[1/1] support/testing: add dosfstools runtime test

diff --git a/DEVELOPERS b/DEVELOPERS
index 426590d5c5..f81a632bf4 100644
--- a/DEVELOPERS
+++ b/DEVELOPERS
@@ -1852,6 +1852,8 @@  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_dosfstools.py
+F:	support/testing/tests/package/test_dosfstools/
 F:	support/testing/tests/package/test_ed.py
 F:	support/testing/tests/package/test_ethtool.py
 F:	support/testing/tests/package/test_ethtool/
diff --git a/support/testing/tests/package/test_dosfstools.py b/support/testing/tests/package/test_dosfstools.py
new file mode 100644
index 0000000000..f32ff81c01
--- /dev/null
+++ b/support/testing/tests/package/test_dosfstools.py
@@ -0,0 +1,106 @@ 
+import os
+import subprocess
+
+import infra.basetest
+
+
+class TestDosFsTools(infra.basetest.BRTest):
+    # This test needs a Kernel with vfat and NLS support. The vfat
+    # filesystem also needs character set conversion libraries, since
+    # its default encoding is CP850.
+    kern_frag = \
+        infra.filepath("tests/package/test_dosfstools/linux-vfat.fragment")
+    config = \
+        f"""
+        BR2_aarch64=y
+        BR2_TOOLCHAIN_EXTERNAL=y
+        BR2_TARGET_GENERIC_GETTY_PORT="ttyAMA0"
+        BR2_LINUX_KERNEL=y
+        BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+        BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.6.47"
+        BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
+        BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/aarch64-virt/linux.config"
+        BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="{kern_frag}"
+        BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
+        BR2_PACKAGE_DOSFSTOOLS=y
+        BR2_PACKAGE_DOSFSTOOLS_FATLABEL=y
+        BR2_PACKAGE_DOSFSTOOLS_FSCK_FAT=y
+        BR2_PACKAGE_DOSFSTOOLS_MKFS_FAT=y
+        BR2_SYSTEM_ENABLE_NLS=y
+        BR2_TARGET_ROOTFS_CPIO=y
+        BR2_TARGET_ROOTFS_CPIO_GZIP=y
+        # BR2_TARGET_ROOTFS_TAR is not set
+        BR2_TOOLCHAIN_GLIBC_GCONV_LIBS_COPY=y
+        """
+
+    def test_run(self):
+        # Prepare the disk image.
+        disk_file = os.path.join(self.builddir, "images", "disk.img")
+        self.emulator.logfile.write(f"Creating disk image: {disk_file}\n")
+        self.emulator.logfile.flush()
+        subprocess.check_call(
+            ["dd", "if=/dev/zero", f"of={disk_file}", "bs=1M", "count=256"],
+            stdout=self.emulator.logfile,
+            stderr=self.emulator.logfile)
+
+        # Run the emulator with a blank drive.
+        img = os.path.join(self.builddir, "images", "rootfs.cpio.gz")
+        kern = os.path.join(self.builddir, "images", "Image")
+        bootargs = ["console=ttyAMA0"]
+        qemu_opts = ["-M", "virt", "-cpu", "cortex-a57", "-m", "256M",
+                     "-initrd", img,
+                     "-drive", f"file={disk_file},if=virtio,format=raw"]
+        self.emulator.boot(arch="aarch64",
+                           kernel=kern,
+                           kernel_cmdline=bootargs,
+                           options=qemu_opts)
+        self.emulator.login()
+
+        # Variables for this test.
+        dev = "/dev/vda"
+        label = "BR_TEST"
+        mnt_pt = "/tmp/vfat"
+        data_file = f"{mnt_pt}/data.bin"
+
+        # We create the vfat filesystem on our device.
+        self.assertRunOk(f"mkfs.vfat {dev}")
+
+        # We set a label on this filesystem.
+        self.assertRunOk(f"fatlabel {dev} '{label}'")
+
+        # We create a mount point and mount this filesystem.
+        self.assertRunOk(f"mkdir -p {mnt_pt}")
+        self.assertRunOk(f"mount {dev} {mnt_pt}")
+
+        # We create a file with random data, to use this new
+        # filesystem a bit.
+        self.assertRunOk(f"dd if=/dev/urandom of={data_file} bs=1M count=10")
+
+        # We compute the sha256 hash and save it for later.
+        hash_cmd = f"sha256sum {data_file}"
+        out, ret = self.emulator.run(hash_cmd)
+        self.assertEqual(ret, 0)
+        data_sha256 = out[0]
+
+        # We unmount the filesystem.
+        self.assertRunOk(f"umount {mnt_pt}")
+
+        # We run a filesystem check. Since we cleanly unmounted the
+        # filesystem, we are not expecting any repair. This is just to
+        # test the program works correctly.
+        self.assertRunOk(f"fsck.vfat -v {dev}")
+
+        # We query the label and check it is the one we set at the
+        # beginning.
+        out, ret = self.emulator.run(f"fatlabel {dev}")
+        self.assertEqual(ret, 0)
+        self.assertEqual(out[0], label)
+
+        # We remount our filesystem.
+        self.assertRunOk(f"mount {dev} {mnt_pt}")
+
+        # We should recompute the same sha256 hash as before, on the
+        # first data file we created at the beginning.
+        out, ret = self.emulator.run(hash_cmd)
+        self.assertEqual(ret, 0)
+        self.assertEqual(out[0], data_sha256)
diff --git a/support/testing/tests/package/test_dosfstools/linux-vfat.fragment b/support/testing/tests/package/test_dosfstools/linux-vfat.fragment
new file mode 100644
index 0000000000..eb4d2e6044
--- /dev/null
+++ b/support/testing/tests/package/test_dosfstools/linux-vfat.fragment
@@ -0,0 +1,3 @@ 
+CONFIG_VFAT_FS=y
+CONFIG_NLS_CODEPAGE_437=y
+CONFIG_NLS_ISO8859_1=y