From 11df0f41fac90c0ee128afed235e0c9ecb71b6ba Mon Sep 17 00:00:00 2001 From: Zynh0722 Date: Wed, 15 May 2024 05:13:15 -0700 Subject: [PATCH] env modification --- Cargo.lock | 230 ++++++++++++++++++++++++++++++++++++++++++++++++++++ Cargo.toml | 1 + src/main.rs | 73 ++++++++++++++++- 3 files changed, 300 insertions(+), 4 deletions(-) diff --git a/Cargo.lock b/Cargo.lock index 14cc51d..164e475 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -2,6 +2,236 @@ # It is not intended for manual editing. version = 3 +[[package]] +name = "anstream" +version = "0.6.14" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "418c75fa768af9c03be99d17643f93f79bbba589895012a80e3452a19ddda15b" +dependencies = [ + "anstyle", + "anstyle-parse", + "anstyle-query", + "anstyle-wincon", + "colorchoice", + "is_terminal_polyfill", + "utf8parse", +] + +[[package]] +name = "anstyle" +version = "1.0.7" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = 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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, + + /// a number, a menu item title or a menu item identifier. + menu_entry: String, +} + +#[cfg(not(windows))] const BOOT_PATH: &str = "/boot"; -fn main() { - let boot_folder = Path::new(BOOT_PATH); +fn main() -> Result<(), Box> { + 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"); if !grub_env.exists() { @@ -11,5 +52,29 @@ fn main() { 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 = 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(()) }