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pdm 1.5.0 doesn't install from sdist via pip

See original GitHub issue

I have searched the issue tracker and believe that this is not a duplicate.

Make sure you run commands with -v flag before pasting the output.

Steps to reproduce

pip install pdm==1.5.0 --no-cache-dir --no-binary :all:

Actual behavior

Collecting pdm==1.5.0
  Downloading pdm-1.5.0.tar.gz (149 kB)
     |████████████████████████████████| 149 kB 7.0 MB/s
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
    Preparing wheel metadata ... done
  WARNING: Generating metadata for package pdm produced metadata for project name unknown. Fix your #egg=pdm fragments.
WARNING: Discarding https://files.pythonhosted.org/packages/35/61/f7c37dd26c810ef14b1fba95935c8c2be4240f1643d0a9d81a98b95115c6/pdm-1.5.0.tar.gz#sha256=6a9a16b10016b35c1900843906512fb549f2c1059a5789acaa9b23982b5f7e37 (from https://pypi.org/simple/pdm/) (requires-python:>=3.7). Requested unknown from https://files.pythonhosted.org/packages/35/61/f7c37dd26c810ef14b1fba95935c8c2be4240f1643d0a9d81a98b95115c6/pdm-1.5.0.tar.gz#sha256=6a9a16b10016b35c1900843906512fb549f2c1059a5789acaa9b23982b5f7e37 has inconsistent name: filename has 'pdm', but metadata has 'UNKNOWN'
ERROR: Could not find a version that satisfies the requirement pdm==1.5.0
ERROR: No matching distribution found for pdm==1.5.0