diff --git a/Cargo.lock b/Cargo.lock
index 89ac8c5bb..39c72e03a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4,9 +4,9 @@ version = 3
 
 [[package]]
 name = "aho-corasick"
-version = "0.7.13"
+version = "0.7.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "043164d8ba5c4c3035fec9bbee8647c0261d788f3474306f93bb65901cae0e86"
+checksum = "1e37cfd5e7657ada45f742d6e99ca5788580b5c529dc78faf11ece6dc702656f"
 dependencies = [
  "memchr",
 ]
@@ -588,6 +588,7 @@ dependencies = [
  "protobuf",
  "protobuf-codegen-pure",
  "rand 0.8.0",
+ "regex",
  "serde_json",
  "tempfile",
  "test-case",
@@ -707,9 +708,9 @@ checksum = "60302e4db3a61da70c0cb7991976248362f30319e88850c487b9b95bbf059e00"
 
 [[package]]
 name = "memchr"
-version = "2.3.3"
+version = "2.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3728d817d99e5ac407411fa471ff9800a778d88a24685968b36824eaf4bee400"
+checksum = "b16bd47d9e329435e309c58469fe0791c2d0d1ba96ec0954152a5ae2b04387dc"
 
 [[package]]
 name = "memoffset"
@@ -1050,14 +1051,13 @@ dependencies = [
 
 [[package]]
 name = "regex"
-version = "1.4.2"
+version = "1.5.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "38cf2c13ed4745de91a5eb834e11c00bcc3709e773173b2ce4c56c9fbde04b9c"
+checksum = "d07a8629359eb56f1e2fb1652bb04212c072a87ba68546a04065d525673ac461"
 dependencies = [
  "aho-corasick",
  "memchr",
  "regex-syntax",
- "thread_local",
 ]
 
 [[package]]
@@ -1071,9 +1071,9 @@ dependencies = [
 
 [[package]]
 name = "regex-syntax"
-version = "0.6.21"
+version = "0.6.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3b181ba2dcf07aaccad5448e8ead58db5b742cf85dfe035e2227f137a539a189"
+checksum = "f497285884f3fcff424ffc933e56d7cbca511def0c9831a7f9b5f6153e3cc89b"
 
 [[package]]
 name = "remove_dir_all"
@@ -1309,15 +1309,6 @@ dependencies = [
  "syn",
 ]
 
