Fix: handle OSError from os.get_terminal_size() in CLI table rendering for non-TTY environments

[vuyelwadr]

Summary

This PR fixes a bug in the dstack CLI where running commands like dstack ps in a non-interactive environment (subprocess, PTY, or script) would crash with:

Traceback (most recent call last):
File "/Users/x/.local/bin/dstack", line 10, in
sys.exit(main())
File "/Users/x/.local/share/uv/tools/dstack/lib/python3.10/site-packages/dstack/_internal/cli/main.py", line 87, in main
args.func(args)
File "/Users/x/.local/share/uv/tools/dstack/lib/python3.10/site-packages/dstack/_internal/cli/commands/ps.py", line 44, in _command
console.print(run_utils.get_runs_table(runs, verbose=args.verbose))
File "/Users/x/.local/share/uv/tools/dstack/lib/python3.10/site-packages/dstack/_internal/cli/utils/run.py", line 152, in get_runs_table
table = Table(box=None, expand=os.get_terminal_size()[0] <= 110)
OSError: [Errno 25] Inappropriate ioctl for device

The error was caused by unguarded calls to os.get_terminal_size() in the CLI’s table rendering code. This patch wraps those calls in a try/except block and uses a default width (120) if the call fails, ensuring the CLI works in both TTY and non-TTY environments.

Details

• All uses of os.get_terminal_size() are now wrapped in try/except.
• If an OSError is raised, a default width of 120 is used.
• This prevents crashes when running dstack in automation, CI, or as a subprocess.

Steps to Reproduce

1. Run dstack ps in a Python subprocess or PTY (not a real terminal).
2. Observe the crash with OSError.
3. With this patch, the command works and outputs as expected.

Why this is needed

• Many users want to automate or monitor dstack runs from scripts or other tools.
• The CLI should not crash in non-interactive environments.

Related Issue

• [Bug]: dstack CLI crashes with OSError when run in subprocess or non-TTY environment #2598

---

Thank you for reviewing!

[peterschmidt85]

IMO, it's better to use something like this:

import shutil
table = Table(box=None, expand=shutil.get_terminal_size(fallback=(120, 40)).columns <= 110)