rust: fix testing with $TMPDIR ≠ /tmp

Differential Revision: https://phab.mercurial-scm.org/D9670

rust/hg-core/src/utils/path_auditor.rs

@@ -1,232 +1,233 b''
 // path_auditor.rs
 //
 // Copyright 2020
 // Raphaël Gomès <[e-mail]>,
 //
 // This software may be used and distributed according to the terms of the
 // GNU General Public License version 2 or any later version.
 
 use crate::utils::{
     files::lower_clean,
     find_slice_in_slice,
     hg_path::{hg_path_to_path_buf, HgPath, HgPathBuf, HgPathError},
 };
 use std::collections::HashSet;
 use std::path::{Path, PathBuf};
 use std::sync::{Mutex, RwLock};
 
 /// Ensures that a path is valid for use in the repository i.e. does not use
 /// any banned components, does not traverse a symlink, etc.
 #[derive(Debug, Default)]
 pub struct PathAuditor {
     audited: Mutex<HashSet<HgPathBuf>>,
     audited_dirs: RwLock<HashSet<HgPathBuf>>,
     root: PathBuf,
 }
 
 impl PathAuditor {
     pub fn new(root: impl AsRef<Path>) -> Self {
         Self {
             root: root.as_ref().to_owned(),
             ..Default::default()
         }
     }
     pub fn audit_path(
         &self,
         path: impl AsRef<HgPath>,
     ) -> Result<(), HgPathError> {
         // TODO windows "localpath" normalization
         let path = path.as_ref();
         if path.is_empty() {
             return Ok(());
         }
         // TODO case normalization
         if self.audited.lock().unwrap().contains(path) {
             return Ok(());
         }
         // AIX ignores "/" at end of path, others raise EISDIR.
         let last_byte = path.as_bytes()[path.len() - 1];
         if last_byte == b'/' || last_byte == b'\\' {
             return Err(HgPathError::EndsWithSlash(path.to_owned()));
         }
         let parts: Vec<_> = path
             .as_bytes()
             .split(|b| std::path::is_separator(*b as char))
             .collect();
 
         let first_component = lower_clean(parts[0]);
         let first_component = first_component.as_slice();
         if !path.split_drive().0.is_empty()
             || (first_component == b".hg"
                 || first_component == b".hg."
                 || first_component == b"")
             || parts.iter().any(|c| c == b"..")
         {
             return Err(HgPathError::InsideDotHg(path.to_owned()));
         }
 
         // Windows shortname aliases
         for part in parts.iter() {
             if part.contains(&b'~') {
                 let mut split = part.splitn(2, |b| *b == b'~');
                 let first =
                     split.next().unwrap().to_owned().to_ascii_uppercase();
                 let last = split.next().unwrap();
                 if last.iter().all(u8::is_ascii_digit)
                     && (first == b"HG" || first == b"HG8B6C")
                 {
                     return Err(HgPathError::ContainsIllegalComponent(
                         path.to_owned(),
                     ));
                 }
             }
         }
         let lower_path = lower_clean(path.as_bytes());
         if find_slice_in_slice(&lower_path, b".hg").is_some() {
             let lower_parts: Vec<_> = path
                 .as_bytes()
                 .split(|b| std::path::is_separator(*b as char))
                 .collect();
             for pattern in [b".hg".to_vec(), b".hg.".to_vec()].iter() {
                 if let Some(pos) = lower_parts[1..]
                     .iter()
                     .position(|part| part == &pattern.as_slice())
                 {
                     let base = lower_parts[..=pos]
                         .iter()
                         .fold(HgPathBuf::new(), |acc, p| {
                             acc.join(HgPath::new(p))
                         });
                     return Err(HgPathError::IsInsideNestedRepo {
                         path: path.to_owned(),
                         nested_repo: base,
                     });
                 }
             }
         }
 
         let parts = &parts[..parts.len().saturating_sub(1)];
 
