diff options
Diffstat (limited to 'users/Profpatsch/execline/exec_helpers.rs')
-rw-r--r-- | users/Profpatsch/execline/exec_helpers.rs | 149 |
1 files changed, 0 insertions, 149 deletions
diff --git a/users/Profpatsch/execline/exec_helpers.rs b/users/Profpatsch/execline/exec_helpers.rs deleted file mode 100644 index a57cbca35391..000000000000 --- a/users/Profpatsch/execline/exec_helpers.rs +++ /dev/null @@ -1,149 +0,0 @@ -use std::ffi::OsStr; -use std::os::unix::ffi::{OsStrExt, OsStringExt}; -use std::os::unix::process::CommandExt; - -pub fn no_args(current_prog_name: &str) -> () { - let mut args = std::env::args_os(); - // remove argv[0] - let _ = args.nth(0); - if args.len() > 0 { - die_user_error( - current_prog_name, - format!("Expected no arguments, got {:?}", args.collect::<Vec<_>>()), - ) - } -} - -pub fn args(current_prog_name: &str, no_of_positional_args: usize) -> Vec<Vec<u8>> { - let mut args = std::env::args_os(); - // remove argv[0] - let _ = args.nth(0); - if args.len() != no_of_positional_args { - die_user_error( - current_prog_name, - format!( - "Expected {} arguments, got {}, namely {:?}", - no_of_positional_args, - args.len(), - args.collect::<Vec<_>>() - ), - ) - } - args.map(|arg| arg.into_vec()).collect() -} - -pub fn args_for_exec( - current_prog_name: &str, - no_of_positional_args: usize, -) -> (Vec<Vec<u8>>, Vec<Vec<u8>>) { - let mut args = std::env::args_os(); - // remove argv[0] - let _ = args.nth(0); - let mut args = args.map(|arg| arg.into_vec()); - let mut pos_args = vec![]; - // get positional args - for i in 1..no_of_positional_args + 1 { - pos_args.push(args.nth(0).expect(&format!( - "{}: expects {} positional args, only got {}", - current_prog_name, no_of_positional_args, i - ))); - } - // prog... is the rest of the iterator - let prog: Vec<Vec<u8>> = args.collect(); - (pos_args, prog) -} - -pub fn exec_into_args<'a, 'b, Args, Arg, Env, Key, Val>( - current_prog_name: &str, - args: Args, - env_additions: Env, -) -> ! -where - Args: IntoIterator<Item = Arg>, - Arg: AsRef<[u8]>, - Env: IntoIterator<Item = (Key, Val)>, - Key: AsRef<[u8]>, - Val: AsRef<[u8]>, -{ - // TODO: is this possible without collecting into a Vec first, just leaving it an IntoIterator? - let args = args.into_iter().collect::<Vec<Arg>>(); - let mut args = args.iter().map(|v| OsStr::from_bytes(v.as_ref())); - let prog = args.nth(0).expect(&format!( - "{}: first argument must be an executable", - current_prog_name - )); - // TODO: same here - let env = env_additions.into_iter().collect::<Vec<(Key, Val)>>(); - let env = env - .iter() - .map(|(k, v)| (OsStr::from_bytes(k.as_ref()), OsStr::from_bytes(v.as_ref()))); - let err = std::process::Command::new(prog).args(args).envs(env).exec(); - die_missing_executable( - current_prog_name, - format!( - "exec failed: {}, while trying to execing into {:?}", - err, prog - ), - ); -} - -/// Exit 1 to signify a generic expected error -/// (e.g. something that sometimes just goes wrong, like a nix build). -pub fn die_expected_error<S>(current_prog_name: &str, msg: S) -> ! -where - S: AsRef<str>, -{ - die_with(1, current_prog_name, msg) -} - -/// Exit 100 to signify a user error (“the user is holding it wrong”). -/// This is a permanent error, if the program is executed the same way -/// it should crash with 100 again. -pub fn die_user_error<S>(current_prog_name: &str, msg: S) -> ! -where - S: AsRef<str>, -{ - die_with(100, current_prog_name, msg) -} - -/// Exit 101 to signify an unexpected crash (failing assertion or panic). -/// This is the same exit code that `panic!()` emits. -pub fn die_panic<S>(current_prog_name: &str, msg: S) -> ! -where - S: AsRef<str>, -{ - die_with(101, current_prog_name, msg) -} - -/// Exit 111 to signify a temporary error (such as resource exhaustion) -pub fn die_temporary<S>(current_prog_name: &str, msg: S) -> ! -where - S: AsRef<str>, -{ - die_with(111, current_prog_name, msg) -} - -/// Exit 126 to signify an environment problem -/// (the user has set up stuff incorrectly so the program cannot work) -pub fn die_environment_problem<S>(current_prog_name: &str, msg: S) -> ! -where - S: AsRef<str>, -{ - die_with(126, current_prog_name, msg) -} - -/// Exit 127 to signify a missing executable. -pub fn die_missing_executable<S>(current_prog_name: &str, msg: S) -> ! -where - S: AsRef<str>, -{ - die_with(127, current_prog_name, msg) -} - -fn die_with<S>(status: i32, current_prog_name: &str, msg: S) -> ! -where - S: AsRef<str>, -{ - eprintln!("{}: {}", current_prog_name, msg.as_ref()); - std::process::exit(status) -} |