Commits on Sep 14, 2022

1. Add fish suport to installer …

   Before this patch, installing Nix using the Fish shell did not
   work because Fish wasn't configured to add Nix to the PATH. Some
   options in NixOS#1512 offered workarounds, but they typically involve
   extra plugins or packages.
   
   This patch adds native, out-of-the-box support for the Fish shell.
   
   Note that Fish supports a `conf.d` directory, which is intended
   for exactly use cases like this: software projects distributing
   shell snippets. This patch takes advantage of it. The installer
   doesn't append any Nix loader behavior to any Fish config file.
   Because of that, the uninstall process is smooth and a reinstall
   obliterates the existing nix.fish files that we place instead of
   bothering the user with a backup / manual removal.
   
   Both single-user and multi-user cases are covered. It has been
   tested on Ubuntu, and a Mac with MacPorts, homebrew, and the
   Fish installer pkg.
   
   Closes NixOS#1512
   
   Co-authored-by: Graham Christensen <[email protected]>
   (cherry picked from commit 8ebdbeb)

   

   Hoverbear authored and grahamc committed Sep 14, 2022
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2. Add installer_test matrix for shells …

   Signed-off-by: Ana Hobden <[email protected]>
   (cherry picked from commit 7194c87)

   

   Hoverbear authored and grahamc committed Sep 14, 2022
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