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#!/usr/bin/ruby
require 'syslog'
#
# This script will update the values of a particular couchdb document. The benefit of this little script over
# using a simple curl command for updating a document is this:
#
# * exit non-zero status if document was not updated.
# * updates existing documents easily, taking care of the _rev id for you.
# * if document doesn't exist, it is created
#
# REQUIREMENTS
#
# gem 'couchrest'
#
# USAGE
#
# couch-doc-update --host <host> --db <db> --id <doc_id> --data <json> [--file <file>]
#
# the content of <file> will be merged with the data provided.
# If you only want the file content use --data '{}'
#
# EXAMPLE
#
# create a new user:
# couch-doc-update --db _users --id org.couchdb.user:ca_daemon --data '{"type": "user", "name": "ca_daemon", "roles": ["certs"], "password": "sshhhh"}'
#
# update a user:
# couch-doc-update --db _users --id org.couchdb.user:ca_daemon --data '{"password":"sssshhh"}'
#
# To update the _users DB on bigcouch, you must connect to port 5986 instead of the default couchdb port 5984
#
begin; require 'rubygems'; rescue LoadError; end # optionally load rubygems
require 'couchrest'
def main
db, id, data = process_options
result = set_document(db, id, data)
exit 0 if result['ok']
raise StandardError.new(result.inspect)
rescue StandardError => exc
db_without_password = db.to_s.sub(/:[^\/]*@/, ':PASSWORD_HIDDEN@')
log "ERROR: " + exc.to_s
log " failed writing to #{db_without_password}/#{id}"
exit 1
end
def log(message)
$stderr.puts message
Syslog.open do |logger|
logger.log(Syslog::LOG_CRIT, message)
end
end
def process_options
#
# parse options
#
host = nil
db_name = nil
doc_id = nil
new_data = nil
filename = nil
loop do
case ARGV[0]
when '--host' then ARGV.shift; host = ARGV.shift
when '--db' then ARGV.shift; db_name = ARGV.shift
when '--id' then ARGV.shift; doc_id = ARGV.shift
when '--data' then ARGV.shift; new_data = ARGV.shift
when '--file' then ARGV.shift; filename = ARGV.shift
when /^-/ then usage("Unknown option: #{ARGV[0].inspect}")
else break
end
end
usage("Missing required option") unless db_name && doc_id && new_data
new_data = MultiJson.load(new_data)
new_data.merge!(read_file(filename)) if filename
db = CouchRest.database(connection_string(db_name, host))
return db, doc_id, new_data
end
def read_file(filename)
data = MultiJson.load( IO.read(filename) )
# strip off _id and _rev to avoid conflicts
data.delete_if {|k,v| k.start_with? '_'}
end
#
# update document
#
def set_document(db, id, data)
doc = get_document(db, id)
if doc
doc.id ||= id
update_document(db, doc, data)
else
create_document(db, id, data)
end
end
def get_document(db, doc_id)
begin
db.get(doc_id)
rescue RestClient::ResourceNotFound
nil
end
end
def update_document(db, doc, data)
doc.reject! {|k,v| !k.start_with? '_'}
doc.merge! data
db.save_doc(doc)
end
def create_document(db, doc_id, data)
data["_id"] = doc_id
db.save_doc(data)
end
def connection_string(database, host)
protocol = "http"
#hostname = "127.0.0.1"
port = "5984"
username = "admin"
password = ""
netrc = File.read('/etc/couchdb/couchdb.netrc')
netrc.scan(/\w+ [\w\.]+/).each do |key_value|
key, value = key_value.split ' '
case key
when "machine" then host ||= value + ':' + port
when "login" then username = value
when "password" then password = value
end
end
host ||= '127.0.0.1:5984'
"%s://%s:%s@%s/%s" % [protocol, username, password, host, database]
end
def usage(s)
$stderr.puts(s)
$stderr.puts("Usage: #{File.basename($0)} --host <host> --db <db> --id <doc_id> --data <json> [--file <file>]")
exit(2)
end
main()
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