diff options
Diffstat (limited to 'roles/openshift_health_checker/library/check_yum_update.py')
-rw-r--r-- | roles/openshift_health_checker/library/check_yum_update.py | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/roles/openshift_health_checker/library/check_yum_update.py b/roles/openshift_health_checker/library/check_yum_update.py new file mode 100644 index 000000000..433795b67 --- /dev/null +++ b/roles/openshift_health_checker/library/check_yum_update.py @@ -0,0 +1,105 @@ +#!/usr/bin/python +''' +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() |