martingehrke

#this requires cfengine 3.7 for the if and unless
vars:
  "file" string => "/full/path/to/file.json";
  classname:: #always gate file reads as tightly as possible
    "data" data => readjson("$(file)", inf),
      if => fileexists("$(file)"), #don't try to read if file is missing
      unless => isvariable("$(this.promiser)"); #don't read file more than once

#you can't do all that in pre 3.7 but you can do some
# sometimes I prefer an error if the file is missing

martingehrke

#it can be non-intuitive to get a slist from a json data object in CFEngine
# this can be useful if you have a json with hostnames as keys
vars:
  "data" data => parsejson("{ "key": ["one", "two", "three"] }");
  "values" slist => getvalues("data[key]"); #just pass the name, not the variable itself
  #just an example, I haven't loaded moredata in this gist
  "info" slist => getvalues("moredata[$(sys.fqhost)]");

martingehrke

#this code has not been tested for minor bugs, but the idea is solid
vars:
  "sync_data" data => parsejson('{ "dir1":"class1", "dir2":"class2" }');
  "dirs" slist => getindices("sync_data");
  
files:
  "$(dirs)"
    create => "true",
    copy_from => secure_cp("/base/$(dirs)", "$(sys.policy_hub)"),
    if => "$(sync_data[dirs])";

martingehrke

description "BitTorrent Sync"

start on filesystem
stop on shutdown

respawn

expect fork

script

martingehrke

#pseudocode
if x == 7 and (y<10 or y>20): 
  do something

#using classes
or_class_set or => {"less_than_ten", "greater_than_twenty"};
and_class_set and => {"or_class_set", "equals_seven"};
#is the same as
and_class_set and => {"equals_seven", "less_than_ten|greater_than_twenty"};