Validating list key

YANG
1

Below is an example of the yang file i am using:

typedef utilities-enumeration
{
    type enumeration
    {
        enum all-utilities;
        enum util-a-enum;
        enum util-a-enum;
        enum util-a-enum;
        enum util-a-enum;
    }
    default all-utilities;
}

grouping utility-type
{
    leaf utility-name
    {
        type utility-enumeration;
    }
}

grouping utility-config
{
    container some-util-config
    {
    .
    .
    .
    }
}

grouping util-a-config-type
{
    container util-a-config
    {
        uses utility-config;
        must "../utility[utility-name]/utility-name = util-a-enum"
        {
            error-message "The util-a-enum must be specified for this utility";
        }
    }
}

grouping application-type
{
    container utilities
    {
        list utility
        {
            uses utility-type;
            key utility-name;
            uses util-a-config-type;
            uses util-b-config-type;
        }
    }
}

What needs to happen is that if util-a-config-type is configured as a utility, the utility-name should read util-a-enum. A similar thing needs to happen for util-b-config, etc.

However, the must statement in util-a-config is unable to find utility-name, and the commit fails. I have tried various paths and none worked.

  1. How should the xpath be specified in this must statement?
  2. What debug information can I use to understand how confd evaluates the must statement, so I can figure out the xpath by myself?

Thanks

2

If you have something like this:

$ pyang -f tree utilities.yang
module: utilities
   +--rw utilities
   |  +--rw utility* [utility-name]
   |     +--rw utility-name     utility-enumeration
   |     +--rw util-a-config
            your must() expression here
   |        +--rw some-util-config
   |           +--rw some-util?   string

$ confd_cli -u admin -C
admin connected from 127.0.0.1
# devtools true
# config       
Entering configuration mode terminal
# utilities utility util-a-enum util-a-config some-util-config some-util test
# pwd
Current submode path:
  utilities utility util-a-enum
# xpath must "current()/utility-name = 'util-a-enum'"                        
true

I.e. your must expression could be something like must "current()/../utility-name = 'util-a-enum'"

And as @waitai replied to you some time ago:

3

Thank you for your reply!

I did use the XPath trace log, but it has so much information that I couldn’t make heads or tails of it.

As for the ‘devtools’ option in the CLI: my CLI does not have this command. I believe we are using confd 3.7.1.

I will try your proposal and let you know.

Thanks again!

Howling

4

Worked! Thanks!

Could you tell me how to use devtools in version 3.7.1?

Thanks again

5

Upgrade to ConfD 6.3 or later, or do something like what @jlawitzke recommended to you some time ago.