[LTP] [PATCH v2 1/1] tst_test.sh: Add test cmd helper tst_test_cmds()

[Petr Vorel <pvorel@suse.cz>]

+ tst_cmd_available()

tst_test_cmds() is meant to be a check just for a particular test.
Works like tst_check_cmds(), but instead of tst_brk() calls tst_res().

tst_cmd_available() helper can handle cases when command shell builtin
is not available (e.g. Busybox).

Signed-off-by: Petr Vorel <pvorel@suse.cz>
---
Hi,

if you don't like using which or testing with 127 exit code in
tst_cmd_available() (or if you don't like tst_cmd_available()), I
can remove it.


Kind regards,
Petr
---
 doc/test-writing-guidelines.txt | 17 +++++++++++++++++
 testcases/lib/tst_test.sh       | 29 +++++++++++++++++++++++++++--
 2 files changed, 44 insertions(+), 2 deletions(-)

diff --git a/doc/test-writing-guidelines.txt b/doc/test-writing-guidelines.txt
index cbbfe6c0f..320b42bf8 100644
--- a/doc/test-writing-guidelines.txt
+++ b/doc/test-writing-guidelines.txt
@@ -1519,6 +1519,23 @@ existence each of them and exits the test with 'TCONF' on first misssing.
 Alternatively the 'tst_check_cmds()' function can be used to do the same on
 runtime, since sometimes we need to the check at runtime too.
 
+'tst_test_cmds()' can be used for requirements just for a particular test
+as it doesn't exit (it issues 'tst_res TCONF'). Expected usage is:
+...
+
+TST_TESTFUNC=do_test
+. tst_test.sh
+
+do_test()
+{
+	tst_test_cmds cmd || return
+	cmd --foo
+	...
+}
+
+tst_run
+...
+
 Locating kernel modules
 +++++++++++++++++++++++
 
diff --git a/testcases/lib/tst_test.sh b/testcases/lib/tst_test.sh
index 8d49d34b6..b3e803e05 100644
--- a/testcases/lib/tst_test.sh
+++ b/testcases/lib/tst_test.sh
@@ -201,12 +201,37 @@ tst_mkfs()
 	ROD_SILENT mkfs.$fs_type $fs_opts $device
 }
 
+tst_cmd_available()
+{
+	if type command > /dev/null 2>&1; then
+		command -v $1 > /dev/null 2>&1 || return 1
+	else
+		which $1 > /dev/null 2>&1
+		if [ $? -eq 0 ]; then
+			return 0
+		elif [ $? -eq 127 ]; then
+			tst_brk TCONF "missing which command"
+		else
+			return 1
+		fi
+	fi
+}
+
 tst_check_cmds()
 {
 	local cmd
 	for cmd in $*; do
-		if ! command -v $cmd > /dev/null 2>&1; then
-			tst_brk TCONF "'$cmd' not found"
+		tst_cmd_available $cmd || tst_brk TCONF "'$cmd' not found"
+	done
+}
+
+tst_test_cmds()
+{
+	local cmd
+	for cmd in $*; do
+		if ! tst_cmd_available $cmd; then
+			tst_res TCONF "'$cmd' not found"
+			return 1
 		fi
 	done
 }
-- 
2.16.3