-[[package]]
-name = "thread_local"
-version = "1.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d40c6d1b69745a6ec6fb1ca717914848da4b44ae29d9b3080cbee91d72a69b14"
-dependencies = [
- "lazy_static",
-]
-
 [[package]]
 name = "time"
 version = "0.1.44"
diff --git a/lib/Cargo.toml b/lib/Cargo.toml
index edb501f08..bf6bb7b1c 100644
--- a/lib/Cargo.toml
+++ b/lib/Cargo.toml
@@ -30,6 +30,7 @@ pest = "2.1.3"
 pest_derive = "2.1.0"
 protobuf = { version = "2.22.1", features = ["with-bytes"] }
 rand = "0.8.0"
+regex = "1.5.4"
 serde_json = "1.0.60"
 tempfile = "3.1.0"
 thiserror = "1.0.22"
diff --git a/lib/src/gitignore.rs b/lib/src/gitignore.rs
new file mode 100644
index 000000000..68ec918d5
--- /dev/null
+++ b/lib/src/gitignore.rs
@@ -0,0 +1,413 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use std::sync::Arc;
+
+use regex::{escape as regex_escape, Regex};
+
+pub enum GitIgnoreParseError {}
+
+struct GitIgnoreLine {
+    is_negative: bool,
+    regex: Regex,
+}
+
+impl GitIgnoreLine {
+    // Remove trailing spaces (unless backslash-escaped)
+    fn remove_trailing_space(input: &str) -> &str {
+        let mut trimmed_len = 0;
+        let mut non_space_seen = false;
+        let mut prev_was_space = false;
+        let mut in_escape = false;
+        for (i, c) in input.char_indices() {
+            if !prev_was_space && non_space_seen {
+                trimmed_len = i;
+            }
+            if c == ' ' {
+                if in_escape {
+                    in_escape = false;
+                } else {
+                    prev_was_space = true;
+                }
+            } else {
+                non_space_seen = true;
+                prev_was_space = false;
+                in_escape = c == '\\'
+            }
+        }
+        if !prev_was_space && non_space_seen {
+            trimmed_len = input.len();
+        }
+        &input.split_at(trimmed_len).0
+    }
+
+    fn parse(prefix: &str, input: &str) -> Result<Option<GitIgnoreLine>, GitIgnoreParseError> {
+        if input.starts_with('#') {
+            return Ok(None);
+        }
+
+        let input = GitIgnoreLine::remove_trailing_space(input);
+        // Remove leading "!" before checking for empty to match git's implementation
+        // (i.e. just "!" matching nothing, not everything).
+        let (is_negative, input) = match input.strip_prefix('!') {
+            None => (false, input),
+            Some(rest) => (true, rest),
+        };
+        if input.is_empty() {
+            return Ok(None);
+        }
+
+        let (matches_only_directory, input) = match input.strip_suffix('/') {
+            None => (false, input),
+            Some(rest) => (true, rest),
+        };
+        let (mut is_rooted, input) = match input.strip_prefix('/') {
+            None => (false, input),
+            Some(rest) => (true, rest),
+        };
+        is_rooted |= input.contains('/');
+
+        let mut regex = String::new();
+        if is_rooted {
+            regex.insert_str(0, prefix);
+            regex.insert(0, '^');
+        } else {
+            regex.insert_str(0, "(^|/)");
+        }
+
+        let components: Vec<_> = input.split('/').collect();
+        for (i, component) in components.iter().enumerate() {
+            if *component == "**" {
+                if i == components.len() - 1 {
+                    regex.push_str(".*");
+                } else {
+                    regex.push_str("(.*/)?");
+                }
+            } else {
+                let mut in_escape = false;
+                let mut character_class: Option<String> = None;
+                for c in component.chars() {
+                    if in_escape {
+                        in_escape = false;
+                        if !matches!(c, ' ' | '#' | '!' | '?' | '\\' | '*') {
+                            regex.push_str(&regex_escape("\\"));
+                        }
+                        regex.push_str(&regex_escape(&c.to_string()));
+                    } else if c == '\\' {
+                        in_escape = true;
+                    } else if let Some(characters) = &mut character_class {
+                        if c == ']' {
+                            regex.push('[');
+                            regex.push_str(&characters);
+                            regex.push(']');
+                            character_class = None;
+                        } else {
+                            characters.push(c);
+                        }
+                    } else {
+                        in_escape = false;
+                        if c == '?' {
+                            regex.push_str("[^/]");
+                        } else if c == '*' {
+                            regex.push_str("[^/]*");
+                        } else if c == '[' {
+                            character_class = Some(String::new());
+                        } else {
+                            regex.push_str(&regex_escape(&c.to_string()));
+                        }
+                    }
+                }
+                if in_escape {
+                    regex.push_str(&regex_escape("\\"));
+                }
+                if i < components.len() - 1 {
+                    regex.push('/');
+                }
+            }
+        }
+        if matches_only_directory {
