feat: Allow index access to be toggled with the index feature.

gix/Cargo.toml

@@ -48,7 +48,7 @@ default = ["max-performance-safe", "comfort", "basic", "extras"]
 #! Bundles are for convenience only and bear no further meaning beyond the cargo manifest file.
 
 ## More fundamental components that most will be able to make good use of.
-basic = ["blob-diff", "revision"]
+basic = ["blob-diff", "revision", "index"]
 
 ## Various additional features and capabilities that are not necessarily part of what most users would need.
 extras = ["worktree-stream", "worktree-archive", "revparse-regex", "mailmap", "excludes", "attributes", "worktree-mutation", "credentials"]
@@ -61,6 +61,9 @@ comfort = ["gix-features/progress-unit-bytes", "gix-features/progress-unit-human
 #! A component is a distinct feature which may be comprised of one or more methods around a particular topic.
 #! Providers of libraries should only activate the components they need.
 
+## Access to `.git/index` files.
+index = ["dep:gix-index"]
+
 ## Access to credential helpers, which provide credentials for URLs.
 # Note that `gix-negotiate` just piggibacks here, as 'credentials' is equivalent to 'fetch & push' right now.
 credentials = ["dep:gix-credentials", "dep:gix-prompt", "dep:gix-negotiate"]
@@ -69,7 +72,7 @@ credentials = ["dep:gix-credentials", "dep:gix-prompt", "dep:gix-negotiate"]
 worktree-mutation = ["attributes", "dep:gix-worktree-state"]
 
 ## Retrieve a worktree stack for querying exclude information
-excludes = ["dep:gix-ignore", "dep:gix-worktree"]
+excludes = ["dep:gix-ignore", "dep:gix-worktree", "index"]
 
 ## Query attributes and excludes. Enables access to pathspecs, worktree checkouts, filter-pipelines and submodules.
 attributes = ["excludes", "dep:gix-filter", "dep:gix-pathspec", "dep:gix-attributes", "dep:gix-submodule", "gix-worktree?/attributes"]
@@ -78,7 +81,7 @@ attributes = ["excludes", "dep:gix-filter", "dep:gix-pathspec", "dep:gix-attribu
 mailmap = ["dep:gix-mailmap"]
 
 ## Make revspec parsing possible, as well describing revision.
-revision = ["gix-revision/describe"]
+revision = ["gix-revision/describe", "index"]
 
 ## If enabled, revspecs now support the regex syntax like `@^{/^.*x}`. Otherwise, only substring search is supported.
 ## This feature does increase compile time for niche-benefit, but is required for fully git-compatible revspec parsing.
@@ -165,7 +168,7 @@ serde = [   "dep:serde",
     "gix-transport?/serde",
     "gix-ref/serde",
     "gix-odb/serde",
-    "gix-index/serde",
+    "gix-index?/serde",
     "gix-mailmap?/serde",
     "gix-url/serde",
     "gix-attributes?/serde",
@@ -218,7 +221,7 @@ gix-trace = { version = "^0.1.3", path = "../gix-trace" }
 gix-glob = { version = "^0.11.0", path = "../gix-glob" }
 gix-credentials = { version = "^0.18.0", path = "../gix-credentials", optional = true }
 gix-prompt = { version = "^0.6.0", path = "../gix-prompt", optional = true }
-gix-index = { version = "^0.23.1", path = "../gix-index" }
+gix-index = { version = "^0.23.1", path = "../gix-index", optional = true }
 gix-attributes = { version = "^0.17.0", path = "../gix-attributes", optional = true }
 gix-ignore = { version = "^0.6.0", path = "../gix-ignore", optional = true }
 gix-worktree = { version = "^0.25.0", path = "../gix-worktree", optional = true, default-features = false }

gix/src/lib.rs

@@ -97,6 +97,7 @@ pub use gix_hashtable as hashtable;
 #[cfg(feature = "excludes")]
 pub use gix_ignore as ignore;
 #[doc(inline)]
+#[cfg(feature = "index")]
 pub use gix_index as index;
 pub use gix_lock as lock;
 #[cfg(feature = "credentials")]

gix/src/open/repository.rs

@@ -292,6 +292,7 @@ impl ThreadSafeRepository {
             config,
             // used when spawning new repositories off this one when following worktrees
             linked_worktree_options: options,
+            #[cfg(feature = "index")]
             index: gix_fs::SharedFileSnapshotMut::new().into(),
             shallow_commits: gix_fs::SharedFileSnapshotMut::new().into(),
             #[cfg(feature = "attributes")]

gix/src/repository/impls.rs

@@ -7,6 +7,7 @@ impl Clone for crate::Repository {
             self.common_dir.clone(),
             self.config.clone(),
             self.options.clone(),
+            #[cfg(feature = "index")]
             self.index.clone(),
             self.shallow_commits.clone(),
             #[cfg(feature = "attributes")]
@@ -42,6 +43,7 @@ impl From<&crate::ThreadSafeRepository> for crate::Repository {
             repo.common_dir.clone(),
             repo.config.clone(),
             repo.linked_worktree_options.clone(),
+            #[cfg(feature = "index")]
             repo.index.clone(),
             repo.shallow_commits.clone(),
             #[cfg(feature = "attributes")]
@@ -59,6 +61,7 @@ impl From<crate::ThreadSafeRepository> for crate::Repository {
             repo.common_dir,
             repo.config,
             repo.linked_worktree_options,
+            #[cfg(feature = "index")]
             repo.index,
             repo.shallow_commits,
             #[cfg(feature = "attributes")]
@@ -76,6 +79,7 @@ impl From<crate::Repository> for crate::ThreadSafeRepository {
             common_dir: r.common_dir,
             config: r.config,
             linked_worktree_options: r.options,
+            #[cfg(feature = "index")]
             index: r.index,
             #[cfg(feature = "attributes")]
             modules: r.modules,

