This fixes a few problems with the assume script in the granted package.
- assume is currently being exec'ed by a wrapper script created with
wrapProgram, but it should be sourced. This causes the error:
```
line 172: return: can only `return' from a function or sourced script
```
- assume inspects argv[0] to check if an alias has been added to the
user's shell profile. This means a wrapper of any kind won't work,
even if it called source instead of exec, because source will still
set argv[0]. This means assume always tries to add the alias, but it
fails when it has already added the alias.
```
[i] To assume roles with Granted, we need to add an alias to your shell profile (https://docs.commonfate.io/granted/internals/shell-alias)
? Install zsh alias at /Users/matthew/.zshenv Yes
[✘] the Granted alias has already been added to /Users/matthew/.zshenv
```
- assume depends on assumego, so if it is run directly from e.g. a
result directory created with `nix build`, it will output
```
line 22: assumego: command not found
```
Fix all of these problems by dropping the wrapper around assume, and
instead insert a few lines into the start of the assume script that add
xdg-utils and granted to assume's PATH.
In preparation for the deprecation of `stdenv.isX`.
These shorthands are not conducive to cross-compilation because they
hide the platforms.
Darwin might get cross-compilation for which the continued usage of `stdenv.isDarwin` will get in the way
One example of why this is bad and especially affects compiler packages
https://www.github.com/NixOS/nixpkgs/pull/343059
There are too many files to go through manually but a treewide should
get users thinking when they see a `hostPlatform.isX` in a place where it
doesn't make sense.
```
fd --type f "\.nix" | xargs sd --fixed-strings "stdenv.is" "stdenv.hostPlatform.is"
fd --type f "\.nix" | xargs sd --fixed-strings "stdenv'.is" "stdenv'.hostPlatform.is"
fd --type f "\.nix" | xargs sd --fixed-strings "clangStdenv.is" "clangStdenv.hostPlatform.is"
fd --type f "\.nix" | xargs sd --fixed-strings "gccStdenv.is" "gccStdenv.hostPlatform.is"
fd --type f "\.nix" | xargs sd --fixed-strings "stdenvNoCC.is" "stdenvNoCC.hostPlatform.is"
fd --type f "\.nix" | xargs sd --fixed-strings "inherit (stdenv) is" "inherit (stdenv.hostPlatform) is"
fd --type f "\.nix" | xargs sd --fixed-strings "buildStdenv.is" "buildStdenv.hostPlatform.is"
fd --type f "\.nix" | xargs sd --fixed-strings "effectiveStdenv.is" "effectiveStdenv.hostPlatform.is"
fd --type f "\.nix" | xargs sd --fixed-strings "originalStdenv.is" "originalStdenv.hostPlatform.is"
```
Reproduction script:
# Bulk rewrite
./maintainers/scripts/sha-to-sri.py pkgs/by-name
# Revert some packages which will need manual intervention
for n in amdvlk azure-cli cargo-profiler corefonts flatito fluxcd gist perf_data_converter protoc-gen-js solana-cli swt verible; do
git checkout -- "pkgs/by-name/${n:0:2}/${n}"
done
