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misc.py: helper roles_to_remotes for generic use

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roles_to_remotes will take a config key, 'roles' by default,
and search cluster.remotes for those roles, returning a list
of remotes that hold it.  The list is uniquified by default,
but that can be overridden.  So you can have a task that
should run on specific roles, configure it with
"roles: [mon.0 server.0 osd.2]", and call this to get a list
of remotes that contain those roles.

Signed-off-by: Dan Mick <dan.mick@inktank.com>
This commit is contained in:
Dan Mick 2014-01-31 16:07:52 -08:00
parent c1bc7fcc7f
commit 9b2b2c28f1
1 changed files with 15 additions and 0 deletions
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15
teuthology/misc.py
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@ -872,6 +872,21 @@ def replace_all_with_clients(cluster, config):
norm_config['client.{id}'.format(id=client)] = config['all']
return norm_config
def roles_to_remotes(cluster, config, attrname='roles', unique=True):
"""
Get a list of roles from attrname, and return a list of
remotes corresponding to those roles. If 'unique' is False,
allow duplicates in the returned remote list (if a remote serves
multiple roles). attrname may not exist, in which case the
returned list is empty.
"""
roles = config.get(attrname, list())
remotes = []
for role in roles:
rem = cluster.only(role).remotes.keys()[0]
if (not unique) or (rem not in remotes):
remotes.append(rem)
return remotes
def deep_merge(a, b):
if a is None: