Refactor config loading to use filesystem abstraction (#18209)

Initial pass propagating FileSystem through config loading.

codex-rs/git-utils/src/lib.rs

@@ -1,6 +1,3 @@
-use std::fmt;
-use std::path::PathBuf;
-
 mod apply;
 mod branch;
 mod errors;
@@ -16,6 +13,8 @@ pub use apply::extract_paths_from_patch;
 pub use apply::parse_git_apply_output;
 pub use apply::stage_paths;
 pub use branch::merge_base_with_head;
+pub use codex_protocol::models::GhostCommit;
+pub use codex_protocol::protocol::GitSha;
 pub use errors::GitToolingError;
 pub use ghost_commits::CreateGhostCommitOptions;
 pub use ghost_commits::GhostSnapshotConfig;
@@ -45,72 +44,3 @@ pub use info::local_git_branches;
 pub use info::recent_commits;
 pub use info::resolve_root_git_project_for_trust;
 pub use platform::create_symlink;
-use schemars::JsonSchema;
-use serde::Deserialize;
-use serde::Serialize;
-use ts_rs::TS;
-
-type CommitID = String;
-
-#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema, TS)]
-#[serde(transparent)]
-#[ts(type = "string")]
-pub struct GitSha(pub String);
-
-impl GitSha {
-    pub fn new(sha: &str) -> Self {
-        Self(sha.to_string())
-    }
-}
-
-/// Details of a ghost commit created from a repository state.
-#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, JsonSchema, TS)]
-pub struct GhostCommit {
-    id: CommitID,
-    parent: Option<CommitID>,
-    preexisting_untracked_files: Vec<PathBuf>,
-    preexisting_untracked_dirs: Vec<PathBuf>,
-}
-
-impl GhostCommit {
-    /// Create a new ghost commit wrapper from a raw commit ID and optional parent.
-    pub fn new(
-        id: CommitID,
-        parent: Option<CommitID>,
-        preexisting_untracked_files: Vec<PathBuf>,
-        preexisting_untracked_dirs: Vec<PathBuf>,
-    ) -> Self {
-        Self {
-            id,
-            parent,
-            preexisting_untracked_files,
-            preexisting_untracked_dirs,
-        }
-    }
-
-    /// Commit ID for the snapshot.
-    pub fn id(&self) -> &str {
-        &self.id
-    }
-
-    /// Parent commit ID, if the repository had a `HEAD` at creation time.
-    pub fn parent(&self) -> Option<&str> {
-        self.parent.as_deref()
-    }
-
-    /// Untracked or ignored files that already existed when the snapshot was captured.
-    pub fn preexisting_untracked_files(&self) -> &[PathBuf] {
-        &self.preexisting_untracked_files
-    }
-
-    /// Untracked or ignored directories that already existed when the snapshot was captured.
-    pub fn preexisting_untracked_dirs(&self) -> &[PathBuf] {
-        &self.preexisting_untracked_dirs
-    }
-}
-
-impl fmt::Display for GhostCommit {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "{}", self.id)
-    }
-}