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use std::error::Error as StdError;
use std::io::{Error as IoError, ErrorKind};
use crate::runtime_flags::RuntimeFlags;
use std::path::{Path, PathBuf};
#[derive(Debug, Clone)]
pub struct UnitdCmd {
pub(crate) process_executable_path: Option<Box<Path>>,
pub version: Option<String>,
pub flags: Option<RuntimeFlags>,
}
impl UnitdCmd {
pub(crate) fn new<S>(full_cmd: S, binary_name: &str) -> Result<UnitdCmd, Box<dyn StdError>>
where
S: Into<String>,
{
let process_cmd: String = full_cmd.into();
let parsable = process_cmd
.strip_prefix("unit: main v")
.and_then(|s| s.strip_suffix(']'));
if parsable.is_none() {
let msg = format!("cmd does not have the expected format: {}", process_cmd);
return Err(IoError::new(ErrorKind::InvalidInput, msg).into());
}
let parts = parsable
.expect("Unable to parse cmd")
.splitn(2, " [")
.collect::<Vec<&str>>();
if parts.len() != 2 {
let msg = format!("cmd does not have the expected format: {}", process_cmd);
return Err(IoError::new(ErrorKind::InvalidInput, msg).into());
}
let version = Some(parts[0].to_string());
let executable_path = UnitdCmd::parse_executable_path_from_cmd(parts[1], binary_name);
let flags = UnitdCmd::parse_runtime_flags_from_cmd(parts[1]);
Ok(UnitdCmd {
process_executable_path: executable_path,
version,
flags,
})
}
fn parse_executable_path_from_cmd<S>(full_cmd: S, binary_name: &str) -> Option<Box<Path>>
where
S: Into<String>,
{
let cmd = full_cmd.into();
if cmd.is_empty() {
return None;
}
let split = cmd.splitn(2, binary_name).collect::<Vec<&str>>();
if split.is_empty() {
return None;
}
let path = format!("{}{}", split[0], binary_name);
Some(PathBuf::from(path).into_boxed_path())
}
fn parse_runtime_flags_from_cmd<S>(full_cmd: S) -> Option<RuntimeFlags>
where
S: Into<String>,
{
let cmd = full_cmd.into();
if cmd.is_empty() {
return None;
}
// Split out everything in between the brackets [ and ]
let split = cmd.trim_end_matches(']').splitn(2, '[').collect::<Vec<&str>>();
if split.is_empty() {
return None;
}
/* Now we need to parse a string like this:
* ./sbin/unitd --no-daemon --tmp /tmp
* and only return what is after the invoking command */
split[0]
.find("--")
.map(|index| cmd[index..].to_string())
.map(RuntimeFlags::new)
}
}
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