support/testing: add strace runtime test

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -1818,6 +1818,7 @@ F:	support/testing/tests/package/test_rdma_core.py
 F:	support/testing/tests/package/test_rdma_core/
 F:	support/testing/tests/package/test_screen.py
 F:	support/testing/tests/package/test_sed.py
+F:	support/testing/tests/package/test_strace.py
 F:	support/testing/tests/package/test_stress_ng.py
 F:	support/testing/tests/package/test_tcl.py
 F:	support/testing/tests/package/test_tcl/

support/testing/tests/package/test_strace.py

@@ -0,0 +1,37 @@
+import os
+
+import infra.basetest
+
+
+class TestStrace(infra.basetest.BRTest):
+    config = infra.basetest.BASIC_TOOLCHAIN_CONFIG + \
+        """
+        BR2_PACKAGE_STRACE=y
+        BR2_TARGET_ROOTFS_CPIO=y
+        # BR2_TARGET_ROOTFS_TAR is not set
+        """
+
+    def test_run(self):
+        cpio_file = os.path.join(self.builddir, "images", "rootfs.cpio")
+        self.emulator.boot(arch="armv5",
+                           kernel="builtin",
+                           options=["-initrd", cpio_file])
+        self.emulator.login()
+
+        # Check the program can execute.
+        self.assertRunOk("strace --version")
+
+        test_file = "buildroot-strace-test.txt"
+        test_file_mode = "0600"
+        strace_log = "strace.log"
+
+        # Create a test file.
+        self.assertRunOk(f"touch {test_file}")
+
+        # Run strace on a chmod
+        cmd = f"strace -o {strace_log} chmod {test_file_mode} {test_file}"
+        self.assertRunOk(cmd)
+
+        # Check the strace log contain a call to chmod()
+        expected_str = f"chmod(\"{test_file}\", {test_file_mode}) = 0"
+        self.assertRunOk(f"grep -F '{expected_str}' {strace_log}")