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# Copyright 2021 Northern.tech AS
# This file is part of CFEngine 3 - written and maintained by Northern.tech AS.
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; version 3.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
# To the extent this program is licensed as part of the Enterprise
# versions of Cfengine, the applicable Commercial Open Source License
# (COSL) may apply to this file if you as a licensee so wish it. See
# included file COSL.txt.
#+begin_src cfengine3
body common control
{
bundlesequence => { run };
}
bundle agent run
{
vars:
# you can also readjson() from a file
"groups" data => parsejson('{
"ByGroup":
{
"App1":
[
"GrpA",
"GrpB",
"GrpC"
],
"App2":
[
"GrpX",
"GrpY",
"GrpZ"
]
},
"ByApp":
{
"App1":
[
"Host1",
"Host2",
"Host3"
],
"App2":
[
"Host1",
"Host3"
]
}
}');
methods:
# use the first one on the client
#"go" usebundle => appgroups($(sys.uqhost), @(groups));
"go" usebundle => appgroups("Host1", @(groups));
"go" usebundle => appgroups("Host2", @(groups));
}
bundle agent appgroups(name, g)
{
classes:
# stage (3) now for each APP, define have_app_APP if the host is in APP's host list
"have_app_$(apps)" expression => strcmp($(name), "$(hosts_$(apps))");
# stage (4) define the class have_group_GROUP for every GROUP belonging to APP
"have_group_$(groups_$(apps))" expression => "have_app_$(apps)";
# stage (5) define the class have_group if we found any groups
"have_group" not => strcmp("0", length("$(cname)_list"));
vars:
# stage (1) start here: we get the apps from the list of "by app" keys
"apps" slist => getindices("g[ByApp]");
"apps_str" string => format("%S", "apps");
# stage (2) now for each app, we collect the hosts assigned to it
"hosts_$(apps)" slist => getvalues("g[ByApp][$(apps)]");
"hosts_$(apps)_str" string => format("%S", "hosts_$(apps)");
# stage (2) now for each app, we collect the groups assigned to it
"groups_$(apps)" slist => getvalues("g[ByGroup][$(apps)]");
"groups_$(apps)_str" string => format("%S", "groups_$(apps)");
# stage (5) collect the space-separated group names from an intermediate array
"cname" string => canonify($(name));
"$(cname)_grouplist[$(groups_$(apps))]" string => "1",
if => "have_app_$(apps)";
"$(cname)_grouplist_slist" slist => getvalues("$(cname)_grouplist");
# get the keys of the array and sort them, then join with spaces
"$(cname)_list" slist => getindices("$(cname)_grouplist");
"$(cname)_list_sorted" slist => sort("$(cname)_list", "lex");
"$(cname)_list_spaces" string => join(" ", "$(cname)_list_sorted");
reports:
# stage (1)
"$(this.bundle): looking for $(name)";
"$(this.bundle): apps: $(apps_str)";
# stage (2)
"$(this.bundle): hosts for $(apps): $(hosts_$(apps)_str)";
"$(this.bundle): groups for $(apps): $(groups_$(apps)_str)";
# stage (3)
"$(this.bundle): $(name) is assigned $(apps)"
if => "have_app_$(apps)";
# stage (4)
"$(this.bundle): all groups for $(name) = $(groups_$(apps))"
if => "have_group_$(groups_$(apps))";
# stage (5)
have_group::
"$(this.bundle): space-separated groups for $(name) = $($(cname)_list_spaces)";
}
#+end_src
###############################################################################
#+begin_src example_output
#@ ```
#@ R: appgroups: looking for Host1
#@ R: appgroups: apps: { "App1", "App2" }
#@ R: appgroups: hosts for App1: { "Host1", "Host2", "Host3" }
#@ R: appgroups: hosts for App2: { "Host1", "Host3" }
#@ R: appgroups: groups for App1: { "GrpA", "GrpB", "GrpC" }
#@ R: appgroups: groups for App2: { "GrpX", "GrpY", "GrpZ" }
#@ R: appgroups: Host1 is assigned App1
#@ R: appgroups: Host1 is assigned App2
#@ R: appgroups: all groups for Host1 = GrpA
#@ R: appgroups: all groups for Host1 = GrpB
#@ R: appgroups: all groups for Host1 = GrpC
#@ R: appgroups: all groups for Host1 = GrpX
#@ R: appgroups: all groups for Host1 = GrpY
#@ R: appgroups: all groups for Host1 = GrpZ
#@ R: appgroups: space-separated groups for Host1 = GrpA GrpB GrpC GrpX GrpY GrpZ
#@ R: appgroups: looking for Host2
#@ R: appgroups: Host2 is assigned App1
#@ R: appgroups: all groups for Host2 = GrpA
#@ R: appgroups: all groups for Host2 = GrpB
#@ R: appgroups: all groups for Host2 = GrpC
#@ R: appgroups: space-separated groups for Host2 = GrpA GrpB GrpC
#@ ```
#+end_src
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