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Merge pull request #4420 from jdufresne/which

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Simplify command discovery with stdlib shutil.which()
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Andrew Murray 2020-02-15 10:23:04 +11:00 committed by GitHub
commit 9174a4596c
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1 changed files with 11 additions and 21 deletions
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32
Tests/helper.py
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@ -4,6 +4,7 @@ Helper functions.
import logging import logging
import os import os
import shutil
import subprocess import subprocess
import sys import sys
import tempfile import tempfile
@ -191,9 +192,12 @@ class PillowTestCase(unittest.TestCase):
raise OSError() raise OSError()
outfile = self.tempfile("temp.png") outfile = self.tempfile("temp.png")
if command_succeeds([IMCONVERT, f, outfile]): rc = subprocess.call(
return Image.open(outfile) [IMCONVERT, f, outfile], stdout=subprocess.DEVNULL, stderr=subprocess.STDOUT
raise OSError() )
if rc:
raise OSError
return Image.open(outfile)
@unittest.skipIf(sys.platform.startswith("win32"), "requires Unix or macOS") @unittest.skipIf(sys.platform.startswith("win32"), "requires Unix or macOS")
@ -268,34 +272,20 @@ def hopper(mode=None, cache={}):
return im.copy() return im.copy()
def command_succeeds(cmd):
"""
Runs the command, which must be a list of strings. Returns True if the
command succeeds, or False if an OSError was raised by subprocess.Popen.
"""
try:
subprocess.call(cmd, stdout=subprocess.DEVNULL, stderr=subprocess.STDOUT)
except OSError:
return False
return True
def djpeg_available(): def djpeg_available():
return command_succeeds(["djpeg", "-version"]) return bool(shutil.which("djpeg"))
def cjpeg_available(): def cjpeg_available():
return command_succeeds(["cjpeg", "-version"]) return bool(shutil.which("cjpeg"))
def netpbm_available(): def netpbm_available():
return command_succeeds(["ppmquant", "--version"]) and command_succeeds( return bool(shutil.which("ppmquant") and shutil.which("ppmtogif"))
["ppmtogif", "--version"]
)
def imagemagick_available(): def imagemagick_available():
return IMCONVERT and command_succeeds([IMCONVERT, "-version"]) return bool(IMCONVERT and shutil.which(IMCONVERT))
def on_appveyor(): def on_appveyor():