On Fri, Jun 02, 2023 at 12:19:17PM -0700, John Hubbard wrote:
> On 6/2/23 08:34, Peter Xu wrote:
> > On Thu, Jun 01, 2023 at 06:33:51PM -0700, John Hubbard wrote:
> > > We cannot depend upon git to reliably retain the executable bit on shell
> > > scripts, or so I was told several years ago while working on this same
> > > run_vmtests.sh script. And sure enough, things such as test_hmm.sh are
> > > lately failing to run, due to lacking execute permissions.
> > >
> > > A nice clean way to fix this would have been to use TEST_PROGS instead
> > > of TEST_FILES for the .sh scripts here. That tells the selftest
> > > framework to run these (and emit a warning if the files are not
> > > executable, but still run them anyway).
> > >
> > > Unfortunately, run_vmtests.sh has its own run_test() routine, which does
> > > *not* do the right thing for shell scripts.
> > >
> > > Fix this by explicitly adding "bash" to each of the shell script
> > > invocations. Leave fixing the overall approach to another day.
> >
> > Is it possible someone just doesn't have "bash" at all? I used to only use
>
> Well, maybe [1]. But that someone won't be running these tests as-is, because
> the tests explicitly require bash, even before this patch.
>
> > "sh" without bash installed I think, but that was not on Linux, so I'm not
> > sure how much that applies..
>
> sh invocations are for when you want to express that this script should
> avoid using bash-specific things, in order to ensure portability to
> other environments.
>
> But here, the run_vmtests.sh file requires bash already, as per the
> first line:
>
> #!/bin/bash
>
> ...which is ultimately why I decided to use bash, rather than sh here.
That one can be easily override with $XXX run_vmtests.sh, hard-coded "bash"
in Makefiles can't, afaiu.
>
> >
> > Maybe use $(SHELL)? I saw a bunch of usage in the tree too.
> >
>
> That's more of a Makefile construct that you are seeing, and only in a
> few odd Makefiles. Recall that in Make, $(SHELL) has the same effect
> that ${SHELL} has in bash/sh, by the way: dereferencing a variable.
>
> And Make's "$(shell ...)" command is what is normally used to *run* a
> shell command, in the kernel's build system.
>
> Having said all that, I will take a quick look at what it would take
> to shift over to the selftest framework's run_test() instead, in
> order to avoid this ugly "fix".
Just to mention that I was not talking about $(shell ...), but the
environment var $(SHELL), or "env | grep SHELL".
Please feel free to have a look at tools/perf/arch/x86/Makefile.
Thanks,
--
Peter Xu
