scripts containing limactl terminated unexpectedly when piped to sh

[RafalSkolasinski]

Description

I wanted to automate some operations using lima with shell scripts. Just for my own convenience and to be able to quickly demonstrate things I wanted to put script on github pages and just nicely curl to sh, like one does with k3s [1]
when I hit quite unexpected issue.

It can be reproduced with simple script, let's call it script.sh

#!/usr/bin/env sh

limactl shell default sudo apt-get update
limactl shell default sudo apt-get -y install avahi-daemon

If I run it directly it works fine:

$ ./script.sh                                                        
Hit:1 http://ports.ubuntu.com/ubuntu-ports oracular InRelease
Hit:2 http://ports.ubuntu.com/ubuntu-ports oracular-updates InRelease
Hit:3 http://ports.ubuntu.com/ubuntu-ports oracular-backports InRelease
Hit:4 http://ports.ubuntu.com/ubuntu-ports oracular-security InRelease
Reading package lists... Done
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
avahi-daemon is already the newest version (0.8-13ubuntu6).
0 upgraded, 0 newly installed, 0 to remove and 35 not upgraded.

but if I try to pipe it to sh, like I would do if I was curl-ing it in with one-liners i terminates at the end of apt-get update command

cat script.sh | sh
Hit:1 http://ports.ubuntu.com/ubuntu-ports oracular InRelease
Hit:2 http://ports.ubuntu.com/ubuntu-ports oracular-updates InRelease
Hit:3 http://ports.ubuntu.com/ubuntu-ports oracular-backports InRelease
Hit:4 http://ports.ubuntu.com/ubuntu-ports oracular-security InRelease
Reading package lists...

Notice lack of Done in "Reading package lists... Done".

---

Lima: 1.0.1
Macos: 15.1.1

---

[1] curl -sfL https://get.k3s.io | sh -s - --disable servicelb --disable traefik

[norio-nomura]

This issue can be reproduced even without using limactl, by starting ssh with stdin not being a terminal.

$ echo ""|ssh -i "/Users/norio/.lima/_config/user" -o StrictHostKeyChecking=no -t -p 49450 127.0.0.1 -- 'sudo apt-get update'
Pseudo-terminal will not be allocated because stdin is not a terminal.
Hit:1 http://deb.debian.org/debian bookworm InRelease
Hit:2 https://download.docker.com/linux/ubuntu noble InRelease
Hit:3 http://ports.ubuntu.com/ubuntu-ports noble InRelease
Hit:4 http://ports.ubuntu.com/ubuntu-ports noble-updates InRelease
Hit:5 http://ports.ubuntu.com/ubuntu-ports noble-backports InRelease
Hit:6 http://ports.ubuntu.com/ubuntu-ports noble-security InRelease
Reading package lists...

The issue does not reproduce when running sudo apt-get update directly inside the VM with stdin not being a terminal, so I believe the cause is related to ssh.

$ limactl shell docker
norio@lima-docker:/Users/norio/ghq/github.com/lima-vm/lima$ echo ""|sudo apt-get update
Hit:1 http://deb.debian.org/debian bookworm InRelease
Hit:2 https://download.docker.com/linux/ubuntu noble InRelease                          
Hit:3 http://ports.ubuntu.com/ubuntu-ports noble InRelease                              
Hit:4 http://ports.ubuntu.com/ubuntu-ports noble-updates InRelease
Hit:5 http://ports.ubuntu.com/ubuntu-ports noble-backports InRelease
Hit:6 http://ports.ubuntu.com/ubuntu-ports noble-security InRelease
Reading package lists... Done