Cannot detect archive format?

[mathpunk]

This may be a matter of me not being a very pythonic guy: Do you know what I should try if your installation instructions give me this result? (The --user is an attempt to avoid sudo-ing but I could also mess with some permissions.)

> pip install --index-url --user https://test.pypi.org/simple/ reretrieve 
Looking in indexes: --user
Collecting https://test.pypi.org/simple/
  Downloading https://test.pypi.org/simple/ (2.9MB)
     |████████████████████████████████| 2.9MB 445kB/s 
  ERROR: Cannot unpack file /tmp/pip-unpack-75hejztt/simple (downloaded from /tmp/pip-req-build-xex4v69_, content-type: text/html; charset=UTF-8); cannot detect archive format
ERROR: Cannot determine archive format of /tmp/pip-req-build-xex4v69_

[SalomonSmeke]

Hey @mathpunk could you give me some information about your system? OS and the like? I have only tested on MacOS thus far so it may be a problem for other OSs, would be valuable info.

python -V also would be nice.

[mathpunk]

Arch Linux, Python 3.7.4

[SalomonSmeke]

Thank you @mathpunk! Im pulling an arch docker image to try and reproduce.

Edit: Irrelevant

My initial suspicion was that your pip was aliased to a python2 legacy install but the error I get when I try that does not match this error at all.

Searching for similar issues online indicates to me the possibility that there is a problem because the package name reretrieve does not match the project name rere.

pypa/pip#5271

This issue is quite old and solved in newer versions of pip as far as I can tell.

Im going to continue pursuing the Arch docker image just to make double sure, but in the meanwhile:

Could you send me your pip version? pip -V?

[SalomonSmeke]

Nvm no need! The arch image reproduced first try.

Details of how I figured it out

[root@faeafbdb3216 /]# pip install --index-url --user https://test.pypi.org/simple/ reretrieve
Looking in indexes: --user
Collecting https://test.pypi.org/simple/
  Downloading https://test.pypi.org/simple/ (2.9MB)
     |████████████████████████████████| 2.9MB 5.4MB/s 
  ERROR: Cannot unpack file /tmp/pip-unpack-pxa_35ro/simple (downloaded from /tmp/pip-req-build-zquew_l_, content-type: text/html; charset=UTF-8); cannot detect archive format
ERROR: Cannot determine archive format of /tmp/pip-req-build-zquew_l_
WARNING: Url '--user/pip/' is ignored. It is either a non-existing path or lacks a specific scheme.

Removing --user fixed the problem immediately, however:

[root@faeafbdb3216 /]# pip install --index-url https://test.pypi.org/simple/ reretrieve
Looking in indexes: https://test.pypi.org/simple/
Collecting reretrieve
  Downloading https://test-files.pythonhosted.org/packages/77/1a/3c84db3310c151a5522fa743277ec2052db931dc7b82b38ebd2a4eeb460e/reretrieve-0.0.0.dev4-py3-none-any.whl
Requirement already satisfied: urllib3 in /usr/lib/python3.8/site-packages (from reretrieve) (1.25.7)
Collecting mypy (from reretrieve)
  Downloading https://test-files.pythonhosted.org/packages/ae/9a/4759af69a975ce75c7a6b2312ec63e9b1fd8d0f92753bf835b5d152b60ba/MyPy-0.0.1-py3-none-any.whl
Requirement already satisfied: requests in /usr/lib/python3.8/site-packages (from mypy->reretrieve) (2.22.0)
Requirement already satisfied: chardet>=3.0.2 in /usr/lib/python3.8/site-packages (from requests->mypy->reretrieve) (3.0.4)
Requirement already satisfied: idna>=2.5 in /usr/lib/python3.8/site-packages (from requests->mypy->reretrieve) (2.8)
Installing collected packages: mypy, reretrieve
Successfully installed mypy-0.0.1 reretrieve-0.0.0.dev4

so I tried installing a different package with the --user param and the custom test pypi index url:

[root@faeafbdb3216 /]# pip install --index-url --user https://test.pypi.org/simple/ ijson
Looking in indexes: --user
Collecting https://test.pypi.org/simple/
  Using cached https://test.pypi.org/simple/
  ERROR: Cannot unpack file /tmp/pip-unpack-v8ubdddw/simple (downloaded from /tmp/pip-req-build-xae5i9kt, content-type: text/html; charset=UTF-8); cannot detect archive format
ERROR: Cannot determine archive format of /tmp/pip-req-build-xae5i9kt

It appears the order of the parameters is the issue here. --user is being used as the --index-url instead of the actual url.

The following works for me on an arch setup similar to yours:
pip install --user --index-url https://test.pypi.org/simple/ reretrieve

could you try this out and let me know how it goes?

[SalomonSmeke]

Stale closing.