feat: stabilize lockfile v4

src/cargo/core/resolver/encode.rs

@@ -154,18 +154,11 @@ impl EncodableResolve {
     /// primary uses is to be used with `resolve_with_previous` to guide the
     /// resolver to create a complete Resolve.
     pub fn into_resolve(self, original: &str, ws: &Workspace<'_>) -> CargoResult<Resolve> {
-        let unstable_lockfile_version_allowed = ws.config().cli_unstable().next_lockfile_bump;
         let path_deps = build_path_deps(ws)?;
         let mut checksums = HashMap::new();
 
         let mut version = match self.version {
-            Some(4) if ws.config().nightly_features_allowed => {
-                if unstable_lockfile_version_allowed {
-                    ResolveVersion::V4
-                } else {
-                    anyhow::bail!("lock file version 4 requires `-Znext-lockfile-bump`");
-                }
-            }
+            Some(4) => ResolveVersion::V4,
             Some(3) => ResolveVersion::V3,
             Some(n) => bail!(
                 "lock file version `{}` was found, but this version of Cargo \
@@ -797,9 +790,10 @@ fn encodable_source_id(id: SourceId, version: ResolveVersion) -> Option<Encodabl
     if id.is_path() {
         None
     } else {
+        use ResolveVersion::*;
         Some(match version {
-            ResolveVersion::V4 => EncodableSourceId::new(id),
-            _ => EncodableSourceId::without_url_encoded(id),
+            V4 => EncodableSourceId::new(id),
+            V1 | V2 | V3 => EncodableSourceId::without_url_encoded(id),
         })
     }
 }

src/cargo/core/resolver/resolve.rs

@@ -80,11 +80,9 @@ pub enum ResolveVersion {
     /// V3 by default staring in 1.53.
     #[default]
     V3,
-    /// Unstable. Will collect a certain amount of changes and then go.
-    ///
-    /// Changes made:
-    ///
-    /// * SourceId URL serialization is aware of URL encoding.
+    /// SourceId URL serialization is aware of URL encoding. For example,
+    /// `?branch=foo bar` is now encoded as `?branch=foo+bar` and can be decoded
+    /// back and forth correctly. Introduced in 2023 in version 1.75.
     V4,
 }
 

src/cargo/core/source_id.rs

@@ -618,10 +618,7 @@ impl fmt::Display for SourceId {
                 // Don't replace the URL display for git references,
                 // because those are kind of expected to be URLs.
                 write!(f, "{}", self.inner.url)?;
-                // TODO(-Znext-lockfile-bump): set it to true when stabilizing
-                // lockfile v4, because we want Source ID serialization to be
-                // consistent with lockfile.
-                if let Some(pretty) = reference.pretty_ref(false) {
+                if let Some(pretty) = reference.pretty_ref(true) {
                     write!(f, "?{}", pretty)?;
                 }
 

src/cargo/ops/lockfile.rs

@@ -67,7 +67,7 @@ pub fn write_pkg_lockfile(ws: &Workspace<'_>, resolve: &mut Resolve) -> CargoRes
     if resolve.version() < ResolveVersion::default() {
         resolve.set_version(ResolveVersion::default());
         out = serialize_resolve(resolve, orig.as_deref());
-    } else if resolve.version() > ResolveVersion::default()
+    } else if resolve.version() > ResolveVersion::V4
         && !ws.config().cli_unstable().next_lockfile_bump
     {
         // The next version hasn't yet stabilized.

src/cargo/sources/git/source.rs

@@ -167,11 +167,7 @@ fn ident_shallow(id: &SourceId, is_shallow: bool) -> String {
 impl<'cfg> Debug for GitSource<'cfg> {
     fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
         write!(f, "git repo at {}", self.remote.url())?;
-
-        // TODO(-Znext-lockfile-bump): set it to true when stabilizing
-        // lockfile v4, because we want Source ID serialization to be
-        // consistent with lockfile.
-        match self.manifest_reference.pretty_ref(false) {
+        match self.manifest_reference.pretty_ref(true) {
             Some(s) => write!(f, " ({})", s),
             None => Ok(()),
         }

src/cargo/util/toml_mut/dependency.rs

@@ -881,11 +881,7 @@ impl GitSource {
 impl std::fmt::Display for GitSource {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         let git_ref = self.git_ref();
-
-        // TODO(-Znext-lockfile-bump): set it to true when stabilizing
-        // lockfile v4, because we want Source ID serialization to be
-        // consistent with lockfile.
-        if let Some(pretty_ref) = git_ref.pretty_ref(false) {
+        if let Some(pretty_ref) = git_ref.pretty_ref(true) {
             write!(f, "{}?{}", self.git, pretty_ref)
         } else {
             write!(f, "{}", self.git)

tests/testsuite/lockfile_compat.rs

@@ -889,51 +889,6 @@ perhaps a crate was updated and forgotten to be re-vendored?
         .run();
 }
 
