support/testing: new dmidecode runtime test

Note: this test was not working in Buildroot test infrastructure
before commit [1] was merged, because dmidecode has the string "# "
in its output.

[1] https://gitlab.com/buildroot.org/buildroot/-/commit/0cad947b964be5612a182413da136fcf0dc5a1f2

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>

DEVELOPERS

@@ -1837,6 +1837,7 @@ F:	support/testing/tests/package/test_cryptsetup.py
 F:	support/testing/tests/package/test_cryptsetup/
 F:	support/testing/tests/package/test_ddrescue.py
 F:	support/testing/tests/package/test_ddrescue/
+F:	support/testing/tests/package/test_dmidecode.py
 F:	support/testing/tests/package/test_dos2unix.py
 F:	support/testing/tests/package/test_ed.py
 F:	support/testing/tests/package/test_ethtool.py

support/testing/tests/package/test_dmidecode.py

@@ -0,0 +1,67 @@
+import os
+
+import infra.basetest
+
+
+class TestDmidecode(infra.basetest.BRTest):
+    # We use a x86_64 arch for this dmidecode test because aarch64
+    # SMBIOS is not supported in non-UEFI use-cases (and using a UEFI
+    # aarch64 would make the test longer).
+    config = \
+        """
+        BR2_x86_64=y
+        BR2_x86_corei7=y
+        BR2_TOOLCHAIN_EXTERNAL=y
+        BR2_LINUX_KERNEL=y
+        BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+        BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.6.39"
+        BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
+        BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/x86_64/linux.config"
+        BR2_LINUX_KERNEL_NEEDS_HOST_LIBELF=y
+        BR2_PACKAGE_DMIDECODE=y
+        BR2_TARGET_ROOTFS_CPIO=y
+        BR2_TARGET_ROOTFS_CPIO_GZIP=y
+        # BR2_TARGET_ROOTFS_TAR is not set
+        """
+
+    def test_run(self):
+
+        # An arbitrary SMBIOS OEM string for the test
+        oem_string = "Hello Buildroot SMBIOS"
+
+        kernel = os.path.join(self.builddir, "images", "bzImage")
+        cpio_file = os.path.join(self.builddir, "images", "rootfs.cpio.gz")
+        self.emulator.boot(
+            arch="x86_64",
+            kernel=kernel,
+            kernel_cmdline=["console=ttyS0"],
+            options=["-cpu", "Nehalem", "-m", "256", "-initrd", cpio_file,
+                     "-smbios", f"type=11,value={oem_string}"],
+        )
+        self.emulator.login()
+
+        # Check the program can run
+        cmd = "dmidecode --version"
+        self.assertRunOk(cmd)
+
+        # Check a simple invocation of "dmidecode"
+        self.assertRunOk("dmidecode")
+
+        # Check a simple invocation of "biosdecode"
+        self.assertRunOk("biosdecode")
+
+        # Check dmidecode detects SMBIOS
+        cmd = "dmidecode | grep -E '^SMBIOS .* present\\.$'"
+        self.assertRunOk(cmd)
+
+        # Check the system-manufacturer is QEMU
+        cmd = "dmidecode -s system-manufacturer"
+        output, exit_code = self.emulator.run(cmd)
+        self.assertEqual(exit_code, 0)
+        self.assertEqual(output[0], "QEMU")
+
+        # Check we read back our OEM string
+        cmd = "dmidecode --oem-string 1"
+        output, exit_code = self.emulator.run(cmd)
+        self.assertEqual(exit_code, 0)
+        self.assertEqual(output[0], oem_string)