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#!/usr/bin/python
# vim: expandtab:tabstop=4:shiftwidth=4
'''
Ansible module to test whether a yum update or install will succeed,
without actually performing it or running yum.
parameters:
packages: (optional) A list of package names to install or update.
If omitted, all installed RPMs are considered for updates.
'''
import sys
import yum # pylint: disable=import-error
from ansible.module_utils.basic import AnsibleModule
def main(): # pylint: disable=missing-docstring,too-many-branches
module = AnsibleModule(
argument_spec=dict(
packages=dict(type='list', default=[])
),
supports_check_mode=True
)
def bail(error): # pylint: disable=missing-docstring
module.fail_json(msg=error)
yb = yum.YumBase() # pylint: disable=invalid-name
yb.conf.disable_excludes = ["all"] # assume the openshift excluder will be managed, ignore current state
# determine if the existing yum configuration is valid
try:
yb.repos.populateSack(mdtype='metadata', cacheonly=1)
# for error of type:
# 1. can't reach the repo URL(s)
except yum.Errors.NoMoreMirrorsRepoError as e: # pylint: disable=invalid-name
bail('Error getting data from at least one yum repository: %s' % e)
# 2. invalid repo definition
except yum.Errors.RepoError as e: # pylint: disable=invalid-name
bail('Error with yum repository configuration: %s' % e)
# 3. other/unknown
# * just report the problem verbatim
except: # pylint: disable=bare-except; # noqa
bail('Unexpected error with yum repository: %s' % sys.exc_info()[1])
packages = module.params['packages']
no_such_pkg = []
for pkg in packages:
try:
yb.install(name=pkg)
except yum.Errors.InstallError as e: # pylint: disable=invalid-name
no_such_pkg.append(pkg)
except: # pylint: disable=bare-except; # noqa
bail('Unexpected error with yum install/update: %s' %
sys.exc_info()[1])
if not packages:
# no packages requested means test a yum update of everything
yb.update()
elif no_such_pkg:
# wanted specific packages to install but some aren't available
user_msg = 'Cannot install all of the necessary packages. Unavailable:\n'
for pkg in no_such_pkg:
user_msg += ' %s\n' % pkg
user_msg += 'You may need to enable one or more yum repositories to make this content available.'
bail(user_msg)
try:
txn_result, txn_msgs = yb.buildTransaction()
except: # pylint: disable=bare-except; # noqa
bail('Unexpected error during dependency resolution for yum update: \n %s' %
sys.exc_info()[1])
# find out if there are any errors with the update/install
if txn_result == 0: # 'normal exit' meaning there's nothing to install/update
pass
elif txn_result == 1: # error with transaction
user_msg = 'Could not perform a yum update.\n'
if len(txn_msgs) > 0:
user_msg += 'Errors from dependency resolution:\n'
for msg in txn_msgs:
user_msg += ' %s\n' % msg
user_msg += 'You should resolve these issues before proceeding with an install.\n'
user_msg += 'You may need to remove or downgrade packages or enable/disable yum repositories.'
bail(user_msg)
# TODO: it would be nice depending on the problem:
# 1. dependency for update not found
# * construct the dependency tree
# * find the installed package(s) that required the missing dep
# * determine if any of these packages matter to openshift
# * build helpful error output
# 2. conflicts among packages in available content
# * analyze dependency tree and build helpful error output
# 3. other/unknown
# * report the problem verbatim
# * add to this list as we come across problems we can clearly diagnose
elif txn_result == 2: # everything resolved fine
pass
else:
bail('Unknown error(s) from dependency resolution. Exit Code: %d:\n%s' %
(txn_result, txn_msgs))
module.exit_json(changed=False)
if __name__ == '__main__':
main()
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