package/python-pyfatfs: new package

This commit adds a new host package for python-pyfatfs, which is
needed by Snagboot.

Homepage: https://pypi.org/project/pyfatfs/

A small test doing some minimal verification that pyfatfs works is
also added.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>

support/testing/tests/package/test_python_pyfatfs.py

@@ -0,0 +1,53 @@
+import infra.basetest
+import os
+
+
+class TestHostPythonPyfatfs(infra.basetest.BRHostPkgTest):
+    hostpkgs = ["host-python-pyfatfs",
+                "host-genimage",
+                "host-dosfstools",
+                "host-mtools"]
+    config = infra.basetest.BASIC_TOOLCHAIN_CONFIG + infra.basetest.MINIMAL_CONFIG + \
+        """
+        BR2_PACKAGE_HOST_GENIMAGE=y
+        BR2_PACKAGE_HOST_DOSFSTOOLS=y
+        BR2_PACKAGE_HOST_MTOOLS=y
+        """
+
+    genimage_cfg = """
+image test.vfat {
+    vfat {
+        files = {
+            "test.txt"
+        }
+    }
+
+    size = 8M
+}"""
+
+    def test_run(self):
+        os.makedirs(os.path.join(self.builddir, "genimage-input"),
+                    exist_ok=True)
+        with open(os.path.join(self.builddir, "genimage-input", "test.txt"), "w") as f:
+            f.write("Hello World!")
+        with open(os.path.join(self.builddir, "genimage.cfg"), "w") as f:
+            f.write(self.genimage_cfg)
+        os.makedirs(os.path.join(self.builddir, "genimage-tmp"),
+                    exist_ok=True)
+        os.makedirs(os.path.join(self.builddir, "genimage-root"),
+                    exist_ok=True)
+
+        cmd = ["host/bin/genimage",
+               "--config", os.path.join(self.builddir, "genimage.cfg"),
+               "--outputpath", self.builddir,
+               "--inputpath", os.path.join(self.builddir, "genimage-input"),
+               "--tmppath", os.path.join(self.builddir, "genimage-tmp"),
+               "--rootpath", os.path.join(self.builddir, "genimage-root"),
+               "--mkdosfs", os.path.join(self.builddir, "host", "sbin", "mkdosfs"),
+               "--mcopy", os.path.join(self.builddir, "host", "bin", "mcopy")
+               ]
+        infra.run_cmd_on_host(self.builddir, cmd)
+
+        cmd = ["host/bin/python3", "-c",
+               "import fs; fatfs = fs.open_fs('fat://test.vfat'); assert(fatfs.listdir('/') == ['TEST.TXT'])"]
+        infra.run_cmd_on_host(self.builddir, cmd)