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#![deny(missing_docs)]
use std::collections::HashMap;
use std::convert::From;
use std::fs::File;
use std::io::{BufReader, BufRead};
use std::path::Path;
use std::borrow::Cow;
const PATHS: [&'static str; 2] = ["/etc/os-release", "/usr/lib/os-release"];
const QUOTES: [&'static str; 2] = ["\"", "'"];
const COMMON_KEYS: [&'static str; 16] = ["ANSI_COLOR",
"BUG_REPORT_URL",
"BUILD_ID",
"CPE_NAME",
"HOME_URL",
"ID",
"ID_LIKE",
"NAME",
"PRETTY_NAME",
"PRIVACY_POLICY_URL",
"SUPPORT_URL",
"VARIANT",
"VARIANT_ID",
"VERSION",
"VERSION_CODENAME",
"VERSION_ID"];
#[derive(Debug, PartialEq)]
pub enum OsReleaseError {
Io,
NoFile,
ParseError,
}
impl From<std::io::Error> for OsReleaseError {
fn from(_: std::io::Error) -> OsReleaseError {
OsReleaseError::Io
}
}
pub type Result<T> = std::result::Result<T, OsReleaseError>;
fn trim_quotes(s: &str) -> &str {
if QUOTES.iter().any(|q| s.starts_with(q) && s.ends_with(q)) {
&s[1..s.len() - 1]
} else {
s
}
}
fn extract_variable_and_value(s: &str) -> Result<(Cow<'static, str>, String)> {
if let Some(equal) = s.chars().position(|c| c == '=') {
let var = &s[..equal];
let var = var.trim();
let val = &s[equal + 1..];
let val = trim_quotes(val.trim()).to_string();
if let Some(key) = COMMON_KEYS.iter().find(|&k| *k == var) {
Ok((Cow::Borrowed(key), val))
} else {
Ok((Cow::Owned(var.to_string()), val))
}
} else {
Err(OsReleaseError::ParseError)
}
}
pub fn parse_os_release<P: AsRef<Path>>(path: P) -> Result<HashMap<Cow<'static, str>, String>> {
let mut os_release = HashMap::new();
let file = try!(File::open(path));
let reader = BufReader::new(file);
for line in reader.lines() {
let line = try!(line);
let line = line.trim();
if line.starts_with('#') || line.is_empty() {
continue;
}
let var_val = try!(extract_variable_and_value(line));
os_release.insert(var_val.0, var_val.1);
}
Ok(os_release)
}
pub fn parse_os_release_str(data: &str) -> Result<HashMap<Cow<'static, str>, String>> {
let mut os_release = HashMap::new();
for line in data.split('\n') {
let line = line.trim();
if line.starts_with('#') || line.is_empty() {
continue;
}
let var_val = try!(extract_variable_and_value(line));
os_release.insert(var_val.0, var_val.1);
}
Ok(os_release)
}
pub fn get_os_release() -> Result<HashMap<Cow<'static, str>, String>> {
for file in &PATHS {
if let Ok(os_release) = parse_os_release(file) {
return Ok(os_release);
}
}
Err(OsReleaseError::NoFile)
}