pip3 install error

$ git clone https://github.com/fyookball/electrum
$ cd electrum
$ pip3 install .
...
  Running setup.py install for Electron-Cash ... error
    Complete output from command /usr/bin/python3 -u -c "import setuptools, tokenize;__file__='/tmp/pip-x5v44czd-build/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-fp8gqsul-record/install-record.txt --single-version-externally-managed --compile --user --prefix=:
    usage: -c [--root= dir] [--prefix= prefix]
    -c: error: argument --prefix=: expected one argument
    
    ----------------------------------------
Command "/usr/bin/python3 -u -c "import setuptools, tokenize;__file__='/tmp/pip-x5v44czd-build/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-fp8gqsul-record/install-record.txt --single-version-externally-managed --compile --user --prefix=" failed with error code 2 in /tmp/pip-x5v44czd-build/

Why? The same procedure works well for electrum, electrum-ltc, electrum-dash… Morover they can use better pip3 install .[full] as well.

[ntninja]

@ser: Not everybody uses Ubuntu and not everybody uses the most recent version of everything.

@all: I looked at this and there where two issues, acutally:

• The value of --prefix was empty, causing an argument parsing error – I fixed this by defaulting an empty value to / (This is what caused to installation error, but it only surfaced due to Debian patches afaik.)
• --user was ignored, if the called user somehow had access to /share or / (the resulting file paths) then a system-wide installation would have been attempted anyways – this is fixed by never considering a system-wise installation if --user is received

You can review the changes in #745. Please test that version @ser and report back whether is works for you.

[ser]

@alexander255 Thanks I can confirm it fixes the issue and pip3 install . works 👍