opam env does not recalculate all paths correctly when local switch is moved

[yawaramin]

Steps to reproduce:

$ pwd
/Users/yawar/src
$ mkdir reloc
$ cd reloc
$ opam switch create . 4.14.1
$ opam env

Output shows all paths starting with /Users/yawar/src/reloc/_opam, which is correct. But then if we move the directory:

$ cd ..
$ mv reloc reloc2
$ cd reloc2
$ opam env

Output shows that only OPAM_SWITCH_PREFIX is recalculated correctly i.e. /Users/yawar/src/reloc2/_opam. The paths in the other variables (CAML_LD_LIBRARY_PATH, OCAML_TOPLEVEL_PATH, PATH) all still start with /Users/yawar/src/reloc/_opam.

Expected behaviour: opam should leverage the correct OPAM_SWITCH_PREFIX value and interpolate it into the other variables.

[dra27]

See #3411, #3413 and #5417 🙂