-#[cargo_test]
-fn v4_is_unstable() {
-    let p = project()
-        .file(
-            "Cargo.toml",
-            &format!(
-                r#"
-                    [package]
-                    name = "foo"
-                    version = "0.0.1"
-                "#,
-            ),
-        )
-        .file("src/lib.rs", "")
-        .file("Cargo.lock", "version = 4")
-        .build();
-
-    p.cargo("fetch")
-        .with_status(101)
-        .with_stderr(
-            "\
-error: failed to parse lock file at: [CWD]/Cargo.lock
-
-Caused by:
-  lock file version `4` was found, but this version of Cargo does not \
-  understand this lock file, perhaps Cargo needs to be updated?
-",
-        )
-        .run();
-
-    // On nightly, let the user know about the `-Z` flag.
-    p.cargo("fetch")
-        .masquerade_as_nightly_cargo(&["-Znext-lockfile-bump"])
-        .with_status(101)
-        .with_stderr(
-            "\
-error: failed to parse lock file at: [CWD]/Cargo.lock
-
-Caused by:
-  lock file version 4 requires `-Znext-lockfile-bump`
-",
-        )
-        .run();
-}
-
 #[cargo_test]
 fn v4_cannot_be_created_from_scratch() {
     let p = project()
@@ -950,9 +905,7 @@ fn v4_cannot_be_created_from_scratch() {
         .file("src/lib.rs", "")
         .build();
 
-    p.cargo("fetch -Znext-lockfile-bump")
-        .masquerade_as_nightly_cargo(&["-Znext-lockfile-bump"])
-        .run();
+    p.cargo("fetch").run();
 
     let lockfile = r#"# This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
@@ -993,6 +946,7 @@ fn v3_and_git_url_encoded(ref_kind: &str, f: impl FnOnce(&git2::Repository, &str
     let head_id = repo.head().unwrap().target().unwrap();
     // Ref name with special characters
     let git_ref = "a-_+#$)";
+    let encoded_ref = "a-_%2B%23%24%29";
     f(&repo, git_ref, head_id);
 
     let lockfile = format!(
@@ -1036,7 +990,7 @@ dependencies = [
         .with_stderr(format!(
             "\
 [UPDATING] git repository `{url}`
-[CHECKING] dep1 v0.5.0 ({url}?{ref_kind}={git_ref}#[..])
+[CHECKING] dep1 v0.5.0 ({url}?{ref_kind}={encoded_ref}#[..])
 [CHECKING] foo v0.0.1 ([CWD])
 [FINISHED] dev [..]
 "
@@ -1124,12 +1078,11 @@ dependencies = [
         .file("Cargo.lock", "version = 4")
         .build();
 
-    p.cargo("check -Znext-lockfile-bump")
-        .masquerade_as_nightly_cargo(&["-Znext-lockfile-bump"])
+    p.cargo("check")
         .with_stderr(format!(
             "\
 [UPDATING] git repository `{url}`
-[CHECKING] dep1 v0.5.0 ({url}?{ref_kind}={git_ref}#[..])
+[CHECKING] dep1 v0.5.0 ({url}?{ref_kind}={encoded_ref}#[..])
 [CHECKING] foo v0.0.1 ([CWD])
 [FINISHED] dev [..]
 "
@@ -1141,10 +1094,7 @@ dependencies = [
 
     // Unlike v3_and_git_url_encoded, v4 encodes URL parameters so no git
     // repository re-clone happen.
-    p.cargo("check -Znext-lockfile-bump")
-        .masquerade_as_nightly_cargo(&["-Znext-lockfile-bump"])
-        .with_stderr("[FINISHED] dev [..]")
-        .run();
+    p.cargo("check").with_stderr("[FINISHED] dev [..]").run();
 }
 
 #[cargo_test]