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fs-mistrust: Introduce tempoary PwdGrpProvider alias 

This allows us to change a number of trait bounds in advance, reducing
noise in the next commit.
This commit is contained in:
Ian Jackson 2023-07-14 12:29:08 +01:00
parent a6108bb9b3
commit bf65b7763e
1 changed files with 8 additions and 4 deletions
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12
crates/fs-mistrust/src/user.rs
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@ -11,6 +11,10 @@ use std::{
sync::Mutex,
};
/// XXXX temporary alias
trait PwdGrpProvider: users::Users + users::Groups {}
impl<U: users::Users + users::Groups> PwdGrpProvider for U {}
/// Cached values of user db entries we've looked up.
///
/// Caching here saves time, AND makes our code testable.
@ -24,7 +28,7 @@ fn handle_pwd_error(e: io::Error) -> Error {
}
/// Like get_self_named_gid(), but use a provided user database.
fn get_self_named_gid_impl<U: users::Groups + users::Users>(userdb: &U) -> io::Result<Option<u32>> {
fn get_self_named_gid_impl<U: PwdGrpProvider>(userdb: &U) -> io::Result<Option<u32>> {
let Some(username) = get_own_username(userdb)? else { return Ok(None) };
let Some(group) = userdb.get_group_by_name(username.as_os_str())
@ -48,7 +52,7 @@ fn get_self_named_gid_impl<U: users::Groups + users::Users>(userdb: &U) -> io::R
///
/// Failing that, we look for a user entry for our current UID.
#[allow(clippy::unnecessary_wraps)] // XXXX
fn get_own_username<U: users::Users>(userdb: &U) -> io::Result<Option<OsString>> {
fn get_own_username<U: PwdGrpProvider>(userdb: &U) -> io::Result<Option<OsString>> {
let my_uid = userdb.get_current_uid();
if let Some(username) = std::env::var_os("USER") {
@ -171,7 +175,7 @@ impl TrustedUser {
self.get_uid_impl(&*userdb)
}
/// As `get_uid`, but take a userdb.
fn get_uid_impl<U: users::Users>(&self, userdb: &U) -> Result<Option<u32>, Error> {
fn get_uid_impl<U: PwdGrpProvider>(&self, userdb: &U) -> Result<Option<u32>, Error> {
match self {
TrustedUser::None => Ok(None),
TrustedUser::Current => Ok(Some(userdb.get_current_uid())),
@ -250,7 +254,7 @@ impl TrustedGroup {
self.get_gid_impl(&*userdb)
}
/// Like `get_gid`, but take a user db as an argument.
fn get_gid_impl<U: users::Users + users::Groups>(
fn get_gid_impl<U: PwdGrpProvider>(
&self,
userdb: &U,
) -> Result<Option<u32>, Error> {