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# Utility methods for interacting with POSIX objects; mostly user and group
module Puppet::Util::POSIX
# Retrieve a field from a POSIX Etc object. The id can be either an integer
# or a name. This only works for users and groups. It's also broken on
# some platforms, unfortunately.
def old_get_posix_field(space, field, id)
unless id
raise ArgumentError, "Did not get id"
end
if id =~ /^\d+$/
id = Integer(id)
end
prefix = "get" + space.to_s
if id.is_a?(Integer)
if id > 1000000
Puppet.err "Tried to get %s field for silly id %s" % [field, id]
return nil
end
method = (prefix + idfield(space).to_s).intern
else
method = (prefix + "nam").intern
end
begin
return Etc.send(method, id).send(field)
rescue ArgumentError => detail
# ignore it; we couldn't find the object
return nil
end
end
# A degenerate method of retrieving name/id mappings. The job of this method is
# to find a specific entry and then return a given field from that entry.
def get_posix_field(type, field, id)
idmethod = idfield(type)
integer = false
if id =~ /^\d+$/
id = Integer(id)
end
if id.is_a?(Integer)
integer = true
if id > 1000000
Puppet.err "Tried to get %s field for silly id %s" % [field, id]
return nil
end
end
Etc.send(type) do |object|
if integer and object.send(idmethod) == id
return object.send(field)
elsif object.name == id
return object.send(field)
end
end
return nil
end
# Look in memory for an already-managed type and use its info if available.
# Currently unused.
def get_provider_value(type, field, id)
unless typeklass = Puppet::Type.type(type)
raise ArgumentError, "Invalid type %s" % type
end
id = id.to_s
chkfield = idfield(type)
obj = typeklass.find { |obj|
if id =~ /^\d+$/
obj.should(chkfield).to_s == id ||
obj.provider.send(chkfield) == id
else
obj[:name] == id
end
}
return nil unless obj
if obj.provider
begin
val = obj.provider.send(field)
if val == :absent
return nil
else
return val
end
rescue => detail
if Puppet[:trace]
puts detail.backtrace
Puppet.err detail
return nil
end
end
end
end
# Determine what the field name is for users and groups.
def idfield(space)
case Puppet::Util.symbolize(space)
when :gr, :group: return :gid
when :pw, :user, :passwd: return :uid
else
raise ArgumentError.new("Can only handle users and groups")
end
end
# Get the GID of a given group, provided either a GID or a name
def gid(group)
get_posix_field(:group, :gid, group)
end
# Get the UID of a given user, whether a UID or name is provided
def uid(user)
get_posix_field(:passwd, :uid, user)
end
end
# $Id$
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