCheckSum(path, hash, logger):
"""Generate a checksum hash from a provided path.
Return a string of type:hash"""
# Try to figure out what hash we want to do
try:
sum = hashlib.new(hash)
except ValueError:
logger.error("Invalid hash type: %s" % hash)
return False
# Try to open the file, using binary flag.
try:
myfile = open(path, 'rb')
except IOError, e:
logger.error("Could not open file %s: %s" % (path, e))
return False
# Loop through the file reading chunks at a time as to not
# put the entire file in memory. That would suck for DVDs
while True:
chunk = myfile.read(8192) # magic number! Taking suggestions for better blocksize
if not chunk:
break # we're done with the file
sum.update(chunk)
myfile.close()
return '%s:%s' % (hash, sum.hexdigest())