glance image-tag-update, not updating a tag whose length is more than 255

[M V P Nitesh]

The command "glance image-tag-update <IMAGE_ID> <TAG_VALUE>" will update the tag to the give <IMAGE_ID>. If the length of the <TAG_VALUE> is more than 255 , it won't update the tag and throws the below error:

"400 Bad Request: Provided object does not match schema 'image': u'123niteshgjkdhgjfdghfdjghfdjkghjfdghsdjfghjsdfghfdjghfdjghfdjghsdfgjkshdkjsfhdgljksfdghfsdkjghfdsjkdkghdsfjghdfjkhgjkdfghjkdfghjsdfkghfdjkghdfjkghsdfkjghsdfgkljsfhdgsjkdfghfsdjkghsddjskfndjighfnidughndfjgkhfndjkbhfdnbujfhdnbuidfsdsafsfsdfsdfdsfsdfdsdfdfffsdfsdfdsfsdf' is too long: Failed validating 'maxLength' in schema['properties']['tags']['items']:: {'maxLength': 255, 'type': 'string'}: On instance['tags'][0]:: u'123niteshgjkdhgjfdghfdjghfdjkghjfdghsdjfghjsdfghfdjghfdjghfdjghsdfgjkshdkjsfhdgljksfdghfsdkjghfdsjkdkghdsfjghdfjkhgjkdfghjkdfghjsdfkghfdjkghdfjkghsdfkjghsdfgkljsfhdgsjkdfghfsdjkghsddjskfndjighfnidughndfjgkhfndjkbhfdnbujfhdnbuidfsdsafsfsdfsdfdsfsdfdsdfdfffsdfsdfdsfsdf' (HTTP 400)"

[Stuart McLaren (stuart-mclaren)]

As reported in the response, the maximum length you can set the tag to is 255 characters:

 'maxLength': 255

So Glance is correctly enforcing this limit.

[M V P Nitesh (m-nitesh)]

Hi Struart,
I want to through proper error message like "Tag length should be less than 256"

[M V P Nitesh (m-nitesh)]

Hi Stuart ,

I just want to update the error message as "Tag length should be less than 256" and update the Cli reference of http://docs.openstack.org/cli-reference/glance.html#glance-image-tag-update-v2 for <TAG_VALUE> as
"Value of the tag. Maximum length of tag can be 255"

[Stuart McLaren (stuart-mclaren)]

Hi,

To make things clearer could you update the description? The current description doesn't describe a problem: it describes expected behaviour.

Right now the error message -- which I think is clear -- is autogenerated by the code enforcing the schema. What are you proposing? I'm not sure that we want to go down a path where we're creating specific code/messages for every possible schema validation failure.

[M V P Nitesh (m-nitesh)]

I want to do two things
1) I want to update the description for <TAG_VALUE> as "Value of the tag. Maximum length of tag can be 255"
2) Check the length of tag before updating it , if the length of tag is less than 256 i wanted to allow the tag to be updated and if it is more than 255 i want to skip the updation and throw error as "Tag length should be less than 256"