[LTP] [PATCH v2] setpriority01: Skip only PRIO_USER when unable to add test user

[Saravana Kannan <saravanak@google.com>]

We don't need to skip all the tests just because we are unable to add
a test user. Not having a test user only affects PRIO_USER test case.
So just skip that one and continue running the rest of the tests.

This also allows this test case to be built and run on Android.

Change-Id: Ie6eaf771002842fc1c768adf70bb2d1ef534f120
Signed-off-by: Saravana Kannan <saravanak@google.com>
---
 .../kernel/syscalls/setpriority/Makefile      |  5 ----
 .../syscalls/setpriority/setpriority01.c      | 29 +++++++++++++------
 2 files changed, 20 insertions(+), 14 deletions(-)

diff --git a/testcases/kernel/syscalls/setpriority/Makefile b/testcases/kernel/syscalls/setpriority/Makefile
index 5d00984ea..7a1a87a28 100644
--- a/testcases/kernel/syscalls/setpriority/Makefile
+++ b/testcases/kernel/syscalls/setpriority/Makefile
@@ -19,9 +19,4 @@
 top_srcdir		?= ../../../..
 
 include $(top_srcdir)/include/mk/testcases.mk
-
-ifeq ($(ANDROID), 1)
-FILTER_OUT_MAKE_TARGETS	+= setpriority01
-endif
-
 include $(top_srcdir)/include/mk/generic_leaf_target.mk
diff --git a/testcases/kernel/syscalls/setpriority/setpriority01.c b/testcases/kernel/syscalls/setpriority/setpriority01.c
index 38b77b77f..92b1b4ef4 100644
--- a/testcases/kernel/syscalls/setpriority/setpriority01.c
+++ b/testcases/kernel/syscalls/setpriority/setpriority01.c
@@ -92,9 +92,16 @@ static void verify_setpriority(unsigned int n)
 {
 	struct tcase *tc = &tcases[n];
 
+	if (tc->which == PRIO_USER && !user_added) {
+		tst_res(TCONF, "setpriority(%s(%d), %d, -20..19) skipped - Can't add user",
+			str_which(tc->which), tc->which, *tc->who);
+		return;
+	}
+
 	pid = SAFE_FORK();
 	if (pid == 0) {
-		SAFE_SETUID(uid);
+		if (user_added)
+			SAFE_SETUID(uid);
 		SAFE_SETPGID(0, 0);
 
 		TST_CHECKPOINT_WAKE_AND_WAIT(0);
@@ -115,15 +122,19 @@ static void setup(void)
 {
 	const char *const cmd_useradd[] = {"useradd", username, NULL};
 	struct passwd *ltpuser;
+	int rc;
 
-	if (eaccess("/etc/passwd", W_OK))
-		tst_brk(TCONF, "/etc/passwd is not accessible");
-
-	tst_run_cmd(cmd_useradd, NULL, NULL, 0);
-	user_added = 1;
-
-	ltpuser = SAFE_GETPWNAM(username);
-	uid = ltpuser->pw_uid;
+	switch ((rc = tst_run_cmd(cmd_useradd, NULL, NULL, 1))) {
+	case 0:
+		user_added = 1;
+		ltpuser = SAFE_GETPWNAM(username);
+		uid = ltpuser->pw_uid;
+		return;
+	case 255:
+		return;
+	default:
+		tst_brk(TBROK, "Useradd failed (%d)", rc);
+	}
 }
 
 static void cleanup(void)
-- 
2.21.0.360.g471c308f928-goog