rhg: Ignore trailing newlines in .hg/sharedpath

Differential Revision: https://phab.mercurial-scm.org/D10132

rust/hg-core/src/repo.rs

@@ -1,8 +1,8 b''
 use crate::config::{Config, ConfigError, ConfigParseError};
 use crate::errors::{HgError, IoErrorContext, IoResultExt};
 use crate::requirements;
-use crate::utils::current_dir;
 use crate::utils::files::get_path_from_bytes;
+use crate::utils::{current_dir, SliceExt};
 use memmap::{Mmap, MmapOptions};
 use std::collections::HashSet;
 use std::path::{Path, PathBuf};
@@ -118,7 +118,8 b' impl Repo {'
             store_path = dot_hg.join("store");
         } else {
             let bytes = hg_vfs.read("sharedpath")?;
-            let mut shared_path = get_path_from_bytes(&bytes).to_owned();
+            let mut shared_path =
+                get_path_from_bytes(bytes.trim_end_newlines()).to_owned();
             if relative {
                 shared_path = dot_hg.join(shared_path)
             }

rust/hg-core/src/utils.rs

@@ -67,6 +67,7 b' where'
 }
 
 pub trait SliceExt {
+    fn trim_end_newlines(&self) -> &Self;
     fn trim_end(&self) -> &Self;
     fn trim_start(&self) -> &Self;
     fn trim(&self) -> &Self;
@@ -80,6 +81,13 b' fn is_not_whitespace(c: &u8) -> bool {'
 }
 
 impl SliceExt for [u8] {
+    fn trim_end_newlines(&self) -> &[u8] {
+        if let Some(last) = self.iter().rposition(|&byte| byte != b'\n') {
+            &self[..=last]
+        } else {
+            &[]
+        }
+    }
     fn trim_end(&self) -> &[u8] {
         if let Some(last) = self.iter().rposition(is_not_whitespace) {
             &self[..=last]