cloud-init: unexpected messages are printed in hypervisor's console

[andrewjjenkins]

When cloud-init runs, error messages like the following may be printed in the hypervisor's console:

These error messages come from the "injected during image creation" code. Namely /config/os-functions/openstack-datasource.sh
It initially copied user data (from configdrive) as a file directly into its own copy. The user data from configdrive is in plain text, but openstack-datasource.sh assumes it's in JSON format. As such it tries to parse it and extract JSON values, but perl script used to do that throws an error.

Here is the repro:
[root@ian-1300-22-cfgdrive:NO LICENSE:Standalone] os-functions # function get_json_value() {

echo -n $(perl -MJSON -ne "$value = decode_json($_)->$1;
$value =~ s/([^a-zA-Z0-9])/$1/g; print $value" $2)
}
[root@ian-1300-22-cfgdrive:NO LICENSE:Standalone] os-functions # test
Found config drive
Found local user data: /config/user-data.json
Successfully called get_user_data
malformed JSON string, neither array, object, number, string or atom, at character offset 0 (before "#!/bin/bashecho "IAN...") at -e line 1, <> line 1.

This was originally reported in internal F5 issue bz599218.