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Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
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The hypothetical commands `show w' and `show c' should show the appropriate
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You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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# nutils
> ~~Utils so good, they make you nut~~ A collection of utilities for the [Nix package manager](https://github.com/NixOS/nix)
## Available Utilities
### nixfetch (WIP)
nixfetch fetches a file, adds it to the nix store and returns JSON data for the newly
added path: mainly the file path and the hash. It is ultimately a wrapper around
`nix store prefetch-file`. The nix store is used to avoid storing duplicates
of the same file.
## Building
You know how to use Rust, yes?
## Contributing
Do you know how to use Rust? I don't. Make a pull request if you find one of my many mistakes. You may unlock the
golden shelf skin at 99 mistakes found.
The repository follows a very simple structure: each utility must be its own workspace, and common functions
should go under the `commons` workspace.
### Adding new utilities
This is a monorepo for utility wrappers around the nix package manager, focusing on the package manager itself
rather than `nixos-rebuild` unlike the awesome [nh](https://github.com/viperml/nh) project. If you wish to add
an utility, feel free to.
## License
All workspaces in this repository are licensed under GPLv3 or above. See [LICENSE](LICENSE) for
details and restrictions.

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[package]
name = "flakecheck"
version = "0.1.0"
edition = "2021"

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use std::process::{Command, Stdio};
// TODO: nix flake check in later versions of nix cause a memory leak
// because nix sucks, whats new? find a way to run it inside a controlled
// environment where its memory usage is restricted, possibly via arguments
fn main() {
loop {
let output = Command::new("nix")
.arg("flake")
.arg("check")
.stdout(Stdio::piped())
.output()
.expect("Failed to execute command");
let stdout = String::from_utf8_lossy(&output.stdout);
let invalid_files: Vec<&str> = stdout
.lines()
.filter(|line| line.contains("is not valid"))
.map(|line| line.split('\'').nth(1).unwrap())
.collect();
if invalid_files.is_empty() {
break; // No invalid files found, exit loop
}
for path in &invalid_files {
println!("Repairing {}", path);
let _ = Command::new("sudo")
.arg("nix-store")
.arg("--repair-path")
.arg(path)
.stdout(Stdio::null())
.output();
}
}
}

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[package]
name = "nixfetch"
version = "0.1.0"
edition = "2021"
[dependencies]
structopt = "0.3"

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use std::path::PathBuf;
use std::process::Command;
use structopt::StructOpt;
#[derive(Debug, StructOpt)]
#[structopt(
name = "nixfetch",
about = "Add a file to /nix/store and output its path"
)]
struct Opt {
/// Print this help message
#[structopt(short = "h", long = "help")]
help: bool,
/// Set the file's executable bit
#[structopt(short = "x", long = "executable")]
executable: bool,
/// Unpack the file (url can also be a flakeref)
#[structopt(long = "unpack")]
unpack: bool,
/// The URL of the file to fetch
url: String,
}
pub fn fetch_file(url: &str, unpack: bool, executable: bool) -> Result<PathBuf, String> {
let mut command = Command::new("nix");
if unpack {
command.arg("flake").arg("prefetch").arg("--json");
} else {
command.arg("store").arg("prefetch-file").arg("--json");
if executable {
command.arg("--executable");
}
}
command.arg(url);
let output = command
.output()
.map_err(|e| format!("Error executing command: {}", e))?;
if !output.status.success() {
return Err(format!(
"Error: {}",
String::from_utf8_lossy(&output.stderr).trim()
));
}
let storepath = String::from_utf8_lossy(&output.stdout).trim().to_string();
Ok(PathBuf::from(storepath))
}
fn main() {
let opt = Opt::from_args();
if opt.help {
Opt::clap().print_help().unwrap();
return;
}
if opt.url.is_empty() {
eprintln!("Error: No URL provided.");
Opt::clap().print_help().unwrap();
std::process::exit(125);
}
if opt.executable && opt.unpack {
eprintln!("Error: -x/--executable and --unpack cannot be used together.");
Opt::clap().print_help().unwrap();
std::process::exit(125);
}
let storepath = fetch_file(&opt.url, opt.unpack, opt.executable).unwrap_or_else(|err| {
eprintln!("Error: {}", err);
std::process::exit(1);
});
println!("{}", storepath.display());
}