+            regex.push_str("/.*");
+        } else {
+            regex.push_str("(/.*|$)");
+        }
+        let regex = Regex::new(&regex).unwrap();
+
+        Ok(Some(GitIgnoreLine { is_negative, regex }))
+    }
+
+    fn matches_file(&self, path: &str) -> bool {
+        self.regex.is_match(path)
+    }
+}
+
+pub struct GitIgnoreFile {
+    parent: Option<Arc<GitIgnoreFile>>,
+    lines: Vec<GitIgnoreLine>,
+}
+
+impl GitIgnoreFile {
+    pub fn empty() -> Arc<GitIgnoreFile> {
+        Arc::new(GitIgnoreFile {
+            parent: None,
+            lines: vec![],
+        })
+    }
+
+    pub fn chain(
+        self: &Arc<GitIgnoreFile>,
+        prefix: &str,
+        input: &[u8],
+    ) -> Result<Arc<GitIgnoreFile>, GitIgnoreParseError> {
+        let mut lines = vec![];
+        for input_line in input.split(|b| *b == b'\n') {
+            // Skip non-utf8 lines
+            if let Ok(line_string) = String::from_utf8(input_line.to_vec()) {
+                if let Some(line) = GitIgnoreLine::parse(prefix, &line_string)? {
+                    lines.push(line);
+                }
+            }
+        }
+
+        Ok(Arc::new(GitIgnoreFile {
+            parent: Some(self.clone()),
+            lines,
+        }))
+    }
+
+    fn all_lines_reversed<'a>(&'a self) -> Box<dyn Iterator<Item = &GitIgnoreLine> + 'a> {
+        if let Some(parent) = &self.parent {
+            Box::new(self.lines.iter().rev().chain(parent.all_lines_reversed()))
+        } else {
+            Box::new(self.lines.iter().rev())
+        }
+    }
+
+    pub fn matches_file(&self, path: &str) -> bool {
+        // Later lines take precedence, so check them in reverse
+        for line in self.all_lines_reversed() {
+            if line.matches_file(path) {
+                return !line.is_negative;
+            }
+        }
+        false
+    }
+}
+
+#[cfg(test)]
+mod tests {
+
+    use super::*;
+
+    fn matches_file(input: &[u8], path: &str) -> bool {
+        let file = GitIgnoreFile::empty().chain("", input).ok().unwrap();
+        file.matches_file(path)
+    }
+
+    #[test]
+    fn test_gitignore_empty_file() {
+        let file = GitIgnoreFile::empty();
+        assert!(!file.matches_file("foo"));
+    }
+
+    #[test]
+    fn test_gitignore_empty_file_with_prefix() {
+        let file = GitIgnoreFile::empty().chain("dir/", b"").ok().unwrap();
+        assert!(!file.matches_file("dir/foo"));
+    }
+
+    #[test]
+    fn test_gitignore_literal() {
+        let file = GitIgnoreFile::empty().chain("", b"foo\n").ok().unwrap();
+        assert!(file.matches_file("foo"));
+        assert!(file.matches_file("dir/foo"));
+        assert!(file.matches_file("dir/subdir/foo"));
+        assert!(!file.matches_file("food"));
+        assert!(!file.matches_file("dir/food"));
+    }
+
+    #[test]
+    fn test_gitignore_literal_with_prefix() {
+        let file = GitIgnoreFile::empty().chain("dir/", b"foo\n").ok().unwrap();
+        // I consider it undefined whether a file in a parent directory matches, but
+        // let's test it anyway
+        assert!(file.matches_file("foo"));
+        assert!(file.matches_file("dir/foo"));
+        assert!(file.matches_file("dir/subdir/foo"));
+    }
+
+    #[test]
+    fn test_gitignore_rooted_literal() {
+        let file = GitIgnoreFile::empty().chain("", b"/foo\n").ok().unwrap();
+        assert!(file.matches_file("foo"));
+        assert!(!file.matches_file("dir/foo"));
+    }
+
+    #[test]
+    fn test_gitignore_rooted_literal_with_prefix() {
+        let file = GitIgnoreFile::empty()
+            .chain("dir/", b"/foo\n")
+            .ok()
+            .unwrap();
+        // I consider it undefined whether a file in a parent directory matches, but
+        // let's test it anyway
+        assert!(!file.matches_file("foo"));
+        assert!(file.matches_file("dir/foo"));
+        assert!(!file.matches_file("dir/subdir/foo"));
+    }
+
+    #[test]
+    fn test_gitignore_deep_dir() {
+        let file = GitIgnoreFile::empty()
+            .chain("", b"/dir1/dir2/dir3\n")
+            .ok()
+            .unwrap();
+        assert!(!file.matches_file("foo"));
+        assert!(!file.matches_file("dir1/foo"));
+        assert!(!file.matches_file("dir1/dir2/foo"));
+        assert!(file.matches_file("dir1/dir2/dir3/foo"));
+        assert!(file.matches_file("dir1/dir2/dir3/dir4/foo"));
+    }
+
+    #[test]
+    fn test_gitignore_match_only_dir() {
+        let file = GitIgnoreFile::empty().chain("", b"/dir/\n").ok().unwrap();
+        assert!(!file.matches_file("dir"));
+        assert!(file.matches_file("dir/foo"));
+        assert!(file.matches_file("dir/subdir/foo"));
+    }
+
+    #[test]
+    fn test_gitignore_unusual_symbols() {
+        assert!(matches_file(b"\\*\n", "*"));
+        assert!(!matches_file(b"\\*\n", "foo"));
+        assert!(matches_file(b"\\\n", "\\"));
+        assert!(matches_file(b"\\!\n", "!"));
+        assert!(matches_file(b"\\?\n", "?"));
+        assert!(!matches_file(b"\\?\n", "x"));
+        // Invalid escapes are treated like literal backslashes
+        assert!(matches_file(b"\\w\n", "\\w"));
+        assert!(!matches_file(b"\\w\n", "w"));
+    }
+
+    #[test]
+    fn test_gitignore_whitespace() {
+        assert!(!matches_file(b" \n", " "));