         // We don't want to add "foo/bar/baz" to `audited_dirs` before checking
         // if there's a "foo/.hg" directory. This also means we won't
         // accidentally traverse a symlink into some other filesystem (which
         // is potentially expensive to access).
         for index in 0..parts.len() {
             let prefix = &parts[..=index].join(&b'/');
             let prefix = HgPath::new(prefix);
             if self.audited_dirs.read().unwrap().contains(prefix) {
                 continue;
             }
             self.check_filesystem(&prefix, &path)?;
             self.audited_dirs.write().unwrap().insert(prefix.to_owned());
         }
 
         self.audited.lock().unwrap().insert(path.to_owned());
 
         Ok(())
     }
 
     pub fn check_filesystem(
         &self,
         prefix: impl AsRef<HgPath>,
         path: impl AsRef<HgPath>,
     ) -> Result<(), HgPathError> {
         let prefix = prefix.as_ref();
         let path = path.as_ref();
         let current_path = self.root.join(
             hg_path_to_path_buf(prefix)
                 .map_err(|_| HgPathError::NotFsCompliant(path.to_owned()))?,
         );
         match std::fs::symlink_metadata(&current_path) {
             Err(e) => {
                 // EINVAL can be raised as invalid path syntax under win32.
                 if e.kind() != std::io::ErrorKind::NotFound
                     && e.kind() != std::io::ErrorKind::InvalidInput
                     && e.raw_os_error() != Some(20)
                 {
                     // Rust does not yet have an `ErrorKind` for
                     // `NotADirectory` (errno 20)
                     // It happens if the dirstate contains `foo/bar` and
                     // foo is not a directory
                     return Err(HgPathError::NotFsCompliant(path.to_owned()));
                 }
             }
             Ok(meta) => {
                 if meta.file_type().is_symlink() {
                     return Err(HgPathError::TraversesSymbolicLink {
                         path: path.to_owned(),
                         symlink: prefix.to_owned(),
                     });
                 }
                 if meta.file_type().is_dir()
                     && current_path.join(".hg").is_dir()
                 {
                     return Err(HgPathError::IsInsideNestedRepo {
                         path: path.to_owned(),
                         nested_repo: prefix.to_owned(),
                     });
                 }
             }
         };
 
         Ok(())
     }
 
     pub fn check(&self, path: impl AsRef<HgPath>) -> bool {
         self.audit_path(path).is_ok()
     }
 }
 
 #[cfg(test)]
 mod tests {
     use super::*;
     use crate::utils::files::get_path_from_bytes;
     use crate::utils::hg_path::path_to_hg_path_buf;
 
     #[test]
     fn test_path_auditor() {
         let auditor = PathAuditor::new(get_path_from_bytes(b"/tmp"));
 
         let path = HgPath::new(b".hg/00changelog.i");
         assert_eq!(
             auditor.audit_path(path),
             Err(HgPathError::InsideDotHg(path.to_owned()))
         );
         let path = HgPath::new(b"this/is/nested/.hg/thing.txt");
         assert_eq!(
             auditor.audit_path(path),
             Err(HgPathError::IsInsideNestedRepo {
                 path: path.to_owned(),
                 nested_repo: HgPathBuf::from_bytes(b"this/is/nested")
             })
         );
 
         use std::fs::{create_dir, File};
         use tempfile::tempdir;
 
         let base_dir = tempdir().unwrap();
         let base_dir_path = base_dir.path();
+        let skip = base_dir_path.components().count() - 1;
         let a = base_dir_path.join("a");
         let b = base_dir_path.join("b");
         create_dir(&a).unwrap();
         let in_a_path = a.join("in_a");
         File::create(in_a_path).unwrap();
 
         // TODO make portable
         std::os::unix::fs::symlink(&a, &b).unwrap();
 
-        let buf = b.join("in_a").components().skip(2).collect::<PathBuf>();
+        let buf = b.join("in_a").components().skip(skip).collect::<PathBuf>();
         eprintln!("buf: {}", buf.display());
         let path = path_to_hg_path_buf(buf).unwrap();
         assert_eq!(
             auditor.audit_path(&path),
             Err(HgPathError::TraversesSymbolicLink {
                 path: path,
                 symlink: path_to_hg_path_buf(
                     b.components().skip(2).collect::<PathBuf>()
                 )
                 .unwrap()
             })
         );
     }
 }