google buildpack psycopg2-binary 错误：未找到 pg_config 可执行文件

这是我的requirements.txt中的 psycopg2-binary==2.8.3 # 通过 -r requests/base.in

我正在 docker 镜像中构建。我的印象是，如果我安装psycopg2-binary vs psycopg2我不应该安装额外的 postgresql 开发库。我错了吗？

pack build --builder=gcr.io/buildpacks/builder:v1 test-python

Collecting psycopg2-binary==2.8.3
  Downloading psycopg2-binary-2.8.3.tar.gz (378 kB)
    ERROR: Command errored out with exit status 1:
     command: /layers/google.python.runtime/python/bin/python3 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-z7z_l56l/psycopg2-binary_ddfc5ed05bb44cf4b7e2f14d634bd6ae/setup.py'"'"'; __file__='"'"'/tmp/pip-install-z7z_l56l/psycopg2-binary_ddfc5ed05bb44cf4b7e2f14d634bd6ae/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-vsc_2hlv
         cwd: /tmp/pip-install-z7z_l56l/psycopg2-binary_ddfc5ed05bb44cf4b7e2f14d634bd6ae/
    Complete output (23 lines):
    running egg_info
    creating /tmp/pip-pip-egg-info-vsc_2hlv/psycopg2_binary.egg-info
    writing /tmp/pip-pip-egg-info-vsc_2hlv/psycopg2_binary.egg-info/PKG-INFO
    writing dependency_links to /tmp/pip-pip-egg-info-vsc_2hlv/psycopg2_binary.egg-info/dependency_links.txt
    writing top-level names to /tmp/pip-pip-egg-info-vsc_2hlv/psycopg2_binary.egg-info/top_level.txt
    writing manifest file '/tmp/pip-pip-egg-info-vsc_2hlv/psycopg2_binary.egg-info/SOURCES.txt'
    
    Error: pg_config executable not found.
    
    pg_config is required to build psycopg2 from source.  Please add the directory
    containing pg_config to the $PATH or specify the full executable path with the
    option:
    
        python setup.py build_ext --pg-config /path/to/pg_config build ...
    
    or with the pg_config option in 'setup.cfg'.
    
    If you prefer to avoid building psycopg2 from source, please install the PyPI
    'psycopg2-binary' package instead.
    
    For further information please check the 'doc/src/install.rst' file (also at
    <http://initd.org/psycopg/docs/install.html>).

不，你没有错；我今天遇到了同样的问题，经过一番谷歌搜索后，我发现了这个（已解决）github问题：https://github.com/psycopg/psycopg2/issues/699# https://github.com/psycopg/psycopg2/issues/699#

那里的评论（https://github.com/psycopg/psycopg2/issues/699#issuecomment-377188700 https://github.com/psycopg/psycopg2/issues/699#issuecomment-377188700）表明问题的一个可能原因是使用过时的 pip 版本。

我使用的是 18.x 版本，升级后（python -m pip install -U pip，这让我得到了 pip 21.1.3），psycopg2-binary 的安装成功完成（如预期），即使我没有安装任何 postgres 开发库。