+        assert!(matches_file(b"\\ \n", " "));
+        assert!(matches_file(b" a\n", " a"));
+        assert!(matches_file(b"a b\n", "a b"));
+        assert!(matches_file(b"a b \n", "a b"));
+        assert!(!matches_file(b"a b \n", "a b "));
+        assert!(matches_file(b"a b\\ \\ \n", "a b  "));
+        // It's unclear how this should be interpreted, but we count spaces before
+        // escaped spaces
+        assert!(matches_file(b"a b \\  \n", "a b  "));
+    }
+
+    #[test]
+    fn test_gitignore_glob() {
+        assert!(!matches_file(b"*.o\n", "foo"));
+        assert!(matches_file(b"*.o\n", "foo.o"));
+        assert!(!matches_file(b"foo.?\n", "foo"));
+        assert!(!matches_file(b"foo.?\n", "foo."));
+        assert!(matches_file(b"foo.?\n", "foo.o"));
+    }
+
+    #[test]
+    fn test_gitignore_range() {
+        assert!(!matches_file(b"foo.[az]\n", "foo"));
+        assert!(matches_file(b"foo.[az]\n", "foo.a"));
+        assert!(!matches_file(b"foo.[az]\n", "foo.g"));
+        assert!(matches_file(b"foo.[az]\n", "foo.z"));
+        assert!(!matches_file(b"foo.[a-z]\n", "foo"));
+        assert!(matches_file(b"foo.[a-z]\n", "foo.a"));
+        assert!(matches_file(b"foo.[a-z]\n", "foo.g"));
+        assert!(matches_file(b"foo.[a-z]\n", "foo.z"));
+        assert!(matches_file(b"foo.[0-9a-fA-F]\n", "foo.5"));
+        assert!(matches_file(b"foo.[0-9a-fA-F]\n", "foo.c"));
+        assert!(matches_file(b"foo.[0-9a-fA-F]\n", "foo.E"));
+        assert!(!matches_file(b"foo.[0-9a-fA-F]\n", "foo._"));
+    }
+
+    #[test]
+    fn test_gitignore_leading_dir_glob() {
+        assert!(matches_file(b"**/foo\n", "foo"));
+        assert!(matches_file(b"**/foo\n", "dir1/dir2/foo"));
+        assert!(matches_file(b"**/foo\n", "foo/file"));
+        assert!(matches_file(b"**/dir/foo\n", "dir/foo"));
+        assert!(matches_file(b"**/dir/foo\n", "dir1/dir2/dir/foo"));
+    }
+
+    #[test]
+    fn test_gitignore_leading_dir_glob_with_prefix() {
+        let file = GitIgnoreFile::empty()
+            .chain("dir1/dir2/", b"**/foo\n")
+            .ok()
+            .unwrap();
+        // I consider it undefined whether a file in a parent directory matches, but
+        // let's test it anyway
+        assert!(!file.matches_file("foo"));
+        assert!(file.matches_file("dir1/dir2/foo"));
+        assert!(!file.matches_file("dir1/dir2/bar"));
+        assert!(file.matches_file("dir1/dir2/sub1/sub2/foo"));
+        assert!(!file.matches_file("dir1/dir2/sub1/sub2/bar"));
+    }
+
+    #[test]
+    fn test_gitignore_trailing_dir_glob() {
+        assert!(!matches_file(b"abc/**\n", "abc"));
+        assert!(matches_file(b"abc/**\n", "abc/file"));
+        assert!(matches_file(b"abc/**\n", "abc/dir/file"));
+    }
+
+    #[test]
+    fn test_gitignore_internal_dir_glob() {
+        assert!(matches_file(b"a/**/b\n", "a/b"));
+        assert!(matches_file(b"a/**/b\n", "a/x/b"));
+        assert!(matches_file(b"a/**/b\n", "a/x/y/b"));
+        assert!(!matches_file(b"a/**/b\n", "ax/y/b"));
+        assert!(!matches_file(b"a/**/b\n", "a/x/yb"));
+        assert!(!matches_file(b"a/**/b\n", "ab"));
+    }
+
+    #[test]
+    fn test_gitignore_internal_dir_glob_not_really() {
+        assert!(!matches_file(b"a/x**y/b\n", "a/b"));
+        assert!(matches_file(b"a/x**y/b\n", "a/xy/b"));
+        assert!(matches_file(b"a/x**y/b\n", "a/xzzzy/b"));
+    }
+
+    #[test]
+    fn test_gitignore_line_ordering() {
+        assert!(matches_file(b"foo\n!foo/bar\n", "foo"));
+        assert!(!matches_file(b"foo\n!foo/bar\n", "foo/bar"));
+        assert!(matches_file(b"foo\n!foo/bar\n", "foo/baz"));
+        assert!(matches_file(b"foo\n!foo/bar\nfoo/bar/baz", "foo"));
+        assert!(!matches_file(b"foo\n!foo/bar\nfoo/bar/baz", "foo/bar"));
+        assert!(matches_file(b"foo\n!foo/bar\nfoo/bar/baz", "foo/bar/baz"));
+        assert!(!matches_file(b"foo\n!foo/bar\nfoo/bar/baz", "foo/bar/quux"));
+    }
+
+    #[test]
+    fn test_gitignore_file_ordering() {
+        let file1 = GitIgnoreFile::empty().chain("", b"foo\n").ok().unwrap();
+        let file2 = file1.chain("foo/", b"!bar").ok().unwrap();
+        let file3 = file2.chain("foo/bar/", b"baz").ok().unwrap();
+        assert!(file1.matches_file("foo"));
+        assert!(file1.matches_file("foo/bar"));
+        assert!(!file2.matches_file("foo/bar"));
+        assert!(file2.matches_file("foo/baz"));
+        assert!(file3.matches_file("foo/bar/baz"));
+        assert!(!file3.matches_file("foo/bar/qux"));
+    }
+}
diff --git a/lib/src/lib.rs b/lib/src/lib.rs
index 40ae2682f..2d1454b94 100644
--- a/lib/src/lib.rs
+++ b/lib/src/lib.rs
@@ -33,6 +33,7 @@ pub mod evolution;
 pub mod files;
 pub mod git;
 pub mod git_store;
+pub mod gitignore;
 pub mod index;
 pub mod index_store;
 pub mod local_store;
diff --git a/lib/src/working_copy.rs b/lib/src/working_copy.rs
index 1a22cabb0..2504ae20d 100644
--- a/lib/src/working_copy.rs
+++ b/lib/src/working_copy.rs
@@ -17,6 +17,7 @@ use std::collections::{BTreeMap, HashSet};
 use std::convert::TryInto;
 use std::fs;
 use std::fs::{File, OpenOptions};
+use std::io::Read;
 #[cfg(unix)]
 use std::os::unix::fs::symlink;
 #[cfg(unix)]
@@ -27,13 +28,13 @@ use std::path::{Path, PathBuf};
 use std::sync::Arc;
 use std::time::UNIX_EPOCH;
 
