Writing failed: [Errno 2] No such file or directory: '/home/user/.cache/black/21.11b1/tmpb3yqz52h'

[avatar-lavventura]

When I update black, or have a clean install I keep seeing following message:

load_grammar()] Generating grammar tables from /home/alper/venv/lib/python3.8/site-packages/blib2to3/Grammar.txt
load_grammar()] Writing grammar tables to /home/alper/.cache/black/21.11b1/Grammar3.8.10.final.0.pickle
load_grammar()] Writing failed: [Errno 2] No such file or directory: '/home/alper/.cache/black/21.11b1/tmpnwk07_xq'
load_grammar()] Generating grammar tables from /home/alper/venv/lib/python3.8/site-packages/blib2to3/PatternGrammar.txt
load_grammar()] Writing grammar tables to /home/alper/.cache/black/21.11b1/PatternGrammar3.8.10.final.0.pickle
load_grammar()] Writing failed: [Errno 2] No such file or directory: '/home/alper/.cache/black/21.11b1/tmpb3yqz52h'

I always have to do: mkdir /home/user/.cache/black/21.11b1, where could it be done automatically by the black?

How can I prevent this error from showing up? Would it be possible to for black to force create /home/user/.cache/black/21.* folders after each upgrade?

[michaelaye]

black should be allowed to do what it needs to do inside its own .cache/black folder, right?

[avatar-lavventura]

@michaelaye Hm I believe black should be allowed to create files inside .cache/black folder. I think the problem was cache grammar tables are tried to be generated before the 21.11b1 folder is created, which was causing the error messages.

I think this is resolved with the mentioned commit.

[michaelaye]

Well #2702 was closed with the comment that the issue would not be picked up for a while, so it’s not resolved, it seems.

[avatar-lavventura]

Ah you are right, I misread it, seems like PR is not resolved :-(

During the installation of black I tried to come up with this simple hack but the origin of the problem remains.

sudo chown $(logname) -R $HOME/.cache/black
black_version=$(pip freeze | grep black | sed 's|black==||g')
if [ "$black_version" != "" ]; then
    rm -rf $HOME/.cache/black/*
    mkdir -p $HOME/.cache/black/$black_version
fi