Read-only filesystem when upgrade system

[machadofguilherme]

Describe the bug

The error occurs when I try to run nixos-rebuild switch --upgrade. During the execution of the command, the following error message appears:

building Nix...
/nix/store/xdnq3gpfj095i4rca1b7hya4zryvs7ia-nixos-rebuild/bin/nixos-rebuild: line 594: /nix/var/nix/profiles/per-user/root/channels/nixos/.version-suffix: Read-only file system
building the system configuration...

After the command finishes and restarts the computer, the changes proposed by the Nix configuration file have no effect.

Steps To Reproduce

1. Switch to unstable branch.
2. Run nixos-rebuild switch --upgrade

Expected behavior

A successful construction and upgrade.

nix-env --version output
nix-env (Nix) 2.18.7

[jkotran]

I would like to validate the OP's bug report. I'm experiencing this too. I'm on STABLE. It occurs after running:

nix-channel --update

nixos-rebuild switch --upgrade

[ZengarZombolt]

I'm on unstable and getting the same thing with the same commands.

/nix/store/xdnq3gpfj095i4rca1b7hya4zryvs7ia-nixos-rebuild/bin/nixos-rebuild: line 594: /nix/var/nix/profiles/per-user/root/channels/nixos/.version-suffix: Read-only file system

[TudbuT]

Same issue here (also on unstable), but nothing appears broken except for the error message.

[nixos-discourse]

This issue has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/read-only-file-system-at-nixos-rebuild-switch/53352/5