Reproduction of error

Tasks

create-multipass-vm

Create a new VM. If it already exists, delete it with multipass delete nix-issue-8953, then multipass purge

multipass launch -n nix-issue-8953 --disk 10G --cloud-init cloud-init.yaml --verbose

view-startup-logs

You can check the startup logs to check that the commands in cloud-init.yaml were successful.

multipass exec nix-issue-8953 -- sudo cat /var/log/cloud-init-output.log

view-registry-json

We can see that there's a registry.json already created by the startup script. It contains a redirection from github to the local disk.

multipass exec nix-issue-8953 -- sudo cat /root/.config/nix/registry.json

view-registry-list

We can see that Nix is aware of the user flake registry override.

multipass exec nix-issue-8953 -- sudo bash --login -c "nix registry list"

view-system-manager-source-code-dir

We can see that the source code is present on the disk, in the expected place.

multipass exec nix-issue-8953 -- sudo ls /flakes/github.com/numtide/system-manager

run

We can see that it can't run the flake, because it's trying to download from Github, when it should be looking on the local disk instead.

multipass exec nix-issue-8953 -- sudo bash --login -c "nix run github:numtide/system-manager"