[RFC PATCH v2 03/10] selftests/verification: fix verificationtest-ktap for out-of-tree execution

[wen.yang@linux.dev]

From: Wen Yang <wen.yang@linux.dev>

verificationtest-ktap used a CWD-relative path (../ftrace/ftracetest)
and a relative argument (../verification) for --rv.  This works when
the shell changes into the verification directory first, but breaks
when the script is invoked directly - e.g. by the kselftest runner or
vng - because the working directory is the kernel source root, not the
script's own directory.

Fix this by computing the script's directory from $0 with cd/dirname/pwd
and using absolute paths for both the ftracetest invocation and the --rv
argument.  Also export the directory to PATH so that check_requires in
the ftracetest framework can locate helper binaries.

Signed-off-by: Wen Yang <wen.yang@linux.dev>
---
 tools/testing/selftests/verification/verificationtest-ktap | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/verification/verificationtest-ktap b/tools/testing/selftests/verification/verificationtest-ktap
index 18f7fe324e2f..456b8578a307 100755
--- a/tools/testing/selftests/verification/verificationtest-ktap
+++ b/tools/testing/selftests/verification/verificationtest-ktap
@@ -5,4 +5,6 @@
 #
 # Copyright (C) Arm Ltd., 2023
 
-../ftrace/ftracetest -K -v --rv ../verification
+dir=$(cd "$(dirname "$0")" && pwd)
+export PATH="$dir:$PATH"
+"$dir/../ftrace/ftracetest" -K -v --rv "$dir"
-- 
2.25.1