cloud-init team mailing list archive

["Jorgensen, Andrew" <ajorgens@xxxxxxxxxx>]

That's my understanding. It should be possible to override, but not to merge. I don't know if the jsonpatch merging works differently but I suspect it doesn't.


________________________________________
From: Thomas Stringer <Thomas.Stringer@xxxxxxxxxxxxx>
Sent: Wednesday, August 21, 2019 4:10 AM
To: Jorgensen, Andrew; cloud-init@xxxxxxxxxxxxxxxxxxx
Subject: Re: Merge userdata and vendordata?

That makes total sense, thanks for the insight! So essentially there currently is no way then to merge userdata with vendordata. Does that sound correct?

On 8/20/19, 7:54 PM, "Jorgensen, Andrew" <ajorgens@xxxxxxxxxx> wrote:

    Unfortunately merging only happens within a configuration source, so for example you can merge multiple configs from /etc/cloud/cloud.cfg.d  and you can merge mime multipart parts from userdata, but a merge strategy doesn't define what happens when the file configs are merged with the userdata.

    See https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugs.launchpad.net%2Fcloud-init%2F%2Bbug%2F1532234&amp;data=02%7C01%7CThomas.Stringer%40microsoft.com%7C6d1a32a7747140a3da1c08d725c9b38f%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637019420549308536&amp;sdata=AKrUYR7nJd5GDchK741Bwi8v2RX9ZNlHRqjPNoSmYwk%3D&amp;reserved=0 for some background and thinking on this.

    Kind Regards,
    Andrew Jorgensen

    ________________________________________
    From: Cloud-init <cloud-init-bounces+ajorgens=amazon.com@xxxxxxxxxxxxxxxxxxx> on behalf of Thomas Stringer <Thomas.Stringer@xxxxxxxxxxxxx>
    Sent: Tuesday, August 20, 2019 12:51 PM
    To: cloud-init@xxxxxxxxxxxxxxxxxxx
    Subject: [Cloud-init] Merge userdata and vendordata?

    I'm currently trying to figure out how to prevent userdata from overwriting vendordata. I was under the impression that specifying merge_how for _both_ userdata and vendordata might be the solution, but in my testing I am not seeing this.

    Userdata - /var/lib/cloud/instance/user-data.txt
    ===========================
    #cloud-config
    merge_how:
     - name: list
       settings: [append]
     - name: dict
       settings: [no_replace, recurse_list]

    runcmd:
      - echo hello world from user  > /run/hello_world_user

    Vendordata - /var/lib/cloud/instance/vendor-data.txt
    ===========================
    #cloud-config
    merge_how:
     - name: list
       settings: [append]
     - name: dict
       settings: [no_replace, recurse_list]

    runcmd:
      - echo hello world from vendor  > /run/hello_world_vendor


    I would expect the existence of _both_ files, /run/hello_world_user and /run/hello_world_vendor. But only /run/hello_world_user exists. Am I doing something wrong? If merge_how isn't the way to merge vendordata and userdata, is there another way?

    Thank you in advance!
    Thomas

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