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How I use tmp-postgres

PATH="/usr/lib/postgresql/11/bin/:${PATH}" \
  cabal v2-repl \
  --build-depends tmp-postgres==
ghci> import Database.Postgres.Temp
ghci> db <- do { Right db <- start; print (toConnectionString db); return db }
"host=/tmp/tmp-postgres-socket-559194f2 dbname=postgres port=35013"
<do stuff with that information>
ghci> stop db

You have to make sure that inidb is on your PATH which it won’t be by default in Debian (nor Ubuntu, I think).