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Add fish suport to installer

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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 #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 #1512

Co-authored-by: Graham Christensen <graham@grahamc.com>
This commit is contained in:
Ana Hobden 2022-09-07 11:58:25 -07:00 • committed by Graham Christensen
parent b8f334bd85
commit 8ebdbeb257
7 changed files with 145 additions and 6 deletions
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35
scripts/nix-profile-daemon.fish.in Normal file
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# Only execute this file once per shell.
if test -n "$__ETC_PROFILE_NIX_SOURCED"
return
end
set __ETC_PROFILE_NIX_SOURCED 1
set --export NIX_PROFILES "@localstatedir@/nix/profiles/default $HOME/.nix-profile"
# Set $NIX_SSL_CERT_FILE so that Nixpkgs applications like curl work.
if test -n "$NIX_SSH_CERT_FILE"
: # Allow users to override the NIX_SSL_CERT_FILE
else if test -e /etc/ssl/certs/ca-certificates.crt # NixOS, Ubuntu, Debian, Gentoo, Arch
set --export NIX_SSL_CERT_FILE /etc/ssl/certs/ca-certificates.crt
else if test -e /etc/ssl/ca-bundle.pem # openSUSE Tumbleweed
set --export NIX_SSL_CERT_FILE /etc/ssl/ca-bundle.pem
else if test -e /etc/ssl/certs/ca-bundle.crt # Old NixOS
set --export NIX_SSL_CERT_FILE /etc/ssl/certs/ca-bundle.crt
else if test -e /etc/pki/tls/certs/ca-bundle.crt # Fedora, CentOS
set --export NIX_SSL_CERT_FILE /etc/pki/tls/certs/ca-bundle.crt
else if test -e "$NIX_LINK/etc/ssl/certs/ca-bundle.crt" # fall back to cacert in Nix profile
set --export NIX_SSL_CERT_FILE "$NIX_LINK/etc/ssl/certs/ca-bundle.crt"
else if test -e "$NIX_LINK/etc/ca-bundle.crt" # old cacert in Nix profile
set --export NIX_SSL_CERT_FILE "$NIX_LINK/etc/ca-bundle.crt"
else
# Fall back to what is in the nix profiles, favouring whatever is defined last.
for i in $NIX_PROFILES
if test -e "$i/etc/ssl/certs/ca-bundle.crt"
set --export NIX_SSL_CERT_FILE "$i/etc/ssl/certs/ca-bundle.crt"
end
end
end
fish_add_path --prepend --global "@localstatedir@/nix/profiles/default/bin"
fish_add_path --prepend --global "$HOME/.nix-profile/bin"