zsh unable to load rez context properly

[legomir]

When executing rez-env my_package in zsh rez is unable to load context of package even though some sort of child shell is created. The same thing works however when using bash. More in thread on slack: https://academysoftwarefdn.slack.com/archives/C0321B828FM/p1767119865724849

Environment

• MacOS
• "3.3.0"
• 3.11

To Reproduce

1. cd ~
2. touch .zshenv
3. rez-env

Expected behavior
Rez load created context

Actual behavior
New shell created but nothing happens.

[legomir]

I found what was causing the issue(with some help from JC) but it's little hard to follow and is zsh specific. So:

1. rez-env creates temp directory with rez_context.sh, context.sh, context.rtx, .zprofile, .zshenv, .zshrc files
2. rez_context.sh is sourced which set temporary HOME execute /bin/zsh which in turn execute dot files inside of temp dir
3. according to this post order of execution is: .zshenv → .zprofile → .zshrc → .zlogin → .zlogout which is different from how things works in bash in particular .zshenv executes ahead of .zshrc and .zprofile only execute for login shell
4. autogenerated .zshenv looks something like this:

#!/bin/zsh
export HOME="/Users/user_name"
. "/Users/user_name/.zshenv"

and line that cause problem is:
export HOME="/Users/user_name"
as we carry directly from .zshenv to .zshrc this cause skipping rez generated .zshrc which source context.sh and going directly to ~/.zshrc removing this line should make it work.

[legomir]

Another post: https://superuser.com/questions/1840395/complete-overview-of-bash-and-zsh-startup-files-sourcing-order that contains graphs for startup sequence:

• bash
• zsh

[legomir]

This could be a problem with Rust which puts in .zshenv:

. "$HOME/.cargo/env"

[JeanChristopheMorinPerso]

Thanks for this great investigative work @legomir! For reference, here are the docs on startup files for zsh: https://zsh.sourceforge.io/Doc/Release/Files.html.

[legomir]

Seems like $ZDOTDIR might solve all of this but requires logic different than all other UnixShell could be useful if anyone would add fish support in future ;)

[legomir]

From what I see $HOME hack is defined quite hight in parent class so this could require some bigger changes: https://github.com/AcademySoftwareFoundation/rez/blob/main/src/rez/shells.py#L452