[dpdk-dev] [PATCH v3] test: remove meson dependency on /proc file

[Thomas Monjalon <thomas@monjalon.net>]

Meson is detecting the path /proc/sys/vm/nr_hugepages in the call to cat
in app/test/meson.build and then adding it as a build dependency.
This causes build loop if the timestamp of this file keeps changing.

It is fixed by hiding hugepage check in a shell script.

Fixes: 77784ef0fba8 ("test: allow no-huge mode for fast-tests")

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
Tested-by: Lukasz Wojciechowski <l.wojciechow@partner.samsung.com>
Reviewed-by: Lukasz Wojciechowski <l.wojciechow@partner.samsung.com>
Acked-by: Aaron Conole <aconole@redhat.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
---

v2: use variable as pointed by Lukasz
v3: avoid TOCTOU issue as suggested by David
	I'm afraid it requires to re-confirm every reviews above.

---
 MAINTAINERS              | 1 +
 app/test/has-hugepage.sh | 9 +++++++++
 app/test/meson.build     | 8 ++------
 3 files changed, 12 insertions(+), 6 deletions(-)
 create mode 100755 app/test/has-hugepage.sh

diff --git a/MAINTAINERS b/MAINTAINERS
index 4800f6884a..aa619b6762 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1471,6 +1471,7 @@ F: app/test/Makefile
 F: app/test/autotest*
 F: app/test/commands.c
 F: app/test/get-coremask.sh
+F: app/test/has-hugepage.sh
 F: app/test/packet_burst_generator.c
 F: app/test/packet_burst_generator.h
 F: app/test/process.h
diff --git a/app/test/has-hugepage.sh b/app/test/has-hugepage.sh
new file mode 100755
index 0000000000..865e66cddd
--- /dev/null
+++ b/app/test/has-hugepage.sh
@@ -0,0 +1,9 @@
+#! /bin/sh
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright 2020 Mellanox Technologies, Ltd
+
+if [ "$(uname)" = "Linux" ] ; then
+	cat /proc/sys/vm/nr_hugepages || echo 0
+else
+	echo 0
+fi
diff --git a/app/test/meson.build b/app/test/meson.build
index 351d29cb65..542408d614 100644
--- a/app/test/meson.build
+++ b/app/test/meson.build
@@ -399,12 +399,8 @@ dpdk_test = executable('dpdk-test',
 
 has_hugepage = true
 if is_linux
-	check_hugepage = run_command('cat',
-				     '/proc/sys/vm/nr_hugepages')
-	if (check_hugepage.returncode() != 0 or
-	    check_hugepage.stdout().strip() == '0')
-		has_hugepage = false
-	endif
+	check_hugepage = find_program('has-hugepage.sh')
+	has_hugepage = run_command(check_hugepage).stdout().strip() != '0'
 endif
 message('hugepage availability: @0@'.format(has_hugepage))
 
-- 
2.26.0