42 lines
1.7 KiB
Rust
42 lines
1.7 KiB
Rust
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use std::os::unix::process::CommandExt;
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use std::ffi::OsStr;
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use std::os::unix::ffi::{OsStringExt, OsStrExt};
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pub fn args_for_exec(current_prog_name: &str, no_of_positional_args: usize) -> (Vec<Vec<u8>>, Vec<Vec<u8>>) {
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let mut args = std::env::args_os();
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// remove argv[0]
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let _ = args.nth(0);
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let mut args = args.map(|arg| arg.into_vec());
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let mut pos_args = vec![];
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// get positional args
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for i in 1..no_of_positional_args {
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pos_args.push(
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args.nth(0).expect(
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&format!("{}: expects {} positional args, only got {}", current_prog_name, no_of_positional_args, i))
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);
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}
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// prog... is the rest of the iterator
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let prog : Vec<Vec<u8>> = args.collect();
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(pos_args, prog)
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}
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pub fn exec_into_args<'a, 'b, Args, Arg, Env, Key, Val>(current_prog_name: &str, args: Args, env_additions: Env) -> !
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where
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Args: IntoIterator<Item = Arg>,
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Arg: AsRef<[u8]>,
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Env: IntoIterator<Item = (Key, Val)>,
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Key: AsRef<[u8]>,
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Val: AsRef<[u8]>,
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{
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// TODO: is this possible without collecting into a Vec first, just leaving it an IntoIterator?
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let args = args.into_iter().collect::<Vec<Arg>>();
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let mut args = args.iter().map(|v| OsStr::from_bytes(v.as_ref()));
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let prog = args.nth(1).expect(&format!("{}: first argument must be an executable", current_prog_name));
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// TODO: same here
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let env = env_additions.into_iter().collect::<Vec<(Key, Val)>>();
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let env = env.iter().map(|(k,v)| (OsStr::from_bytes(k.as_ref()), OsStr::from_bytes(v.as_ref())));
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let err = std::process::Command::new(prog).args(args).envs(env).exec();
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panic!("{}: exec failed: {:?}", current_prog_name, err);
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}
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