[BUG] using an empty compose file causes project name to be unset

[designermonkey]

Description

I have a command which concatenates multiple docker-compose yaml files, like so:

docker compose -f ./docker-compose.yml -f ./docker-compose.dev.yml -f ./docker-compose.uat.yml build

Because of the way our local build system works, the last file is empty until we define specifics for our UAT process. We have defined the name top-level element in the initial docker-compose.yml file.

Using this empty placeholder file at the end of the list seems to unset content from the other files resulting in the following:

project name can't be empty. Use `--project-name` to set a valid name

I can't check whether it is unsetting other content as well

Steps To Reproduce

Use multiple compose files with content, except the last file which is empty:

docker compose -f ./docker-compose.yml -f ./docker-compose.dev.yml -f ./docker-compose.uat.yml build

Compose Version

v2.24.3-desktop.1

Docker Environment

Docker desktop: 4.27.1 (136059) on Mac OS 14.2.1 (23C71)

Anything else?

I accidentally pressed enter while filling out the form, if anything is missing, please let me know.

[designermonkey]

If I add --- to the top of the empty file, I get Top-level object must be a mapping instead.

Shouldn't an empty yaml file still be considered valid yaml content? (I don't actually know).

[milas]

This fix has been included in Compose 2.24.7+. If you continue to have problems after upgrading, comment here and we can re-open the issue or create a new one as appropriate. Thanks for the report!