Locale errors—in 2020!

[ghost]

After upgrading to Mercurial 5.4 and Python 3, I get the following on macOS:

hg root
Fatal Python error: config_get_locale_encoding: failed to get the locale encoding: nl_langinfo(CODESET) failed
Python runtime state: preinitialized

I have LANG=en_GB.UTF-8 in my ~/.profile and Python 3/Mercurial work from the command line, but not from VSCode.

[ghost]

I think this has something to do with the LC_CTYPE setting. On the command line LC_CTYPE=en_GB.UTF-8 and LC_CTYPE=UTF-8 work, but LC_CTYPE=en_GB causes the the error. In the terminal, by default, without anything having been touched, the middle one holds. So it seems either the extension is touching LC_CTYPE, or something in the way VSCode is loading the environment (doesn't matter where it's started from) messes up LC_CTYPE.

[ghost]

I tried to create a wrapper script, to check the environment, but hg.path does not seem to be respected.

[incidentist]

Fixed in 1.4.0.