WIP alternative - was Re: [PATCH v3 14/20] selftests/size: add install target to enable test install

From: Tim Bird
Date: Wed Dec 31 2014 - 21:31:51 EST

On 12/24/2014 08:27 AM, Shuah Khan wrote:
> Add a new make target to enable installing test. This target
> installs test in the kselftest install location and add to the
> kselftest script to run the test. Install target can be run
> only from top level kernel source directory.
> Signed-off-by: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>
> ---
> tools/testing/selftests/size/Makefile | 12 +++++++++++-
> 1 file changed, 11 insertions(+), 1 deletion(-)
> diff --git a/tools/testing/selftests/size/Makefile b/tools/testing/selftests/size/Makefile
> index 04dc25e..bb7113b 100644
> --- a/tools/testing/selftests/size/Makefile
> +++ b/tools/testing/selftests/size/Makefile
> @@ -1,12 +1,22 @@
> +TEST_STR = ./get_size || echo get_size selftests: [FAIL]
> +
> all: get_size
> get_size: get_size.c
> $(CC) -static -ffreestanding -nostartfiles -s $< -o $@
> +install:
> + install ./get_size $(INSTALL_KSFT_PATH)
> + @echo "$(TEST_STR)" >> $(KSELFTEST)
> +else
> + @echo Run make kselftest_install in top level source directory
> +endif
> +
> run_tests: all
> - ./get_size
> + @$(TEST_STR)
> clean:
> $(RM) get_size

The install phase is desperately needed for usage of kselftest in
cross-target situations (applicable to almost all embedded). So this
is great stuff.

I worked a bit on isolating the install stuff to a makefile include file.
This allows simplifying some of the sub-level Makefiles a bit, and allowing
control of some of the install and run logic in less places.

This is still a work in progress, but before I got too far along, I wanted
to post it for people to provide feedback. A couple of problems cropped
up that are worth discussing, IMHO.

1) I think it should be a requirement that each test has a single
"main" program to execute to run the tests. If multiple tests are supported
or more flexibility is desired for additional arguments, or that sort of
thing, then that's fine, but the automated script builder should be able
to run just a single program or script to have things work. This also
makes things more consistent. In the case of the firmware test, I created
a single fw_both.sh script to do this, instead of having two separate
blocks in the kselftest.sh script.

2) I've added a CROSS_INSTALL variable, which can call an arbitrary program
to place files on the target system (rather than just calling 'install').
In my case, I'd use my own 'ttc cp' command, which I can extend as necessary
to put things on a remote machine. This works for a single directory,
but things get dicier with sub-directory trees full of files (like
the ftrace test uses.)

If additional items need to be installed to the target, then maybe a setup
program should be used, rather than just copying files.

3) Some of the scripts were using /bin/bash to execute them, rather
than rely on the interpreter line in the script itself (and having
the script have executable privileges). Is there a reason for this?
I modified a few scripts to be executable, and got rid of the
explicit execution with /bin/bash.

The following is just a start... Let me know if this direction looks
OK, and I'll finish this up. The main item to look at is
kselftest.include file. Note that these patches are based on Shuah's
series - but if you want to use these ideas I can rebase them onto
mainline, and break them out per test sub-level like Shuah did.

Let me know what you think.