FAQ¶
Requests¶
Q: I'm getting an SSL Error when making a request to url containing cern.ch.
A: If you run into SSL errors with CERN websites, you might need the CERN certificate chain to sign the certificates correctly. Just add a verify keyword into your calls:
client.get(..., verify=itkdb.data / "CERN_chain.pem")
and it should work.
Q: How do I upload a file to EOS?
A: To upload a file to EOS, you need to install this package with the eos feature. Then refer to some examples for usage.
Q: I got an ImportError related to pycurl and libcurl. How do I fix this?
A: If you try running itkdb and run into an issue like:
Traceback (most recent call last):
...
ImportError: pycurl: libcurl link-time ssl backends (secure-transport, openssl) do not include compile-time ssl backend (none/other)
You will need to reinstall pycurl and force re-compilation. This can be done by first checking the config for curl on your machine:
$ curl-config --features
AsynchDNS
GSS-API
HTTPS-proxy
IPv6
Kerberos
Largefile
MultiSSL
NTLM
NTLM_WB
SPNEGO
SSL
UnixSockets
alt-svc
libz
and then setting the appropriate compile flags. For example, the above shows I have SSL enabled, if I have openssl then...
$ brew info openssl
...
...
For compilers to find openssl@3 you may need to set:
export LDFLAGS="-L/usr/local/opt/openssl@3/lib"
export CPPFLAGS="-I/usr/local/opt/openssl@3/include"
...
which tells me to export the above lines and then I can reinstall correctly:
$ export LDFLAGS="-L/usr/local/opt/openssl@3/lib"
$ export CPPFLAGS="-I/usr/local/opt/openssl@3/include"
$ python -m pip install --no-cache-dir --compile --ignore-installed --install-option="--with-openssl" pycurl
Assuming a virtual environment like
$ lsetup "views dev4 latest/x86_64-centos7-gcc11-opt"
$ python3 -m venv venv
$ source venv/bin/activate
I looked up the locations of the installations on lxplus for you already:
$ export LDFLAGS="-L/usr/local/lib/openssl"
$ export CPPFLAGS="-I/usr/local/include/openssl"
$ export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/lib/pkgconfig/
$ python -m pip install --no-cache-dir --compile --ignore-installed --install-option="--with-nss" pycurl
Assuming a virtual environment like
$ python3 -m venv venv
$ source venv/bin/activate
which came with python3.9 by default on swan, the installation flags needed are:
$ export LDFLAGS="-L/usr/lib64/openssl"
$ export CPPFLAGS="-I/usr/include/openssl"
$ export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/lib64/pkgconfig/
$ python -m pip install --no-cache-dir --compile --ignore-installed --install-option="--with-nss" pycurl
Additional note that if you have pip >= 23.0, you will need to modify the commands above to supply:
--no-use-pep517 --global-option="--with..."
instead of using --install-option which is deprecated in favor of --global-option, and disabling the use of PEP517 to allow the use of --global-option.
Potpourri¶
Q: I'm still stuck and I don't see my question here.
A: I'm still working on fleshing out the FAQs. Check back soon. In the meantime, file an issue.