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grub-reboot-rs
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env modification

Zynh0722 2024-05-15 05:13:15 -07:00
parent 7e2b76e125
commit 43fa18d819
3 changed files with 300 additions and 4 deletions
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230
Cargo.lock generated
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@ -2,6 +2,236 @@
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1
Cargo.toml
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@ -4,3 +4,4 @@ version = "0.1.0"
edition = "2021" edition = "2021"
[dependencies] [dependencies]
clap = { version = "4.5.4", features = ["derive"] }

73
src/main.rs
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@ -1,9 +1,50 @@
use std::{path::Path, process::exit}; use std::{error::Error, path::PathBuf, process::exit, str::FromStr};
use clap::Parser;
/// Set the default boot menu entry for GRUB, for the next boot only.
///
/// MENU_ENTRY is a number, a menu item title or a menu item identifier. Please note that menu
/// items in submenus or sub-submenus require specifying the submenu components and then the
/// menu item component. The titles should be separated using the greater-than character (>)
/// with no extra spaces. Depending on your shell some characters including > may need
/// escaping. More information about this is available in the GRUB Manual in the section about
/// the 'default' command.
#[derive(Parser, Debug)]
#[command(version, about, long_about)]
struct Args {
/// expect GRUB images under the directory DIR/grub instead of the /boot/grub directory
/// (required on windows)
#[arg(long)]
boot_directory: Option<PathBuf>,
/// The GRUB entr
menu_entry: String,
}
#[cfg(not(windows))]
const BOOT_PATH: &str = "/boot"; const BOOT_PATH: &str = "/boot";
fn main() { fn main() -> Result<(), Box<dyn Error>> {
let boot_folder = Path::new(BOOT_PATH); let args = Args::parse();
#[cfg(not(windows))]
let boot_folder = args
.boot_directory
.or_else(|| PathBuf::from_str(BOOT_PATH).ok());
#[cfg(not(windows))]
let boot_folder = unsafe { boot_folder.unwrap_unchecked() };
#[cfg(windows)]
if args.boot_directory.is_none() {
eprintln!("You must supply a boot-directory on windows; see --help");
exit(1);
}
#[cfg(windows)]
let boot_folder = unsafe { args.boot_directory.unwrap_unchecked() };
let grub_env = boot_folder.join("grub/grubenv"); let grub_env = boot_folder.join("grub/grubenv");
if !grub_env.exists() { if !grub_env.exists() {
@ -11,5 +52,29 @@ fn main() {
exit(1); exit(1);
} }
println!("{grub_env:?}"); let grub_env = std::fs::read_to_string(grub_env)?;
let lines = grub_env.lines().filter(|l| !l.chars().all(|c| c == '#'));
let modified_lines: Vec<String> = lines
.map(|l| {
let seperator_pos = l.find('=').unwrap_or(0usize);
if &l[..seperator_pos] == "next_entry" {
[l[..seperator_pos].to_owned(), args.menu_entry.clone()].join("=")
} else {
l.to_owned()
}
})
.collect();
let modified_env = modified_lines.join("\n");
let padding = "#".repeat(1023 - modified_env.bytes().len());
let padded_env = [modified_env, padding].join("\n");
println!("{}", padded_env);
println!("{}", padded_env.len());
Ok(())
} }