[bug] Change in YAML generated from trim_conandata()

[bradenmcd]

Describe the bug

We maintain a fork of conan-center-index. Our CI to build packages from this fork includes a hook that calls trim_conandata(). At some point over the past year+, the YAML emitted from trim_conandata() seems to have changed.

We have an activemq-cpp/3.9.5 that was originally uploaded to our Artifactory instance December 10, 2025. Its conandata.yml looks like this:

sources:
  "3.9.5":
    url: "https://github.com/apache/activemq-cpp/archive/refs/tags/activemq-cpp-3.9.5.tar.gz"
    sha256: "3a56b526360155fd920f136b187ffb84942890b9b7e206976c81ef9f2ab2b11b"

A recent build introduced a new rrev due to conandata.yml that looks instead like this:

sources:
  3.9.5:
    sha256: 3a56b526360155fd920f136b187ffb84942890b9b7e206976c81ef9f2ab2b11b
    url: https://github.com/apache/activemq-cpp/archive/refs/tags/activemq-cpp-3.9.5.tar.gz

The newer one is missing quotes and the entries are ordered differently.

The newer one was built with Conan 2.28.0 and the older one would have been built with Conan 2.4.1.

How to reproduce it

No response

[memsharded]

Hi @bradenmcd

Thanks for your report.

I am trying to reproduce, but so far I haven't been able:

# With latest COnan
$ conan export . --version=3.9.5

======== Exporting recipe to the cache ========
activemq-cpp/3.9.5:
  Exporting package recipe: C:\Users\conanws\conan-center-index\recipes\activemq-cpp\all\conanfile.py
activemq-cpp/3.9.5: exports:
  File 'conandata.yml' found. Exporting it...
activemq-cpp/3.9.5:
  Calling export()
  Copied 1 '.yml' file: conandata.yml
  Copied 1 '.py' file: conanfile.py
  Exported to cache folder: C:\Users\.conan2\p\activ65b56b68a59da\e
  Exported: activemq-cpp/3.9.5#77afb3935f0053f4219aca4cd9e89cf5 (2026-06-09 07:48:24 UTC)

$ cat C:\Users\.conan2\p\activ65b56b68a59da\e\conandata.yml
sources:
  3.9.5:
    sha256: 3a56b526360155fd920f136b187ffb84942890b9b7e206976c81ef9f2ab2b11b
    url: https://github.com/apache/activemq-cpp/archive/refs/tags/activemq-cpp-3.9.5.tar.gz

# Now we change to Conan 2.4.1
$ conan export . --version=3.9.5
WARN: Downgrading cache from Conan 2.30.0-dev to 2.4.1

======== Exporting recipe to the cache ========
activemq-cpp/3.9.5: Exporting package recipe: C:\Users\conanws\conan-center-index\recipes\activemq-cpp\all\conanfile.py
activemq-cpp/3.9.5: exports: File 'conandata.yml' found. Exporting it...
activemq-cpp/3.9.5: Calling export()
activemq-cpp/3.9.5: Copied 1 '.yml' file: conandata.yml
activemq-cpp/3.9.5: Copied 1 '.py' file: conanfile.py
activemq-cpp/3.9.5: Exported to cache folder: C:\Users\.conan2\p\activ65b56b68a59da\e
activemq-cpp/3.9.5: Exported: activemq-cpp/3.9.5#77afb3935f0053f4219aca4cd9e89cf5 (2026-06-09 07:50:00 UTC)

$ cat C:\Users\.conan2\p\activ65b56b68a59da\e\conandata.yml
sources:
  3.9.5:
    sha256: 3a56b526360155fd920f136b187ffb84942890b9b7e206976c81ef9f2ab2b11b
    url: https://github.com/apache/activemq-cpp/archive/refs/tags/activemq-cpp-3.9.5.tar.gz

I have also inspected the code, and it seems the core implementation of this function is from #14169, and hasn't change since then.
Maybe there is some other factor that could be causing this? Have you upgraded your Python version recently too?

[memsharded]

Hi @bradenmcd

Any new feedback here?
Did you manage to reproduce somehow? Did you check the Python version possible upgrade? Thanks for the feedback.