gix/src/repository/init.rs

@@ -9,7 +9,7 @@ impl crate::Repository {
         common_dir: Option<std::path::PathBuf>,
         config: crate::config::Cache,
         linked_worktree_options: crate::open::Options,
-        index: crate::worktree::IndexStorage,
+        #[cfg(feature = "index")] index: crate::worktree::IndexStorage,
         shallow_commits: crate::shallow::CommitsStorage,
         #[cfg(feature = "attributes")] modules: crate::submodule::ModulesFileStorage,
     ) -> Self {
@@ -22,6 +22,7 @@ impl crate::Repository {
             refs,
             config,
             options: linked_worktree_options,
+            #[cfg(feature = "index")]
             index,
             shallow_commits,
             #[cfg(feature = "attributes")]

gix/src/repository/mod.rs

@@ -45,6 +45,7 @@ pub mod filter;
 mod graph;
 pub(crate) mod identity;
 mod impls;
+#[cfg(feature = "index")]
 mod index;
 pub(crate) mod init;
 mod kind;
@@ -66,6 +67,7 @@ mod thread_safe;
 mod worktree;
 
 /// A type to represent an index which either was loaded from disk as it was persisted there, or created on the fly in memory.
+#[cfg(feature = "index")]
 pub enum IndexPersistedOrInMemory {
     /// The index as loaded from disk, and shared across clones of the owning `Repository`.
     Persisted(crate::worktree::Index),
@@ -90,6 +92,7 @@ pub mod pathspec_defaults_ignore_case {
 }
 
 ///
+#[cfg(feature = "index")]
 pub mod index_or_load_from_head {
     /// The error returned by [`Repository::index_or_load_from_head()`][crate::Repository::index_or_load_from_head()].
     #[derive(thiserror::Error, Debug)]

gix/src/types.rs

@@ -138,6 +138,7 @@ pub struct Repository {
     ///
     /// Particularly useful when following linked worktrees and instantiating new equally configured worktree repositories.
     pub(crate) options: crate::open::Options,
+    #[cfg(feature = "index")]
     pub(crate) index: crate::worktree::IndexStorage,
     #[cfg(feature = "attributes")]
     pub(crate) modules: crate::submodule::ModulesFileStorage,
@@ -167,6 +168,7 @@ pub struct ThreadSafeRepository {
     /// options obtained when instantiating this repository for use when following linked worktrees.
     pub(crate) linked_worktree_options: crate::open::Options,
     /// The index of this instances worktree.
+    #[cfg(feature = "index")]
     pub(crate) index: crate::worktree::IndexStorage,
     #[cfg(feature = "attributes")]
     pub(crate) modules: crate::submodule::ModulesFileStorage,

gix/src/worktree/mod.rs

@@ -14,8 +14,10 @@ use crate::{
     Repository,
 };
 
+#[cfg(feature = "index")]
 pub(crate) type IndexStorage = gix_features::threading::OwnShared<gix_fs::SharedFileSnapshotMut<gix_index::File>>;
 /// A lazily loaded and auto-updated worktree index.
+#[cfg(feature = "index")]
 pub type Index = gix_fs::SharedFileSnapshot<gix_index::File>;
 
 /// A stand-in to a worktree as result of a worktree iteration.
@@ -84,6 +86,7 @@ pub(crate) fn id(git_dir: &std::path::Path, has_common_dir: bool) -> Option<&BSt
 pub mod proxy;
 
 ///
+#[cfg(feature = "index")]
 pub mod open_index {
     /// The error returned by [`Worktree::open_index()`][crate::Worktree::open_index()].
     #[derive(Debug, thiserror::Error)]

gix/tests/repository/worktree.rs

@@ -34,9 +34,8 @@ fn archive() -> crate::Result {
 mod with_core_worktree_config {
     use std::io::BufRead;
 
-    use crate::repository::worktree::Baseline;
-
     #[test]
+    #[cfg(feature = "index")]
     fn relative() -> crate::Result {
         for (name, is_relative) in [("absolute-worktree", false), ("relative-worktree", true)] {
             let repo = repo(name);
@@ -61,7 +60,7 @@ mod with_core_worktree_config {
                 "current worktree is based on work-tree dir"
             );
 
-            let baseline = Baseline::collect(repo.git_dir())?;
+            let baseline = crate::repository::worktree::Baseline::collect(repo.git_dir())?;
             assert_eq!(baseline.len(), 1, "git lists the main worktree");
             assert_eq!(
                 baseline[0].root,

justfile

@@ -126,6 +126,7 @@ check:
     cargo check -p gix --no-default-features --features attributes --tests
     cargo check -p gix --no-default-features --features worktree-mutation --tests
     cargo check -p gix --no-default-features --features credentials --tests
+    cargo check -p gix --no-default-features --features index --tests
     cargo check -p gix --no-default-features
     cargo check -p gix-odb --features serde
     cargo check --no-default-features --features max-control