@gerhard thanks for the gentle nudge – I re-ran from absolute scratch (git clone onward) while adding gem 'sqlite3' to the end of /src/Gemfile, since I assumed this was the one you meant, and it worked! For the record here are the instructions I used (for mne_analysis listserv):
1. In Ubuntu host
git clone https://github.com/discourse/discourse.git
cd discourse
d/boot_dev --init
d/rails db:migrate RAILS_ENV=development
d/shell
vim /src/Gemfile # add gem 'sqlite3' to end
exit
d/bundle
2. In docker shell
sudo mkdir -p /shared/import/data
sudo chown -R discourse:discourse /shared/import
wget -r -l1 --no-parent --no-directories "https://mail.nmr.mgh.harvard.edu/pipermail//mne_analysis/" -P /shared/import/data/mne_analysis -A "*-*.txt.gz"
rm /shared/import/data/mne_analysis/robots.txt.tmp
gzip -d /shared/import/data/mne_analysis/*.txt.gz
wget https://gist.githubusercontent.com/larsoner/940cd6c7100b87c4c5668cb0bc540afb/raw/9e78513620d11355ad0e10f4a2470996c26ebc8c/mailmanToMBox.py -O ~/mailmanToMBox.py
python3 ~/mailmanToMBox.py /shared/import/data/mne_analysis/
rm /shared/import/data/mne_analysis/*.txt
sudo apt install -y libsqlite3-dev # no-op for me
# check results
cat /shared/import/data/mne_analysis/*.mbox > ~/all.mbox
sudo apt install -y procmail
mkdir -p ~/split
export FILENO=0000
formail -ds sh -c 'cat > ~/split/msg.$FILENO' < ~/all.mbox
rm -rf ~/split ~/all.mbox
# settings
wget https://raw.githubusercontent.com/discourse/discourse/master/script/import_scripts/mbox/settings.yml -O /shared/import/settings.yml
# run it
cd /src
bundle exec ruby script/import_scripts/mbox.rb /shared/import/settings.yml
This had a bunch of informative output, and at the end:
...
Updating featured topics in categories
5 / 5 (100.0%) [6890 items/min] ]
Resetting topic counters
Done (00h 06min 21sec)
Then exiting and on the Ubuntu host:
d/unicorn &
google-chrome http://0.0.0.0:9292
Done!
I’ll probably tweak the settings to get rid of the [Mne_analysis] prefix, but I’m thrilled it’s working this well already!