fix(new): Don't ignore Cargo.lock for all package types

Following the default guidance to commit a lockfile, this updates
`cargo new` to do it by default.

src/cargo/ops/cargo_new.rs

@@ -93,7 +93,6 @@ struct MkOptions<'a> {
     path: &'a Path,
     name: &'a str,
     source_files: Vec<SourceFileInformation>,
-    bin: bool,
     edition: Option<&'a str>,
     registry: Option<&'a str>,
 }
@@ -448,7 +447,6 @@ pub fn new(opts: &NewOptions, config: &Config) -> CargoResult<()> {
         path,
         name,
         source_files: vec![plan_new_source_file(opts.kind.is_bin(), name.to_string())],
-        bin: is_bin,
         edition: opts.edition.as_deref(),
         registry: opts.registry.as_deref(),
     };
@@ -553,7 +551,6 @@ pub fn init(opts: &NewOptions, config: &Config) -> CargoResult<NewProjectKind> {
         version_control,
         path,
         name,
-        bin: has_bin,
         source_files: src_paths_types,
         edition: opts.edition.as_deref(),
         registry: opts.registry.as_deref(),
@@ -745,9 +742,6 @@ fn mk(config: &Config, opts: &MkOptions<'_>) -> CargoResult<()> {
     // for all mutually-incompatible VCS in terms of syntax are in sync.
     let mut ignore = IgnoreList::new();
     ignore.push("/target", "^target$", "target");
-    if !opts.bin {
-        ignore.push("/Cargo.lock", "^Cargo.lock$", "Cargo.lock");
-    }
 
     let vcs = opts.version_control.unwrap_or_else(|| {
         let in_existing_vcs = existing_vcs_repo(path.parent().unwrap_or(path), config.cwd());

src/doc/src/faq.md

@@ -104,7 +104,8 @@ issue][cargo-issues].
 
 ### Why have `Cargo.lock` in version control?
 
-Whether you do is dependent on the needs of your package.
+While [`cargo new`] defaults to tracking `Cargo.lock` in version control,
+whether you do is dependent on the needs of your package.
 
 The purpose of a `Cargo.lock` lockfile is to describe the state of the world at
 the time of a successful build.
@@ -139,6 +140,7 @@ The lockfile can also be a source of merge conflicts.
 For strategies to verify newer versions of dependencies via CI,
 see [Verifying Latest Dependencies](guide/continuous-integration.md#verifying-latest-dependencies).
 
+[`cargo new`]: commands/cargo-new.md
 [`cargo add`]: commands/cargo-add.md
 [`cargo install`]: commands/cargo-install.md
 

tests/testsuite/init/auto_git/out/.gitignore

@@ -1,2 +1 @@
 /target
-/Cargo.lock

tests/testsuite/init/fossil_autodetect/out/.fossil-settings/clean-glob

@@ -1,2 +1 @@
 target
-Cargo.lock

tests/testsuite/init/fossil_autodetect/out/.fossil-settings/ignore-glob

@@ -1,2 +1 @@
 target
-Cargo.lock

tests/testsuite/init/git_autodetect/out/.gitignore

@@ -1,2 +1 @@
 /target
-/Cargo.lock

tests/testsuite/init/git_ignore_exists_no_conflicting_entries/out/.gitignore

@@ -3,4 +3,3 @@
 # Added by cargo
 
 /target
-/Cargo.lock

tests/testsuite/init/inferred_lib_with_git/out/.gitignore

@@ -1,2 +1 @@
 /target
-/Cargo.lock

tests/testsuite/init/mercurial_autodetect/out/.hgignore

@@ -1,2 +1 @@
 ^target$
-^Cargo.lock$

tests/testsuite/init/pijul_autodetect/out/.ignore

@@ -1,2 +1 @@
 /target
-/Cargo.lock

tests/testsuite/init/simple_git/out/.gitignore

@@ -1,2 +1 @@
 /target
-/Cargo.lock

tests/testsuite/init/simple_git_ignore_exists/out/.gitignore

@@ -6,4 +6,3 @@
 # already existing elements were commented out
 
 #/target
-/Cargo.lock

tests/testsuite/init/simple_hg/out/.hgignore

@@ -1,2 +1 @@
 ^target$
-^Cargo.lock$

tests/testsuite/init/simple_hg_ignore_exists/out/.hgignore

@@ -3,4 +3,3 @@
 # Added by cargo
 
 ^target$
-^Cargo.lock$

tests/testsuite/new.rs

@@ -95,7 +95,7 @@ fn simple_git() {
 
     let fp = paths::root().join("foo/.gitignore");
     let contents = fs::read_to_string(&fp).unwrap();
-    assert_eq!(contents, "/target\n/Cargo.lock\n",);
+    assert_eq!(contents, "/target\n",);
 
     cargo_process("build").cwd(&paths::root().join("foo")).run();
 }
@@ -112,7 +112,7 @@ fn simple_hg() {
 
     let fp = paths::root().join("foo/.hgignore");
     let contents = fs::read_to_string(&fp).unwrap();
-    assert_eq!(contents, "^target$\n^Cargo.lock$\n",);
+    assert_eq!(contents, "^target$\n",);
 
     cargo_process("build").cwd(&paths::root().join("foo")).run();
 }