Use _OCRMYPDF_TEST_PATH for testing and .py stubs to simulate symlinks

src/ocrmypdf/exec/__init__.py

@@ -21,14 +21,35 @@ import logging
 import os
 import re
 import sys
+import shutil
 from collections.abc import Mapping
-from subprocess import PIPE, STDOUT, CalledProcessError, run
+from subprocess import PIPE, STDOUT, CalledProcessError, run as subprocess_run
 
 from ..exceptions import ExitCode, MissingDependencyError
 
 log = logging.Logger(__name__)
 
 
+def _get_program(args, env=None):
+    program = args[0]
+    test_path = env.get('_OCRMYPDF_TEST_PATH', '')
+    if test_path:
+        program = shutil.which(program, path=test_path)
+    return program
+
+
+def run(args, *, env=None, **kwargs):
+    if not env:
+        env = os.environ
+    program = _get_program(args, env)
+    if os.name == 'nt' and program.lower().endswith('.py'):
+        args = [sys.executable, program] + args[1:]
+    else:
+        args = [program] + args[1:]
+    log.debug(args)
+    return subprocess_run(args, env=env, **kwargs)
+
+
 def get_version(program, *, version_arg='--version', regex=r'(\d+(\.\d+)*)', env=None):
     "Get the version of the specified program"
     args_prog = [program, version_arg]

src/ocrmypdf/exec/ghostscript.py

@@ -26,13 +26,13 @@ from functools import lru_cache
 from io import BytesIO
 from os import fspath
 from pathlib import Path
-from subprocess import PIPE, run, CalledProcessError
+from subprocess import PIPE, CalledProcessError
 from shutil import which
 
 from PIL import Image
 
 from ..exceptions import SubprocessOutputError, MissingDependencyError
-from . import get_version
+from . import get_version, run
 
 gslog = logging.getLogger()
 
@@ -43,6 +43,7 @@ if os.name == 'nt':
         GS = which('gswin32c')
         if not GS:
             raise MissingDependencyError("Ghostscript (gswin64c or gswin32c)")
+    GS = Path(GS).stem
 
 
 @lru_cache(maxsize=1)

src/ocrmypdf/exec/jbig2enc.py

@@ -18,10 +18,10 @@
 """Interface to jbig2 executable"""
 
 from functools import lru_cache
-from subprocess import PIPE, run
+from subprocess import PIPE
 
 from ..exceptions import MissingDependencyError
-from . import get_version
+from . import get_version, run
 
 
 @lru_cache(maxsize=1)

src/ocrmypdf/exec/qpdf.py

@@ -19,9 +19,9 @@
 
 from functools import lru_cache
 from os import fspath
-from subprocess import PIPE, STDOUT, CalledProcessError, run
+from subprocess import PIPE, STDOUT, CalledProcessError
 
-from . import get_version
+from . import get_version, run
 
 
 @lru_cache(maxsize=1)

src/ocrmypdf/exec/tesseract.py

@@ -23,7 +23,7 @@ from collections import namedtuple
 from contextlib import suppress
 import logging
 from os import fspath
-from subprocess import PIPE, STDOUT, CalledProcessError, TimeoutExpired, run
+from subprocess import PIPE, STDOUT, CalledProcessError, TimeoutExpired
 
 from ..exceptions import (
     MissingDependencyError,
@@ -31,7 +31,7 @@ from ..exceptions import (
     TesseractConfigError,
 )
 from ..helpers import page_number, safe_symlink
-from . import get_version
+from . import get_version, run
 
 OrientationConfidence = namedtuple('OrientationConfidence', ('angle', 'confidence'))
 

src/ocrmypdf/exec/unpaper.py

@@ -22,7 +22,6 @@
 
 import os
 import shlex
-import subprocess
 from functools import lru_cache
 from subprocess import PIPE, STDOUT, CalledProcessError
 from tempfile import TemporaryDirectory
@@ -30,7 +29,7 @@ from tempfile import TemporaryDirectory
 from PIL import Image
 
 from ..exceptions import MissingDependencyError, SubprocessOutputError
-from . import get_version
+from . import get_version, run as external_run
 
 
 @lru_cache(maxsize=1)
@@ -77,7 +76,7 @@ def run(input_file, output_file, dpi, log, mode_args):
         # their unpaper arguments (whether intentionally or otherwise)
         args_unpaper.extend([input_pnm, output_pnm])
         try:
-            proc = subprocess.run(
+            proc = external_run(
                 args_unpaper,
                 check=True,
                 close_fds=True,