Re: [PATCH 2/2] selftests: livepatch: functions.sh: Workaround heredoc on older bash

[Miroslav Benes]

Hi,

On Mon, 23 Feb 2026, Marcos Paulo de Souza wrote:

> On Mon, 2026-02-23 at 10:42 -0500, Joe Lawrence wrote:
> > On Fri, Feb 20, 2026 at 11:12:34AM -0300, Marcos Paulo de Souza
> > wrote:
> > > When running current selftests on older distributions like SLE12-
> > > SP5 that
> > > contains an older bash trips over heredoc. Convert it to plain echo
> > > calls, which ends up with the same result.
> > > 
> > 
> > Acked-by: Joe Lawrence <joe.lawrence@xxxxxxxxxx>
> 
> Thanks for the review Joe!
> 
> > 
> > Just curious, what's the bash/heredoc issue?  All I could find via
> > google search was perhaps something to do with the temporary file
> > implementation under the hood.
> 
> # ./test-ftrace.sh 
> cat: -: No such file or directory
> TEST: livepatch interaction with ftrace_enabled sysctl ... ^CQEMU:
> Terminated

I cannot reproduce it locally on SLE12-SP5. The patched test-ftrace.sh 
runs smoothly without 2/2.

linux:~/linux/tools/testing/selftests/livepatch # ./test-ftrace.sh 
TEST: livepatch interaction with ftrace_enabled sysctl ... ok
TEST: trace livepatched function and check that the live patch remains in effect ... ok
TEST: livepatch a traced function and check that the live patch remains in effect ... ok

GNU bash, version 4.3.48(1)-release (x86_64-suse-linux-gnu)

Does "set -x" in the script give you anything interesting?

Miroslav