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# Python helper script to query for the packages that have
# pending updates. Called by the yum package provider
#
# (C) 2007 Red Hat Inc.
# David Lutterkort <dlutter @redhat.com>
import sys
import string
import re
# this maintains compatibility with really old platforms with python 1.x
from os import popen, WEXITSTATUS
# Try to use the yum libraries by default, but shell out to the yum executable
# if they are not present (i.e. yum <= 2.0). This is only required for RHEL3
# and earlier that do not support later versions of Yum. Once RHEL3 is EOL,
# shell_out() and related code can be removed.
try:
import yum
except ImportError:
useyumlib = 0
else:
useyumlib = 1
OVERRIDE_OPTS = {
'debuglevel': 0,
'errorlevel': 0,
'logfile': '/dev/null'
}
def pkg_lists(my):
my.doConfigSetup()
for k in OVERRIDE_OPTS.keys():
if hasattr(my.conf, k):
setattr(my.conf, k, OVERRIDE_OPTS[k])
else:
my.conf.setConfigOption(k, OVERRIDE_OPTS[k])
my.doTsSetup()
my.doRpmDBSetup()
# Yum 2.2/2.3 python libraries require a couple of extra function calls to setup package sacks.
# They also don't have a __version__ attribute
try:
yumver = yum.__version__
except AttributeError:
my.doRepoSetup()
my.doSackSetup()
return my.doPackageLists('updates')
def shell_out():
try:
p = popen("/usr/bin/env yum check-update 2>&1")
output = p.readlines()
rc = p.close()
if rc is not None:
# None represents exit code of 0, otherwise the exit code is in the
# format returned by wait(). Exit code of 100 from yum represents
# updates available.
if WEXITSTATUS(rc) != 100:
return WEXITSTATUS(rc)
else:
# Exit code is None (0), no updates waiting so don't both parsing output
return 0
# Yum prints a line of hyphens (old versions) or a blank line between
# headers and package data, so skip everything before them
skipheaders = 0
for line in output:
if not skipheaders:
if re.compile("^((-){80}|)$").search(line):
skipheaders = 1
continue
# Skip any blank lines
if re.compile("^[ \t]*$").search(line):
continue
# Format is:
# Yum 1.x: name arch (epoch:)?version
# Yum 2.0: name arch (epoch:)?version repo
# epoch is optional if 0
p = string.split(line)
pname = p[0]
parch = p[1]
pevr = p[2]
# Separate out epoch:version-release
evr_re = re.compile("^(\d:)?(\S+)-(\S+)$")
evr = evr_re.match(pevr)
pepoch = ""
if evr.group(1) is None:
pepoch = "0"
else:
pepoch = evr.group(1).replace(":", "")
pversion = evr.group(2)
prelease = evr.group(3)
print "_pkg", pname, pepoch, pversion, prelease, parch
return 0
except:
print sys.exc_info()[0]
return 1
if useyumlib:
try:
try:
my = yum.YumBase()
ypl = pkg_lists(my)
for pkg in ypl.updates:
print "_pkg %s %s %s %s %s" % (pkg.name, pkg.epoch, pkg.version, pkg.release, pkg.arch)
finally:
my.closeRpmDB()
except IOError, e:
print "_err IOError %d %s" % (e.errno, e)
sys.exit(1)
except AttributeError, e:
# catch yumlib errors in buggy 2.x versions of yum
print "_err AttributeError %s" % e
sys.exit(1)
else:
rc = shell_out()
sys.exit(rc)
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