test: fs: Use shared generate_file from utils

test_fs/test_erofs.py and test_fs/test_squashfs/sqfs_common.py both
defined a generate_file() helper that writes a file of a given size
filled with 'x'. The two functions were functionally identical and
differed only in parameter names and docstrings.

Move the helper into the existing test/py/utils.py module, which is
the established home for generic test utilities (md5sum_file,
PersistentRandomFile, attempt_to_open_file). Update both call sites
to use it.

Signed-off-by: Aristo Chen <aristo.chen@canonical.com>
Reviewed-by: joaomarcos.costa@bootlin.com
Reviewed-by: Simon Glass <sjg@chromium.org>

test/py/tests/test_fs/test_erofs.py

@@ -6,19 +6,11 @@ import os
 import pytest
 import shutil
 import subprocess
+import utils
 
 EROFS_SRC_DIR = 'erofs_src_dir'
 EROFS_IMAGE_NAME = 'erofs.img'
 
-def generate_file(name, size):
-    """
-    Generates a file filled with 'x'.
-    """
-    content = 'x' * size
-    file = open(name, 'w')
-    file.write(content)
-    file.close()
-
 def make_erofs_image(build_dir):
     """
     Makes the EROFS images used for the test.
@@ -36,15 +28,15 @@ def make_erofs_image(build_dir):
     os.makedirs(root)
 
     # 4096: uncompressed file
-    generate_file(os.path.join(root, 'f4096'), 4096)
+    utils.generate_file(os.path.join(root, 'f4096'), 4096)
 
     # 7812: Compressed file
-    generate_file(os.path.join(root, 'f7812'), 7812)
+    utils.generate_file(os.path.join(root, 'f7812'), 7812)
 
     # sub-directory with a single file inside
     subdir_path = os.path.join(root, 'subdir')
     os.makedirs(subdir_path)
-    generate_file(os.path.join(subdir_path, 'subdir-file'), 100)
+    utils.generate_file(os.path.join(subdir_path, 'subdir-file'), 100)
 
     # symlink
     os.symlink('subdir', os.path.join(root, 'symdir'))

test/py/tests/test_fs/test_squashfs/sqfs_common.py

@@ -5,6 +5,7 @@
 import os
 import shutil
 import subprocess
+import utils
 
 """ standard test images table: Each table item is a key:value pair
 representing the output image name and its respective mksquashfs options.
@@ -66,19 +67,6 @@ def init_standard_table():
     for key, value in zip(STANDARD_TABLE.keys(), opts_list):
         STANDARD_TABLE[key] = value
 
-def generate_file(file_name, file_size):
-    """ Generates a file filled with 'x'.
-
-    Args:
-        file_name: the file's name.
-        file_size: the content's length and therefore the file size.
-    """
-    content = 'x' * file_size
-
-    file = open(file_name, 'w')
-    file.write(content)
-    file.close()
-
 def generate_sqfs_src_dir(build_dir):
     """ Generates the source directory used to make the SquashFS images.
 
@@ -107,20 +95,20 @@ def generate_sqfs_src_dir(build_dir):
 
     # 4096: minimum block size
     file_name = 'f4096'
-    generate_file(os.path.join(root, file_name), 4096)
+    utils.generate_file(os.path.join(root, file_name), 4096)
 
     # 5096: minimum block size + 1000 chars (fragment)
     file_name = 'f5096'
-    generate_file(os.path.join(root, file_name), 5096)
+    utils.generate_file(os.path.join(root, file_name), 5096)
 
     # 1000: less than minimum block size (fragment only)
     file_name = 'f1000'
-    generate_file(os.path.join(root, file_name), 1000)
+    utils.generate_file(os.path.join(root, file_name), 1000)
 
     # sub-directory with a single file inside
     subdir_path = os.path.join(root, 'subdir')
     os.makedirs(subdir_path)
-    generate_file(os.path.join(subdir_path, 'subdir-file'), 100)
+    utils.generate_file(os.path.join(subdir_path, 'subdir-file'), 100)
 
     # symlink (target: sub-directory)
     os.symlink('subdir', os.path.join(root, 'sym'))

test/py/utils.py

@@ -51,6 +51,19 @@ def md5sum_file(fn, max_length=None):
         data = fh.read(*params)
     return md5sum_data(data)
 
+def generate_file(file_name, file_size):
+    """ Generates a file filled with 'x'.
+
+    Args:
+        file_name: the file's name.
+        file_size: the content's length and therefore the file size.
+    """
+    content = 'x' * file_size
+
+    file = open(file_name, 'w')
+    file.write(content)
+    file.close()
+
 class PersistentRandomFile:
     """Generate and store information about a persistent file containing
     random data."""