-use git2::{Repository, RepositoryInitOptions};
 use protobuf::Message;
 use tempfile::NamedTempFile;
 use thiserror::Error;
 
 use crate::commit::Commit;
 use crate::commit_builder::CommitBuilder;
+use crate::gitignore::GitIgnoreFile;
 use crate::lock::FileLock;
 use crate::repo::ReadonlyRepo;
 use crate::repo_path::{
@@ -282,6 +283,25 @@ impl TreeState {
         self.store.write_symlink(path, str_target).unwrap()
     }
 
+    fn try_chain_gitignore(
+        base: &Arc<GitIgnoreFile>,
+        prefix: &str,
+        file: PathBuf,
+    ) -> Arc<GitIgnoreFile> {
+        if file.is_file() {
+            let mut file = File::open(file).unwrap();
+            let mut buf = Vec::new();
+            file.read_to_end(&mut buf).unwrap();
+            if let Ok(chained) = base.chain(prefix, &buf) {
+                chained
+            } else {
+                base.clone()
+            }
+        } else {
+            base.clone()
+        }
+    }
+
     // Look for changes to the working copy. If there are any changes, create
     // a new tree from it and return it, and also update the dirstate on disk.
     // TODO: respect ignores
@@ -289,33 +309,30 @@ impl TreeState {
         // We create a temporary git repo with the working copy shared with ours only
         // so we can use libgit2's .gitignore check.
         // TODO: We should probably have the caller pass in the home directory to the
-        // library crate instead of depending on $HOME directly here (as we do because
-        // git2::Repository::status_should_ignore() reads the .gitignore there).
-        // TODO: Do this more cleanly, perhaps by reading .gitignore files ourselves.
-        let git_repo_dir = tempfile::tempdir().unwrap();
-        let mut git_repo_options = RepositoryInitOptions::new();
-        git_repo_options.workdir_path(&self.working_copy_path);
-        // Repository::init_opts creates a ".git" file in the working copy,
-        // which is undesired. On Windows it's worse because that ".git" makes
-        // the next Repository::init_opts fail with "Permission Denied".
-        // Automatically remove it.
-        let _cleanup_dot_git = {
-            struct Cleanup(PathBuf);
-            impl Drop for Cleanup {
-                fn drop(&mut self) {
-                    let _ = fs::remove_file(&self.0);
-                }
-            }
-            Cleanup(self.working_copy_path.join(".git"))
-        };
-        let git_repo = Repository::init_opts(git_repo_dir.path(), &git_repo_options).unwrap();
+        // library crate instead of depending on $HOME directly here. We should also
+        // have the caller (within the library crate) chain that the
+        // .jj/git/info/exclude file if we're inside a git-backed repo.
+        let home_dir = std::env::var("HOME");
+        let home_dir_path = PathBuf::from(home_dir.unwrap());
+        let mut git_ignore = GitIgnoreFile::empty();
+        git_ignore =
+            TreeState::try_chain_gitignore(&git_ignore, "", home_dir_path.join(".gitignore"));
 
