This focuses on Rust packages, since the most commonly used argument
parser library (clap/structopt) makes the following pattern natural and
thus common:
postInstall = ''
installShellCompletion --cmd foo \
--bash <($out/bin/foo completion bash) \
…
This commit just guards those with
lib.optionalString (stdenv.buildPlatform.canExecute stdenv.hostPlatform)
splitting the string where unrelated actions are performed.
Otherwise references to the Python interpreter inside the set are wrong, as demonstrated by:
``` nix
with import <nixpkgs> { };
let
python' = python3.override {
packageOverrides = final: prev: { requests = prev.requests.overridePythonAttrs(old: { version = "1337"; }); };
};
in python'.pkgs.python.pkgs.requests
```
which returns the _non_ overriden requests.
And the same with `self`:
```
with import <nixpkgs> { };
let
python' = python3.override {
self = python';
packageOverrides = final: prev: { requests = prev.requests.overridePythonAttrs(old: { version = "1337"; }); };
};
in python'.pkgs.python.pkgs.requests
```
which returns the overriden requests.
This can manifest itself as file collisions when constructing environments or as subtly incorrect dependency graphs.
Lore overrides have been included with binlore's source up to now, but
this hasn't worked very well. (It isn't as easy to self-service for
people working in nixpkgs, and its use of partial pnames for matching
breaks down around some edge cases like version numbers appearing
early in perl pnames, or multiple packages having identical pnames.)
This is done with the following bash script:
```
#!/usr/bin/env bash
process_line() {
local filename=${1%:}
if [[ $4 =~ \"(.*)\"\; ]]; then
local sha256="${BASH_REMATCH[1]}"
fi
[[ -z $sha256 ]] && return 0
local hash=$(nix hash to-sri --type sha256 $sha256)
echo "Processing: $filename"
echo " $sha256 => $hash"
sed -i "s|cargoSha256 = \"$sha256\"|cargoHash = \"$hash\"|"
$filename
}
# split output by line
grep -r 'cargoSha256 = ' . | while IFS= read -r line; do
# split them further by space
read -r -a parts <<< "$line"
process_line "${parts[@]}"
done
```
This was achieved using the following command:
sd 'wrapGAppsHook\b' wrapGAppsHook3 (rg -l 'wrapGAppsHook\b')
And then manually reverted the following changes:
- alias in top-level.nix
- function name in wrap-gapps-hook.sh
- comment in postFixup of at-spi2-core
- comment in gtk4
- comment in preFixup of 1password-gui/linux.nix
- comment in postFixup of qgis/unwrapped-ltr.nix and qgis/unwrapped.nix
- comment in postFixup of telegram-desktop
- comment in postFixup of fwupd
- buildCommand of mongodb-compass
- postFixup of xflux-gui
- comment in a patch in kdePackages.kde-gtk-config and plasma5Packages.kde-gtk-config
- description of programs.sway.wrapperFeatures.gtk NixOS option (manual rebuild)
