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Checks and installs pyusb and confirms compatibility with Latitude 7270 #19

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Checks and installs pyusb and confirms compatibility with Latitude 7270 #19

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21a791f
Added a check for pyusb at the start
Mar 12, 2022
2bf4b29
Added missing imports
Mar 12, 2022
9cb944d
Applied requested changes
Mar 31, 2022
c80a822
Now prints to stderr for any importErrors in usbhandler
Apr 2, 2022
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3 changes: 2 additions & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@ This project aims to enable Linux to read NFC cards the same way Windows does.
## Usage

1. Clone the repository.
1. Install python3 and python3-usb.
1. Install python3 and python3-usb ([pyusb](https://pypi.org/project/pyusb/#files)).
1. Run: `./nfc.py on` (use `sudo` if necessary).
1. Run `pcsc_scan` or whatever you prefer.
1. Enjoy!
Expand All @@ -36,6 +36,7 @@ Firmware update (done during driver installation on Windows) may be required.
* Dell Latitude 5310 2-in-1
* Dell Latitude 5480
* Dell Latitude 5491
* Dell Latitude 7270
* Dell Latitude 7280
* Dell Latitude 7290
* Dell Latitude 7390
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31 changes: 30 additions & 1 deletion nfc.py
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Expand Up @@ -2,7 +2,9 @@

import logging
import sys
import usb.core
import pkg_resources
import subprocess
#import usb.core imported later on in order to allow checking weather it is installed

class UsbDeviceMatcher:
def __init__(self, properties, handler):
Expand Down Expand Up @@ -60,6 +62,33 @@ def find(cls):
logging.basicConfig(level=logging.DEBUG)
logger = logging.getLogger(__name__)

logger.info("Checking for dependencies...")
if "pyusb" not in {pkg.key for pkg in pkg_resources.working_set}:
logger.info("pyusb is not available.")

if (input("Seems you are missing the required library \'pyusb\'.\nWould you like to install it now? (y/N): ") == 'y'):
try:
print("> pip install pyusb")
cp = subprocess.run(["pip", "install", "pyusb"], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
print(cp.stdout.decode())

except Exception as e:
print(str(e) + "\nERROR: There was a problem and the package could not be installed.\n"
"Try installing the library manually."
"More info here: https://pypi.org/project/pyusb/#files\n and here: https://github.com/walac/pyusb")
sys.exit()

print("Success: \'pyusb\' has been installed")

else:
logger.info("...permission denied")
sys.exit()

logger.info("pyusb is installed.")

# It is now safe to import usb
import usb.core

handler = UsbDeviceFinder.find()
if sys.argv[1] == 'on':
logger.info('Turning NFC on...')
Expand Down