-        let mut work = vec![(DirRepoPath::root(), self.working_copy_path.clone())];
+        let mut work = vec![(
+            DirRepoPath::root(),
+            self.working_copy_path.clone(),
+            git_ignore,
+        )];
         let mut tree_builder = self.store.tree_builder(self.tree_id.clone());
         let mut deleted_files: HashSet<&FileRepoPath> = self.file_states.keys().collect();
         let mut modified_files = BTreeMap::new();
         while !work.is_empty() {
-            let (dir, disk_dir) = work.pop().unwrap();
+            let (dir, disk_dir, git_ignore) = work.pop().unwrap();
+            let git_ignore = TreeState::try_chain_gitignore(
+                &git_ignore,
+                &dir.to_internal_string(),
+                disk_dir.join(".gitignore"),
+            );
             for maybe_entry in disk_dir.read_dir().unwrap() {
                 let entry = maybe_entry.unwrap();
                 let file_type = entry.file_type().unwrap();
@@ -327,7 +344,7 @@ impl TreeState {
                 if file_type.is_dir() {
                     let subdir = dir.join(&DirRepoPathComponent::from(name));
                     let disk_subdir = disk_dir.join(file_name);
-                    work.push((subdir, disk_subdir));
+                    work.push((subdir, disk_subdir, git_ignore.clone()));
                 } else {
                     let file = dir.join(&FileRepoPathComponent::from(name));
                     let disk_file = disk_dir.join(file_name);
@@ -338,7 +355,7 @@ impl TreeState {
                     match self.file_states.get(&file) {
                         None => {
                             // untracked
-                            if git_repo.status_should_ignore(&disk_file).unwrap() {
+                            if git_ignore.matches_file(&file.to_internal_string()) {
                                 continue;
                             }
                             clean = false;