init: Permission denied

[jeaye]

init: Permission denied

[nh2]

Turns out this was because my /mnt was mounted with the noexec (is it possible that this is the default in Ubuntu 16.04?).

I solved it with mount -o remount,exec /tmp.

Ideally ./install would detect this.

[nh2]

is it possible that this is the default in Ubuntu 16.04?

Looks like the answer is no, and that this is just some "security improvement" shipped by default by my server hoster.

[jeaye]

Awesome job looking into this and I appreciate you reporting your results. I don't think remounting /tmp is something that nixos-in-place should do, especially since it may not be a separate partition or mount in the first place.

I do think it's good having this ticket to will help anyone who's searching for the issue. Are you good with closing this? Did you NixOS install go through smoothly?

[nh2]

I agree that it's not the script's job to remount /tmp.

I wonder though if it could check whether scripts from /tmp can be executed at the start, because the error can be so confusing and many hosters where you'd need nixos-in-place seem to like to do this. E.g. to place a bash script with no contents in the temporary dir it creates and execute it, and echo "Could not execute from /tmp, please check that it's not mounted noexec" if that fails.