reduced usage of os.chdir() in Python scripts (#6510)

Author: firewave

htmlreport/cppcheck-htmlreport

@@ -441,9 +441,8 @@ def git_blame(errors, path, file, blame_options):
     full_path = os.path.join(path, file)
     path, filename = os.path.split(full_path)
 
-    cwd = os.getcwd()
-    if path:
-        os.chdir(path)
+    if not path:
+        path = None  # make sure this is None
 
     cmd_args = ['git', 'blame', '-L %d,%d' % (first_line, last_line)]
     if '-w' in blame_options:
@@ -453,12 +452,10 @@ def git_blame(errors, path, file, blame_options):
     cmd_args = cmd_args + ['--porcelain', '--incremental', '--', filename]
 
     try:
-        result = subprocess.check_output(cmd_args)
+        result = subprocess.check_output(cmd_args, cwd=path)
         result = result.decode(locale.getpreferredencoding())
     except:
         return []
-    finally:
-        os.chdir(cwd)
 
     if result.startswith('fatal'):
         return []
@@ -704,7 +701,6 @@ def main() -> None:
         parser.error('No report directory set.')
 
     # Get the directory where source code files are located.
-    cwd = os.getcwd()
     source_dir = os.getcwd()
     if options.source_dir:
         source_dir = options.source_dir
@@ -990,7 +986,6 @@ def main() -> None:
         sys.stderr.write("\nConsider changing source-encoding (for example: \"htmlreport ... --source-encoding=\"iso8859-1\"\"\n")
 
     print('Creating style.css file')
-    os.chdir(cwd)       # going back to the cwd to find style.css
     with io.open(os.path.join(options.report_dir, 'style.css'), 'w') as css_file:
         css_file.write(STYLE_FILE)
 

tools/test-my-pr.py

@@ -52,7 +52,7 @@ def format_float(a, b=1):
     main_dir = os.path.join(work_path, 'tree-main')
 
     lib.set_jobs('-j' + str(args.j))
-    result_file = os.path.join(work_path, args.o)
+    result_file = os.path.abspath(os.path.join(work_path, args.o))
     (f, ext) = os.path.splitext(result_file)
     timing_file = f + '_timing' + ext
     your_repo_dir = os.path.dirname(os.path.dirname(os.path.abspath(sys.argv[0])))
@@ -75,8 +75,7 @@ def format_float(a, b=1):
         sys.exit(1)
 
     try:
-        os.chdir(your_repo_dir)
-        commit_id = (subprocess.check_output(['git', 'merge-base', 'origin/main', 'HEAD'])).strip().decode('ascii')
+        commit_id = (subprocess.check_output(['git', 'merge-base', 'origin/main', 'HEAD'], cwd=your_repo_dir)).strip().decode('ascii')
         with open(result_file, 'a') as myfile:
             myfile.write('Common ancestor: ' + commit_id + '\n\n')
         package_width = '140'
@@ -85,7 +84,6 @@ def format_float(a, b=1):
             myfile.write('{:{package_width}} {:{timing_width}} {:{timing_width}} {:{timing_width}}\n'.format(
                 'Package', 'main', 'your', 'Factor', package_width=package_width, timing_width=timing_width))
 
-        os.chdir(main_dir)
         subprocess.check_call(['git', 'fetch', '--depth=1', 'origin', commit_id])
         subprocess.check_call(['git', 'checkout', '-f', commit_id])
     except BaseException as e: