On Wed, Oct 29, 2025 at 8:25 PM [off-list ref] wrote:

What appears to be happening is that the Make environment is only using SHELL=/bin/bash
for the outer processing but not the inner #!/bin/sh of t7900. The system is using /bin/sh
as specified, which uses ksh, not bash, which is the trace above. When I run the individual
tests with bash, the error reported goes away. The problem is, with my version of Gnu Make,
4.1.2, the SHELL variable is only being replaced for the command processing of each
recipe. Once the system loader sees the shebang of #!/bin/sh, /bin/sh is used as requested,
and fails out. This means that I have to remember to manually run each test that fails with
bash instead of the default. It is frustrating and now adds hours to my manual evaluation
of the CI/CD results.

The trace above is from sh, not bash because of this.

With Frustration,
Randall

Is this the only ksh-induced failure? And if so, what is inducing the
failure—is it something the test library can work around, or is the
system {k,}sh not behaving portably here?

My preference would be towards making your setup "just work" assuming
there's not a clear contradiction of portable standards somewhere.

-- 
D. Ben Knoble