Bats 1.10.0: Hitting error "tput: No value for $TERM and no -T specified" in Concourse CI

[sriemer]

Describe the bug
Running our tests based on Bats in Concourse CI with a Ubuntu 20.04 docker image causes the following error:
tput: No value for $TERM and no -T specified.

The Concourse CI environment is using TERM=dumb.

To Reproduce
Steps to reproduce the behavior:

1. use your favorite Bats tests (assuming file.bats)
2. run TERM="" bats file.bats

See the only output:

tput: No value for $TERM and no -T specified

Return code: 2 (ENOENT)

Expected behavior
Bats is not failing if tput fails and TERM is not set or is set to dumb.
Bats is running in a safe mode without colors and any other fancy terminal features.

Environment (please complete the following information):

• Bats version 1.10.0
• operating system: Linux, Ubuntu 20.04 Docker image from DockerHub: ubuntu:20.04
• bash --version: GNU bash, version 5.0.17(1)-release (x86_64-pc-linux-gnu)
• Install method: curl -L -O -J https://github.com/bats-core/bats-core/archive/v1.10.0.tar.gz
• Running on Concourse CI build server

Additional context
The Concourse CI environment is using TERM=dumb.
Also running TERM="" bats -x --verbose-run file.bats causes the same single line output.
Using workaround [[ -z "$TERM" || "$TERM" == "dumb" ]] && export TERM="xterm-256color" for now.

[sriemer]

@martin-schulze-vireso Any hint which component might be affected? Otherwise, I'll look into this myself.
Candidates:

bats-core/libexec/bats-core/bats-format-pretty

Lines 33 to 34 in e9fd17a

	update_screen_width() {
	screen_width="$(tput cols)"

,

bats-core/libexec/bats-core/bats

Line 172 in e9fd17a

if [[ -z "${CI:-}" && -t 0 && -t 1 ]] && command -v tput >/dev/null; then

The testing build also only contains a workaround for this:

bats-core/.github/workflows/tests.yml

Line 59 in e9fd17a

TERM: linux # fix tput for tty issue work around

[martin-schulze-vireso]

The main culprit is probably the pretty formatter.

[yangit]

I want to get pretty output to file and unable to because of that.
That output can be useful since a lot of parsers for TAP format have edge cases.