opam 2.2.0~alpha2: OPAMSWITCH does not work anymore

[eponier]

The reason is that the shell hook resets OPAMSWITCH to the empty string as soon as it is set. This is because opam env --shell=zsh --readonly (my shell is zsh) prints OPAMSWITCH=''; export OPAMSWITCH; as the first line.

Before, the same command did not print OPAMSWITCH. This seems to be a consequence of #5417.

[kit-ty-kate]

I’m personally unable to reproduce this locally with 2.2.0~alpha2. Could you show a reproducible test case if you can?

[eponier]

I turned off the shell hook to experiment. By default, opam env --shell=zsh --readonly 2> /dev/null <&- does not mention OPAMSWITCH. But if I type eval $(opam env --set-switch --switch switch2) (while global switch is switch1), opam env --shell=zsh --readonly 2> /dev/null <&- contains as the first line OPAMSWITCH=''; export OPAMSWITCH;.
If I just set OPAMSWITCH manually, this does not happen (but then I have an unsynchronized environment, and, strangely, this not not reported by opam).

[kit-ty-kate]

Mmh, indeed i can reproduce. Thanks for the report and the test-case.